Thread: Capturing key stokes

But shouldn't the function be returning a bool, e.g true or false?

not necessarily, the if statement will result to false if the expression results to zero.

Code:

int num = 4;
if(num)
{
     cout << "hello";
}

That would print "hello" to the screen.

tests if the expression is zero or non-zero

this should clarify:

Code:

#include <iostream.h>

int main()
{
	int i=4;
	int x=-4;
                int y=0;
	
	if(i)
	    cout << "hello";
    
	if(x)
                    cout << "world";

	if(y)
                    cout << "nothing";
	
 	return 0;
}

GetAsyncKeyState() on MSDN

However, if you wanted to check for an ALT+something keypress in a console, try this:

Code:

#include <windows.h>
#include <iostream>

bool ALT(char key)
{
	HANDLE hInConsole = GetStdHandle(STD_INPUT_HANDLE);
	INPUT_RECORD	Event, SecondEvent;
	DWORD	NumberOfEvents, EventsRead, EventCounter, NumberOfSecondEvents, SecondEventsRead;
	GetNumberOfConsoleInputEvents(hInConsole, &NumberOfEvents);

	if (NumberOfEvents == 0)
		return false;
	
	for (EventCounter = 0; EventCounter < NumberOfEvents; EventCounter++)
	{
		PeekConsoleInput(hInConsole, &Event, 1, &EventsRead);
		if (Event.EventType == KEY_EVENT)
		{
			ReadConsoleInput(hInConsole, &Event, 1, &EventsRead);
			if (Event.Event.KeyEvent.wVirtualKeyCode == VK_MENU)
				while (Event.Event.KeyEvent.bKeyDown)
				{
					FlushConsoleInputBuffer(hInConsole);
					GetNumberOfConsoleInputEvents(hInConsole, &NumberOfSecondEvents);
					PeekConsoleInput(hInConsole, &SecondEvent, 1, &SecondEventsRead);
					if (SecondEvent.EventType == KEY_EVENT && SecondEvent.Event.KeyEvent.bKeyDown)
						if (SecondEvent.Event.KeyEvent.uChar.AsciiChar == key)
							return true;
				}
		}
		else
			ReadConsoleInput(hInConsole, &Event, 1, &EventsRead);
	}
	return false;
}

int main()
{
	std::cout << "Press ALT+F to quit\n";
	while(!ALT('f')) {}
	std::cout << "Wait! Now press ALT+Q!\n";
	while(!ALT('q')) {}
	std::cout << "Hehehe, now press ALT+X and you may go. . .\n";
	while(!ALT('x')) {}

	return 0;
}

Works for me