[mr.exodia]

Try this one, it simulates an actual click, in combination with SetMousePos you can click anywhere:

void LeftClick()
{
    INPUT Input = {0};
    Input.type = INPUT_MOUSE;
    Input.mi.dwFlags = MOUSEEVENTF_LEFTDOWN;
    SendInput(1, &Input, sizeof(INPUT));
    ZeroMemory(&Input, sizeof(INPUT));
    Input.type = INPUT_MOUSE;
    Input.mi.dwFlags = MOUSEEVENTF_LEFTUP;
    SendInput(1, &Input, sizeof(INPUT));
}

Greetings