Program doesn't run functions repeatedly (C++) - c++

Question

I am making an autoclicker. The "ClickLoop" function I found on another SO post works, but I am trying to add a key to toggle the autoclicker on and off.
This is my code so far:
#include <windows.h>
#include <iostream>
#include <chrono>
#include <thread>
#include <random>
bool on = false;
void tick () {
if(GetKeyState('x') & 0x8000) {
on = !on;
}
tick();
};
void WINAPI ClickLoop(int delay) {
std::cout << "test" << std::endl;
while ((GetAsyncKeyState(VK_LBUTTON) & 0x8000) == 0) {
Sleep(1);
}
int nCurrKeyState = GetKeyState(VK_LBUTTON);
int nPrevKeyState;
do {
if (on) {
INPUT Input;
ZeroMemory(&Input, sizeof(INPUT));
Input.type = INPUT_MOUSE;
Input.mi.dwFlags = MOUSEEVENTF_LEFTUP;
SendInput(1, &Input, sizeof(INPUT));
Input.mi.dwFlags = MOUSEEVENTF_LEFTDOWN;
SendInput(1, &Input, sizeof(INPUT));
// Delay in MS
Sleep(delay);
nPrevKeyState = nCurrKeyState;
nCurrKeyState = GetKeyState(VK_LBUTTON);
if ((GetAsyncKeyState(VK_LBUTTON) & 0x8000) == 0)
break;
} else {
break;
}
} while (nCurrKeyState != nPrevKeyState);
ClickLoop(delay);
}
int main() {
int delay;
std::cout << "Delay in milliseconds: ";
std::cin >> delay;
tick();
ClickLoop(delay);
return 0;
}
I then use G++ to compile the code:
g++ main.cpp -o main
After running the "main" executable, I find that it starts up, asks me for the delay and then stops after a couple of seconds.
Why does this happen?

Answer 1

void tick () {
...
tick();
}
This is an endless recursion loop. Once main() calls tick(), the program is stuck in this loop and never reaches ClickLoop().
void WINAPI ClickLoop(int delay) {
...
ClickLoop(delay);
}
This is also an endless recursion loop.
You need to get rid of these recursive loops.
Another problem I see is that you are using GetKeyState() in places, but GetKeyState() depends on the calling thread having a message loop to process WM_(L|M|R)BUTTON(DOWN|UP) window messages to update the thread's internal keyboard state. But there is no window or message loop in this code.
GetAsyncKeyState() does not depend on a window or a message loop.