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VBoxDnD.cpp

Last change on this file was 98103, checked in by vboxsync, 16 months ago
Copyright year updates by scm.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 63.0 KB

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1	/* $Id: VBoxDnD.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* VBoxDnD.cpp - Windows-specific bits of the drag and drop service.
4	*/
5
6	/*
7	* Copyright (C) 2013-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_GUEST_DND
33	#include <VBox/log.h>
34
35	#include <iprt/win/windows.h>
36	#include "VBoxTray.h"
37	#include "VBoxHelpers.h"
38	#include "VBoxDnD.h"
39
40	#include <VBox/VBoxGuestLib.h>
41	#include "VBox/HostServices/DragAndDropSvc.h"
42
43	using namespace DragAndDropSvc;
44
45	#include <iprt/asm.h>
46	#include <iprt/assert.h>
47	#include <iprt/ldr.h>
48	#include <iprt/list.h>
49	#include <iprt/mem.h>
50
51	#include <iprt/cpp/mtlist.h>
52	#include <iprt/cpp/ministring.h>
53
54	#include <iprt/cpp/mtlist.h>
55
56	#include <VBox/err.h>
57	#include <VBox/version.h>
58
59
60	/*********************************************************************************************************************************
61	* Defined Constants And Macros *
62	*********************************************************************************************************************************/
63	/** The drag and drop window's window class. */
64	#define VBOX_DND_WND_CLASS "VBoxTrayDnDWnd"
65
66	/** @todo Merge this with messages from VBoxTray.h. */
67	#define WM_VBOXTRAY_DND_MESSAGE WM_APP + 401
68
69	/** The notification header text for hlpShowBalloonTip(). */
70	#define VBOX_DND_SHOWBALLOON_HEADER VBOX_PRODUCT " Drag'n Drop"
71
72
73	/*********************************************************************************************************************************
74	* Structures and Typedefs *
75	*********************************************************************************************************************************/
76	/** Function pointer for SendInput(). This only is available starting
77	* at NT4 SP3+. */
78	typedef BOOL (WINAPI *PFNSENDINPUT)(UINT, LPINPUT, int);
79	typedef BOOL (WINAPI* PFNENUMDISPLAYMONITORS)(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
80
81
82	/*********************************************************************************************************************************
83	* Global Variables *
84	*********************************************************************************************************************************/
85	/** Static pointer to SendInput() function. */
86	static PFNSENDINPUT g_pfnSendInput = NULL;
87	static PFNENUMDISPLAYMONITORS g_pfnEnumDisplayMonitors = NULL;
88
89	static VBOXDNDCONTEXT g_Ctx = { 0 };
90
91
92	/*********************************************************************************************************************************
93	* Internal Functions *
94	*********************************************************************************************************************************/
95	static LRESULT CALLBACK vboxDnDWndProcInstance(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) RT_NOTHROW_PROTO;
96	static LRESULT CALLBACK vboxDnDWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) RT_NOTHROW_PROTO;
97
98
99
100
101	VBoxDnDWnd::VBoxDnDWnd(void)
102	: m_hThread(NIL_RTTHREAD),
103	m_EvtSem(NIL_RTSEMEVENT),
104	m_hWnd(NULL),
105	m_lstActionsAllowed(VBOX_DND_ACTION_IGNORE),
106	m_fMouseButtonDown(false),
107	#ifdef VBOX_WITH_DRAG_AND_DROP_GH
108	m_pDropTarget(NULL),
109	#endif
110	m_enmMode(Unknown),
111	m_enmState(Uninitialized)
112	{
113	RT_ZERO(m_startupInfo);
114
115	LogFlowFunc(("Supported formats:\n"));
116	const RTCString arrEntries[] = { VBOX_DND_FORMATS_DEFAULT };
117	for (size_t i = 0; i < RT_ELEMENTS(arrEntries); i++)
118	{
119	LogFlowFunc(("\t%s\n", arrEntries[i].c_str()));
120	this->m_lstFmtSup.append(arrEntries[i]);
121	}
122	}
123
124	VBoxDnDWnd::~VBoxDnDWnd(void)
125	{
126	Destroy();
127	}
128
129	/**
130	* Initializes the proxy window with a given DnD context.
131	*
132	* @return IPRT status code.
133	* @param a_pCtx Pointer to context to use.
134	*/
135	int VBoxDnDWnd::Initialize(PVBOXDNDCONTEXT a_pCtx)
136	{
137	AssertPtrReturn(a_pCtx, VERR_INVALID_POINTER);
138
139	/* Save the context. */
140	this->m_pCtx = a_pCtx;
141
142	int rc = RTSemEventCreate(&m_EvtSem);
143	if (RT_SUCCESS(rc))
144	rc = RTCritSectInit(&m_CritSect);
145
146	if (RT_SUCCESS(rc))
147	{
148	/* Message pump thread for our proxy window. */
149	rc = RTThreadCreate(&m_hThread, VBoxDnDWnd::Thread, this,
150	0, RTTHREADTYPE_MSG_PUMP, RTTHREADFLAGS_WAITABLE,
151	"dndwnd"); /** @todo Include ID if there's more than one proxy window. */
152	if (RT_SUCCESS(rc))
153	{
154	int rc2 = RTThreadUserWait(m_hThread, 30 * 1000 /* Timeout in ms */);
155	AssertRC(rc2);
156
157	if (!a_pCtx->fStarted) /* Did the thread fail to start? */
158	rc = VERR_NOT_SUPPORTED; /* Report back DnD as not being supported. */
159	}
160	}
161
162	if (RT_FAILURE(rc))
163	LogRel(("DnD: Failed to initialize proxy window, rc=%Rrc\n", rc));
164
165	LogFlowThisFunc(("Returning rc=%Rrc\n", rc));
166	return rc;
167	}
168
169	/**
170	* Destroys the proxy window and releases all remaining
171	* resources again.
172	*/
173	void VBoxDnDWnd::Destroy(void)
174	{
175	if (m_hThread != NIL_RTTHREAD)
176	{
177	int rcThread = VERR_WRONG_ORDER;
178	int rc = RTThreadWait(m_hThread, 60 * 1000 /* Timeout in ms */, &rcThread);
179	LogFlowFunc(("Waiting for thread resulted in %Rrc (thread exited with %Rrc)\n",
180	rc, rcThread));
181	NOREF(rc);
182	}
183
184	Reset();
185
186	RTCritSectDelete(&m_CritSect);
187	if (m_EvtSem != NIL_RTSEMEVENT)
188	{
189	RTSemEventDestroy(m_EvtSem);
190	m_EvtSem = NIL_RTSEMEVENT;
191	}
192
193	if (m_pCtx->wndClass != 0)
194	{
195	UnregisterClass(VBOX_DND_WND_CLASS, m_pCtx->pEnv->hInstance);
196	m_pCtx->wndClass = 0;
197	}
198
199	LogFlowFuncLeave();
200	}
201
202	/**
203	* Thread for handling the window's message pump.
204	*
205	* @return IPRT status code.
206	* @param hThread Handle to this thread.
207	* @param pvUser Pointer to VBoxDnDWnd instance which
208	* is using the thread.
209	*/
210	/static/ DECLCALLBACK(int) VBoxDnDWnd::Thread(RTTHREAD hThread, void *pvUser)
211	{
212	AssertPtrReturn(pvUser, VERR_INVALID_POINTER);
213
214	LogFlowFuncEnter();
215
216	VBoxDnDWnd pThis = (VBoxDnDWnd)pvUser;
217	AssertPtr(pThis);
218
219	PVBOXDNDCONTEXT m_pCtx = pThis->m_pCtx;
220	AssertPtr(m_pCtx);
221	AssertPtr(m_pCtx->pEnv);
222
223	int rc = VINF_SUCCESS;
224
225	AssertPtr(m_pCtx->pEnv);
226	HINSTANCE hInstance = m_pCtx->pEnv->hInstance;
227	Assert(hInstance != 0);
228
229	/* Create our proxy window. */
230	WNDCLASSEX wc = { 0 };
231	wc.cbSize = sizeof(WNDCLASSEX);
232
233	if (!GetClassInfoEx(hInstance, VBOX_DND_WND_CLASS, &wc))
234	{
235	wc.lpfnWndProc = vboxDnDWndProc;
236	wc.lpszClassName = VBOX_DND_WND_CLASS;
237	wc.hInstance = hInstance;
238	wc.style = CS_NOCLOSE;
239
240	if (g_cVerbosity)
241	{
242	/* Make it a solid red color so that we can see the window. */
243	wc.style \|= CS_HREDRAW \| CS_VREDRAW;
244	wc.hbrBackground = (HBRUSH)(CreateSolidBrush(RGB(255, 0, 0)));
245	}
246	else
247	wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1);
248
249	if (!RegisterClassEx(&wc))
250	{
251	DWORD dwErr = GetLastError();
252	LogFlowFunc(("Unable to register proxy window class, error=%ld\n", dwErr));
253	rc = RTErrConvertFromWin32(dwErr);
254	}
255	}
256
257	if (RT_SUCCESS(rc))
258	{
259	DWORD dwExStyle = WS_EX_TOOLWINDOW \| WS_EX_NOACTIVATE;
260	DWORD dwStyle = WS_POPUP;
261	if (g_cVerbosity)
262	{
263	dwStyle \|= WS_VISIBLE;
264	}
265	else
266	dwExStyle \|= WS_EX_TRANSPARENT;
267
268	pThis->m_hWnd = CreateWindowEx(dwExStyle,
269	VBOX_DND_WND_CLASS, VBOX_DND_WND_CLASS,
270	dwStyle,
271	-200, -200, 100, 100, NULL, NULL,
272	hInstance, pThis /* lParm */);
273	if (!pThis->m_hWnd)
274	{
275	DWORD dwErr = GetLastError();
276	LogFlowFunc(("Unable to create proxy window, error=%ld\n", dwErr));
277	rc = RTErrConvertFromWin32(dwErr);
278	}
279	else
280	{
281	BOOL fRc = SetWindowPos(pThis->m_hWnd, HWND_TOPMOST, -200, -200, 0, 0,
282	SWP_NOACTIVATE \| SWP_HIDEWINDOW
283	\| SWP_NOCOPYBITS \| SWP_NOREDRAW \| SWP_NOSIZE);
284	AssertMsg(fRc, ("Unable to set window position, error=%ld\n", GetLastError()));
285
286	LogFlowFunc(("Proxy window created, hWnd=0x%x\n", pThis->m_hWnd));
287
288	if (g_cVerbosity)
289	{
290	/*
291	* Install some mouse tracking.
