socket编程实例TCP

Socket编程简单实例，TCP链接，服务器返回客户端发送内容！

客户端代码：tcpclient.cpp

#include <stdio.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#include <fcntl.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#define trace printf#define MAX_BUFFER_SIZE 128int main(int argc, char* argv[]){int port = 0;if(argc != 4){trace("params error !\n");trace("example:10.12.2.250 8000 hello\n");return 0;}for(int ii = 0; ii < argc; ii++){trace("***param %d: %s\n", ii + 1, argv[ii]);}port = atoi(argv[2]);int sock = -1, ret = -1, recv_len = 0;struct sockaddr_in server;memset(&server, 0, sizeof(server));server.sin_family = AF_INET;server.sin_port = htons(port);server.sin_addr.s_addr = inet_addr(argv[1]);if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){trace("create socket error !\n");return 0;}if(connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0){trace("connect server error !\n");close(sock);return 0;}trace("connect server success !\n");char buffer[MAX_BUFFER_SIZE] = {0};strncpy(buffer, argv[3], sizeof(buffer) - 1);if((send(sock, buffer, strlen(buffer) + 1, 0)) == -1){trace("send buffer error !\n");close(sock);return 0;}trace("send buffer success !\n");memset(buffer, 0, sizeof(buffer));if((recv_len = recv(sock, buffer, sizeof(buffer), 0)) != -1){trace("recv buffer success len = %d!\n", recv_len);trace("server respond:%s\n", buffer);}else{trace("recv buffer error !\n");}trace("close sock success !\n");close(sock);return 0;}

服务器代码：tcpserver.cpp

#include <stdio.h>#include <unistd.h>#include <string.h>#include <stdlib.h>#include <fcntl.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#define trace printf#define MAX_BUFFER_SIZE 128int main(int argc, char* argv[]){int port = 0;if(argc != 2){trace("params error , need assign port!\n");return 0;}port = atoi(argv[1]);int sock = -1, sock_connect = -1;struct sockaddr_in server;memset(&server, 0, sizeof(server));server.sin_family = AF_INET;server.sin_port = htons(port);server.sin_addr.s_addr = htonl(INADDR_ANY);if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){trace("create socket error !\n");return 0;}if(bind(sock, (struct sockaddr*)&server, sizeof(server)) < 0){trace("socket bind error !\n");close(sock);return -1;}if(listen(sock, 10) != 0){trace("socket listen error !\n");close(sock);return -1;}trace("socket wait connect......\n");int recv_len = 0;char buffer[MAX_BUFFER_SIZE] = {0};while((sock_connect = accept(sock, NULL, NULL)) != -1){if((recv_len = recv(sock_connect, buffer, sizeof(buffer), 0)) != -1){trace("recv buffer success len = %d!\n", recv_len);trace("recv contents:%s\n", buffer);if((send(sock_connect, buffer, recv_len, 0)) == -1){trace("send buffer error !\n");}}close(sock_connect);sock_connect = -1;trace("\nsocket wait connect......\n");}return 0;}

运行结果：

server：./tcpserver 8000

client：./tcpclient 10.12.2.250 8000 hello

***param 1: ./tcpclient
***param 2: 10.12.2.250
***param 3: 9898
***param 4: hello
connect server success !
send buffer success !
recv buffer success len = 6!
server respond:hello
close sock success !

server：

socket wait connect......
recv buffer success len = 6!
recv contents:hello