/// <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);