[WinApi] C#获取其他窗口文本框内容（转）

声明部分：

 const int WM_GETTEXT = 0x000D;
 const int WM_GETTEXTLENGTH = 0x000E;

 [DllImport("user32.dll", EntryPoint = "SendMessageA")]
 public static extern int SendMessage(int hwnd, int wMsg, int wParam, Byte[] lParam);

 [DllImport("user32.dll", EntryPoint="SendMessageA")]
 public static extern int SendMessage(int hwnd, int wMsg, int wParam, int lParam);

函数部分：

 IntPtr mwh = FindMainWindowHandle("窗口名称", , );  //主窗口句柄
 IntPtr HwndStatue = FindWindowEx(mwh, IntPtr.Zero, "Edit", null);   //文本框句柄

 if (HwndStatue != IntPtr.Zero)
 {
     int TextLen;
     TextLen = SendMessage((int)HwndStatue, WM_GETTEXTLENGTH, , );
     Byte[] byt = new Byte[TextLen];
     SendMessage((int)HwndStatue, WM_GETTEXT, TextLen + , byt);
     string str = Encoding.Default.GetString(byt);
 }