怎么检测主机的directx版本呢？

Question

如题

Answer 1

只判断到8.01的可通过接口，如果要判断到9.0，通过dll的版本判断
DWORD GetDXVersion()
{
    DIRECTDRAWCREATE     DirectDrawCreate   = NULL;
    DIRECTDRAWCREATEEX   DirectDrawCreateEx = NULL;
    DIRECTINPUTCREATE    DirectInputCreate  = NULL;
    HINSTANCE            hDDrawDLL          = NULL;
    HINSTANCE            hDInputDLL         = NULL;
    HINSTANCE            hD3D8DLL           = NULL;
    HINSTANCE            hDPNHPASTDLL       = NULL;
    LPDIRECTDRAW         pDDraw             = NULL;
    LPDIRECTDRAW2        pDDraw2            = NULL;
    LPDIRECTDRAWSURFACE  pSurf              = NULL;
    LPDIRECTDRAWSURFACE3 pSurf3             = NULL;
    LPDIRECTDRAWSURFACE4 pSurf4             = NULL;
    DWORD                dwDXVersion        = 0;
    HRESULT              hr;    // First see if DDRAW.DLL even exists.
    hDDrawDLL = LoadLibrary( "DDRAW.DLL" );
    if( hDDrawDLL == NULL )
    {
        dwDXVersion = 0;
        OutputDebugString( "Couldn't LoadLibrary DDraw\r\n" );
        return dwDXVersion;
    }    // See if we can create the DirectDraw object.
    DirectDrawCreate = (DIRECTDRAWCREATE)GetProcAddress( hDDrawDLL, "DirectDrawCreate" );
    if( DirectDrawCreate == NULL )
    {
        dwDXVersion = 0;
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't GetProcAddress DirectDrawCreate\r\n" );
        return dwDXVersion;
    }    hr = DirectDrawCreate( NULL, &pDDraw, NULL );
    if( FAILED(hr) )
    {
        dwDXVersion = 0;
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't create DDraw\r\n" );
        return dwDXVersion;
    }    // So DirectDraw exists.  We are at least DX1.
    dwDXVersion = 0x100;    // Let's see if IID_IDirectDraw2 exists.
    hr = pDDraw->QueryInterface( IID_IDirectDraw2, (VOID**)&pDDraw2 );
    if( FAILED(hr) )
    {
        // No IDirectDraw2 exists... must be DX1
        pDDraw->Release();
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't QI DDraw2\r\n" );
        return dwDXVersion;
    }    // IDirectDraw2 exists. We must be at least DX2
    pDDraw2->Release();
    dwDXVersion = 0x200;
//-------------------------------------------------------------------------
    // DirectX 3.0 Checks
//-------------------------------------------------------------------------    // DirectInput was added for DX3
    hDInputDLL = LoadLibrary( "DINPUT.DLL" );
    if( hDInputDLL == NULL )
    {
        // No DInput... must not be DX3
        pDDraw->Release();
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't LoadLibrary DInput\r\n" );
        return dwDXVersion;
    }    DirectInputCreate = (DIRECTINPUTCREATE)GetProcAddress( hDInputDLL,
                                                        "DirectInputCreateA" );
    if( DirectInputCreate == NULL )
    {
        // No DInput... must be DX2
        FreeLibrary( hDInputDLL );
        pDDraw->Release();
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't GetProcAddress DInputCreate\r\n" );
        return dwDXVersion;
    }    // DirectInputCreate exists. We are at least DX3
    dwDXVersion = 0x300;
    FreeLibrary( hDInputDLL );    // Can do checks for 3a vs 3b here
//-------------------------------------------------------------------------
    // DirectX 5.0 Checks
//-------------------------------------------------------------------------    // We can tell if DX5 is present by checking for the existence of
    // IDirectDrawSurface3. First, we need a surface to QI off of.
    DDSURFACEDESC ddsd;
    ZeroMemory( &ddsd, sizeof(ddsd) );
    ddsd.dwSize         = sizeof(ddsd);
    ddsd.dwFlags        = DDSD_CAPS;
    ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;    hr = pDDraw->SetCooperativeLevel( NULL, DDSCL_NORMAL );
    if( FAILED(hr) )
    {
        // Failure. This means DDraw isn't properly installed.
        pDDraw->Release();
        FreeLibrary( hDDrawDLL );
        dwDXVersion = 0;
        OutputDebugString( "Couldn't Set coop level\r\n" );
        return dwDXVersion;
    }    hr = pDDraw->CreateSurface( &ddsd, &pSurf, NULL );
    if( FAILED(hr) )
    {
        // Failure. This means DDraw isn't properly installed.
        pDDraw->Release();
        FreeLibrary( hDDrawDLL );
        dwDXVersion = 0;
        OutputDebugString( "Couldn't CreateSurface\r\n" );
        return dwDXVersion;
    }    // Query for the IDirectDrawSurface3 interface
    if( FAILED( pSurf->QueryInterface( IID_IDirectDrawSurface3,
                                       (VOID**)&pSurf3 ) ) )
    {
        pSurf->Release();
        pDDraw->Release();
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't QI DDS3\r\n" );
        return dwDXVersion;
    }    // QI for IDirectDrawSurface3 succeeded. We must be at least DX5
    dwDXVersion = 0x500;
    pSurf3->Release();
//-------------------------------------------------------------------------
    // DirectX 6.0 Checks
//-------------------------------------------------------------------------    // The IDirectDrawSurface4 interface was introduced with DX 6.0
    if( FAILED( pSurf->QueryInterface( IID_IDirectDrawSurface4,
                                       (VOID**)&pSurf4 ) ) )
    {
        pSurf->Release();
        pDDraw->Release();
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't QI DDS4\r\n" );
        return dwDXVersion;
    }    // IDirectDrawSurface4 was create successfully. We must be at least DX6
    dwDXVersion = 0x600;
    pSurf4->Release();
    pSurf->Release();
    pDDraw->Release();
//-------------------------------------------------------------------------
    // DirectX 6.1 Checks
//-------------------------------------------------------------------------    // Check for DMusic, which was introduced with DX6.1
    LPDIRECTMUSIC pDMusic = NULL;
    CoInitialize( NULL );
    hr = CoCreateInstance( CLSID_DirectMusic, NULL, CLSCTX_INPROC_SERVER,
                           IID_IDirectMusic, (VOID**)&pDMusic );
    if( FAILED(hr) )
    {
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't create CLSID_DirectMusic\r\n" );
        return dwDXVersion;
    }    // DirectMusic was created successfully. We must be at least DX6.1
    dwDXVersion = 0x601;
    pDMusic->Release();
    CoUninitialize();

