Opened 12 years ago
Closed 8 years ago
#11242 closed defect (obsolete)
VirtualBox frontend WH_KEYBOARD_LL global hook issue
| Reported by: | Mihai Hanor | Owned by: | |
|---|---|---|---|
| Component: | other | Version: | VirtualBox 4.2.4 |
| Keywords: | Cc: | ||
| Guest type: | all | Host type: | Windows |
Description
Host OS: Windows 7 SP1 64 bit
When using the VirtualBox frontend, the WH_KEYBOARD_LL global hook, which gets activated when the VirtualBox VM window comes in focus (UIKeyboardHandler::eventFilter), interferes with the keyboard input of all other processes, if the VirtualBox process is suspended (e.g. while being debugged). The result is each pressed key is delayed several seconds, while the OS is somewhat frozen (not responding as usual). That makes local debugging impossible, if the execution of the VirtualBox frontend gets interrupted while the VM window is in focus.
I don't know if it would fix the issue, but the MSDN documentation does state: "All global hook functions must be in libraries." http://msdn.microsoft.com/en-us/library/windows/desktop/ms644990%28v=vs.85%29.aspx
Could Raw Input be an alternative?
You should be able to reproduce the issue using a timed execution of Sysinternals PSSuspend tool, while the VM window has focus: http://technet.microsoft.com/en-us/sysinternals/bb897540
Please reopen if still relevant with a recent VirtualBox release.