how to get VideoCard information using DeviceIoControl

how can i get videocard information (Model, Chipset, VideoMemory ammount, supported display modes) using DeviceIoControl();

here is some code that i have. i think it's wrong. what should i do?

sprintf(DeviceName, "\\\\.\\DISPLAY1");
hDevice = CreateFile(DeviceName, GENERIC_READ,
                               FILE_SHARE_READ,
                            NULL, OPEN_EXISTING,
                               FILE_ATTRIBUTE_NORMAL, NULL);
if(hDevice != NULL)
{
   DeviceIoControl(hDevice, 0,
                          &InBuffer, InBufferSize,
                          &OutBuffer, OutBufferSize,
                          &BytesReturned, NULL);
   .....
}
CloseHandle(hDevice);
CrackmanAsked:
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George TokasCommented:
Supposed that you are using windows and all are setted up correctly you can get those info AND from registry and from DirectX.
Registry have all the info you want about display modes chipset and model.
The memory ammound can be retrieved through DirectX functions.

gtokas.
0
CrackmanAuthor Commented:
i know about directX functions of getting memory ammount, but i wanted to do it without directX.
BTW Is there any way to get AGP info from registry.
Actully i need as much information as i can get without DirectX.
Can you explain where exactly in registry this information is.
0
George TokasCommented:
As I saw in one of my machines (winME) the info is at PCI at registry.
the info you need is at HKEY_LOCAL_MACHINE\System\currentcontrolset\services\class\DISPLAY
As 4 DirectX anyway it is installed on windows machines with version >3 so without any problem you can use those functions.

gtokas.
0

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CrackmanAuthor Commented:
registry sucks
i'll use dirextx. i wasn't sure about it but now i think it will work fine.
0
George TokasCommented:
It will but you will not get info about chipset and model...
Anyway there is a way to find those without using the registry using the VGA registers but it is not that easy...

Regards,
gtokas
0
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