[WinApi] C#获取其他窗口文本框内容

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声明部分：

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

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

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

函数部分：

IntPtr mwh = FindMainWindowHandle("窗口名称", 100, 25);  //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(HwndStatue, WM_GETTEXTLENGTH, 0, 0);
    Byte[] byt = new Byte[TextLen];
    SendMessage(HwndStatue, WM_GETTEXT, TextLen + 1, byt);
    string str = Encoding.Default.GetString(byt);
}