Hi Robert,
It's recommended to read API function docs before using them (or at
least when you hit problems :) ):
Docs say:
Takes a screen shot of the requested size and copies it to the
32-bpp buffer allocated by the caller and pointed to by @a address.
A pixel consists of 4 bytes in order: B, G, R, 0.
So bpp when you calculate buffer size must always be 32.
Nikolay.
On 7/5/10 3:55 AM, Robert Ramsay wrote:
Hello VirtualBox Developers,
I'm testing out the C++ COM API and when I use the takeScreenShot
method over COM the VirtualBox crashes. Please correct me if my code
is wrong. Although, bad pointers alone shouldn't crash the VM. I'm
aware that this is the raw COM and not the GLUE methods nor does the
memory buffer use a COM interface (for reference counting). The source
code is below.
Thanks,
Robert Ramsay
int testTakeScreenShot(ISession *session)
{
IConsole *console = NULL;
IDisplay *display = NULL;
unsigned long width, height, bpp;
SIZE_T buffersize;
BYTE* databuff;
HRESULT rc;
if (session == NULL)
return 1;
/* Get console object. */
session->get_Console(&console);
console->get_Display(&display);
display->GetScreenResolution(0,&width,&height,&bpp);
printf("Width: %ul Height: %ul Bits Per Pixel: %ul. ",
width,height,bpp);
buffersize = width*height*bpp/8;
databuff = (BYTE*)CoTaskMemAlloc(buffersize);
// Test databuffer
if (databuff != NULL)
{
rc = display->TakeScreenShot(0,databuff,width,height);
if (SUCCEEDED(rc))
{
printf("Took a screenshot! %d\n", rc);
}
else
{
printf("Error taking screen shot! rc = 0x%x\n", rc);
return rc;
}
CoTaskMemFree(databuff);
}
return 0;
}
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