[WinApi] C#获取其他窗口文本框内容

声明部分：

1 const int WM_GETTEXT = 0x000D;
2 const int WM_GETTEXTLENGTH = 0x000E;
3  
4 [DllImport("user32.dll", EntryPoint = "SendMessageA")]
5 public static extern int SendMessage(int hwnd, int wMsg, int wParam, Byte[] lParam);
6  
7 [DllImport("user32.dll", EntryPoint="SendMessageA")]
8 public static extern int SendMessage(int hwnd, int wMsg, int wParam, int lParam);

函数部分：

 1 IntPtr mwh = FindMainWindowHandle("窗口名称", 100, 25);  //主窗口句柄
 2 IntPtr HwndStatue = FindWindowEx(mwh, IntPtr.Zero, "Edit", null);   //文本框句柄
 3  
 4 if (HwndStatue != IntPtr.Zero)
 5 {                
 6     int TextLen;
 7     TextLen = SendMessage((int)HwndStatue, WM_GETTEXTLENGTH, 0, 0);
 8     Byte[] byt = new Byte[TextLen];
 9     SendMessage((int)HwndStatue, WM_GETTEXT, TextLen + 1, byt);
10     string str = Encoding.Default.GetString(byt);
11 }