Answer 2

//-------------------------------------------------------------------------
    // DirectX 7.0 Checks
//-------------------------------------------------------------------------    // Check for DirectX 7 by creating a DDraw7 object
    LPDIRECTDRAW7 pDD7;
    DirectDrawCreateEx = (DIRECTDRAWCREATEEX)GetProcAddress( hDDrawDLL,
                                                       "DirectDrawCreateEx" );
    if( NULL == DirectDrawCreateEx )
    {
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't GetProcAddress DirectDrawCreateEx\r\n" );
        return dwDXVersion;
    }    if( FAILED( DirectDrawCreateEx( NULL, (VOID**)&pDD7, IID_IDirectDraw7,
                                    NULL ) ) )
    {
        FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't DirectDrawCreateEx\r\n" );
        return dwDXVersion;
    }    // DDraw7 was created successfully. We must be at least DX7.0
    dwDXVersion = 0x700;
    pDD7->Release();
//-------------------------------------------------------------------------
    // DirectX 8.0 Checks
//-------------------------------------------------------------------------    // Simply see if D3D8.dll exists.
    hD3D8DLL = LoadLibrary( "D3D8.DLL" );
    if( hD3D8DLL == NULL )
    {
    FreeLibrary( hDDrawDLL );
        OutputDebugString( "Couldn't LoadLibrary D3D8.DLL\r\n" );
        return dwDXVersion;
    }    // D3D8.dll exists. We must be at least DX8.0
    dwDXVersion = 0x800;
//-------------------------------------------------------------------------
    // DirectX 8.1 Checks
//-------------------------------------------------------------------------    // Simply see if dpnhpast.dll exists.
    hDPNHPASTDLL = LoadLibrary( "dpnhpast.dll" );
    if( hDPNHPASTDLL == NULL )
    {
    FreeLibrary( hDPNHPASTDLL );
        OutputDebugString( "Couldn't LoadLibrary dpnhpast.dll\r\n" );
        return dwDXVersion;
    }    // dpnhpast.dll exists. We must be at least DX8.1
    dwDXVersion = 0x801;
//-------------------------------------------------------------------------
    // End of checking for versions of DirectX 
//-------------------------------------------------------------------------    // Close open libraries and return
    FreeLibrary( hDDrawDLL );
    FreeLibrary( hD3D8DLL );
    
    return dwDXVersion;
}