原文作者：aircraft
原文地址：https://www.cnblogs.com/DOMLX/p/9601511.html
c++ 网络编程（一）TCP/UDP 入门级客户端与服务端交互代码
windows下：
TCP：
一.服务端代码
#define _WINSOCK_DEPRECATED_NO_WARNINGS#include <WinSock2.h>#include <stdio.h>#include <stdlib.h>#pragma comment(lib, "ws2_32.lib")void main()
{
WSADATA wsaData; int port = 5099; char buf[] = "Server: hello, I am a server....."; if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
{
printf("Failed to load Winsock"); return;
} //创建用于监听的套接字
SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);
SOCKADDR_IN addrSrv;
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(port); //1024以上的端口号
addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY); int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv, sizeof(SOCKADDR_IN)); if (retVal == SOCKET_ERROR){
printf("Failed bind:%d\n", WSAGetLastError()); return;
} if (listen(sockSrv, 10) == SOCKET_ERROR){
printf("Listen failed:%d", WSAGetLastError()); return;
}
SOCKADDR_IN addrClient; int len = sizeof(SOCKADDR);//等待客户请求到来
SOCKET sockConn = accept(sockSrv, (SOCKADDR *)&addrClient, &len); if (sockConn == SOCKET_ERROR){
printf("Accept failed:%d", WSAGetLastError());
//break;
}
printf("Accept client IP:[%s]\n", inet_ntoa(addrClient.sin_addr)); //发送数据
int iSend = send(sockConn, buf, sizeof(buf), 0); if (iSend == SOCKET_ERROR){
printf("send failed");
// break;
} char recvBuf[100];
memset(recvBuf, 0, sizeof(recvBuf)); // //接收数据
recv(sockConn, recvBuf, sizeof(recvBuf), 0);
printf("%s\n", recvBuf);
closesocket(sockConn);
closesocket(sockSrv);
WSACleanup();
system("pause");
}
二.客户端代码
#define _WINSOCK_DEPRECATED_NO_WARNINGS#include <WinSock2.h>#include <stdio.h>#pragma comment(lib, "ws2_32.lib")void main()
{ //加载套接字 WSADATA wsaData; char buff[1024];
memset(buff, 0, sizeof(buff)); if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
{
printf("Failed to load Winsock"); return;
}
SOCKADDR_IN addrSrv;
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(5099);
addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); //创建套接字
SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0); if (SOCKET_ERROR == sockClient){
printf("Socket() error:%d", WSAGetLastError()); return;
} //向服务器发出连接请求
if (connect(sockClient, (struct sockaddr*)&addrSrv, sizeof(addrSrv)) == INVALID_SOCKET){
printf("Connect failed:%d", WSAGetLastError()); return;
} else
{ //接收数据
recv(sockClient, buff, sizeof(buff), 0);
printf("%s\n", buff);
} //发送数据
char *buffSend = "hello, this is a Client....";
send(sockClient, buffSend, strlen(buffSend) + 1, 0);
printf("%d", strlen(buffSend) + 1); //关闭套接字 closesocket(sockClient);
WSACleanup();
system("pause");
}
怕某些小白不懂我详细说说运行，运行时先开服务端，在开客户端运行 ，也就是开两个cPP文件分别运行，两个cpp各是一个小项目代码 不要放在一起
这里的127.0.0.1是代表本地的地址，你们想实现两机交互就用对方的地址。
代码很简单，想要直接拿去，接下来直接看运行结果：
UDP：
windows下UDP服务端代码
#include<winsock2.h>#include<stdio.h>#include<string.h>#include<iostream>using namespace std;#pragma comment(lib,"ws2_32.lib")#define BUFFER_SIZE 1024int main(){ WSADATA WSAData; char receBuf[BUFFER_SIZE]; char Response[] = ""; if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0) { printf("初始化失败"); exit(1); } SOCKET sockServer = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (sockServer == INVALID_SOCKET) { printf("Failed socket() \n"); return 0; } SOCKADDR_IN addr_Server; //服务器的地址等信息 addr_Server.sin_family = AF_INET; addr_Server.sin_port = htons(4567); addr_Server.sin_addr.S_un.S_addr = INADDR_ANY; if (bind(sockServer, (SOCKADDR*)&addr_Server, sizeof(addr_Server)) == SOCKET_ERROR) { //服务器与本地地址绑定 printf("Failed socket() %d \n", WSAGetLastError()); return 0; } SOCKADDR_IN addr_Clt; int fromlen = sizeof(SOCKADDR); while (true) { int last = recvfrom(sockServer, receBuf, 1024, 0, (SOCKADDR*)&addr_Clt, &fromlen); if (last>0) { //判断接收到的数据是否为空 receBuf[last] = '\0';//给字符数组加一个'\0'，表示结束了。