随手写了一个简单的socket服务端和客户端_手写socket客户端-优快云博客

本文链接：https://blog.youkuaiyun.com/wscxr57/article/details/7804343

本文详细介绍了使用Winsock实现服务端与客户端通信的过程，包括服务端创建套接字、绑定、监听，以及客户端连接、接收和发送数据的方法。通过实例演示了如何在服务端接收客户端输入并响应。

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先开启服务端，在开启客户端。向服务端命令窗口输入字符，按ENTER键，则字符发送子客户端。之后客户端也可以发送字符至服务端。

服务端程序：

#include <WINSOCK2.H>
#include <iostream.h>

main()
{
SOCKET socknum, sendsocknum;                                                   //socket描述符
struct sockaddr_in serveraddr, clientaddr;                                    //服务器地址结构体
char* IPstring = "172.16.192.185";                                 //字符串形式的服务器IP地址
int IP;                                                           //32位整形IP地址
IP = inet_addr(IPstring);                                         //字符串形式的IP地址转换成32位整形IP地址
WSADATA wsaData;
    WORD version = MAKEWORD(2,0);
    WSAStartup(version,&wsaData);

WSASetLastError(963);
cout<<"WSAGetLastError="<<WSAGetLastError()<<endl;

socknum = socket(PF_INET,SOCK_STREAM,0); //创建一个套接字，并且返回描述符
if(SOCKET_ERROR == socknum)
{
exit(0);
}

memset(&serveraddr, 0, sizeof(struct sockaddr_in));

//填充服务器地址结构体的内容
serveraddr.sin_family = AF_INET;                                   //填充协议地址
    serveraddr.sin_addr.s_addr = IP;                            //填充IP地址
serveraddr.sin_port = htons(4000);                                 //填充端口号

//绑定到服务器的指定网络地址
int b;                             //当返回值为-1，说明绑定失败
b = bind(socknum, (struct sockaddr *)&serveraddr, sizeof(struct sockaddr_in));

//监听
int c , d=sizeof(clientaddr);                            //当返回值为-1，说明绑定失败
c = listen(socknum, 6);
   //若b=-1，c=-1，说明绑定和监听都失败
cout<<"socknum="<<socknum<<endl<<"b="<<b<<endl<<"c="<<c<<endl<<"IP="<<IP<<endl;
    sendsocknum = accept(socknum, (struct sockaddr *)&clientaddr,&d);
char SendBuffer[100];
char RevBuffer[100];
cout<<"客户端IP地址："<<inet_ntoa((clientaddr.sin_addr))<<endl;
while(1)
{
    cin>>SendBuffer;

send(sendsocknum, SendBuffer, strlen(SendBuffer), 0);
memset(SendBuffer, 0, 100);
// shutdown(sendsocknum, 1);
memset(RevBuffer, 0, 100);
recv(sendsocknum, RevBuffer, 100, 0);
cout<<RevBuffer<<endl;
}

while(1);
closesocket(sendsocknum);
WSACleanup();
}

客户端程序：

#include <WINSOCK2.H>
#include <iostream.h>

main()
{
SOCKET clientsocknum;
struct sockaddr_in serveraddr, clientaddr;
char *IPstring = "172.16.192.185";
int IP, b, len;
IP = inet_addr(IPstring);

WSADATA wsaData;
WORD version = MAKEWORD(2,0);
WSAStartup(version,&wsaData);

clientsocknum = socket(AF_INET,SOCK_STREAM,0);
memset(&serveraddr, 0, sizeof(struct sockaddr_in));
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr = IP;
serveraddr.sin_port = htons(4000);
b = connect(clientsocknum, (struct sockaddr *)&serveraddr, sizeof(struct sockaddr_in));

getsockname(clientsocknum, (sockaddr*)(&clientaddr),&len);
cout<<"本地地址："<<inet_ntoa(clientaddr.sin_addr)<<endl<<"本地端口:"<<htons(clientaddr.sin_port)<<endl;

cout<<"clientsocknum="<<clientsocknum<<endl<<"b="<<b<<endl;
char RecvBuffer[100];
char sendbuffer[100] ;
memset(RecvBuffer, 0, 100);
int recvnum;

while(1)
{

  recvnum = recv(clientsocknum, RecvBuffer, 100, 0);
  cout<<RecvBuffer<<endl;
  memset(RecvBuffer, 0, 100);

  cin>>sendbuffer;
  send(clientsocknum, sendbuffer, strlen(sendbuffer), 0);
  memset(sendbuffer, 0, 100);
}

closesocket(clientsocknum);
WSACleanup();

}