292	*/
293	TRACKMOUSEEVENT me;
294	RT_ZERO(me);
295	me.cbSize = sizeof(TRACKMOUSEEVENT);
296	me.dwFlags = TME_HOVER \| TME_LEAVE \| TME_NONCLIENT;
297	me.hwndTrack = pThis->m_hWnd;
298
299	fRc = TrackMouseEvent(&me);
300	AssertMsg(fRc, ("Unable to enable debug mouse tracking, error=%ld\n", GetLastError()));
301	}
302	}
303	}
304
305	HRESULT hr = OleInitialize(NULL);
306	if (SUCCEEDED(hr))
307	{
308	#ifdef VBOX_WITH_DRAG_AND_DROP_GH
309	rc = pThis->RegisterAsDropTarget();
310	#endif
311	}
312	else
313	{
314	LogRel(("DnD: Unable to initialize OLE, hr=%Rhrc\n", hr));
315	rc = VERR_COM_UNEXPECTED;
316	}
317
318	if (RT_SUCCESS(rc))
319	m_pCtx->fStarted = true; /* Set started indicator on success. */
320
321	int rc2 = RTThreadUserSignal(hThread);
322	bool fSignalled = RT_SUCCESS(rc2);
323
324	if (RT_SUCCESS(rc))
325	{
326	bool fShutdown = false;
327	for (;;)
328	{
329	MSG uMsg;
330	BOOL fRet;
331	while ((fRet = GetMessage(&uMsg, 0, 0, 0)) > 0)
332	{
333	TranslateMessage(&uMsg);
334	DispatchMessage(&uMsg);
335	}
336	Assert(fRet >= 0);
337
338	if (ASMAtomicReadBool(&m_pCtx->fShutdown))
339	fShutdown = true;
340
341	if (fShutdown)
342	{
343	LogFlowFunc(("Closing proxy window ...\n"));
344	break;
345	}
346
347	/** @todo Immediately drop on failure? */
348	}
349
350	#ifdef VBOX_WITH_DRAG_AND_DROP_GH
351	rc2 = pThis->UnregisterAsDropTarget();
352	if (RT_SUCCESS(rc))
353	rc = rc2;
354	#endif
355	OleUninitialize();
356	}
357
358	if (!fSignalled)
359	{
360	rc2 = RTThreadUserSignal(hThread);
361	AssertRC(rc2);
362	}
363
364	LogFlowFuncLeaveRC(rc);
365	return rc;
366	}
367
368	/**
369	* Monitor enumeration callback for building up a simple bounding
370	* box, capable of holding all enumerated monitors.
371	*
372	* @return BOOL TRUE if enumeration should continue,
373	* FALSE if not.
374	* @param hMonitor Handle to current monitor being enumerated.
375	* @param hdcMonitor The current monitor's DC (device context).
376	* @param lprcMonitor The current monitor's RECT.
377	* @param lParam Pointer to a RECT structure holding the
378	* bounding box to build.
379	*/
380	/* static */
381	BOOL CALLBACK VBoxDnDWnd::MonitorEnumProc(HMONITOR hMonitor, HDC hdcMonitor, LPRECT lprcMonitor, LPARAM lParam)
382	{
383	RT_NOREF(hMonitor, hdcMonitor);
384	LPRECT pRect = (LPRECT)lParam;
385	AssertPtrReturn(pRect, FALSE);
386
387	AssertPtr(lprcMonitor);
388	LogFlowFunc(("Monitor is %ld,%ld,%ld,%ld\n",
389	lprcMonitor->left, lprcMonitor->top,
390	lprcMonitor->right, lprcMonitor->bottom));
391
392	/* Build up a simple bounding box to hold the entire (virtual) screen. */
393	if (pRect->left > lprcMonitor->left)
394	pRect->left = lprcMonitor->left;
395	if (pRect->right < lprcMonitor->right)
396	pRect->right = lprcMonitor->right;
397	if (pRect->top > lprcMonitor->top)
398	pRect->top = lprcMonitor->top;
399	if (pRect->bottom < lprcMonitor->bottom)
400	pRect->bottom = lprcMonitor->bottom;
401
402	return TRUE;
403	}
404
405	/**
406	* The proxy window's WndProc.
407	*/
408	LRESULT CALLBACK VBoxDnDWnd::WndProc(HWND a_hWnd, UINT a_uMsg, WPARAM a_wParam, LPARAM a_lParam)
409	{
410	switch (a_uMsg)
411	{
412	case WM_CREATE:
413	{
414	int rc = OnCreate();
415	if (RT_FAILURE(rc))
416	{
417	LogRel(("DnD: Failed to create proxy window, rc=%Rrc\n", rc));
418	return -1;
419	}
420	return 0;
421	}
422
423	case WM_QUIT:
424	{
425	LogFlowThisFunc(("WM_QUIT\n"));
426	PostQuitMessage(0);
427	return 0;
428	}
429
430	case WM_DESTROY:
431	{
432	LogFlowThisFunc(("WM_DESTROY\n"));
433
434	OnDestroy();
435	return 0;
436	}
437
438	case WM_LBUTTONDOWN:
439	{
440	LogFlowThisFunc(("WM_LBUTTONDOWN\n"));
441	m_fMouseButtonDown = true;
442	return 0;
443	}
444
445	case WM_LBUTTONUP:
446	{
447	LogFlowThisFunc(("WM_LBUTTONUP\n"));
448	m_fMouseButtonDown = false;
449
450	/* As the mouse button was released, Hide the proxy window again.
451	* This can happen if
452	* - the user bumped a guest window to the screen's edges
453	* - there was no drop data from the guest available and the user
454	* enters the guest screen again after this unsuccessful operation */
455	Reset();
456	return 0;
457	}
458
459	case WM_MOUSELEAVE:
460	{
461	LogFlowThisFunc(("WM_MOUSELEAVE\n"));
462	return 0;
463	}
464
465	/* Will only be called once; after the first mouse move, this
466	* window will be hidden! */
467	case WM_MOUSEMOVE:
468	{
469	LogFlowThisFunc(("WM_MOUSEMOVE: mfMouseButtonDown=%RTbool, mMode=%ld, mState=%ld\n",
470	m_fMouseButtonDown, m_enmMode, m_enmState));
471	#ifdef DEBUG_andy
472	POINT p;
473	GetCursorPos(&p);
474	LogFlowThisFunc(("WM_MOUSEMOVE: curX=%ld, curY=%ld\n", p.x, p.y));
475	#endif
476	int rc = VINF_SUCCESS;
477	if (m_enmMode == HG) /* Host to guest. */
478	{
479	/* Dragging not started yet? Kick it off ... */
480	if ( m_fMouseButtonDown
481	&& (m_enmState != Dragging))
482	{
483	m_enmState = Dragging;
484	#if 0
485	/* Delay hiding the proxy window a bit when debugging, to see
486	* whether the desired range is covered correctly. */
487	RTThreadSleep(5000);
488	#endif
489	Hide();
490
491	LogFlowThisFunc(("Starting drag and drop: dndLstActionsAllowed=0x%x, dwOKEffects=0x%x ...\n",
492	m_lstActionsAllowed, m_startupInfo.dwOKEffects));
493
494	AssertPtr(m_startupInfo.pDataObject);
495	AssertPtr(m_startupInfo.pDropSource);
496	DWORD dwEffect;
497	HRESULT hr = DoDragDrop(m_startupInfo.pDataObject, m_startupInfo.pDropSource,
498	m_startupInfo.dwOKEffects, &dwEffect);
499	LogFlowThisFunc(("hr=%Rhrc, dwEffect=%RI32\n", hr, dwEffect));
500	switch (hr)
501	{
502	case DRAGDROP_S_DROP:
503	m_enmState = Dropped;
504	break;
505
506	case DRAGDROP_S_CANCEL:
507	m_enmState = Canceled;
508	break;
509
510	default:
511	LogFlowThisFunc(("Drag and drop failed with %Rhrc\n", hr));
512	m_enmState = Canceled;
513	rc = VERR_GENERAL_FAILURE; /** @todo Find a better status code. */
514	break;
515	}
516
517	int rc2 = RTCritSectEnter(&m_CritSect);
518	if (RT_SUCCESS(rc2))
519	{
520	m_startupInfo.pDropSource->Release();
521	m_startupInfo.pDataObject->Release();
522
523	RT_ZERO(m_startupInfo);
524
525	rc2 = RTCritSectLeave(&m_CritSect);
526	if (RT_SUCCESS(rc))
527	rc = rc2;
528	}
529
530	m_enmMode = Unknown;
531	}
532	}
533	else if (m_enmMode == GH) /* Guest to host. */
534	{
535	/* Starting here VBoxDnDDropTarget should
536	* take over; was instantiated when registering
537	* this proxy window as a (valid) drop target. */
538	}
539	else
540	rc = VERR_NOT_SUPPORTED;
541
542	LogFlowThisFunc(("WM_MOUSEMOVE: mMode=%ld, mState=%ld, rc=%Rrc\n",
543	m_enmMode, m_enmState, rc));
544	return 0;
545	}
546
547	case WM_NCMOUSEHOVER:
548	LogFlowThisFunc(("WM_NCMOUSEHOVER\n"));
549	return 0;
550
551	case WM_NCMOUSELEAVE:
552	LogFlowThisFunc(("WM_NCMOUSELEAVE\n"));
553	return 0;
554
555	case WM_VBOXTRAY_DND_MESSAGE:
556	{
557	PVBOXDNDEVENT pEvent = (PVBOXDNDEVENT)a_lParam;
558	if (!pEvent)
559	break; /* No event received, bail out. */
560
561	PVBGLR3DNDEVENT pVbglR3Event = pEvent->pVbglR3Event;
562	AssertPtrBreak(pVbglR3Event);
563
564	LogFlowThisFunc(("Received enmType=%RU32\n", pVbglR3Event->enmType));
565
566	int rc;
567	switch (pVbglR3Event->enmType)
568	{
569	case VBGLR3DNDEVENTTYPE_HG_ENTER:
570	{
571	if (pVbglR3Event->u.HG_Enter.cbFormats)
572	{
573	RTCList<RTCString> lstFormats =
574	RTCString(pVbglR3Event->u.HG_Enter.pszFormats, pVbglR3Event->u.HG_Enter.cbFormats - 1).split(DND_FORMATS_SEPARATOR_STR);
575	rc = OnHgEnter(lstFormats, pVbglR3Event->u.HG_Enter.dndLstActionsAllowed);
576	if (RT_FAILURE(rc))
577	break;
578	}
579	else
580	{
581	AssertMsgFailed(("cbFormats is 0\n"));
582	rc = VERR_INVALID_PARAMETER;
583	break;
584	}
585
586	/* Note: After HOST_DND_FN_HG_EVT_ENTER there immediately is a move
587	* event, so fall through is intentional here. */
588	RT_FALL_THROUGH();
589	}
590
591	case VBGLR3DNDEVENTTYPE_HG_MOVE:
592	{
593	rc = OnHgMove(pVbglR3Event->u.HG_Move.uXpos, pVbglR3Event->u.HG_Move.uYpos,
594	pVbglR3Event->u.HG_Move.dndActionDefault);
595	break;
596	}
597
598	case VBGLR3DNDEVENTTYPE_HG_LEAVE:
599	{
600	rc = OnHgLeave();
601	break;
602	}
603
604	case VBGLR3DNDEVENTTYPE_HG_DROP:
605	{
606	rc = OnHgDrop();
607	break;
608	}
609
610	/**
611	* The data header now will contain all the (meta) data the guest needs in
612	* order to complete the DnD operation.
