[DllImport("user32.dll")]
public static extern bool GetCursorPos(out POINT lpPoint);
 
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
  public int X;
  public int Y;
  public POINT(int x, int y)
  {
    this.X = x;
    this.Y = y;
  }
}

//获取屏幕
      int width = (int)SystemParameters.PrimaryScreenWidth;//得到屏幕整体宽度
      int height = (int)SystemParameters.PrimaryScreenHeight;//得到屏幕整体高度
//获取鼠标初始位置，相对屏幕的绝对位置
      System.Drawing.Point p = new System.Drawing.Point();

      ApiHelper.GetCursorPos(out p);
      if (width != 0) p.X = 65535 * p.X / width;
      if (height != 0) p.Y = 65535 * p.Y / height;
//设置移动的位置坐标
      int dy = 100;
      int dx = 100;
      dx = (int)(dx * 65535 / width);
      dy = (int)(dy * 65535 / height);
           
//移到指定位置 

ApiHelper.mouse_event((int)(MouseEventFlag.MOUSEEVENTF_MOVE | MouseEventFlag.MOUSEEVENTF_ABSOLUTE), dx, dy, 0, IntPtr.Zero);//移动到需要点击的位置
    
//完成一次点击
ApiHelper.mouse_event((int)(MouseEventFlag.MOUSEEVENTF_LEFTDOWN), 0, 0, 0, IntPtr.Zero);
ApiHelper.mouse_event((int)(MouseEventFlag.MOUSEEVENTF_LEFTUP), 0, 0, 0, IntPtr.Zero);//
//单击可以写为
ApiHelper.mouse_event((int)(MouseEventFlag.MOUSEEVENTF_LEFTDOWN | MouseEventFlag.MOUSEEVENTF_LEFTUP), 0, 0, 0, IntPtr.Zero);
//双击则再重复单击方法
 
//回到初始位置
 ApiHelper.mouse_event((int)(MouseEventFlag.MOUSEEVENTF_MOVE | MouseEventFlag.MOUSEEVENTF_ABSOLUTE), p.X, p.Y, 0, IntPtr.Zero);//移动到需要点击的位置