winform 打开外部程序获取其默认坐标 （查看exe文件运行句柄和类名方法）

引用：

 [DllImport("user32.dll", EntryPoint = "GetWindowThreadProcessId", SetLastError = true,
         CharSet = CharSet.Unicode, ExactSpelling = true,
         CallingConvention = CallingConvention.StdCall)]
        private static extern long GetWindowThreadProcessId(long hWnd, long lpdwProcessId);
        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern long SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll", EntryPoint = "GetWindowLongA", SetLastError = true)]
        private static extern long GetWindowLong(IntPtr hwnd, int nIndex);

        [DllImport("user32.dll", EntryPoint = "SetWindowLongA", SetLastError = true)]
        private static extern long SetWindowLong(IntPtr hwnd, int nIndex, long dwNewLong);
        //private static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
        [DllImport("user32.dll", SetLastError = true)]
        private static extern long SetWindowPos(IntPtr hwnd, long hWndInsertAfter, long x, long y, long cx, long cy, long wFlags);
        [DllImport("user32.dll", SetLastError = true)]
        private static extern bool MoveWindow(IntPtr hwnd, int x, int y, int cx, int cy, bool repaint);
        [DllImport("user32.dll", EntryPoint = "PostMessageA", SetLastError = true)]
        private static extern bool PostMessage(IntPtr hwnd, uint Msg, long wParam, long lParam);

        [DllImport("user32.dll")]
        private static extern int GetWindowRect(IntPtr hwnd, out Rect lpRect);
        [DllImport("user32.dll", EntryPoint = "FindWindowEx", SetLastError = true)]
        private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
        private const int SWP_NOOWNERZORDER = 0x200;
        private const int SWP_NOREDRAW = 0x8;
        private const int SWP_NOZORDER = 0x4;
        private const int SWP_SHOWWINDOW = 0x0040;
        private const int WS_EX_MDICHILD = 0x40;
        private const int SWP_FRAMECHANGED = 0x20;
        private const int SWP_NOACTIVATE = 0x10;
        private const int SWP_ASYNCWINDOWPOS = 0x4000;
        private const int SWP_NOMOVE = 0x2;
        private const int SWP_NOSIZE = 0x1;
        private const int GWL_STYLE = (-16);
        private const int WS_VISIBLE = 0x10000000;
        private const int WM_CLOSE = 0x10;
        private const int WS_CHILD = 0x40000000;

类：

   public struct Rect
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

 

 

外部程序句柄和窗体类名：

 

窗体代码：

 public PrintForm(string content) {
            InitializeComponent();
            this.textBox1.Text = content;
             exePath = System.AppDomain.CurrentDomain.BaseDirectory+ "\\FivePrint\\FivePrint.exe";
            //先杀一遍需要打开的文件的进程
            FileInfo file = new FileInfo(exePath);
            string SoftName = file.Name.Replace(file.Extension, string.Empty);
            Process[] Arr = Process.GetProcessesByName(SoftName);
            foreach (var p in Arr)
            {
                p.Kill();
            }
            //读取appdata下的文件
            // var path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.ApplicationData);
            // FileStream fs = new FileStream(path + "\\set.ini", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            // StreamReader reader = new StreamReader(fs,Encoding.Default);
            //var conStr = reader.ReadToEnd();

            p = new Process();//新建进程
            p.StartInfo.FileName = exePath;//设置进程名字
            p.Start();
            Rect rect = new Rect();
            IntPtr intPtr = new IntPtr(0);
            //句柄
            IntPtr hmain = FindWindow("ThunderRT6FormDC", null);//param: 窗体类名，窗体标题名称 任意一个参数即可
            //IntPtr hmain = FindWindow(null, p.MainWindowTitle);
            //获取其所在位置坐标rect
            GetWindowRect(hmain, out rect);

            this.Location = new Point(rect.Top, rect.Left);
            this.StartPosition = FormStartPosition.Manual;
         }