C# user32.dll MouseHelper 鼠标前台模拟点击，鼠标后台模拟点击

前台鼠标点击

前台点击会占用鼠标操作，过程可见，且要求窗体在最顶层；

[DllImport("user32.dll", EntryPoint = "SetCursorPos")]
private static extern int SetCursorPos(int x, int y);

[DllImport("user32.dll", EntryPoint = "mouse_event")]
private static extern int Mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);
private static readonly int MOUSEEVENTF_MOVE = 0x0001;
private static readonly int MOUSEEVENTF_LEFTDOWN = 0x0002;
private static readonly int MOUSEEVENTF_LEFTUP = 0x0004;
private static readonly int MOUSEEVENTF_ABSOLUTE = 0x8000;
/// <summary>
/// 前台点击
/// </summary>
/// <param name="x">横坐标</param>
/// <param name="y">纵坐标</param>
public static void MouseClickHere(int x, int y)
{
     //1920和1080为屏幕分辨率,可根据情况调整
     Mouse_event(MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE, (x) * 65535 / 1920, (y) * 65535 / 1080, 0, 0);
     Mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);
}

后台鼠标点击

后台点击不会占用鼠标操作，过程不可见，需传入窗体句柄作为参数；

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