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Run for a certain amount of time.

Stronghead (6)
Hello, I am trying to write a program that checks if a person presses an arrow key within a 2 second period. If the arrow is not in a two second period, the program closes. I understand how to get the arrow key with kbhit and getch, however, I do not know how to test it for only those two seconds. Any help would be appreciated.
Thank You,
Stronghead
Pravesh Koirala (267)
Use clock().
Its defined in the header ctime
Stronghead (6)
Alright I'll look into it, thanks a lot.
Stronghead (6)
Hello, I have been experimenting for a few hours, and I still can not understand how to get the clock function to work. Can someone please help me.
Duthomhas (13206)
The standard clock() function is not the right answer.

You need a system-dependent function which waits on a key press with a timeout. The following will work on Windows or any POSIX system (like Linux or Mac OS X):

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// iskeypressed()           - is a key press waiting to be read right now?
// iskeypressed( 1000 )     - wait up to a second for a key press before timeout
//                            (specify max wait timeout in milliseconds)
// iskeypressed( INFINITE ) - wait for a key press with no timeout (i.e. forever)

#ifdef _WIN32

#include <windows.h>

bool iskeypressed( unsigned timeout_ms = 0 )
  {
  return WaitForSingleObject(
    GetStdHandle( STD_INPUT_HANDLE ),
    timeout_ms
    ) == WAIT_OBJECT_0;
  }

#else

#include <unistd.h>
#include <poll.h>

#define INFINITE (-1)

bool iskeypressed( unsigned timeout_ms = 0 )
  {
  struct pollfd pls[ 1 ];
  pls[ 0 ].fd     = STDIN_FILENO;
  pls[ 0 ].events = POLLIN | POLLPRI;
  return poll( pls, 1, timeout_ms ) > 0;
  }

#endif

Hope this helps.
Last edited on
Stronghead (6)
Thank you very much for your help , however, I'm farily new to programming, and I didn't understand any of that. If you don't mind, would it be possible for you to help me with my code. The project is basically a copy of dance dance revolution for the keyboard. The current bugs are the fact that the game will not continue until you press a key, and that only about 30% of the hits count.
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#include <iostream>
#include <conio.h>
#include <math.h>
#include <ctime>
using namespace std;

void _checkarrow(int randomarrow,int &score)
{
	char checkkey;
	if (randomarrow == 1)
		{
			checkkey = _getch();
			cout << checkkey;//Debugging purposes
			if (checkkey == -32 || checkkey == 0)
				{	
					checkkey = _getch();
					switch (checkkey)
					{
						case 72:
							score++;
							cout << "Clicked";//Debugging purposes
							break;
						default:
							break;
					}

				}
		}
		if (randomarrow == 2)
		{
			_kbhit();
			checkkey = _getch();
			cout << checkkey;
			if (checkkey == -32 || checkkey == 0)
				{	
					checkkey = _getch();
					switch (checkkey)
					{
						case 80:
							score++;
							cout << "Clicked";
							break;
						default:
							break;
					}

				}
		}
		if (randomarrow == 3)
		{
			_kbhit();
			checkkey = _getch();
			cout << checkkey;
			if (checkkey == -32 || checkkey == 0)
				{	
					checkkey = _getch();
					switch (checkkey)
					{
						case 75:
							score++;
							cout << "Clicked";
							break;
						default :
							break;
						
					}

				}
		}
		if (randomarrow == 4)
		{
			_kbhit();
			checkkey = _getch();
			cout << checkkey;
			if (checkkey == -32 || checkkey == 0)
				{	
					checkkey = _getch();
					switch (checkkey)
					{
					case 77:
						score++;
							cout <<"Clicked";
					default:
						break;
						
					}

				}

}
}


void main()
{
	
	int randomarrow = 0;
	int score = 0;
	char checkkey;
	srand(time(0));
	for (int counter = 0; counter < 10; counter++)
	{
		
		
		randomarrow = 1 + rand() % 4;
		_sleep(1000);
		if (randomarrow == 1)
		{
			cout << "                 *              \n";
            cout << "               *   *            \n";
            cout << "             *       *          \n";
            cout << "           *           *        \n";
            cout << "         *       *       *      \n";
            cout << "                 *              \n";
            cout << "                 *              \n";
            cout << "                 *              \n";
            cout << "                 *              \n";
            cout << "                 *              \n";
            cout << "                 *              \n";
            cout << "                 *              \n";
            cout << "                 *              \n";
		}
		if (randomarrow == 2)
		{
			cout<< "                     *                           \n";
			cout<< "                   *                             \n";
			cout<< "                 *                               \n";
			cout<< "               *                                 \n";
			cout<< "             *        ************************   \n";
			cout<< "               *                                 \n";
			cout<< "                 *                               \n";
			cout<< "                   *                             \n";
			cout<< "                     *                           \n";
		}
		if (randomarrow == 3)
		{
			cout << "                  *             \n";
			cout << "                  *             \n";
			cout << "                  *             \n";
			cout << "                  *             \n";
			cout << "                  *             \n";
			cout << "                  *             \n";
			cout << "                  *             \n";
			cout << "                  *             \n";
			cout << "                  *             \n";
			cout << "          *               *     \n";
			cout << "            *           *       \n";
			cout << "              *       *         \n";
			cout << "                *   *           \n";
			cout << "                  *             \n";
		}
		if (randomarrow == 4)
		{
			cout<< "                                *         \n";
			cout<< "                                  *       \n";
			cout<< "                                    *     \n";
			cout<< "                                      *   \n";
			cout<< "        ************************        * \n";
			cout<< "                                      *   \n";         
			cout<< "                                    *     \n";
			cout<< "                                  *       \n";
			cout<< "                                *         \n";
		}
		else
			;
	
		_sleep(1000);
		_checkarrow(randomarrow,score);
		_sleep(500);
		system("CLS");
		}

		
		
	

	cout <<"Your score is: " << score <<"\n";
	
}


Thank You Very Much
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