不然输出有乱码 if (strcmp(receBuf, "bye") == 0) { cout << " 客户端不跟我聊天了..." << endl; closesocket(sockServer); return 0; } else { printf("接收到数据（%s）：%s\n", inet_ntoa(addr_Clt.sin_addr), receBuf); } } cout << "回复客户端消息:"; cin >> Response; //给客户端回复消息 sendto(sockServer, Response, strlen(Response), 0, (SOCKADDR*)&addr_Clt, sizeof(SOCKADDR)); } closesocket(sockServer); WSACleanup(); return 0;} |
windows下UDP客户端端代码
#include<winsock2.h>#include<stdio.h>#include<string.h>#include<iostream>using namespace std;#pragma comment(lib,"ws2_32.lib")# define BUFFER_SIZE 1024 //缓冲区大小int main()
{
SOCKET sock_Client; //客户端用于通信的Socket WSADATA WSAData;
char receBuf[BUFFER_SIZE]; //发送数据的缓冲区 char sendBuf[BUFFER_SIZE]; //接受数据的缓冲区 if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0)
{
printf("初始化失败!");
return -1;
}
//初始化 sock_Client = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);//创建客户端用于通信的Socket SOCKADDR_IN addr_server; //服务器的地址数据结构 addr_server.sin_family = AF_INET;
addr_server.sin_port = htons(4567);//端口号为4567 addr_server.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); //127.0.0.1为本电脑IP地址 SOCKADDR_IN sock;
int len = sizeof(sock);
while (true)
{
cout << "请输入要传送的数据:";
cin >> sendBuf;
sendto(sock_Client, sendBuf, strlen(sendBuf), 0, (SOCKADDR*)&addr_server, sizeof(SOCKADDR));
//int last=recv(sock_Client, receBuf, strlen(receBuf), 0); // (调用recv和recvfrom都可以) int last = recvfrom(sock_Client, receBuf, strlen(receBuf), 0, (SOCKADDR*)&sock, &len);
if (last>0)
{
receBuf[last] = '\0'; //给字符数组加一个'\0'，表示结束了。不然输出有乱码 if (strcmp(receBuf, "bye") == 0)
{
cout << "服务器不跟我聊天了..." << endl;//当服务器发来bye时，关闭socket closesocket(sock_Client);
break;
}
else {
printf("接收到数据：%s\n", receBuf);
}
}
}
closesocket(sock_Client);
WSACleanup();
return 0;
}
注：以下代码需在LINUX下运行 gcc什么的都可以
LINUX下：
一.TCP
linux下TCP服务端代码：
#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>
int main(int argc, char *argv[])
{ int server_sockfd;//服务器端套接字 int client_sockfd;//客户端套接字 int len; struct sockaddr_in my_addr; //服务器网络地址结构体 struct sockaddr_in remote_addr; //客户端网络地址结构体 int sin_size; char buf[BUFSIZ]; //数据传送的缓冲区
memset(&my_addr,0,sizeof(my_addr)); //数据初始化--清零
my_addr.sin_family=AF_INET; //设置为IP通信
my_addr.sin_addr.s_addr=INADDR_ANY;//服务器IP地址--允许连接到所有本地地址上
my_addr.sin_port=htons(8000); //服务器端口号
/*创建服务器端套接字--IPv4协议，面向连接通信，TCP协议*/ if((server_sockfd=socket(PF_INET,SOCK_STREAM,0))<0)
{
perror("socket error"); return 1;
}
/*将套接字绑定到服务器的网络地址上*/ if(bind(server_sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0)
{
perror("bind error"); return 1;
}
/*监听连接请求--监听队列长度为5*/ if(listen(server_sockfd,5)<0)
{
perror("listen error"); return 1;
};
sin_size=sizeof(struct sockaddr_in);
/*等待客户端连接请求到达*/ if((client_sockfd=accept(server_sockfd,(struct sockaddr *)&remote_addr,&sin_size))<0)
{
perror("accept error"); return 1;
}
printf("accept client %s/n",inet_ntoa(remote_addr.sin_addr));
len=send(client_sockfd,"Welcome to my server/n",21,0);//发送欢迎信息
/*接收客户端的数据并将其发送给客户端--recv返回接收到的字节数，send返回发送的字节数*/ while((len=recv(client_sockfd,buf,BUFSIZ,0))>0))
{
buf[len]='/0';
printf("%s/n",buf); if(send(client_sockfd,buf,len,0)<0)
