C / C++ / MFC

akshay.is.gr8 wrote:

please give me some code examples

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[My articles]

1. Use the code block button to surround your code snippet with <pre> tags, this way your code will be more readable.
2. There's a logic flaw in your while loop, you should:
   
   
   
   1. initialize cmpflag (i.e. cmpflag=0;) before the while loop begins.
   2. set cmpflag=1; whenever you find a matching entry (and optionally use the break; statement to skip the loop, since there's no need for further comparison).
      
   
   

yamaki308 wrote:

There are two functions that I'm using as threads

// receive messages
void _cdecl receiveMsgThread(LPVOID lpParam)
{
	int len = 0, n = 0;
	SOCKET *pSock = (SOCKET *)lpParam;
	char *t_buffer = new char[BUFFER_LEN];
	memset(t_buffer, 0, BUFFER_LEN * sizeof(char));
	char *pBuffer = t_buffer;

	// retrieve 4 bytes of message
	n = recv(*pSock, pBuffer, sizeof(t_buffer), 0);

	if(n > 0)
	{
                // get the len of the string
		len = (int)pBuffer[0] + 1;
		
                // get the message
		do
		{
                        // move the pointer by # of bytes received
                        // to get the next set characters
			pBuffer += n;
                        
                        // decrease the length of the string 
                        // by the # of bytes received
			len -= n;
                        
                        // get the next set of character of n-bytes
			n = recv(*pSock, pBuffer, n, 0);	
		}while(len > 0);
		
		// print the message
		std::cout<<&t_buffer[1]<<"\n";
	}
	
	if(t_buffer)delete []t_buffer;
	t_buffer = NULL;
	_endthread();
}

while(!done)
{	
        _beginthread(receiveMsgThread, 0, &hSocket);

        if(_kbhit())
        {
            memset(msg_buffer, 0, MSG_LEN * sizeof(char));

            std::cout<<MSG_PROMPT;
            // input the message
            inputString(msg_buffer, MSG_LEN);
            std::cout<<"\n";

            if(strcmp(msg_buffer, "\\goodbye") == 0)
                done = !done;
            else
            {
	        memset(buffer, 0, BUFFER_LEN * sizeof(char));

                // store the message into the buffer
                strcpy(&buffer[1], usrName);
                strcat(&buffer[1], " says, \"");
                strcat(&buffer[1], msg_buffer);
                strcat(&buffer[1], "\"");

		buffer[0] = (char)strlen(&buffer[1]);
				
                // send the message
                send(hSocket, buffer, (int)strlen(buffer), 0);
                
            }
        }
} 

yamaki308 wrote:

when the client sends a message it calls the _beginthread() function which calls the receiveMsgThread() function to keep the thread alive. The receiveMsgThread function gets the message until the loop breaks at (len > 0) where len == 0. When len == 0 it calls the recv function one last time and it blocks until I, the client, close the program. If I close the program, the host gets the message that has been received. It does the same thing for host when sending messages

yamaki308 wrote:

The entire program works as far as creating sockets, connecting to the host, and such

yamaki308 wrote:

but the problem IS the receiveMsgThread() function

Saurabh.Garg wrote:

Haven't you asked the same question 3-4 time already? Did you try suggestions given previously?