How do I program a parallel keyboard input - c++

Question

As written before, I would like to know how parallel keyboard input works.
This is my code so far:
cout << "Enter time for Key A: ";
cin >> timeA;
cout << "Enter time for Key B: ";
cin >> timeB;
while (1)
{
Sleep(timeA);
INPUT ip;
ip.type = INPUT_KEYBOARD;
ip.ki.time = 0;
ip.ki.dwFlags = KEYEVENTF_UNICODE; // Specify the key as a unicode character
ip.ki.wScan = 'A'; // Which keypress to simulate
ip.ki.wVk = 0;
ip.ki.dwExtraInfo = 0;
SendInput(1, &ip, sizeof(INPUT));
Sleep(timeB);
ip.type = INPUT_KEYBOARD;
ip.ki.time = 0;
ip.ki.dwFlags = KEYEVENTF_UNICODE; // Specify the key as a unicode character
ip.ki.wScan = 'B'; // Which keypress to simulate
ip.ki.wVk = 0;
ip.ki.dwExtraInfo = 0;
SendInput(1, &ip, sizeof(INPUT));
}
It works, but I would like to reach, that e.g. the Letter A is being pressed every 500ms and the Letter B is pressed every 1s. How would I do that?

Answer 1

This is a timer class. You can create an object and call it like:
timer timer_1(time_in_milliseconds, true_if_async, &function_name, argument_1, arg_2, ...);
This way you can run your functions after a certain amount of time has passed, you can run multiple functions together with async as well or just use sync and queue them. Your choice.
Threads is the best solution for your problem.
class timer
{
public:
template <class Callable, class... Arguments>
timer(int after, const bool async, Callable&& f, Arguments&&... args)
{
std::function<typename std::result_of<Callable(Arguments...)>::type()> task(bind(forward<Callable>(f), forward<Arguments>(args)...));
if (async)
{
thread([after, task]()
{
std::this_thread::sleep_for(std::chrono::milliseconds(after));
task();
}).detach();
}
else
{
std::this_thread::sleep_for(std::chrono::milliseconds(after));
task();
}
}
};
Here's a small example usage:
void say(const string& word)
{
cout << "Hello, " << word << "!\n";
}
int main(int argc, char* argv[])
{
while (true)
{
timer timer1(500, false, &say, "pyreN - A");
timer timer2(1000, false, &say, "pyreN - B");
}
}