613	*/
614	case VBGLR3DNDEVENTTYPE_HG_RECEIVE:
615	{
616	rc = OnHgDataReceive(&pVbglR3Event->u.HG_Received.Meta);
617	break;
618	}
619
620	case VBGLR3DNDEVENTTYPE_CANCEL:
621	{
622	rc = OnHgCancel();
623	break;
624	}
625
626	case VBGLR3DNDEVENTTYPE_QUIT:
627	{
628	LogRel(("DnD: Received quit message, shutting down ...\n"));
629	PostQuitMessage(0);
630	}
631
632	#ifdef VBOX_WITH_DRAG_AND_DROP_GH
633	case VBGLR3DNDEVENTTYPE_GH_ERROR:
634	{
635	Reset();
636	rc = VINF_SUCCESS;
637	break;
638	}
639
640	case VBGLR3DNDEVENTTYPE_GH_REQ_PENDING:
641	{
642	rc = OnGhIsDnDPending();
643	break;
644	}
645
646	case VBGLR3DNDEVENTTYPE_GH_DROP:
647	{
648	rc = OnGhDrop(pVbglR3Event->u.GH_Drop.pszFormat, pVbglR3Event->u.GH_Drop.dndActionRequested);
649	break;
650	}
651	#endif
652	default:
653	{
654	LogRel(("DnD: Received unsupported message '%RU32'\n", pVbglR3Event->enmType));
655	rc = VERR_NOT_SUPPORTED;
656	break;
657	}
658	}
659
660	LogFlowFunc(("Message %RU32 processed with %Rrc\n", pVbglR3Event->enmType, rc));
661	if (RT_FAILURE(rc))
662	{
663	/* Tell the user. */
664	LogRel(("DnD: Processing message %RU32 failed with %Rrc\n", pVbglR3Event->enmType, rc));
665
666	/* If anything went wrong, do a reset and start over. */
667	Reset();
668	}
669
670	if (pEvent)
671	{
672	VbglR3DnDEventFree(pEvent->pVbglR3Event);
673	pEvent->pVbglR3Event = NULL;
674
675	RTMemFree(pEvent);
676	}
677
678	return 0;
679	}
680
681	default:
682	break;
683	}
684
685	return DefWindowProc(a_hWnd, a_uMsg, a_wParam, a_lParam);
686	}
687
688	#ifdef VBOX_WITH_DRAG_AND_DROP_GH
689
690	/**
691	* Registers this proxy window as a local drop target.
692	*
693	* @return IPRT status code.
694	*/
695	int VBoxDnDWnd::RegisterAsDropTarget(void)
696	{
697	if (m_pDropTarget) /* Already registered as drop target? */
698	return VINF_SUCCESS;
699
700	# ifdef RT_EXCEPTIONS_ENABLED
701	try { m_pDropTarget = new VBoxDnDDropTarget(this /* pParent */); }
702	catch (std::bad_alloc &)
703	# else
704	m_pDropTarget = new VBoxDnDDropTarget(this /* pParent */);
705	if (!m_pDropTarget)
706	# endif
707	{
708	LogFunc(("VERR_NO_MEMORY!\n"));
709	return VERR_NO_MEMORY;
710	}
711
712	HRESULT hrc = CoLockObjectExternal(m_pDropTarget, TRUE /* fLock /, FALSE / fLastUnlockReleases */);
713	if (SUCCEEDED(hrc))
714	{
715	hrc = RegisterDragDrop(m_hWnd, m_pDropTarget);
716	if (SUCCEEDED(hrc))
717	{
718	LogFlowFuncLeaveRC(VINF_SUCCESS);
719	return VINF_SUCCESS;
720	}
721	}
722	if (hrc != DRAGDROP_E_INVALIDHWND) /* Could be because the DnD host service is not available. */
723	LogRel(("DnD: Creating drop target failed with hr=%Rhrc\n", hrc));
724	LogFlowFuncLeaveRC(VERR_NOT_SUPPORTED);
725	return VERR_NOT_SUPPORTED; /* Report back DnD as not being supported. */
726	}
727
728	/**
729	* Unregisters this proxy as a drop target.
730	*
731	* @return IPRT status code.
732	*/
733	int VBoxDnDWnd::UnregisterAsDropTarget(void)
734	{
735	LogFlowFuncEnter();
736
737	if (!m_pDropTarget) /* No drop target? Bail out. */
738	return VINF_SUCCESS;
739
740	HRESULT hr = RevokeDragDrop(m_hWnd);
741	if (SUCCEEDED(hr))
742	hr = CoLockObjectExternal(m_pDropTarget, FALSE /* fLock */,
743	TRUE /* fLastUnlockReleases */);
744	if (SUCCEEDED(hr))
745	{
746	ULONG cRefs = m_pDropTarget->Release();
747	Assert(cRefs == 0); NOREF(cRefs);
748	m_pDropTarget = NULL;
749	}
750
751	int rc = SUCCEEDED(hr)
752	? VINF_SUCCESS : VERR_GENERAL_FAILURE; /** @todo Fix this. */
753
754	LogFlowFuncLeaveRC(rc);
755	return rc;
756	}
757
758	#endif /* VBOX_WITH_DRAG_AND_DROP_GH */
759
760	/**
761	* Handles the creation of a proxy window.
762	*
763	* @return IPRT status code.
764	*/
765	int VBoxDnDWnd::OnCreate(void)
766	{
767	LogFlowFuncEnter();
768	int rc = VbglR3DnDConnect(&m_cmdCtx);
769	if (RT_FAILURE(rc))
770	{
771	LogRel(("DnD: Connection to host service failed, rc=%Rrc\n", rc));
772	return rc;
773	}
774
775	LogFlowThisFunc(("Client ID=%RU32, rc=%Rrc\n", m_cmdCtx.uClientID, rc));
776	return rc;
777	}
778
779	/**
780	* Handles the destruction of a proxy window.
781	*/
782	void VBoxDnDWnd::OnDestroy(void)
783	{
784	DestroyWindow(m_hWnd);
785
786	VbglR3DnDDisconnect(&m_cmdCtx);
787	LogFlowThisFuncLeave();
788	}
789
790	/**
791	* Aborts an in-flight DnD operation on the guest.
792	*
793	* @return VBox status code.
794	*/
795	int VBoxDnDWnd::Abort(void)
796	{
797	LogFlowThisFunc(("mMode=%ld, mState=%RU32\n", m_enmMode, m_enmState));
798	LogRel(("DnD: Drag and drop operation aborted\n"));
799
800	int rc = RTCritSectEnter(&m_CritSect);
801	if (RT_SUCCESS(rc))
802	{
803	if (m_startupInfo.pDataObject)
804	m_startupInfo.pDataObject->Abort();
805
806	RTCritSectLeave(&m_CritSect);
807	}
808
809	/* Post ESC to our window to officially abort the
810	* drag and drop operation. */
811	this->PostMessage(WM_KEYDOWN, VK_ESCAPE /* wParam /, 0 / lParam */);
812
813	Reset();
814
815	return rc;
816	}
817
818	/**
819	* Handles actions required when the host cursor enters
820	* the guest's screen to initiate a host -> guest DnD operation.
821	*
822	* @return IPRT status code.
823	* @param a_lstFormats Supported formats offered by the host.
824	* @param a_fDndLstActionsAllowed Supported actions offered by the host.
