檢查裝置支援的像素格式

DescribePixelFormat函式會取得裝置內容的像素格式資料。 它也會傳回整數，這是裝置內容的最大像素格式索引。 下列程式碼範例示範如何使用該結果逐步執行，並檢查裝置支援的像素格式：

// local variables  
int                      iMax ; 
PIXELFORMATDESCRIPTOR    pfd; 
int                      iPixelFormat ; 
 
// initialize a pixel format index variable  
iPixelFormat = 1; 
 
// keep obtaining and examining pixel format data...  
do { 
    // try to obtain some pixel format data  
    iMax = DescribePixelFormat(hdc, iPixelFormat, sizeof(pfd), &pfd); 
 
    // if there was some problem with that...   
    if (iMax == 0) 
     
        // return indicating failure  
        return(FALSE); 
     
    // we have successfully obtained pixel format data  
 
    // let's examine the pixel format data...  
    myPixelFormatExaminer (&pfd); 
    }  
 
// ...until we've looked at all the device context's pixel formats  
while (++iPixelFormat <= iMax);