C语言网络编程：医疗健康行业中的网络应用实践

// 客户端代码
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    struct sockaddr_in servaddr;
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    servaddr.sin_port = htons(PORT);
    
    if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
        perror("Connect");
        return 1;
    }
    
    // 发送患者信息请求
    char *request = "patient_id=1001";
    send(sockfd, request, strlen(request), 0);
    
    // 接收患者信息
    char *response = malloc(1024);
    recv(sockfd, response, 1024, 0);
    printf("Received patient information: %s\n", response);
    
    close(sockfd);
    return 0;
}

// 服务器代码
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <arpa/inet.h>

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    struct sockaddr_in serveraddr;
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = INADDR_ANY;
    serveraddr.sin_port = htons(PORT);
    
    if (bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0) {
        perror("Bind");
        return 1;
    }
    
    if (listen(sockfd, SOMAXCONN) < 0) {
        perror("Listen");
        return 1;
    }
    
    while (1) {
        struct sockaddr_storage clientaddr;
        socklen_t addrlen = sizeof(clientaddr);
        int newsockfd = accept(sockfd, (struct sockaddr *)&clientaddr, &addrlen);
        if (newsockfd < 0) {
            perror("Accept");
            continue;
        }
        
        char *request = malloc(1024);
        recv(newsockfd, request, 1024, 0);
        printf("Received request: %s\n", request);
        
        // 根据患者 ID 从数据库中获取患者信息
        char *response = "patient_name=John Doe";
        send(newsockfd, response, strlen(response), 0);
        
        close(newsockfd);
    }
    
    close(sockfd);
    return 0;
}