825	*/
826	int VBoxDnDWnd::OnHgEnter(const RTCList<RTCString> &a_lstFormats, VBOXDNDACTIONLIST a_fDndLstActionsAllowed)
827	{
828	if (m_enmMode == GH) /* Wrong mode? Bail out. */
829	return VERR_WRONG_ORDER;
830
831	#ifdef DEBUG
832	LogFlowThisFunc(("dndActionList=0x%x, a_lstFormats=%zu: ", a_fDndLstActionsAllowed, a_lstFormats.size()));
833	for (size_t i = 0; i < a_lstFormats.size(); i++)
834	LogFlow(("'%s' ", a_lstFormats.at(i).c_str()));
835	LogFlow(("\n"));
836	#endif
837
838	Reset();
839	setMode(HG);
840
841	/* Check if the VM session has changed and reconnect to the HGCM service if necessary. */
842	int rc = checkForSessionChange();
843	if (RT_FAILURE(rc))
844	return rc;
845
846	/* Save all allowed actions. */
847	this->m_lstActionsAllowed = a_fDndLstActionsAllowed;
848
849	/*
850	* Check if reported formats from host are compatible with this client.
851	*/
852	size_t cFormatsSup = this->m_lstFmtSup.size();
853	ULONG cFormatsActive = 0;
854
855	LPFORMATETC paFormatEtc = (LPFORMATETC)RTMemTmpAllocZ(sizeof(paFormatEtc[0]) * cFormatsSup);
856	AssertReturn(paFormatEtc, VERR_NO_TMP_MEMORY);
857
858	LPSTGMEDIUM paStgMeds = (LPSTGMEDIUM)RTMemTmpAllocZ(sizeof(paStgMeds[0]) * cFormatsSup);
859	AssertReturnStmt(paFormatEtc, RTMemTmpFree(paFormatEtc), VERR_NO_TMP_MEMORY);
860
861	LogRel2(("DnD: Reported formats:\n"));
862	for (size_t i = 0; i < a_lstFormats.size(); i++)
863	{
864	bool fSupported = false;
865	for (size_t a = 0; a < this->m_lstFmtSup.size(); a++)
866	{
867	const char *pszFormat = a_lstFormats.at(i).c_str();
868	LogFlowThisFunc(("\t\"%s\" <=> \"%s\"\n", this->m_lstFmtSup.at(a).c_str(), pszFormat));
869
870	fSupported = RTStrICmp(this->m_lstFmtSup.at(a).c_str(), pszFormat) == 0;
871	if (fSupported)
872	{
873	this->m_lstFmtActive.append(a_lstFormats.at(i));
874
875	/** @todo Put this into a \#define / struct. */
876	if (!RTStrICmp(pszFormat, "text/uri-list"))
877	{
878	paFormatEtc[cFormatsActive].cfFormat = CF_HDROP;
879	paFormatEtc[cFormatsActive].dwAspect = DVASPECT_CONTENT;
880	paFormatEtc[cFormatsActive].lindex = -1;
881	paFormatEtc[cFormatsActive].tymed = TYMED_HGLOBAL;
882
883	paStgMeds [cFormatsActive].tymed = TYMED_HGLOBAL;
884	cFormatsActive++;
885	}
886	else if ( !RTStrICmp(pszFormat, "text/plain")
887	\|\| !RTStrICmp(pszFormat, "text/html")
888	\|\| !RTStrICmp(pszFormat, "text/plain;charset=utf-8")
889	\|\| !RTStrICmp(pszFormat, "text/plain;charset=utf-16")
890	\|\| !RTStrICmp(pszFormat, "text/plain")
891	\|\| !RTStrICmp(pszFormat, "text/richtext")
892	\|\| !RTStrICmp(pszFormat, "UTF8_STRING")
893	\|\| !RTStrICmp(pszFormat, "TEXT")
894	\|\| !RTStrICmp(pszFormat, "STRING"))
895	{
896	paFormatEtc[cFormatsActive].cfFormat = CF_TEXT;
897	paFormatEtc[cFormatsActive].dwAspect = DVASPECT_CONTENT;
898	paFormatEtc[cFormatsActive].lindex = -1;
899	paFormatEtc[cFormatsActive].tymed = TYMED_HGLOBAL;
900
901	paStgMeds [cFormatsActive].tymed = TYMED_HGLOBAL;
902	cFormatsActive++;
903	}
904	else /* Should never happen. */
905	AssertReleaseMsgFailedBreak(("Format specification for '%s' not implemented\n", pszFormat));
906	break;
907	}
908	}
909
910	LogRel2(("DnD: \t%s: %RTbool\n", a_lstFormats.at(i).c_str(), fSupported));
911	}
912
913	if (g_cVerbosity)
914	{
915	RTCString strMsg("Enter: Host -> Guest\n");
916	strMsg += RTCStringFmt("Allowed actions: ");
917	char *pszActions = DnDActionListToStrA(a_fDndLstActionsAllowed);
918	AssertPtrReturn(pszActions, VERR_NO_STR_MEMORY);
919	strMsg += pszActions;
920	RTStrFree(pszActions);
921	strMsg += "\nFormats: ";
922	for (size_t i = 0; i < this->m_lstFmtActive.size(); i++)
923	{
924	if (i > 0)
925	strMsg += ", ";
926	strMsg += this->m_lstFmtActive[i];
927	}
928
929	hlpShowBalloonTip(g_hInstance, g_hwndToolWindow, ID_TRAYICON,
930	strMsg.c_str(), VBOX_DND_SHOWBALLOON_HEADER,
931	15 * 1000 /* Time to display in msec */, NIIF_INFO);
932	}
933
934	/*
935	* Warn in the log if this guest does not accept anything.
936	*/
937	Assert(cFormatsActive <= cFormatsSup);
938	if (cFormatsActive)
939	{
940	LogRel2(("DnD: %RU32 supported formats found:\n", cFormatsActive));
941	for (size_t i = 0; i < cFormatsActive; i++)
942	LogRel2(("DnD: \t%s\n", this->m_lstFmtActive.at(i).c_str()));
943	}
944	else
945	LogRel(("DnD: Warning: No supported drag and drop formats on the guest found!\n"));
946
947	/*
948	* Prepare the startup info for DoDragDrop().
949	*/
950
951	/* Translate our drop actions into allowed Windows drop effects. */
952	m_startupInfo.dwOKEffects = DROPEFFECT_NONE;
953	if (a_fDndLstActionsAllowed)
954	{
955	if (a_fDndLstActionsAllowed & VBOX_DND_ACTION_COPY)
956	m_startupInfo.dwOKEffects \|= DROPEFFECT_COPY;
957	if (a_fDndLstActionsAllowed & VBOX_DND_ACTION_MOVE)
958	m_startupInfo.dwOKEffects \|= DROPEFFECT_MOVE;
959	if (a_fDndLstActionsAllowed & VBOX_DND_ACTION_LINK)
960	m_startupInfo.dwOKEffects \|= DROPEFFECT_LINK;
961	}
962
963	LogRel2(("DnD: Supported drop actions: 0x%x\n", m_startupInfo.dwOKEffects));
964
965	#ifdef RT_EXCEPTIONS_ENABLED
966	try
967	{
968	m_startupInfo.pDropSource = new VBoxDnDDropSource(this);
969	m_startupInfo.pDataObject = new VBoxDnDDataObject(paFormatEtc, paStgMeds, cFormatsActive);
970	}
971	catch (std::bad_alloc &)
972	#else
973	m_startupInfo.pDropSource = new VBoxDnDDropSource(this);
974	m_startupInfo.pDataObject = new VBoxDnDDataObject(paFormatEtc, paStgMeds, cFormatsActive);
975	if (!m_startupInfo.pDropSource \|\| !m_startupInfo.pDataObject)
976	#endif
977	{
978	LogFunc(("VERR_NO_MEMORY!"));
979	rc = VERR_NO_MEMORY;
980	}
981
982	RTMemTmpFree(paFormatEtc);
983	RTMemTmpFree(paStgMeds);
984
985	if (RT_SUCCESS(rc))
986	rc = makeFullscreen();
987
988	LogFlowFuncLeaveRC(rc);
989	return rc;
990	}
991
992	/**
993	* Handles actions required when the host cursor moves inside
994	* the guest's screen.
995	*
996	* @return IPRT status code.
997	* @param u32xPos Absolute X position (in pixels) of the host cursor
998	* inside the guest.
999	* @param u32yPos Absolute Y position (in pixels) of the host cursor
1000	* inside the guest.
1001	* @param dndAction Action the host wants to perform while moving.
1002	* Currently ignored.
1003	*/
1004	int VBoxDnDWnd::OnHgMove(uint32_t u32xPos, uint32_t u32yPos, VBOXDNDACTION dndAction)
1005	{
1006	RT_NOREF(dndAction);
1007	int rc;
1008
1009	uint32_t uActionNotify = VBOX_DND_ACTION_IGNORE;
1010	if (m_enmMode == HG)
1011	{
1012	LogFlowThisFunc(("u32xPos=%RU32, u32yPos=%RU32, dndAction=0x%x\n",
1013	u32xPos, u32yPos, dndAction));
1014
1015	rc = mouseMove(u32xPos, u32yPos, MOUSEEVENTF_LEFTDOWN);
1016
1017	if (RT_SUCCESS(rc))
1018	rc = RTCritSectEnter(&m_CritSect);
1019	if (RT_SUCCESS(rc))
1020	{
1021	if ( (Dragging == m_enmState)
1022	&& m_startupInfo.pDropSource)
1023	uActionNotify = m_startupInfo.pDropSource->GetCurrentAction();
1024
1025	RTCritSectLeave(&m_CritSect);
1026	}
1027	}
1028	else /* Just acknowledge the operation with an ignore action. */
1029	rc = VINF_SUCCESS;
1030
1031	if (RT_SUCCESS(rc))
1032	{
1033	rc = VbglR3DnDHGSendAckOp(&m_cmdCtx, uActionNotify);
1034	if (RT_FAILURE(rc))
1035	LogFlowThisFunc(("Acknowledging operation failed with rc=%Rrc\n", rc));
1036	}
1037
1038	LogFlowThisFunc(("Returning uActionNotify=0x%x, rc=%Rrc\n", uActionNotify, rc));
1039	return rc;
1040	}
1041
1042	/**
1043	* Handles actions required when the host cursor leaves
1044	* the guest's screen again.
