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CheckInterfaceSupport Method

2 posts in this topic

Regarding the CheckInterfaceSupport Method:

The following code tells me that my driver version is 2251872828981390, yet when I check dxdiag it claims a driver version of I am not quite sure what is wrong and would be most appreciative of any guidance.

IDXGIAdapter* test_dxgiAdapter = 0;
int num_adapters = 0;
while ( dxgiFactory->EnumAdapters(num_adapters,&test_dxgiAdapter) != DXGI_ERROR_NOT_FOUND) {
HR(test_dxgiAdapter->CheckInterfaceSupport( __uuidof(ID3D10Device),&lrg_int));
std::wostringstream outs;
outs << L"Your computer has " << num_adapters << L" display adapter(s). D3D driver version is " << lrg_int.QuadPart << L".";
MessageBox(0, outs.str().c_str(), 0, 0);

(HR macro is just checking for a failed HRESULT)

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There's nothing wrong really. If you convert that number to hex you get:

[font=courier new, courier, monospace]0x80011000D008E
..8|17| 13| 142[/font]

it's just packed into word sized values with the larger value. You can get the individual parts using the high and low parts of the large_integer with the word extraction macros:
std::wostringstream outs;
outs << L"Your computer has " << num_adapters << L" display adapter(s). D3D driver version is " <<
HIWORD(lrg_int.HighPart) << L'.' <<
LOWORD(lrg_int.HighPart) << L'.' <<
HIWORD(lrg_int.LowPart) << L'.' <<
It would be nice if the CheckInterfaceSupport help page documented this, but maybe it's dependent on what the driver vendor provides so there's no set format for it.

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