Question

Is there any way I can send a left click event to a TextBox? for what ever the reason although I am doing a TextBox.Focus() and the cursor is blinking inside the TextBox but I cannot start typing in it, But if I do an extra click with the mouse inside the text box then I can start typing. So, I was wondering how to send that event to it?

Answer 1

To send mouse events, you’ll need to import user32.dll and use mouse_event(long dwFlags, long dx, long dy, long cButtons, long dwExtraInfo);


Example

class Mouse
{
    [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
    public static extern void mouse_event(long dwFlags, long dx, long dy, long cButtons, long dwExtraInfo);

    private const int MOUSEEVENTF_LEFTDOWN = 0x02; //Left click
    private const int MOUSEEVENTF_LEFTUP = 0x04;
    private const int MOUSEEVENTF_RIGHTDOWN = 0x08; //Right click
    private const int MOUSEEVENTF_RIGHTUP = 0x10;

    public static void sendMouseRightclick(Point p)
    {
        mouse_event(MOUSEEVENTF_RIGHTDOWN | MOUSEEVENTF_RIGHTUP, p.X, p.Y, 0, 0); //Sends a mouse right click at the specified Point
    }
    public static void sendMouseClick(Point p)
    {
        mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, p.X, p.Y, 0, 0); //Sends a mouse left click at the specified Point
    }
}

When using this, you may call Mouse.sendMouseClick(Point p) to send a mouse left click at the specified point.

In your case, I think that you might want to use Mouse.sendMouseClick(TextBox.Location); to send a mouse left click at the current TextBox position.

Thanks,

Have a great day 🙂