取得屏幕上的一个颜色.用到了 [DllImport("gdi32.dll")]

private static extern bool BitBlt(

IntPtr hdcDest, // 目標設備的句柄

int nXDest, // 目標對像的左上角的X坐標

int nYDest, // 目標對像的左上角的X坐標

int nWidth, // 目標對像的矩形的寬度

int nHeight, // 目標對像的矩形的長度

IntPtr hdcSrc, // 源設備的句柄

int nXSrc, // 源對像的左上角的X坐標

int nYSrc, // 源對像的左上角的X坐標

int dwRop // 光柵的操作值

)



[DllImport("gdi32.dll")]

private static extern IntPtr CreateDC(

string lpszDriver, // 驅動名稱

string lpszDevice, // 設備名稱

string lpszOutput, // 無用，可以設定位"NULL"

IntPtr lpInitData // 任意的打印機數據

)

这两个API-To obtain a color screen. Use the [DllImport (gdi32.dll)] private static extern bool BitBlt (IntPtr hdcDest,// target device handle int nXDest,// target of the upper-left corner as the X coordinate int nYDest ,// target like the X coordinates of the upper-left corner int nWidth,// target like the width of the rectangle int nHeight,// target like the length of the rectangle IntPtr hdcSrc,// source device handle int nXSrc,// source as the upper-left corner of the X coordinate int nYSrc,// as the source of the X coordinates of the upper-left corner int dwRop// raster operation value) [DllImport (gdi32.dll)] private static extern IntPtr CreateDC ( string lpszDriver,// driver name string lpszDevice,// device name string lpszOutput,// useless, you can set bit NULL IntPtr lpInitData// any printer data) of these two API