I need help figuring out why this auto-clicker doesn't work on some windows.

[MoonLightShines]

#ifdef __MINGW32__
#define _WIN32_WINNT 0x0501
#endif // __MINGW32__
#include <iostream>
#include <windows.h>
#include <string>
using namespace std;
LPVOID mousedown {


};
int main()
{
    int delay,y,clickboost,x,spin,times;
    bool tehee = false;
    POINT C;
    HWND hwnd;
    cout << "delay: ";
    cin >> delay;
    while (0==0) {
        if (GetAsyncKeyState(VK_MBUTTON)) {
            tehee = true;
            cout << "activated" << endl;
            while (GetAsyncKeyState(VK_MBUTTON)) {

            }
        }
        while (tehee==true) {
                hwnd = GetForegroundWindow();
                    GetCursorPos(&C);
                    x = C.x;
                    y = C.y;
                    if (GetAsyncKeyState(VK_LBUTTON)) {
                    PostMessage(hwnd,WM_LBUTTONDOWN,MK_LBUTTON,MAKELPARAM(x,y));
                    SendMessage(hwnd,WM_SETCURSOR,(WPARAM)hwnd,MAKELPARAM(HTCLIENT,WM_LBUTTONDOWN));
                    Sleep(delay);
                    PostMessage(hwnd,WM_LBUTTONUP,MK_LBUTTON,MAKELPARAM(x,y));
                    SendMessage(hwnd,WM_SETCURSOR,(WPARAM)hwnd,MAKELPARAM(HTCLIENT,WM_LBUTTONUP));
                    Sleep(delay);
                    }
            if (GetAsyncKeyState(VK_MBUTTON)) {
            tehee = false;
            cout << "deactivated" << endl;
            while (GetAsyncKeyState(VK_MBUTTON)) {

            }
            }
                }
        }
        }

I made an auto-clicker a couple weeks back that you use 'Z' to activate and deactivate. I then thought it'd be nice to have an auto-clicker that clicks when the left mouse button is held down. I first tried a loop with mouse_event, but that puts itself in an infinite loop due to mouse_event inputting VK_LBUTTON input, so you can't use getasynckeystate. I also can't use a hook because I have sleep statements in there, and passing those through a hook would slow down the whole computer. I discovered messages, and I knew this was how I would do it. The problem is this works on most games and windows, but on games like Roblox or windows like Foobar these don't click. I tried to add adding WM_SETCURSOR to make it work, but this didn't do anything. I am at a loss as I have been at this for a while. If someone has made something like this before, I would greatly appreciate the help.

[Arjay]

Look at using SendInput api.