1045	*
1046	* @return IPRT status code.
1047	*/
1048	int VBoxDnDWnd::OnHgLeave(void)
1049	{
1050	if (m_enmMode == GH) /* Wrong mode? Bail out. */
1051	return VERR_WRONG_ORDER;
1052
1053	if (g_cVerbosity)
1054	hlpShowBalloonTip(g_hInstance, g_hwndToolWindow, ID_TRAYICON,
1055	"Leave: Host -> Guest", VBOX_DND_SHOWBALLOON_HEADER,
1056	15 * 1000 /* Time to display in msec */, NIIF_INFO);
1057
1058	int rc = Abort();
1059
1060	LogFlowFuncLeaveRC(rc);
1061	return rc;
1062	}
1063
1064	/**
1065	* Handles actions required when the host cursor wants to drop
1066	* and therefore start a "drop" action in the guest.
1067	*
1068	* @return IPRT status code.
1069	*/
1070	int VBoxDnDWnd::OnHgDrop(void)
1071	{
1072	if (m_enmMode == GH)
1073	return VERR_WRONG_ORDER;
1074
1075	LogFlowThisFunc(("mMode=%ld, mState=%RU32\n", m_enmMode, m_enmState));
1076
1077	int rc = VINF_SUCCESS;
1078	if (m_enmState == Dragging)
1079	{
1080	if (g_cVerbosity)
1081	hlpShowBalloonTip(g_hInstance, g_hwndToolWindow, ID_TRAYICON,
1082	"Drop: Host -> Guest", VBOX_DND_SHOWBALLOON_HEADER,
1083	15 * 1000 /* Time to display in msec */, NIIF_INFO);
1084
1085	if (m_lstFmtActive.size() >= 1)
1086	{
1087	/** @todo What to do when multiple formats are available? */
1088	m_strFmtReq = m_lstFmtActive.at(0);
1089
1090	rc = RTCritSectEnter(&m_CritSect);
1091	if (RT_SUCCESS(rc))
1092	{
1093	if (m_startupInfo.pDataObject)
1094	m_startupInfo.pDataObject->SetStatus(VBoxDnDDataObject::Status_Dropping);
1095	else
1096	rc = VERR_NOT_FOUND;
1097
1098	RTCritSectLeave(&m_CritSect);
1099	}
1100
1101	if (RT_SUCCESS(rc))
1102	{
1103	LogRel(("DnD: Requesting data as '%s' ...\n", m_strFmtReq.c_str()));
1104	rc = VbglR3DnDHGSendReqData(&m_cmdCtx, m_strFmtReq.c_str());
1105	if (RT_FAILURE(rc))
1106	LogFlowThisFunc(("Requesting data failed with rc=%Rrc\n", rc));
1107	}
1108
1109	}
1110	else /* Should never happen. */
1111	LogRel(("DnD: Error: Host did not specify a data format for drop data\n"));
1112	}
1113
1114	LogFlowFuncLeaveRC(rc);
1115	return rc;
1116	}
1117
1118	/**
1119	* Handles actions required when the host has sent over DnD data
1120	* to the guest after a "drop" event.
1121	*
1122	* @return IPRT status code.
1123	* @param pMeta Pointer to meta data received.
1124	*/
1125	int VBoxDnDWnd::OnHgDataReceive(PVBGLR3GUESTDNDMETADATA pMeta)
1126	{
1127	LogFlowThisFunc(("mState=%ld, enmMetaType=%RU32\n", m_enmState, pMeta->enmType));
1128
1129	int rc = RTCritSectEnter(&m_CritSect);
1130	if (RT_SUCCESS(rc))
1131	{
1132	m_enmState = Dropped;
1133
1134	if (m_startupInfo.pDataObject)
1135	{
1136	switch (pMeta->enmType)
1137	{
1138	case VBGLR3GUESTDNDMETADATATYPE_RAW:
1139	{
1140	AssertBreakStmt(pMeta->u.Raw.pvMeta != NULL, rc = VERR_INVALID_POINTER);
1141	AssertBreakStmt(pMeta->u.Raw.cbMeta, rc = VERR_INVALID_PARAMETER);
1142
1143	rc = m_startupInfo.pDataObject->Signal(m_strFmtReq, pMeta->u.Raw.pvMeta, pMeta->u.Raw.cbMeta);
1144	break;
1145	}
1146
1147	case VBGLR3GUESTDNDMETADATATYPE_URI_LIST:
1148	{
1149	LogRel2(("DnD: URI transfer root directory is '%s'\n", DnDTransferListGetRootPathAbs(&pMeta->u.URI.Transfer)));
1150
1151	char *pszBuf;
1152	size_t cbBuf;
1153	/* Note: The transfer list already has its root set to a temporary directory, so no need to set/add a new
1154	* path base here. */
1155	rc = DnDTransferListGetRootsEx(&pMeta->u.URI.Transfer, DNDTRANSFERLISTFMT_NATIVE, NULL /* pszPathBase */,
1156	DND_PATH_SEPARATOR_STR, &pszBuf, &cbBuf);
1157	if (RT_SUCCESS(rc))
1158	{
1159	rc = m_startupInfo.pDataObject->Signal(m_strFmtReq, pszBuf, cbBuf);
1160	RTStrFree(pszBuf);
1161	}
1162	break;
1163	}
1164
1165	default:
1166	AssertFailedStmt(rc = VERR_NOT_IMPLEMENTED);
1167	break;
1168	}
1169	}
1170	else
1171	rc = VERR_NOT_FOUND;
1172
1173	int rc2 = mouseRelease();
1174	if (RT_SUCCESS(rc))
1175	rc = rc2;
1176
1177	RTCritSectLeave(&m_CritSect);
1178	}
1179
1180	LogFlowFuncLeaveRC(rc);
1181	return rc;
1182	}
1183
1184	/**
1185	* Handles actions required when the host wants to cancel the current
1186	* host -> guest operation.
1187	*
1188	* @return IPRT status code.
1189	*/
1190	int VBoxDnDWnd::OnHgCancel(void)
1191	{
1192	return Abort();
1193	}
1194
1195	#ifdef VBOX_WITH_DRAG_AND_DROP_GH
1196	/**
1197	* Handles actions required to start a guest -> host DnD operation.
1198	* This works by letting the host ask whether a DnD operation is pending
1199	* on the guest. The guest must not know anything about the host's DnD state
1200	* and/or operations due to security reasons.
1201	*
1202	* To capture a pending DnD operation on the guest which then can be communicated
1203	* to the host the proxy window needs to be registered as a drop target. This drop
1204	* target then will act as a proxy target between the guest OS and the host. In other
1205	* words, the guest OS will use this proxy target as a regular (invisible) window
1206	* which can be used by the regular guest OS' DnD mechanisms, independently of the
1207	* host OS. To make sure this proxy target is able receive an in-progress DnD operation
1208	* on the guest, it will be shown invisibly across all active guest OS screens. Just
1209	* think of an opened umbrella across all screens here.
1210	*
1211	* As soon as the proxy target and its underlying data object receive appropriate
1212	* DnD messages they'll be hidden again, and the control will be transferred back
1213	* this class again.
1214	*
1215	* @return IPRT status code.
1216	*/
1217	int VBoxDnDWnd::OnGhIsDnDPending(void)
1218	{
1219	LogFlowThisFunc(("mMode=%ld, mState=%ld\n", m_enmMode, m_enmState));
1220
1221	if (m_enmMode == Unknown)
1222	setMode(GH);
1223
1224	if (m_enmMode != GH)
1225	return VERR_WRONG_ORDER;
1226
1227	if (m_enmState == Uninitialized)
1228	{
1229	/* Nothing to do here yet. */
1230	m_enmState = Initialized;
1231	}
1232
1233	int rc;
1234	if (m_enmState == Initialized)
1235	{
1236	/* Check if the VM session has changed and reconnect to the HGCM service if necessary. */
1237	rc = checkForSessionChange();
1238	if (RT_SUCCESS(rc))
1239	{
1240	rc = makeFullscreen();
1241	if (RT_SUCCESS(rc))
1242	{
1243	/*
1244	* We have to release the left mouse button to
1245	* get into our (invisible) proxy window.
1246	*/
1247	mouseRelease();
1248
1249	/*
1250	* Even if we just released the left mouse button
1251	* we're still in the dragging state to handle our
1252	* own drop target (for the host).
1253	*/
1254	m_enmState = Dragging;
1255	}
1256	}
1257	}
1258	else
1259	rc = VINF_SUCCESS;
1260
1261	/**
1262	* Some notes regarding guest cursor movement:
1263	* - The host only sends an HOST_DND_FN_GH_REQ_PENDING message to the guest
1264	* if the mouse cursor is outside the VM's window.
1265	* - The guest does not know anything about the host's cursor
1266	* position / state due to security reasons.
1267	* - The guest only knows that the host currently is asking whether a
1268	* guest DnD operation is in progress.
