Winsock Client & Server code example

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C

I have download a Winsock code example,and want to make the client and server communicate. When i build the server, it is successful, but the output is "bind () fail. press anykey to continue.......".
I paste the code here, to seek help from anyone who knows Winsock, many thanks.

#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
void main() {
  
    WSADATA wsaData;
    int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );
    if ( iResult != NO_ERROR )
        printf("Error at WSAStartup()\n");
    
    SOCKET server;
    server = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );
    if ( server == INVALID_SOCKET ) {
        printf( "Error at socket(): %ld\n", WSAGetLastError() );
        WSACleanup();
        return;
    }
   
    sockaddr_in service;
    service.sin_family = AF_INET;
    service.sin_addr.s_addr = inet_addr( "127.0.0.1" );
    service.sin_port = htons( 27015 );
    if ( bind( server, (SOCKADDR*) &service, sizeof(service) ) == SOCKET_ERROR ) {
        printf( "bind() failed.\n" );
        closesocket(server); 
        return;
    }
    
 
    if ( listen( server, 1 ) == SOCKET_ERROR )
        printf( "Error listening on socket.\n");
  
    SOCKET AcceptSocket;
    printf( "Waiting for a client to connect...\n" );
    while (1) {
        AcceptSocket = SOCKET_ERROR;
        while ( AcceptSocket == SOCKET_ERROR ) {
            AcceptSocket = accept( server, NULL, NULL );
        }
        printf( "Client Connected.\n");
        server = AcceptSocket; 
        break;
    }
    
 
    int bytesSent;
    int bytesRecv=SOCKET_ERROR;
    char sendbuf[32] = "Server: Sending Data.";
    char recvbuf[32] = "";
    
    bytesRecv = recv( server, recvbuf, 32, 0 );
    printf( "Bytes Recv: %ld\n", bytesRecv );
    
    bytesSent = send( server, sendbuf, strlen(sendbuf), 0 );
    printf( "Bytes Sent: %ld\n", bytesSent );
    return;
}