Just trying to learn a bit of Win API. Im trying to make a basic drawing app, a bit like MS Paint.

For the time being im trying to get one function to work which is, when you left click and drag the mouse around the screen a line is drawn behind the mouse. Heres what i have so far, but for some reason:

1) the line starts drawing straight away rather then waiting for the left click 2) the line isn't solid its very dotty.

case WM_MOUSEMOVE:
    {


        if(MK_LBUTTON){
        hdc = GetDC(hwnd);
        hPen = CreatePen(PS_SOLID,5,RGB(0, 0, 255));
        SelectObject(hdc, hPen);

        int x = LOWORD(lParam);
        int y = HIWORD(lParam);

        MoveToEx(hdc,x,y,NULL);
        LineTo(hdc, LOWORD(lParam), HIWORD(lParam));
        ReleaseDC(hwnd,hdc);
        }
        else
            break;

    }
}

Thanks for any help!