Thread: Why the application receives 2 mouse clicks when I send out 1 mouse_event?

Sometimes it seems multiple mouse clicks are received by the application who owns (dx, dy) location while the following code section only executes once:

mouse_event(MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE, (DWORD)dx, (DWORD)dy, 0, 0);
mouse_event(MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_LEFTDOWN, (DWORD)dx, (DWORD)dy, 0, 0);
mouse_event(MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_LEFTUP, (DWORD)dx, (DWORD)dy, 0, 0);

Can someone explain this? Should I use some other function to avoid it? BTW I can only control the application which sends out the mouse click.

Thank you in advance!

Did more test and found that the section of code doesn't only execute once when multiple mouse clicks were simulated.

Here is what happened: I use a program to enumerate the windows on the desktop, and when I see some specific window, I will simulate a mouse click to that window. However, sometimes the window can be found during enumeration but it doesn't really "exist" --- means it is not visible and you can't click it. The mouse click will go to the window "behind" the invisible one. That's why I felt like there are more mouse clicks than it should.

This is just a clarification and sorry for the confusion!