1269	*/
1270
1271	if ( RT_SUCCESS(rc)
1272	&& m_enmState == Dragging)
1273	{
1274	/** @todo Put this block into a function! */
1275	POINT p;
1276	GetCursorPos(&p);
1277	ClientToScreen(m_hWnd, &p);
1278	#ifdef DEBUG_andy
1279	LogFlowThisFunc(("Client to screen curX=%ld, curY=%ld\n", p.x, p.y));
1280	#endif
1281
1282	/** @todo Multi-monitor setups? */
1283	#if 0 /* unused */
1284	int iScreenX = GetSystemMetrics(SM_CXSCREEN) - 1;
1285	int iScreenY = GetSystemMetrics(SM_CYSCREEN) - 1;
1286	#endif
1287
1288	LONG px = p.x;
1289	if (px <= 0)
1290	px = 1;
1291	LONG py = p.y;
1292	if (py <= 0)
1293	py = 1;
1294
1295	rc = mouseMove(px, py, 0 /* dwMouseInputFlags */);
1296	}
1297
1298	if (RT_SUCCESS(rc))
1299	{
1300	VBOXDNDACTION dndActionDefault = VBOX_DND_ACTION_IGNORE;
1301
1302	AssertPtr(m_pDropTarget);
1303	RTCString strFormats = m_pDropTarget->Formats();
1304	if (!strFormats.isEmpty())
1305	{
1306	dndActionDefault = VBOX_DND_ACTION_COPY;
1307
1308	LogFlowFunc(("Acknowledging pDropTarget=0x%p, dndActionDefault=0x%x, dndLstActionsAllowed=0x%x, strFormats=%s\n",
1309	m_pDropTarget, dndActionDefault, m_lstActionsAllowed, strFormats.c_str()));
1310	}
1311	else
1312	{
1313	strFormats = "unknown"; /* Prevent VERR_IO_GEN_FAILURE for IOCTL. */
1314	LogFlowFunc(("No format data from proxy window available yet\n"));
1315	}
1316
1317	/** @todo Support more than one action at a time. */
1318	m_lstActionsAllowed = dndActionDefault;
1319
1320	int rc2 = VbglR3DnDGHSendAckPending(&m_cmdCtx,
1321	dndActionDefault, m_lstActionsAllowed,
1322	strFormats.c_str(), (uint32_t)strFormats.length() + 1 /* Include termination */);
1323	if (RT_FAILURE(rc2))
1324	{
1325	char szMsg[256]; /* Sizes according to MSDN. */
1326	char szTitle[64];
1327
1328	/** @todo Add some i18l tr() macros here. */
1329	RTStrPrintf(szTitle, sizeof(szTitle), "VirtualBox Guest Additions Drag and Drop");
1330	RTStrPrintf(szMsg, sizeof(szMsg), "Drag and drop to the host either is not supported or disabled. "
1331	"Please enable Guest to Host or Bidirectional drag and drop mode "
1332	"or re-install the VirtualBox Guest Additions.");
1333	switch (rc2)
1334	{
1335	case VERR_ACCESS_DENIED:
1336	{
1337	rc = hlpShowBalloonTip(g_hInstance, g_hwndToolWindow, ID_TRAYICON,
1338	szMsg, szTitle,
1339	15 * 1000 /* Time to display in msec */, NIIF_INFO);
1340	AssertRC(rc);
1341	break;
1342	}
1343
1344	default:
1345	break;
1346	}
1347
1348	LogRel2(("DnD: Host refuses drag and drop operation from guest: %Rrc\n", rc2));
1349	Reset();
1350	}
1351	}
1352
1353	if (RT_FAILURE(rc))
1354	Reset(); /* Reset state on failure. */
1355
1356	LogFlowFuncLeaveRC(rc);
1357	return rc;
1358	}
1359
1360	/**
1361	* Handles actions required to let the guest know that the host
1362	* started a "drop" action on the host. This will tell the guest
1363	* to send data in a specific format the host requested.
1364	*
1365	* @return IPRT status code.
1366	* @param pszFormat Format the host requests the data in.
1367	* @param cbFormat Size (in bytes) of format string.
1368	* @param dndActionDefault Default action on the host.
1369	*/
1370	int VBoxDnDWnd::OnGhDrop(const RTCString &strFormat, uint32_t dndActionDefault)
1371	{
1372	LogFlowThisFunc(("mMode=%ld, mState=%ld, pDropTarget=0x%p, strFormat=%s, dndActionDefault=0x%x\n",
1373	m_enmMode, m_enmState, m_pDropTarget, strFormat.c_str(), dndActionDefault));
1374	int rc;
1375	if (m_enmMode == GH)
1376	{
1377	if (g_cVerbosity)
1378	{
1379	RTCString strMsg("Drop: Guest -> Host\n\n");
1380	strMsg += RTCStringFmt("Action: %#x\n", dndActionDefault);
1381	strMsg += RTCStringFmt("Format: %s\n", strFormat.c_str());
1382
1383	hlpShowBalloonTip(g_hInstance, g_hwndToolWindow, ID_TRAYICON,
1384	strMsg.c_str(), VBOX_DND_SHOWBALLOON_HEADER,
1385	15 * 1000 /* Time to display in msec */, NIIF_INFO);
1386	}
1387
1388	if (m_enmState == Dragging)
1389	{
1390	AssertPtr(m_pDropTarget);
1391	rc = m_pDropTarget->WaitForDrop(5 * 1000 /* 5s timeout */);
1392
1393	Reset();
1394	}
1395	else if (m_enmState == Dropped)
1396	{
1397	rc = VINF_SUCCESS;
1398	}
1399	else
1400	rc = VERR_WRONG_ORDER;
1401
1402	if (RT_SUCCESS(rc))
1403	{
1404	/** @todo Respect uDefAction. */
1405	void *pvData = m_pDropTarget->DataMutableRaw();
1406	uint32_t cbData = (uint32_t)m_pDropTarget->DataSize();
1407	Assert(cbData == m_pDropTarget->DataSize());
1408
1409	if ( pvData
1410	&& cbData)
1411	{
1412	rc = VbglR3DnDGHSendData(&m_cmdCtx, strFormat.c_str(), pvData, cbData);
1413	LogFlowFunc(("Sent pvData=0x%p, cbData=%RU32, rc=%Rrc\n", pvData, cbData, rc));
1414	}
1415	else
1416	rc = VERR_NO_DATA;
1417	}
1418	}
1419	else
1420	rc = VERR_WRONG_ORDER;
1421
1422	if (RT_FAILURE(rc))
1423	{
1424	/*
1425	* If an error occurred or the guest is in a wrong DnD mode,
1426	* send an error to the host in any case so that the host does
1427	* not wait for the data it expects from the guest.
1428	*/
1429	int rc2 = VbglR3DnDSendError(&m_cmdCtx, rc);
1430	AssertRC(rc2);
1431	}
1432
1433	LogFlowFuncLeaveRC(rc);
1434	return rc;
1435	}
1436	#endif /* VBOX_WITH_DRAG_AND_DROP_GH */
1437
1438	void VBoxDnDWnd::PostMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
1439	{
1440	LogFlowFunc(("Posting message %u\n"));
1441	BOOL fRc = ::PostMessage(m_hWnd, uMsg, wParam, lParam);
1442	Assert(fRc); NOREF(fRc);
1443	}
1444
1445	/**
1446	* Injects a DnD event in this proxy window's Windows
1447	* event queue. The (allocated) event will be deleted by
1448	* this class after processing.
1449	*
1450	* @return IPRT status code.
1451	* @param pEvent Event to inject.
1452	*/
1453	int VBoxDnDWnd::ProcessEvent(PVBOXDNDEVENT pEvent)
1454	{
1455	AssertPtrReturn(pEvent, VERR_INVALID_POINTER);
1456
1457	BOOL fRc = ::PostMessage(m_hWnd, WM_VBOXTRAY_DND_MESSAGE,
1458	0 /* wParm /, (LPARAM)pEvent / lParm */);
1459	if (!fRc)
1460	{
1461	DWORD dwErr = GetLastError();
1462
1463	static int s_iBitchedAboutFailedDnDMessages = 0;
1464	if (s_iBitchedAboutFailedDnDMessages++ < 32)
1465	{
1466	LogRel(("DnD: Processing event %p failed with %ld (%Rrc), skipping\n",
1467	pEvent, dwErr, RTErrConvertFromWin32(dwErr)));
1468	}
1469
1470	VbglR3DnDEventFree(pEvent->pVbglR3Event);
1471
1472	RTMemFree(pEvent);
1473	pEvent = NULL;
1474
1475	return RTErrConvertFromWin32(dwErr);
1476	}
1477
1478	return VINF_SUCCESS;
1479	}
1480
1481	/**
1482	* Checks if the VM session has changed (can happen when restoring the VM from a saved state)
1483	* and do a reconnect to the DnD HGCM service.
1484	*
1485	* @returns IPRT status code.
1486	*/
1487	int VBoxDnDWnd::checkForSessionChange(void)
1488	{
1489	uint64_t uSessionID;
1490	int rc = VbglR3GetSessionId(&uSessionID);
1491	if ( RT_SUCCESS(rc)
1492	&& uSessionID != m_cmdCtx.uSessionID)
1493	{
1494	LogFlowThisFunc(("VM session has changed to %RU64\n", uSessionID));
1495
1496	rc = VbglR3DnDDisconnect(&m_cmdCtx);
1497	AssertRC(rc);
1498
1499	rc = VbglR3DnDConnect(&m_cmdCtx);
1500	AssertRC(rc);
1501	}
1502
1503	LogFlowFuncLeaveRC(rc);
1504	return rc;
1505	}
1506
1507	/**
1508	* Hides the proxy window again.
1509	*
1510	* @return IPRT status code.
1511	*/
1512	int VBoxDnDWnd::Hide(void)
1513	{
1514	#ifdef DEBUG_andy
1515	LogFlowFunc(("\n"));
1516	#endif
1517	ShowWindow(m_hWnd, SW_HIDE);
1518
1519	return VINF_SUCCESS;
1520	}
1521
1522	/**
1523	* Shows the (invisible) proxy window in fullscreen,
1524	* spawned across all active guest monitors.
1525	*
1526	* @return IPRT status code.
