使用c语言写一个客户端/服务器通信程序
时间: 2023-09-03 15:10:05 浏览: 60
好的,这是一个简单的客户端/服务器通信程序的C代码示例:
服务器端:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define PORT 8888
#define MAXLINE 1024
int main(int argc, char *argv[]) {
int server_fd, new_socket, valread;
struct sockaddr_in address;
int opt = 1;
int addrlen = sizeof(address);
char buffer[MAXLINE] = {0};
char *hello = "Hello from server";
// 创建套接字
if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
// 设置套接字选项,允许地址重用
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT,
&opt, sizeof(opt))) {
perror("setsockopt");
exit(EXIT_FAILURE);
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(PORT);
// 绑定套接字到端口
if (bind(server_fd, (struct sockaddr *)&address,
sizeof(address)) < 0) {
perror("bind failed");
exit(EXIT_FAILURE);
}
// 监听套接字
if (listen(server_fd, 3) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
// 接受新的连接请求
if ((new_socket = accept(server_fd, (struct sockaddr *)&address,
(socklen_t *)&addrlen)) < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
// 从客户端读取数据
valread = read(new_socket, buffer, MAXLINE);
printf("Client: %s\n", buffer);
// 向客户端发送消息
send(new_socket, hello, strlen(hello), 0);
printf("Hello message sent\n");
return 0;
}
```
客户端:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define PORT 8888
#define MAXLINE 1024
int main(int argc, char *argv[]) {
int sock = 0, valread;
struct sockaddr_in serv_addr;
char *hello = "Hello from client";
char buffer[MAXLINE] = {0};
// 创建套接字
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
printf("\n Socket creation error \n");
return -1;
}
memset(&serv_addr, '0', sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(PORT);
// 将IPv4地址从点分十进制转换为二进制格式
if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
printf("\nInvalid address/ Address not supported \n");
return -1;
}
// 连接服务器
if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
printf("\nConnection Failed \n");
return -1;
}
// 向服务器发送消息
send(sock, hello, strlen(hello), 0);
printf("Hello message sent\n");
// 从服务器读取响应
valread = read(sock, buffer, MAXLINE);
printf("Server: %s\n", buffer);
return 0;
}
```
这个程序中,服务器在本地监听端口8888,客户端连接到服务器后向其发送“Hello from client”消息,服务器接收到消息后回复“Hello from server”消息,客户端接收到服务器的消息并打印在屏幕上。你可以根据需要修改代码。