C#动态获取鼠标位置的颜色
2010-11-12 08:22:12 来源:WEB开发网核心提示: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,C#动态获取鼠标位置的颜色,则要获取整个屏幕的DC</param>///
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);
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; }
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