1527	*/
1528	int VBoxDnDWnd::makeFullscreen(void)
1529	{
1530	int rc = VINF_SUCCESS;
1531
1532	RECT r;
1533	RT_ZERO(r);
1534
1535	BOOL fRc;
1536	HDC hDC = GetDC(NULL /* Entire screen */);
1537	if (hDC)
1538	{
1539	fRc = g_pfnEnumDisplayMonitors
1540	/* EnumDisplayMonitors is not available on NT4. */
1541	? g_pfnEnumDisplayMonitors(hDC, NULL, VBoxDnDWnd::MonitorEnumProc, (LPARAM)&r):
1542	FALSE;
1543
1544	if (!fRc)
1545	rc = VERR_NOT_FOUND;
1546	ReleaseDC(NULL, hDC);
1547	}
1548	else
1549	rc = VERR_ACCESS_DENIED;
1550
1551	if (RT_FAILURE(rc))
1552	{
1553	/* If multi-monitor enumeration failed above, try getting at least the
1554	* primary monitor as a fallback. */
1555	r.left = 0;
1556	r.top = 0;
1557	r.right = GetSystemMetrics(SM_CXSCREEN);
1558	r.bottom = GetSystemMetrics(SM_CYSCREEN);
1559
1560	rc = VINF_SUCCESS;
1561	}
1562
1563	if (RT_SUCCESS(rc))
1564	{
1565	LONG lStyle = GetWindowLong(m_hWnd, GWL_STYLE);
1566	SetWindowLong(m_hWnd, GWL_STYLE,
1567	lStyle & ~(WS_CAPTION \| WS_THICKFRAME));
1568	LONG lExStyle = GetWindowLong(m_hWnd, GWL_EXSTYLE);
1569	SetWindowLong(m_hWnd, GWL_EXSTYLE,
1570	lExStyle & ~( WS_EX_DLGMODALFRAME \| WS_EX_WINDOWEDGE
1571	\| WS_EX_CLIENTEDGE \| WS_EX_STATICEDGE));
1572
1573	fRc = SetWindowPos(m_hWnd, HWND_TOPMOST,
1574	r.left,
1575	r.top,
1576	r.right - r.left,
1577	r.bottom - r.top,
1578	g_cVerbosity
1579	? SWP_SHOWWINDOW \| SWP_FRAMECHANGED
1580	: SWP_SHOWWINDOW \| SWP_NOOWNERZORDER \| SWP_NOREDRAW \| SWP_NOACTIVATE);
1581	if (fRc)
1582	{
1583	LogFlowFunc(("Virtual screen is %ld,%ld,%ld,%ld (%ld x %ld)\n",
1584	r.left, r.top, r.right, r.bottom,
1585	r.right - r.left, r.bottom - r.top));
1586	}
1587	else
1588	{
1589	DWORD dwErr = GetLastError();
1590	LogRel(("DnD: Failed to set proxy window position, rc=%Rrc\n",
1591	RTErrConvertFromWin32(dwErr)));
1592	}
1593	}
1594	else
1595	LogRel(("DnD: Failed to determine virtual screen size, rc=%Rrc\n", rc));
1596
1597	LogFlowFuncLeaveRC(rc);
1598	return rc;
1599	}
1600
1601	/**
1602	* Moves the guest mouse cursor to a specific position.
1603	*
1604	* @return IPRT status code.
1605	* @param x X position (in pixels) to move cursor to.
1606	* @param y Y position (in pixels) to move cursor to.
1607	* @param dwMouseInputFlags Additional movement flags. @sa MOUSEEVENTF_ flags.
1608	*/
1609	int VBoxDnDWnd::mouseMove(int x, int y, DWORD dwMouseInputFlags)
1610	{
1611	int iScreenX = GetSystemMetrics(SM_CXSCREEN) - 1;
1612	int iScreenY = GetSystemMetrics(SM_CYSCREEN) - 1;
1613
1614	INPUT Input[1] = { {0} };
1615	Input[0].type = INPUT_MOUSE;
1616	Input[0].mi.dwFlags = MOUSEEVENTF_MOVE \| MOUSEEVENTF_ABSOLUTE
1617	\| dwMouseInputFlags;
1618	Input[0].mi.dx = x * (65535 / iScreenX);
1619	Input[0].mi.dy = y * (65535 / iScreenY);
1620
1621	int rc;
1622	if (g_pfnSendInput(1 /* Number of inputs */,
1623	Input, sizeof(INPUT)))
1624	{
1625	#ifdef DEBUG_andy
1626	CURSORINFO ci;
1627	RT_ZERO(ci);
1628	ci.cbSize = sizeof(ci);
1629	BOOL fRc = GetCursorInfo(&ci);
1630	if (fRc)
1631	LogFlowThisFunc(("Cursor shown=%RTbool, cursor=0x%p, x=%d, y=%d\n",
1632	(ci.flags & CURSOR_SHOWING) ? true : false,
1633	ci.hCursor, ci.ptScreenPos.x, ci.ptScreenPos.y));
1634	#endif
1635	rc = VINF_SUCCESS;
1636	}
1637	else
1638	{
1639	DWORD dwErr = GetLastError();
1640	rc = RTErrConvertFromWin32(dwErr);
1641	LogFlowFunc(("SendInput failed with rc=%Rrc\n", rc));
1642	}
1643
1644	return rc;
1645	}
1646
1647	/**
1648	* Releases a previously pressed left guest mouse button.
1649	*
1650	* @return IPRT status code.
1651	*/
1652	int VBoxDnDWnd::mouseRelease(void)
1653	{
1654	LogFlowFuncEnter();
1655
1656	int rc;
1657
1658	/* Release mouse button in the guest to start the "drop"
1659	* action at the current mouse cursor position. */
1660	INPUT Input[1] = { {0} };
1661	Input[0].type = INPUT_MOUSE;
1662	Input[0].mi.dwFlags = MOUSEEVENTF_LEFTUP;
1663	if (!g_pfnSendInput(1, Input, sizeof(INPUT)))
1664	{
1665	DWORD dwErr = GetLastError();
1666	rc = RTErrConvertFromWin32(dwErr);
1667	LogFlowFunc(("SendInput failed with rc=%Rrc\n", rc));
1668	}
1669	else
1670	rc = VINF_SUCCESS;
1671
1672	return rc;
1673	}
1674
1675	/**
1676	* Resets the proxy window.
1677	*/
1678	void VBoxDnDWnd::Reset(void)
1679	{
1680	LogFlowThisFunc(("Resetting, old mMode=%ld, mState=%ld\n",
1681	m_enmMode, m_enmState));
1682
1683	/*
1684	* Note: Don't clear this->lstAllowedFormats at the moment, as this value is initialized
1685	* on class creation. We might later want to modify the allowed formats at runtime,
1686	* so keep this in mind when implementing this.
1687	*/
1688
1689	this->m_lstFmtActive.clear();
1690	this->m_lstActionsAllowed = VBOX_DND_ACTION_IGNORE;
1691
1692	int rc2 = setMode(Unknown);
1693	AssertRC(rc2);
1694
1695	Hide();
1696	}
1697
1698	/**
1699	* Sets the current operation mode of this proxy window.
1700	*
1701	* @return IPRT status code.
1702	* @param enmMode New mode to set.
1703	*/
1704	int VBoxDnDWnd::setMode(Mode enmMode)
1705	{
1706	LogFlowThisFunc(("Old mode=%ld, new mode=%ld\n",
1707	m_enmMode, enmMode));
1708
1709	m_enmMode = enmMode;
1710	m_enmState = Initialized;
1711
1712	return VINF_SUCCESS;
1713	}
1714
1715	/**
1716	* Static helper function for having an own WndProc for proxy
1717	* window instances.
1718	*/
1719	static LRESULT CALLBACK vboxDnDWndProcInstance(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) RT_NOTHROW_DEF
1720	{
1721	LONG_PTR pUserData = GetWindowLongPtr(hWnd, GWLP_USERDATA);
1722	AssertPtrReturn(pUserData, 0);
1723
1724	VBoxDnDWnd pWnd = reinterpret_cast<VBoxDnDWnd >(pUserData);
1725	if (pWnd)
1726	return pWnd->WndProc(hWnd, uMsg, wParam, lParam);
1727
1728	return 0;
1729	}
1730
1731	/**
1732	* Static helper function for routing Windows messages to a specific
1733	* proxy window instance.
1734	*/
1735	static LRESULT CALLBACK vboxDnDWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) RT_NOTHROW_DEF
1736	{
1737	/* Note: WM_NCCREATE is not the first ever message which arrives, but
1738	* early enough for us. */
1739	if (uMsg == WM_NCCREATE)
1740	{
1741	LPCREATESTRUCT pCS = (LPCREATESTRUCT)lParam;
1742	AssertPtr(pCS);
1743	SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG_PTR)pCS->lpCreateParams);
1744	SetWindowLongPtr(hWnd, GWLP_WNDPROC, (LONG_PTR)vboxDnDWndProcInstance);
1745
1746	return vboxDnDWndProcInstance(hWnd, uMsg, wParam, lParam);
1747	}
1748
1749	/* No window associated yet. */
1750	return DefWindowProc(hWnd, uMsg, wParam, lParam);
1751	}
1752
1753	/**
1754	* Initializes drag and drop.
1755	*
1756	* @return IPRT status code.
1757	* @param pEnv The DnD service's environment.
1758	* @param ppInstance The instance pointer which refer to this object.
