Question:
How do I use the mouse_event() procedure to simulate a mouse
event?
Answer:
The following example demonstrates using the Windows API
function mouse_event() to simulate a mouse event. When Button2
is clicked, the example code places the mouse over Button1 and
clicks it. Mouse Coordinates given are in "Mickeys", where
their are 65535 "Mickeys" to a screen's width.
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage('Button 1 clicked');
end;
procedure TForm1.Button2Click(Sender: TObject);
var
Pt : TPoint;
begin
{Allow Button2 to repaint it's self}
Application.ProcessMessages;
{Get the point in the center of button 1}
Pt.x := Button1.Left + (Button1.Width div 2);
Pt.y := Button1.Top + (Button1.Height div 2);
{Convert Pt to screen coordinates}
Pt := ClientToScreen(Pt);
{Convert Pt to mickeys}
Pt.x := Round(Pt.x * (65535 / Screen.Width));
Pt.y := Round(Pt.y * (65535 / Screen.Height));
{Move the mouse}
Mouse_Event(MOUSEEVENTF_ABSOLUTE or
MOUSEEVENTF_MOVE,
Pt.x,
Pt.y,
0,
0);
{Simulate the left mouse button down}
Mouse_Event(MOUSEEVENTF_ABSOLUTE or
MOUSEEVENTF_LEFTDOWN,
Pt.x,
Pt.y,
0,
0);;
{Simulate the left mouse button up}
Mouse_Event(MOUSEEVENTF_ABSOLUTE or
MOUSEEVENTF_LEFTUP,
Pt.x,
Pt.y,
0,
0);;
end;