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POConnecting C socket client to a C# socket server
 

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  1. POConnecting C socket client to a C# socket server
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    <p>im new to both C and C# language and i would appreciate any help/feedback on the following issue.</p> <p>Basically, im trying to make a socket connection in different programming languages. the client side has been developed in C and the server side in C#. Both application works well only when i tested in the same programming language, for example, the client side works well if the server is in C. same applies the server side in C#. the error encounter whenever the client.c tries to connect is "Connection refused" when gets this line in the code</p> <pre><code>if (connect(sockfd,(struct sockaddr *) &amp;serv_addr,sizeof(serv_addr)) &lt; 0) error("ERROR connecting"); </code></pre> <p>here is the code for both socket ends.</p> <p>client.c</p> <pre><code>/* Client socket demo */ int sockfd, n; struct sockaddr_in serv_addr; struct hostent *server; char buffer[256]; char hostname[1024]; //hostname[1023] = '\0'; struct hostent* h; gethostname(hostname, sizeof(hostname)); //printf("Hostname: %s\n", hostname); server = gethostbyname(hostname); //printf("h_name: %s\n", h-&gt;h_name); //portno = atoi(argv[2]); sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd &lt; 0) error("ERROR opening socket"); //server = gethostbyname(argv[1]); if (server == NULL) { fprintf(stderr,"ERROR, no such host\n"); exit(0); } bzero((char *) &amp;serv_addr, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; // only IPv4 memcpy(&amp;serv_addr.sin_addr, server-&gt;h_addr, server-&gt;h_length); // fixed part bcopy((char *)server-&gt;h_addr,(char *)&amp;serv_addr.sin_addr.s_addr,server-&gt;h_length); serv_addr.sin_port = htons(SERVERPORT); // htons((u_short)port); .sin_addr.S_un.S_addr = htonl(INADDR_ANY) //serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); if (connect(sockfd,(struct sockaddr *) &amp;serv_addr,sizeof(serv_addr)) &lt; 0) error("ERROR connecting"); printf("Please enter the message: "); bzero(buffer,256); fgets(buffer,255,stdin); n = write(sockfd,buffer,strlen(buffer)); if (n &lt; 0) error("ERROR writing to socket"); bzero(buffer,256); n = read(sockfd,buffer,255); if (n &lt; 0) error("ERROR reading from socket"); printf("here we are %s\n",buffer); close(sockfd); </code></pre> <p>server.cs</p> <pre><code>void ButtonStartListenClick(object sender, System.EventArgs e) { try { // Check the port value if(textBoxPort.Text == "") { MessageBox.Show("Please enter a Port Number"); return; } string portStr = textBoxPort.Text; int port = System.Convert.ToInt32(portStr); // Create the listening socket... m_mainSocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp); IPEndPoint ipLocal = new IPEndPoint (IPAddress.Any, port); // Bind to local IP Address... m_mainSocket.Bind( ipLocal ); // Start listening... m_mainSocket.Listen(4); // Create the call back for any client connections... m_mainSocket.BeginAccept(new AsyncCallback (OnClientConnect), null); UpdateControls(true); } catch(SocketException se) { MessageBox.Show ( se.Message ); } } </code></pre>
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    1. USCarlitos Overflow
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    1. COWell, the connection was refused. So make sure you're connecting to the right IP address and the right port. Check also your firewall settings.
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      1. USdtb
 

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