Thread: Moving the mouse with SendMessage / PostMessage

Hi,
I have a few questions:

1. What is the difference between SendMessage and PostMessage?

2. Am I using SendMessage correctly? I want to emulate mouse movement in a certain window while still being able to use the computer.

Code:

#include <iostream>
#include <windows.h>
using namespace std;

int main() {
    POINT btn;
    HWND mWindow;
    cout<<"Set Mouse Over button and press ENTER";
    cin.get();
    GetCursorPos(&btn);
    cout<<"\nAfter Pressing ENTER, you have 5 seconds to set focus to the correct window.";
    cin.get();
    Sleep(5000);
    mWindow = GetFocus();

   SendMessage(mWindow,WM_MOUSEMOVE,0,MAKELPARAM(btn.x,btn.y));
   SendMessage(mWindow,WM_LBUTTONDOWN,0,MAKELPARAM(btn.x,btn.y));
   SendMessage(mWindow,WM_LBUTTONUP,0,MAKELPARAM(btn.x,btn.y));
   return 0;
}

Please DO NOT suggest SendInput / mouse_event. They do not do what I am looking for. (AKA they hijack the mouse)

Thanks!