//-----------------------------------------------------------------------------
// Name: GetDirectXVersionViaDxDiag()
// Desc: Tries to get the DirectX version from DxDiag's COM interface
//-----------------------------------------------------------------------------
HRESULT GetDirectXVersionViaDxDiag( DWORD* pdwDirectXVersionMajor,
DWORD* pdwDirectXVersionMinor,
TCHAR* pcDirectXVersionLetter )
{
HRESULT hr;
bool bCleanupCOM = false;
bool bSuccessGettingMajor = false;
bool bSuccessGettingMinor = false;
bool bSuccessGettingLetter = false;
// Init COM. COM may fail if its already been inited with a different
// concurrency model. And if it fails you shouldn't release it.
hr = CoInitialize(NULL);
bCleanupCOM = SUCCEEDED(hr);
// Get an IDxDiagProvider
bool bGotDirectXVersion = false;
IDxDiagProvider* pDxDiagProvider = NULL;
hr = CoCreateInstance( CLSID_DxDiagProvider,
NULL,
CLSCTX_INPROC_SERVER,
IID_IDxDiagProvider,
(LPVOID*) &pDxDiagProvider );
if( SUCCEEDED(hr) )
{
// Fill out a DXDIAG_INIT_PARAMS struct
DXDIAG_INIT_PARAMS dxDiagInitParam;
ZeroMemory( &dxDiagInitParam, sizeof(DXDIAG_INIT_PARAMS) );
dxDiagInitParam.dwSize = sizeof(DXDIAG_INIT_PARAMS);
dxDiagInitParam.dwDxDiagHeaderVersion = DXDIAG_DX9_SDK_VERSION;
dxDiagInitParam.bAllowWHQLChecks = false;
dxDiagInitParam.pReserved = NULL;
// Init the m_pDxDiagProvider
hr = pDxDiagProvider->Initialize( &dxDiagInitParam );
if( SUCCEEDED(hr) )
{
IDxDiagContainer* pDxDiagRoot = NULL;
IDxDiagContainer* pDxDiagSystemInfo = NULL;
// Get the DxDiag root container
hr = pDxDiagProvider->GetRootContainer( &pDxDiagRoot );
if( SUCCEEDED(hr) )
{
// Get the object called DxDiag_SystemInfo
hr = pDxDiagRoot->GetChildContainer( L"DxDiag_SystemInfo", &pDxDiagSystemInfo );
if( SUCCEEDED(hr) )
{
VARIANT var;
VariantInit( &var );
// Get the "dwDirectXVersionMajor" property
hr = pDxDiagSystemInfo->GetProp( L"dwDirectXVersionMajor", &var );
if( SUCCEEDED(hr) && var.vt == VT_UI4 )
{
if( pdwDirectXVersionMajor )
*pdwDirectXVersionMajor = var.ulVal;
bSuccessGettingMajor = true;
}
VariantClear( &var );
// Get the "dwDirectXVersionMinor" property
hr = pDxDiagSystemInfo->GetProp( L"dwDirectXVersionMinor", &var );
if( SUCCEEDED(hr) && var.vt == VT_UI4 )
{
if( pdwDirectXVersionMinor )
*pdwDirectXVersionMinor = var.ulVal;
bSuccessGettingMinor = true;
}
VariantClear( &var );
// Get the "szDirectXVersionLetter" property
hr = pDxDiagSystemInfo->GetProp( L"szDirectXVersionLetter", &var );
if( SUCCEEDED(hr) && var.vt == VT_BSTR && var.bstrVal != NULL )
{
#ifdef UNICODE
*pcDirectXVersionLetter = var.bstrVal[0];
#else
char strDestination[10];
WideCharToMultiByte( CP_ACP, 0, var.bstrVal, -1, strDestination, 10*sizeof(CHAR), NULL, NULL );
if( pcDirectXVersionLetter )
*pcDirectXVersionLetter = strDestination[0];
#endif
bSuccessGettingLetter = true;
}
VariantClear( &var );
// If it all worked right, then mark it down
if( bSuccessGettingMajor && bSuccessGettingMinor && bSuccessGettingLetter )
bGotDirectXVersion = true;
pDxDiagSystemInfo->Release();
}
pDxDiagRoot->Release();
}
}
pDxDiagProvider->Release();
}
if( bCleanupCOM )
CoUninitialize();
if( bGotDirectXVersion )
return S_OK;
else
return E_FAIL;
}
HRESULT GetDirectXVersionViaDxDiag(CString& strDXVersionString)
{
HRESULT hr;
bool bCleanupCOM = false;
bool bSuccessGettingLetter = false;
// Init COM. COM may fail if its already been inited with a different
// concurrency model. And if it fails you shouldn't release it.
hr = CoInitialize(NULL);
bCleanupCOM = SUCCEEDED(hr);
// Get an IDxDiagProvider
bool bGotDirectXVersion = false;
IDxDiagProvider* pDxDiagProvider = NULL;
hr = CoCreateInstance( CLSID_DxDiagProvider,
NULL,
CLSCTX_INPROC_SERVER,
IID_IDxDiagProvider,
(LPVOID*) &pDxDiagProvider );
if( SUCCEEDED(hr) )
{
// Fill out a DXDIAG_INIT_PARAMS struct
DXDIAG_INIT_PARAMS dxDiagInitParam;
ZeroMemory( &dxDiagInitParam, sizeof(DXDIAG_INIT_PARAMS) );
dxDiagInitParam.dwSize = sizeof(DXDIAG_INIT_PARAMS);
dxDiagInitParam.dwDxDiagHeaderVersion = DXDIAG_DX9_SDK_VERSION;
dxDiagInitParam.bAllowWHQLChecks = false;
dxDiagInitParam.pReserved = NULL;
// Init the m_pDxDiagProvider
hr = pDxDiagProvider->Initialize( &dxDiagInitParam );
if( SUCCEEDED(hr) )
{
IDxDiagContainer* pDxDiagRoot = NULL;
IDxDiagContainer* pDxDiagSystemInfo = NULL;
// Get the DxDiag root container
hr = pDxDiagProvider->GetRootContainer( &pDxDiagRoot );
if( SUCCEEDED(hr) )
{
// Get the object called DxDiag_SystemInfo
hr = pDxDiagRoot->GetChildContainer( L"DxDiag_SystemInfo", &pDxDiagSystemInfo );
if( SUCCEEDED(hr) )
{
VARIANT var;
VariantInit( &var );
// Get the "szDirectXVersionLetter" property
hr = pDxDiagSystemInfo->GetProp( L"szDirectXVersionLongEnglish", &var );
if( SUCCEEDED(hr) && var.vt == VT_BSTR && SysStringLen( var.bstrVal ) != 0 )
{
strDXVersionString = CComBSTR(var.bstrVal);
bSuccessGettingLetter = true;
}
VariantClear( &var );
// If it all worked right, then mark it down
if( bSuccessGettingLetter )
bGotDirectXVersion = true;
pDxDiagSystemInfo->Release();
}
pDxDiagRoot->Release();
}
}
pDxDiagProvider->Release();
}
if( bCleanupCOM )
CoUninitialize();
if( bGotDirectXVersion )
return S_OK;
else
return E_FAIL;
}
