TCP网络编程的基本流程

TCP网络编程的基本流程

对于服务端,通常为以下流程:

1. 调用socket函数创建socket
2. 调用bind函数将socket绑定到某个IP和端口上
3. 调用listen开始监听
4. 当有客户端请求连接上来时,调用accept函数接受连接,产生一个新的socket
5. 基于新产生的socket调用send或recv函数,开始与客户端进行数据交流
6. 通信结束后,调用close函数关闭套接字

对于客户端,通常为以下流程:

1. 调用socket函数创建客户端socket

2. 调用connect函数尝试连接服务器

3. 连接成功后调用send或recv函数,开始与服务器进行通信

4. 通信结束后,调用close函数关闭socket

服务端代码实现如下:

#include
#include
#include
#include
#include
#include
#pragma clang diagnostic push
#pragma ide diagnostic ignored "EndlessLoop"
using std::cout;
using std::endl;
int main(int argc,char * argv[])
{//1.create socketint listenfd &＃61; socket(AF_INET,SOCK_STREAM,0);if(listenfd &＃61;&＃61; -1){cout<<"create listenfd failed"<<endl;return -1;}//2.Initialize server addressstruct sockaddr_in bindaddr{};bindaddr.sin_family &＃61;AF_INET;bindaddr.sin_addr.s_addr &＃61; htonl(INADDR_ANY);bindaddr.sin_port&＃61; htons(3000);if (bind(listenfd,(struct sockaddr*) &bindaddr, sizeof(bindaddr)) &＃61;&＃61; -1){cout<<"bind listen socket failed!"<<endl;return -1;}//3.Start listeningif(listen(listenfd,SOMAXCONN) &＃61;&＃61; -1){cout<<"listen error"<<endl;return -1;}while (true){sockaddr_in clientaddr{};socklen_t clientaddrlen &＃61; sizeof(clientaddr);//4.accept client connectint clientfd &＃61; accept(listenfd,(struct sockaddr*)&clientaddr,&clientaddrlen);if (clientfd !&＃61; -1){//5.Receive data from the clientchar recvBuf[32]&＃61;{0};int ret &＃61; recv(clientfd,recvBuf,32,0);if (ret > 0){cout<<"Receive data from the client:"<<recvBuf<<endl;ret &＃61; send(clientfd,recvBuf, strlen(recvBuf),0);if(ret !&＃61; strlen(recvBuf))cout<<"send failed"<<endl;elsecout<<"send successfully"<<endl;}else{cout<<"Receive data error"<<endl;}close(clientfd);}}//7.close listenclose(listenfd);return 0;
}
#pragma clang diagnostic pop


客户端代码

#include
#include
#include
#include
#include
#include #define SERVER_ADDRESS "127.0.0.1"
#define SERVER_PORT 3000
#define SEND_DATA "helloworld"int main(int argc,char *argv[])
{//1.create socketint clientfd &＃61; socket(AF_INET,SOCK_STREAM,0);if(clientfd &＃61;&＃61; -1){std::cout<<"create socket failed"<<std::endl;return -1;}//2.connect serversockaddr_in serveraddr;serveraddr.sin_family &＃61; AF_INET;serveraddr.sin_addr.s_addr&＃61; inet_addr(SERVER_ADDRESS);serveraddr.sin_port&＃61; htons(SERVER_PORT);if (connect(clientfd,(struct sockaddr*) &serveraddr, sizeof(serveraddr)) &＃61;&＃61; -1){std::cout<<"connect socket error"<<std::endl;return -1;}//3. send data to serverint ret&＃61; send(clientfd,SEND_DATA, strlen(SEND_DATA),0);if (ret !&＃61; strlen(SEND_DATA)){std::cout<<"send data failed"<<std::endl;return -1;}std::cout<<"successfully"<<SEND_DATA<<std::endl;//4.recv data from serverchar recvBuf[32] &＃61;{0};ret &＃61; recv(clientfd,recvBuf,32,0);if(ret >0){std::cout<<"sucessfully"<<std::endl;} else{std::cout<<"failed"<<recvBuf<<std::endl;}//5.close socketclose(clientfd);return 0;
}


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