/// <summary>Get text from the rich text box</summary>
public string GetText(int first = 0, int last = -1)
{
var range = new Win32.TEXTRANGE(first, last);
var len = SendMessage(Handle, Win32.EM_GETTEXTRANGE, 0, ref range);
var err = Marshal.GetLastWin32Error();
if (err != 0)
{
Marshal.ThrowExceptionForHR(err);
}
return(range.text);
}
[DllImport("user32", CharSet = CharSet.Unicode, SetLastError = true)] private static extern int SendMessage(IntPtr hwnd, uint msg, int wparam, ref Win32.TEXTRANGE lparam);
