windows socket 编程实例--TCP

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本文通过两个实例展示了如何使用Winsock实现TCP客户端与服务器之间的简单通信过程。包括服务器监听端口、接收客户端消息并反馈，以及客户端连接服务器、发送消息并接收服务器响应。

实例一；

客户端向服务器发信息, 收到后打印一下,再回发. 客户端收到信息后打印.【来自网络】
---------------这是服务器的-------------------
#include "afxmt.h"
#include "winsock2.h"
#pragma     comment(lib,"WS2_32.LIB")

int bufi;

class mserver{

private:
      SOCKET ssock,csock;
      sockaddr_in saddr,caddr;
      int len;
      char buf[4096];

public:
      mserver(){

      }
      mserver(int port,int maxclient){
          saddr.sin_family=AF_INET;
          saddr.sin_port=htons(port);
          saddr.sin_addr.s_addr=INADDR_ANY;
          ssock=socket(AF_INET,SOCK_STREAM,0);
          if(ssock==INVALID_SOCKET){
              printf("build socket error\n");
          }
          if(bind(ssock,(struct sockaddr*)&saddr,sizeof(saddr))==SOCKET_ERROR){
              printf("socket bind fail\n");
          }
          len=sizeof(caddr);
      }

      void close(){
          closesocket(ssock);
          closesocket(csock);
      }

      void beginlisten(){
          if(listen(ssock,10)==SOCKET_ERROR){
              printf("listen fail\n");
          }
      }

      void maccept(){
          sockaddr a;
          csock=accept(ssock,(struct sockaddr*)&caddr,&len);
          if(csock==INVALID_SOCKET){
              printf("accept fail : %d\n",WSAGetLastError());
            
          }
          printf("client from %s connected\n",inet_ntoa(caddr.sin_addr));
      }

      int receive(){
          memset(buf,0,4096);
          if(recv(csock,buf,4096,0)==SOCKET_ERROR){
              return 0;
          }
          printf("message received : %s\n",buf);
          send(csock,buf,4096,0);
          return 1;
      }
    
};

int main()
{
      WSADATA wsaData;
      if (WSAStartup(MAKEWORD(2,1),&wsaData)){
           printf("Winsock initializing fail\n");
           WSACleanup();
           return 0;
      }
      mserver s(12345,10);
      s.beginlisten();
      s.maccept();
      while(s.receive());
      s.close();
      WSACleanup();
      return 0;
}

----------------这是客户端的-------------------

#include "stdio.h"
#include "afxmt.h"
#include "winsock2.h"
#pragma     comment(lib,"WS2_32.LIB")


class mclient{
private:
      SOCKET sock;
      sockaddr_in saddr;
      int len;
      char buf[4096];
public:
      mclient(){
          sock=socket(AF_INET,SOCK_STREAM,0);
          len=sizeof(saddr);
      }

      bool mconnect(char* addr,int port){
          saddr.sin_family=AF_INET;
          saddr.sin_port=htons(port);
          saddr.sin_addr.s_addr=inet_addr(addr);
          if(connect(sock,(struct sockaddr*)&saddr,len)==SOCKET_ERROR){
              printf("connect fail : %d",WSAGetLastError());
              return false;
          }
          return true;
      }

      void close(){
          closesocket(sock);
      }

      void msend(char* mes){
          send(sock,mes,strlen(mes),0);
      }

      bool receive(){
          memset(buf,0,4096);
          if(recv(sock,buf,4096,0)==SOCKET_ERROR){
              return false;
          }
          else{
              printf("received from server : %s\n",buf);
              return true;
          }
      }

};


int main()
{
      WSADATA wsaData;
      if (WSAStartup(MAKEWORD(2,1),&wsaData)){
           printf("Winsock initializing fail\n");
           WSACleanup();
           return 0;
      }
      mclient a;
      if(!a.mconnect("172.18.48.7",12345)){
          return 0;
      }
      char buf[1024];
      while(scanf("%s",buf)){
          if(strcmp(buf,"quit")==0){
              break;
          }
          a.msend(buf);
          a.receive();

      }
      a.close();
      WSACleanup();
      return 0;
}

实例2；

---------------这是服务器的-------------------

#include <stdio.h>  
#include <winsock2.h>  
  
#pragma comment(lib,"ws2_32.lib")  
  
  
#define BUFLEN 1024  
  
int main()  
{  
    SOCKET serversoc;  
    SOCKET clientsoc;  
    SOCKADDR_IN serveraddr;  
    SOCKADDR_IN clientaddr;  
    char buf[BUFLEN];  
    int len;  
  
    WSADATA wsa;  
    WSAStartup(MAKEWORD(1,1),&wsa); //initial Ws2_32.dll by a process  
    if((serversoc = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) <= 0) //create a tcp socket  
    {  
        printf("Create socket fail!\n");  
        return -1;  
    }  
      
    serveraddr.sin_family = AF_INET;  
    serveraddr.sin_port = htons(9102);  
    serveraddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);  
  
    if(bind(serversoc, (SOCKADDR *)&serveraddr, sizeof(serveraddr)) != 0)  
    {  
        printf("Bind fail!\n");  
        return -1;  
    }  
      
    //start listen, maximum length of the queue of pending connections is 1  
    printf("Start listen...\n");  
    if(listen(serversoc, 1) != 0)  
    {  
        printf("Listen fail!\n");  
        return -1;  
    }  
  
    len = sizeof(SOCKADDR_IN);  
      
  
    //waiting for connecting  
    if((clientsoc = accept(serversoc, (SOCKADDR *)&clientaddr, &len))<=0)  
    {  
        printf("Accept fail!\n");  
        return -1;  
    }  
    printf("Connected\n");  
    while(1)  
    {  
        //waiting for data receive  
        if(recv(clientsoc, buf, BUFLEN, 0) <= 0)   
        {  
            //some error occur  
            printf("Close connection\n");  
            closesocket(clientsoc);  
            break;  
        }  
        printf("%s\n",buf);  
    }  
      
    WSACleanup(); //clean up Ws2_32.dll   
    return 0;  
}

----------------这是客户端的-------------------

#include <stdio.h>  
#include <winsock2.h>  
  
#pragma comment(lib,"ws2_32.lib")  
  
  
int main()  
{  
    SOCKET soc;  
    SOCKADDR_IN serveraddr;  
    SOCKADDR_IN clientaddr;  
    unsigned char buf[1024];  
  
    WSADATA wsa;  
    WSAStartup(MAKEWORD(1,1),&wsa); //initial Ws2_32.dll by a process  
  
    if((soc = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) <= 0)   //create a tcp socket  
    {  
        printf("Create socket fail!\n");  
        return -1;  
    }  
  
    serveraddr.sin_family = AF_INET;  
    serveraddr.sin_port = htons(9102);  
    serveraddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");  
  
    //connect to server  
    printf("Try to connect...\n");  
    if(connect(soc, (SOCKADDR *)&serveraddr, sizeof(serveraddr)) != 0)  
    {  
        printf("Connect fail!\n");  
        return -1;  
    }  
    printf("Connected\n");  
    while(1)  
    {  
        scanf("%s", buf);  
        //send to server  
        if(send(soc, buf, strlen(buf)+1, 0)<=0)  
        {  
            printf("Error!\n");  
        }  
    }  
  
    WSACleanup(); //clean up Ws2_32.dll   
    return 0;  
}