Using _kbhit() in a console window.

[clu82]

This code is for a server. This question is about the code shown in red. I am wanting to add the ability to display stats in real-time when the 's' key is pressed. The code I added only seems to display at random intervals when the 's' key is pressed.

Am I using the _kbhit() function correctly? Can I use _kbhit() in this tight loop? Other ideas?

int main(int argc,char *argv[])
{
	SOCKET s;
	SOCKET ss;
	struct hostent *hp;
	struct sockaddr_in any_addr;
	struct sockaddr_in remote_addr;
	int addrlen;
	THREADARGS ThreadArgs;


	s = INVALID_SOCKET;
	hp = NULL;
	CLEAR_ADDR(&any_addr);
	CLEAR_ADDR(&remote_addr);
	addrlen = sizeof(struct sockaddr_in);

	if(argc < 2)
	{
		printf("usage: %s port [-Ln]\n",argv[0]);
		printf("-L: verbose level; 1, 2 or 3\n");
		return 0;
	} 

	ThreadArgs.VerboseLevel = 0;
	while (argc--)
	{
		if (!strncmp(argv[argc], "-L", 2))
			ThreadArgs.VerboseLevel = atoi(argv[argc]+2);
	}

	sockInit();

	/* specifies host and port */
	any_addr.sin_family = AF_INET;
	//any_addr.sin_port=htons( (unsigned short) atoi(argv[1]));
	any_addr.sin_port=htons(atoi(argv[1]));


	/* accepts connections from any client */
	any_addr.sin_addr.s_addr=htonl ( INADDR_ANY );

	/* creates socket */
	s = socket(AF_INET,SOCK_STREAM,0);

	if (s == INVALID_SOCKET)
	{
		printf("Can't create socket\n");
		sockEnd();
		return 2;
	}
	
	/* links socket to address and port */
	if(bind(s,(struct sockaddr *) &any_addr, sizeof(struct sockaddr_in)))
	{
		printf("Can't bind socket to address\n");
		sockEnd();
		return 3;
	}

	if ((fp = fopen("c:/winsock.txt", "w")) != NULL)
	{
		/* listens on port; maximum 5 requests pending */ 
		listen(s, 5);

		for( ; ; )
		{
			/* when someone connects, create a new socket for data exchange */
			ss=accept(s, (struct sockaddr *) &remote_addr, &addrlen);
			memcpy(&ThreadArgs.ss, &ss, sizeof(ss));

			if (_beginthread(serverThread,0,(void *) &ThreadArgs) == -1)
			{
				perror("_beginthread failed");
				break;
			}
			
			/* DEBUG MODE: show real-time stats when a key is pressed */
			if(_kbhit())
			{
				switch (_getch())
				{
				case 's':
					printf("Bytes Received: %ld\n",TotalBytesRecv);
					break;

				/* more options to follow */
				}
			}		
 
		}
		
		fclose(fp);

	} /* fopen() */


	sockEnd();

	return 0;
}

tia,

clu

[Hammer]

The code will block on the accept() call. Is that your problem?

[clu82]

Yes, that seems to be it. Thanks for pointing that out Hammer.