HRESULT GetDXVersion( DWORD* pdwDirectXVersion, TCHAR* strDirectXVersion, int cchDirectXVersion )
{
bool bGotDirectXVersion = false;
// Init values to unknown
if( pdwDirectXVersion )
*pdwDirectXVersion = 0;
if( strDirectXVersion && cchDirectXVersion > 0 )
strDirectXVersion[0] = 0;
DWORD dwDirectXVersionMajor = 0;
DWORD dwDirectXVersionMinor = 0;
TCHAR cDirectXVersionLetter = ' ';
// First, try to use dxdiag's COM interface to get the DirectX version.
// The only downside is this will only work on DirectX9 or later.
if( SUCCEEDED( GetDirectXVersionViaDxDiag( &dwDirectXVersionMajor, &dwDirectXVersionMinor, &cDirectXVersionLetter ) ) )
bGotDirectXVersion = true;
if( !bGotDirectXVersion )
{
// Getting the DirectX version info from DxDiag failed,
// so most likely we are on DirectX8.x or earlier
if( SUCCEEDED( GetDirectXVerionViaFileVersions( &dwDirectXVersionMajor, &dwDirectXVersionMinor, &cDirectXVersionLetter ) ) )
bGotDirectXVersion = true;
}
// If both techniques failed, then return E_FAIL
if( !bGotDirectXVersion )
return E_FAIL;
// Set the output values to what we got and return
cDirectXVersionLetter = (char)tolower(cDirectXVersionLetter);
if( pdwDirectXVersion )
{
// If pdwDirectXVersion is non-NULL, then set it to something
// like 0x00080102 which would represent DirectX8.1b
DWORD dwDirectXVersion = dwDirectXVersionMajor;
dwDirectXVersion <<= 8;
dwDirectXVersion += dwDirectXVersionMinor;
dwDirectXVersion <<= 8;
if( cDirectXVersionLetter >= 'a' && cDirectXVersionLetter <= 'z' )
dwDirectXVersion += (cDirectXVersionLetter - 'a') + 1;
*pdwDirectXVersion = dwDirectXVersion;
}
if( strDirectXVersion && cchDirectXVersion > 0 )
{
// If strDirectXVersion is non-NULL, then set it to something
// like "8.1b" which would represent DirectX8.1b
if( cDirectXVersionLetter == ' ' )
StringCchPrintf( strDirectXVersion, cchDirectXVersion, TEXT("%d.%d"), dwDirectXVersionMajor, dwDirectXVersionMinor );
else
StringCchPrintf( strDirectXVersion, cchDirectXVersion, TEXT("%d.%d%c"), dwDirectXVersionMajor, dwDirectXVersionMinor, cDirectXVersionLetter );
}
return S_OK;
}
DWORD GetDXVersion ()
{
DWORD version = 0;
bool bGotDirectXVersion = false;
// Init values to unknown
DWORD dwDirectXVersionMajor = 0;
DWORD dwDirectXVersionMinor = 0;
TCHAR cDirectXVersionLetter = ' ';
// First, try to use dxdiag's COM interface to get the DirectX version.
// The only downside is this will only work on DX9 or later.
if ( SUCCEEDED( GetDirectXVersionViaDxDiag( &dwDirectXVersionMajor, &dwDirectXVersionMinor, &cDirectXVersionLetter ) ) )
bGotDirectXVersion = true;
if ( !bGotDirectXVersion ) {
// Getting the DirectX version info from DxDiag failed,
// so most likely we are on DX8.x or earlier
if( SUCCEEDED( GetDirectXVerionViaFileVersions( &dwDirectXVersionMajor, &dwDirectXVersionMinor, &cDirectXVersionLetter ) ) )
bGotDirectXVersion = true;
}
// If both techniques failed, then return error
if (bGotDirectXVersion) {
// Set the output values to what we got and return
cDirectXVersionLetter = (char)tolower(cDirectXVersionLetter);
// Set version to something like 0x00080102 which would represent DX8.1b
version = dwDirectXVersionMajor;
version <<= 8;
version += dwDirectXVersionMinor;
version <<= 8;
if( cDirectXVersionLetter >= 'a' && cDirectXVersionLetter <= 'z' )
version += (cDirectXVersionLetter - 'a') + 1;
}
return (version);
}
HRESULT CUtils::GetDXVersionString( CString& strDXVersionString )
{
HRESULT hr = GetDirectXVersionViaDxDiag(strDXVersionString);
return hr;
}
