[vbox-dev] 答复: frontend with no display/framebuffer

Mon Sep 22 04:00:31 GMT 2014

Thanks and I write a nullframebuffer (grab from VBoxHeadless) and it work

And now I has another question. It seem that the own-defined frontend only
can start from virtualbox installed folder.

If I put my MyFrontEnd.exe into another folder and start it, the log say the
vm can not find the vboxvmm.dll and the path is wrong.

It look for core dlls from my exe’s dir.

Is it harden-coding?


发件人: Klaus Espenlaub [mailto:klaus.espenlaub at oracle.com] 
发送时间: 2014年9月18日 21:03
收件人: vbox-dev at virtualbox.org
主题: Re: [vbox-dev] frontend with no display/framebuffer


On 17.09.2014 12:03, DRACULAX wrote:

Hi, guys, I recently build my frontend which based on VBoxHeadless.exe

except that I do not create any framebuffer for it.

When I start my frontend it got the following error output. 

It looks like the vga device failed to start. 

Am I missing something? Is the framebuffer object needed anyway?

Yes, as long as the VGA card is configured (in 4.3 you can actually disable
it using CLI) it needs a framebuffer. Wonder why it's worth implementing a
framebuffer-less VBoxHeadless look-alike.

It's required to get at the screen content, and it was considered too
unusual to have a VGA card and no framebuffer. When disabling VGA it's a
valid setup.


Best regards for you


VirtualBox VM 4.3.10 r93012 win.amd64 (Mar 26 2014 18:53:57) release log

00:00:00.824047 Log opened 2014-09-17T08:54:22.362547900Z

00:00:00.824047 Build Type: release

00:00:00.963055 DMI Product Name: 3443A96

00:00:00.968055 DMI Product Version: ThinkPad X1 Carbon

00:00:00.968055 Host RAM: 3776MB total, 880MB available



00:00:03.319951 CPUM: SetGuestCpuIdFeature: Enabled APIC

00:00:03.335542 PIT: mode=3 count=0x10000 (65536) - 18.20 Hz (ch=0)

00:00:03.353628 Shared Folders service loaded.

00:00:03.364024 PDM: Failed to construct 'vga'/0! VERR_INVALID_STATE (-79) -
Generic invalid state error.


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