连接C套接字客户端到c#套接字服务器

我对C和c#语言都不熟悉，如果有任何关于以下问题的帮助/反馈，我将不胜感激。

基本上，我试图使一个套接字连接在不同的编程语言。客户端是用C语言开发的，服务器端是用c#开发的。这两个应用程序只有在我用相同的编程语言进行测试时才能正常工作，例如，如果服务器使用C语言，则客户端工作良好。当client.c在代码

中获得这一行时，每当尝试连接时遇到的错误是"Connection refused"。

if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0) 
    error("ERROR connecting");

下面是套接字两端的代码。

client.c

/* 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->h_name);
//portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) 
    error("ERROR opening socket");
//server = gethostbyname(argv[1]);
if (server == NULL) {
    fprintf(stderr,"ERROR, no such host'n");
    exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET; // only IPv4
memcpy(&serv_addr.sin_addr, server->h_addr, server->h_length); // fixed part
bcopy((char *)server->h_addr,(char *)&serv_addr.sin_addr.s_addr,server->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 *) &serv_addr,sizeof(serv_addr)) < 0) 
    error("ERROR connecting");
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0) 
     error("ERROR writing to socket");
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0) 
     error("ERROR reading from socket");
printf("here we are %s'n",buffer);
close(sockfd);

server.cs

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 );
        }
  }