both client & server?

This is a discussion on both client & server? within the Networking/Device Communication forums, part of the General Programming Boards category; is it possible to make a connection doing something like i've done in my code. a copy of the program ...

  1. #1
    Registered User
    Join Date
    Dec 2001
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    479

    both client & server?

    is it possible to make a connection doing something like i've done
    in my code.
    a copy of the program is ment to be used on another computer
    ive tried executing 2 copies and tested it on my own machine.
    the problem is that it detects the other user but u cant send and receive anything.
    i dont know if its a miss ive done in the code or its something with my computer or localserver.
    can someone with a good knowledge in networking explain to me what is wrong
    Code:
    
    #include <string.h>
    #include <iostream.h>
    #pragma comment (lib,"wsock32.lib")
    #include <winsock.h>
    #define     PORT 7777
    int main()
    {
    
    
        char *buf="MESSAGE";
    	char *rec=new char[256];
    	WORD sockVersion;
    	WSADATA wsaData;
    	sockVersion = MAKEWORD(2,0);		
        WSAStartup(sockVersion, &wsaData);
    
    
    
    	SOCKET sock1, sock2;
    
    	sock1=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    
     
    	HOSTENT *host;
    	host=gethostbyname("localhost");
    
    	SOCKADDR_IN in_s, ut_s;
    
    	in_s.sin_family=AF_INET;
    	in_s.sin_addr.s_addr=0;
    	in_s.sin_port=htons(PORT);
    
    	ut_s.sin_family=AF_INET;
    	ut_s.sin_port=htons(PORT);
    	ut_s.sin_addr=*((LPIN_ADDR)*host->h_addr_list);
    
    	
    
    	int b=bind(sock1,(const struct sockaddr*)&in_s,sizeof(struct sockaddr));
    	if(b==INVALID_SOCKET)
    	{
    		cout<<"error bind()";
    	}
    
    
    	int l=listen(sock1,10);
    	if(l==SOCKET_ERROR)
    	{
    		cout<<"error listen()";
    	}
    
    
    	int size=sizeof(struct sockaddr_in);
    
    	sock2=accept(sock1,(struct sockaddr*)&ut_s,&size);
    	if(sock2==SOCKET_ERROR)
    	{
    		cout<<"error accept()";
    	}
    
    
    		int s=send(sock2,buf,strlen(buf),0);
    		if(s==SOCKET_ERROR)
    		{
    			cout<<"error send()";
    		}
    		int r=recv(sock2,rec,sizeof(rec),0);
    		if(r==SOCKET_ERROR)
    		{
    			cout<<"error recv()";
    		}
    
    	int c=connect(sock1,(struct sockaddr*)&ut_s,sizeof(struct sockaddr));
    		if(c==SOCKET_ERROR)
    	{
    		cout<<"error connect()";
    	}
    	
    			
    				
    			
    		
    	
    
    		
    
    
    closesocket(sock1);
    closesocket(sock2);
    	WSACleanup();
    	return 0;
    }
    thanks for your help!

  2. #2
    End Of Line Hammer's Avatar
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    6,231
    Here's one clue, run this and understand the results it gives.
    Code:
    #include <iostream>
    using namespace std;
    int main(void)
    {
      char *rec = new char[256];
      cout <<sizeof(rec) <<endl ;
      return(0);
    }
    Also, when you encounter an error, for example bind() fails, you might want to exit the program as opposed to just carry on regardless.

    You don't issue connect()'s on sockets that you're using to listen on either.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    Registered User
    Join Date
    Dec 2001
    Posts
    479
    so what am i doing wrong to get a connection?

  4. #4
    End Of Line Hammer's Avatar
    Join Date
    Apr 2002
    Posts
    6,231
    Create two different programs, one a client, the other a server. That way it'll be easier to understand how they interact. You can still run both on the same machine, and connect to yourself.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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