修改三个宏定义即可

#define HOST “192.168.1.133” //主机
#define PORT 80 //端口
#define POST_DATA “post_test=444&post_val=555” //内容

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>#define HOST "192.168.1.133"
#define PORT 80
#define POST_DATA "post_test=444&post_val=555"
#define POST_DATA_LENGTH strlen(POST_DATA)int main() {int sockfd;struct sockaddr_in server_addr;struct hostent *server;// 创建套接字sockfd = socket(AF_INET, SOCK_STREAM, 0);if (sockfd < 0) {perror("Error opening socket");exit(1);}// 获取服务器的IP地址server = gethostbyname(HOST);if (server == NULL) {fprintf(stderr,"Error: no such host\n");exit(1);}// 设置服务器地址结构bzero((char *) &server_addr, sizeof(server_addr));server_addr.sin_family = AF_INET;bcopy((char *)server->h_addr, (char *)&server_addr.sin_addr.s_addr, server->h_length);server_addr.sin_port = htons(PORT);// 连接到服务器if (connect(sockfd, (struct sockaddr *) &server_addr, sizeof(server_addr)) < 0) {perror("Error connecting");exit(1);}// 构造HTTP请求char request[1024];sprintf(request, "POST /set HTTP/1.1\r\n""Host: %s\r\n""Content-Type: application/x-www-form-urlencoded\r\n""Content-Length: %zu\r\n""\r\n""%s", HOST, POST_DATA_LENGTH, POST_DATA);// 发送HTTP请求if (send(sockfd, request, strlen(request), 0) < 0) {perror("Error sending request");exit(1);}// 接收并显示服务器的响应char response[4096];int bytes_received = recv(sockfd, response, sizeof(response), 0);if (bytes_received < 0) {perror("Error receiving response");exit(1);}printf("Response from server:\n");fwrite(response, 1, bytes_received, stdout);// 关闭套接字close(sockfd);return 0;
}