win32Helper

        #region 点击别的窗口的按钮
        [DllImport("user32.dll", EntryPoint = "FindWindowA", SetLastError = true)]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", EntryPoint = "FindWindowEx", SetLastError = true)]
        private static extern IntPtr FindWindowEx(IntPtr hwndParent, uint hwndChildAfter, string lpszClass, string lpszWindow);

        [DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true, CharSet = CharSet.Auto)]
        private static extern int SendMessage(IntPtr hwnd, uint wMsg, int wParam, int lParam);

        [DllImport("user32.dll", EntryPoint = "SetForegroundWindow", SetLastError = true)]
        private static extern void SetForegroundWindow(IntPtr hwnd);
        public static void ClickOtherWindowsBtn(string targetWindowsTitile ,string btnText)
        {
            try
            {

                const int WM_CLICK = 0x00F5;//鼠标点击消息，各种消息的数值，可以参考MSDN  

                IntPtr hwndTestChild = new IntPtr();//子窗体的句柄  
                IntPtr hwndbtnYes = new IntPtr();//子窗体上button的句柄  

                hwndTestChild = FindWindow(null, targetWindowsTitile);//获取子窗体的句柄  
                hwndbtnYes = FindWindowEx(hwndTestChild, 0, null, btnText);//获取子窗体上button的句柄  

                if (hwndTestChild != IntPtr.Zero)
                {
                    SendMessage(hwndbtnYes, WM_CLICK, 0, 0);//给子窗体上button发送鼠标点击消息，  
                }
                else
                {
                    Console.WriteLine("没有找到按钮");
                }


            }
            catch (System.Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }

        #endregion