{
perror("write error"); return 1;
}
}
/*关闭套接字*/
close(client_sockfd);
close(server_sockfd);
return 0;
}
linux下TCP客户端代码：
#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>
int main(int argc, char *argv[])
{ int client_sockfd; int len; struct sockaddr_in remote_addr; //服务器端网络地址结构体 char buf[BUFSIZ]; //数据传送的缓冲区
memset(&remote_addr,0,sizeof(remote_addr)); //数据初始化--清零
remote_addr.sin_family=AF_INET; //设置为IP通信
remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");//服务器IP地址
remote_addr.sin_port=htons(8000); //服务器端口号
/*创建客户端套接字--IPv4协议，面向连接通信，TCP协议*/ if((client_sockfd=socket(PF_INET,SOCK_STREAM,0))<0)
{
perror("socket error"); return 1;
}
/*将套接字绑定到服务器的网络地址上*/ if(connect(client_sockfd,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr))<0)
{
perror("connect error"); return 1;
}
printf("connected to server/n");
len=recv(client_sockfd,buf,BUFSIZ,0);//接收服务器端信息
buf[len]='/0';
printf("%s",buf); //打印服务器端信息
/*循环的发送接收信息并打印接收信息（可以按需发送）--recv返回接收到的字节数，send返回发送的字节数*/ while(1)
{
printf("Enter string to send:");
scanf("%s",buf); if(!strcmp(buf,"quit") break;
len=send(client_sockfd,buf,strlen(buf),0);
len=recv(client_sockfd,buf,BUFSIZ,0);
buf[len]='/0';
printf("received:%s/n",buf);
}
/*关闭套接字*/
close(client_sockfd);
return 0;
}
二.UDP
linux下UDP服务端代码
#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>
int main(int argc, char *argv[])
{ int server_sockfd; int len; struct sockaddr_in my_addr; //服务器网络地址结构体 struct sockaddr_in remote_addr; //客户端网络地址结构体 int sin_size; char buf[BUFSIZ]; //数据传送的缓冲区
memset(&my_addr,0,sizeof(my_addr)); //数据初始化--清零
my_addr.sin_family=AF_INET; //设置为IP通信
my_addr.sin_addr.s_addr=INADDR_ANY;//服务器IP地址--允许连接到所有本地地址上
my_addr.sin_port=htons(8000); //服务器端口号
/*创建服务器端套接字--IPv4协议，面向无连接通信，UDP协议*/ if((server_sockfd=socket(PF_INET,SOCK_DGRAM,0))<0)
{
perror("socket error"); return 1;
}
/*将套接字绑定到服务器的网络地址上*/ if (bind(server_sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0)
{
perror("bind error"); return 1;
}
sin_size=sizeof(struct sockaddr_in);
printf("waiting for a packet.../n");
/*接收客户端的数据并将其发送给客户端--recvfrom是无连接的*/ if((len=recvfrom(server_sockfd,buf,BUFSIZ,0,(struct sockaddr *)&remote_addr,&sin_size))<0)
{
perror("recvfrom error");
return 1;
}
printf("received packet from %s:/n",inet_ntoa(remote_addr.sin_addr));
buf[len]='/0';
printf("contents: %s/n",buf);
/*关闭套接字*/
close(server_sockfd);
return 0;
}
linux下UDP客户端代码
#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>
int main(int argc, char *argv[])
{ int client_sockfd; int len; struct sockaddr_in remote_addr; //服务器端网络地址结构体 int sin_size; char buf[BUFSIZ]; //数据传送的缓冲区
memset(&remote_addr,0,sizeof(remote_addr)); //数据初始化--清零
remote_addr.sin_family=AF_INET; //设置为IP通信
remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");//服务器IP地址
remote_addr.sin_port=htons(8000); //服务器端口号
/*创建客户端套接字--IPv4协议，面向无连接通信，UDP协议*/ if((client_sockfd=socket(PF_INET,SOCK_DGRAM,0))<0)
{
perror("socket error"); return 1;
}
strcpy(buf,"This is a test message"); // 发送的内容
printf("sending: '%s'/n",buf);
sin_size=sizeof(struct sockaddr_in);
/*向服务器发送数据包*/ if((len=sendto(client_sockfd,buf,strlen(buf),0,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr)))<0)
{
perror("recvfrom");
return 1;
}
/*关闭套接字*/
close(client_sockfd);
return 0;
}
最后说一句啦。本网络编程入门系列博客是连载学习的，有兴趣的可以看我博客其他篇。。。。
参考博客：https://blog.csdn.net/u012234115/article/details/54142273
参考博客：https://www.cnblogs.com/zwj-199306231519/p/9067618.html
随时随地看视频
