C#动态获取鼠标位置的颜色

API声明：

/// <summary>

/// 获取指定窗口的设备场景

/// </summary>

/// <param name="hwnd">将获取其设备场景的窗口的句柄。若为0，则要获取整个屏幕的DC</param>

/// <returns>指定窗口的设备场景句柄，出错则为0</returns>

[DllImport("user32.dll")]

public static extern IntPtr GetDC(IntPtr hwnd);



/// <summary>

/// 释放由调用GetDC函数获取的指定设备场景

/// </summary>

/// <param name="hwnd">要释放的设备场景相关的窗口句柄</param>

/// <param name="hdc">要释放的设备场景句柄</param>

/// <returns>执行成功为1，否则为0</returns>

[DllImport("user32.dll")]

public static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);



/// <summary>

/// 在指定的设备场景中取得一个像素的RGB值

/// </summary>

/// <param name="hdc">一个设备场景的句柄</param>

/// <param name="nXPos">逻辑坐标中要检查的横坐标</param>

/// <param name="nYPos">逻辑坐标中要检查的纵坐标</param>

/// <returns>指定点的颜色</returns>

[DllImport("gdi32.dll")]

public static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

使用：
public Color GetColor( int x, int y)
{
   IntPtr hdc = GetDC( IntPtr . Zero); uint pixel = GetPixel(hdc, x, y);
   ReleaseDC( IntPtr . Zero, hdc);
   Color color = Color . FromArgb(( int )(pixel & 0x000000FF), ( int )(pixel & 0x0000FF00) >> 8, ( int )(pixel & 0x00FF0000) >> 16);
   return color;
}