Winforms mouse capture

Question

I have a Windows Forms application and I need to capture mouse movements outside of my window. My simplified code in my window class:

private void ButtonOnClick(object sender, EventArgs e)
{
    Capture = true;
    MouseMove += OnMouseMove;
}

private void OnMouseMove(object sender, MouseEventArgs e)
{
    Console.Out.Write("!");
}

As you can see, when the user clicks the button, my program should start tracking the mouse (even if it is outside the window - this is the key task!) But I get really strange behavior. If I move the mouse inside the window, everything is fine ,! are written to the console. But when I move the mouse outside the window, only OnMouseMove is called only once (and the point is really outside). Then, if I move the mouse somewhere outside the window, it is no longer called. If I go back to the window, everything will be perfect. Go - 1 message, go to the window - OK.

Does anyone help?

Answer 1

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