HTTP-获取随机数

从聚合API获取随机数，并解析出随机数

/***************************************************************************
*
* 设计http程序，聚合API发送获取随机数的请求，使用JSON对随机数进行解析
* author：jindouliu2024@163.com 
* date：2025.5.22
*
* 		  
*
* Copyright (c)  2024-2025   jindouliu2024@163.com   All right Reserved
* *************************************************************************/

#include<stdio.h>
#include<time.h>
#include <unistd.h>
#include<string.h>
#include<errno.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include <unistd.h>
#include<netinet/udp.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include <pthread.h>
#include <netdb.h>
#include"cJSON.h"

#define PORT  80
#define DNS  "apis.juhe.cn"
#define KEY "   "//自己的秘钥


int main(int argc,char *argv[])
{
	char buf[512] = {0};
	char rcvbuf[1024] = {0};
	char *databuf = calloc(1,4096);
	if(databuf == NULL){
		printf("calloc error\n");
		return 1;
	}
	char *p = NULL;
	int temp = 0;
	struct hostent *host;
	//创建套接字文件
	int socket_fd = socket(AF_INET, SOCK_STREAM, 0);
	if(socket_fd == -1){
		fprintf(stderr,"socket error errno:%d,%s",errno,strerror(errno));
		return 1;
	}
	host = gethostbyname(DNS);
	if(host == NULL){
		fprintf(stderr,"gethostbyname error errno:%d,%s",errno,strerror(errno));
		return 2;
	}

	//绑定服务器的端口和地址
	struct sockaddr_in server;
	server.sin_family = AF_INET;
	server.sin_port = htons(PORT);
	server.sin_addr.s_addr =  ((struct in_addr *)(host->h_addr_list[0]))->s_addr;
	
	//申请连接
	int flag = connect(socket_fd,(struct sockaddr *)&server,sizeof(server));
	if(flag == -1){
		fprintf(stderr,"connect error errno:%d,%s",errno,strerror(errno));
		return 1;
	}
	
	//HTTP协议格式
	sprintf(buf,"GET http://apis.juhe.cn/fapig/pwdgenerator/generate?key=%s&len=4&t=3 "
		"HTTP/1.1\r\n"
		"Host:apis.juhe.cn\r\n"
		"Connection: close\r\n"
		"Content-Type:application/x-www-form-urlencoded\r\n"
		"\r\n",KEY);
	//双方建立连接
	send(socket_fd,buf,strlen(buf),0);
	int bytes = 0;
	//接收数据
	while((bytes =recv(socket_fd, rcvbuf, sizeof(rcvbuf) - 1, 0)) > 0){
		strcat(databuf,rcvbuf);

		bzero(rcvbuf,sizeof(rcvbuf));
	}
	char *newptr = strstr(databuf,"{");
	// 解析JSON数据
    cJSON *json = cJSON_Parse(newptr);
    printf("Parsed JSON:\n%s\n", cJSON_Print(json));
    cJSON *result = cJSON_GetObjectItem(json,"result");
    cJSON *content = cJSON_GetObjectItem(result,"content");
    printf("%s\n",content->valuestring);
    return 0;
}