1759	*/
1760	DECLCALLBACK(int) VBoxDnDInit(const PVBOXSERVICEENV pEnv, void **ppInstance)
1761	{
1762	AssertPtrReturn(pEnv, VERR_INVALID_POINTER);
1763	AssertPtrReturn(ppInstance, VERR_INVALID_POINTER);
1764
1765	LogFlowFuncEnter();
1766
1767	PVBOXDNDCONTEXT pCtx = &g_Ctx; /* Only one instance at the moment. */
1768	AssertPtr(pCtx);
1769
1770	int rc;
1771	bool fSupportedOS = true;
1772
1773	if (VbglR3AutoLogonIsRemoteSession())
1774	{
1775	/* Do not do drag and drop for remote sessions. */
1776	LogRel(("DnD: Drag and drop has been disabled for a remote session\n"));
1777	rc = VERR_NOT_SUPPORTED;
1778	}
1779	else
1780	rc = VINF_SUCCESS;
1781
1782	if (RT_SUCCESS(rc))
1783	{
1784	g_pfnSendInput = (PFNSENDINPUT)
1785	RTLdrGetSystemSymbol("User32.dll", "SendInput");
1786	fSupportedOS = !RT_BOOL(g_pfnSendInput == NULL);
1787	g_pfnEnumDisplayMonitors = (PFNENUMDISPLAYMONITORS)
1788	RTLdrGetSystemSymbol("User32.dll", "EnumDisplayMonitors");
1789	/* g_pfnEnumDisplayMonitors is optional. */
1790
1791	if (!fSupportedOS)
1792	{
1793	LogRel(("DnD: Not supported Windows version, disabling drag and drop support\n"));
1794	rc = VERR_NOT_SUPPORTED;
1795	}
1796	}
1797
1798	if (RT_SUCCESS(rc))
1799	{
1800	/* Assign service environment to our context. */
1801	pCtx->pEnv = pEnv;
1802
1803	/* Create the proxy window. At the moment we
1804	* only support one window at a time. */
1805	VBoxDnDWnd *pWnd = NULL;
1806	#ifdef RT_EXCEPTIONS_ENABLED
1807	try { pWnd = new VBoxDnDWnd(); }
1808	catch (std::bad_alloc &)
1809	#else
1810	pWnd = new VBoxDnDWnd();
1811	if (!pWnd)
1812	#endif
1813	{
1814	rc = VERR_NO_MEMORY;
1815	}
1816	if (RT_SUCCESS(rc))
1817	{
1818	rc = pWnd->Initialize(pCtx);
1819	if (RT_SUCCESS(rc))
1820	{
1821	/* Add proxy window to our proxy windows list. */
1822	#ifdef RT_EXCEPTIONS_ENABLED
1823	try { pCtx->lstWnd.append(pWnd); /** @todo the list implementation sucks wrt exception handling. */ }
1824	catch (std::bad_alloc &)
1825	{
1826	delete pWnd;
1827	rc = VERR_NO_MEMORY;
1828	}
1829	#else
1830	pCtx->lstWnd.append(pWnd); /** @todo the list implementation sucks wrt exception handling. */
1831	#endif
1832	}
1833	else
1834	delete pWnd;
1835	}
1836	}
1837
1838	if (RT_SUCCESS(rc))
1839	rc = RTSemEventCreate(&pCtx->hEvtQueueSem);
1840	if (RT_SUCCESS(rc))
1841	{
1842	*ppInstance = pCtx;
1843
1844	LogRel(("DnD: Drag and drop service successfully started\n"));
1845	}
1846	else
1847	LogRel(("DnD: Initializing drag and drop service failed with rc=%Rrc\n", rc));
1848
1849	LogFlowFuncLeaveRC(rc);
1850	return rc;
1851	}
1852
1853	DECLCALLBACK(int) VBoxDnDStop(void *pInstance)
1854	{
1855	AssertPtrReturn(pInstance, VERR_INVALID_POINTER);
1856
1857	LogFunc(("Stopping pInstance=%p\n", pInstance));
1858
1859	PVBOXDNDCONTEXT pCtx = (PVBOXDNDCONTEXT)pInstance;
1860	AssertPtr(pCtx);
1861
1862	/* Set shutdown indicator. */
1863	ASMAtomicWriteBool(&pCtx->fShutdown, true);
1864
1865	/* Disconnect. */
1866	VbglR3DnDDisconnect(&pCtx->cmdCtx);
1867
1868	LogFlowFuncLeaveRC(VINF_SUCCESS);
1869	return VINF_SUCCESS;
1870	}
1871
1872	DECLCALLBACK(void) VBoxDnDDestroy(void *pInstance)
1873	{
1874	AssertPtrReturnVoid(pInstance);
1875
1876	LogFunc(("Destroying pInstance=%p\n", pInstance));
1877
1878	PVBOXDNDCONTEXT pCtx = (PVBOXDNDCONTEXT)pInstance;
1879	AssertPtr(pCtx);
1880
1881	/** @todo At the moment we only have one DnD proxy window. */
1882	Assert(pCtx->lstWnd.size() == 1);
1883	VBoxDnDWnd *pWnd = pCtx->lstWnd.first();
1884	if (pWnd)
1885	{
1886	delete pWnd;
1887	pWnd = NULL;
1888	}
1889
1890	if (pCtx->hEvtQueueSem != NIL_RTSEMEVENT)
1891	{
1892	RTSemEventDestroy(pCtx->hEvtQueueSem);
1893	pCtx->hEvtQueueSem = NIL_RTSEMEVENT;
1894	}
1895
1896	LogFunc(("Destroyed pInstance=%p\n", pInstance));
1897	}
1898
1899	DECLCALLBACK(int) VBoxDnDWorker(void pInstance, bool volatile pfShutdown)
1900	{
1901	AssertPtr(pInstance);
1902	AssertPtr(pfShutdown);
1903
1904	LogFlowFunc(("pInstance=%p\n", pInstance));
1905
1906	/*
1907	* Tell the control thread that it can continue
1908	* spawning services.
1909	*/
1910	RTThreadUserSignal(RTThreadSelf());
1911
1912	PVBOXDNDCONTEXT pCtx = (PVBOXDNDCONTEXT)pInstance;
1913	AssertPtr(pCtx);
1914
1915	int rc = VbglR3DnDConnect(&pCtx->cmdCtx);
1916	if (RT_FAILURE(rc))
1917	return rc;
1918
1919	if (g_cVerbosity)
1920	hlpShowBalloonTip(g_hInstance, g_hwndToolWindow, ID_TRAYICON,
1921	RTCStringFmt("Running (worker client ID %RU32)", pCtx->cmdCtx.uClientID).c_str(),
1922	VBOX_DND_SHOWBALLOON_HEADER,
1923	15 * 1000 /* Time to display in msec */, NIIF_INFO);
1924
1925	/** @todo At the moment we only have one DnD proxy window. */
1926	Assert(pCtx->lstWnd.size() == 1);
1927	VBoxDnDWnd *pWnd = pCtx->lstWnd.first();
1928	AssertPtr(pWnd);
1929
1930	/* Number of invalid messages skipped in a row. */
1931	int cMsgSkippedInvalid = 0;
1932	PVBOXDNDEVENT pEvent = NULL;
1933
1934	for (;;)
1935	{
1936	pEvent = (PVBOXDNDEVENT)RTMemAllocZ(sizeof(VBOXDNDEVENT));
1937	if (!pEvent)
1938	{
1939	rc = VERR_NO_MEMORY;
1940	break;
1941	}
1942	/* Note: pEvent will be free'd by the consumer later. */
1943
1944	PVBGLR3DNDEVENT pVbglR3Event = NULL;
1945	rc = VbglR3DnDEventGetNext(&pCtx->cmdCtx, &pVbglR3Event);
1946	if (RT_SUCCESS(rc))
1947	{
1948	LogFunc(("enmType=%RU32, rc=%Rrc\n", pVbglR3Event->enmType, rc));
1949
1950	cMsgSkippedInvalid = 0; /* Reset skipped messages count. */
1951
1952	LogRel2(("DnD: Received new event, type=%RU32, rc=%Rrc\n", pVbglR3Event->enmType, rc));
1953
1954	/* pEvent now owns pVbglR3Event. */
1955	pEvent->pVbglR3Event = pVbglR3Event;
1956	pVbglR3Event = NULL;
1957
1958	rc = pWnd->ProcessEvent(pEvent);
1959	if (RT_SUCCESS(rc))
1960	{
1961	/* Event was consumed and the proxy window till take care of the memory -- NULL it. */
1962	pEvent = NULL;
1963	}
1964	else
1965	LogRel(("DnD: Processing proxy window event %RU32 failed with %Rrc\n", pVbglR3Event->enmType, rc));
1966	}
1967
1968	if (RT_FAILURE(rc))
1969	{
1970	if (pEvent)
1971	{
1972	RTMemFree(pEvent);
1973	pEvent = NULL;
1974	}
1975
1976	LogFlowFunc(("Processing next message failed with rc=%Rrc\n", rc));
1977
1978	/* Old(er) hosts either are broken regarding DnD support or otherwise
1979	* don't support the stuff we do on the guest side, so make sure we
1980	* don't process invalid messages forever. */
1981	if (cMsgSkippedInvalid++ > 32)
1982	{
1983	LogRel(("DnD: Too many invalid/skipped messages from host, exiting ...\n"));
1984	break;
1985	}
1986
1987	/* Make sure our proxy window is hidden when an error occured to
1988	* not block the guest's UI. */
1989	int rc2 = pWnd->Abort();
1990	AssertRC(rc2);
1991	}
1992
1993	if (*pfShutdown)
1994	break;
1995
1996	if (ASMAtomicReadBool(&pCtx->fShutdown))
1997	break;
1998
1999	if (RT_FAILURE(rc)) /* Don't hog the CPU on errors. */
2000	RTThreadSleep(1000 /* ms */);
2001	}
2002
2003	if (pEvent)
2004	{
2005	VbglR3DnDEventFree(pEvent->pVbglR3Event);
2006
2007	RTMemFree(pEvent);
2008	pEvent = NULL;
2009	}
2010
2011	VbglR3DnDDisconnect(&pCtx->cmdCtx);
2012
2013	LogRel(("DnD: Ended\n"));
2014
2015	LogFlowFuncLeaveRC(rc);
2016	return rc;
2017	}
2018
2019	/**
2020	* The service description.
2021	*/
2022	VBOXSERVICEDESC g_SvcDescDnD =
2023	{
2024	/* pszName. */
2025	"draganddrop",
2026	/* pszDescription. */
2027	"Drag and Drop",
2028	/* methods */
2029	VBoxDnDInit,
2030	VBoxDnDWorker,
2031	VBoxDnDStop,
2032	VBoxDnDDestroy
2033	};
2034

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source: vbox/trunk/src/VBox/Additions/WINNT/VBoxTray/VBoxDnD.cpp

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