HTTP通信:获取图片JSON格式并转化下载

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <stdio.h>
#include <linux/in.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "cJSON.h"

//http://image.baidu.com/channel/listjson?pn=0&rn=30&tag1=%E7%BE%8E%E5%A5%B3&tag2=%E5%85%A8%E9%83%A8&ie=utf8

#define HTTP_REQ "GET /channel/listjson?pn=0&rn=3&tag1=%E7%BE%8E%E5%A5%B3&tag2=%E5%85%A8%E9%83%A8&ie=utf8 \
HTTP/1.1\r\nHost: image.baidu.com\r\nConnection: close\r\n\r\n"

/* http://b.hiphotos.baidu.com/image/pic/item/908fa0ec08fa513d17b6a2ea386d55fbb2fbd9e2.jpg http://a.hiphotos.baidu.com/image/pic/item/7acb0a46f21fbe091bd6251369600c338744ad29.jpg http://h.hiphotos.baidu.com/image/pic/item/730e0cf3d7ca7bcb55c3132bbc096b63f624a87e.jpg */

#define HTTP_REQ_PIC "GET /image/pic/item/%s HTTP/1.1\r\nHost: %s\r\nConnection: close\r\n\r\n"

void *download_run(void *arg)
{
char *t = (char *)arg;
char buf[strlen(t)+1];
memcpy(buf, t, strlen(t)+1);

char www[64]= {0};
char pic[128] = {0};

sscanf(buf, "http://%[^/]/image/pic/item/%s", www, pic);

printf("%s---%s\n", www, pic);

char requstbuffer[1024] = {0};
sprintf(requstbuffer, HTTP_REQ_PIC, pic, www);

//1.连接服务器
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0)
{
return NULL;
}

struct sockaddr_in saddr;
bzero(&saddr, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(80);//服务器端口号
saddr.sin_addr.s_addr = inet_addr("119.146.74.48");//服务器地址

int ret = connect(sockfd, (struct sockaddr*)&saddr, sizeof(saddr));
if(ret < 0)
{
perror("connect fail");
}

//2.发送http请求
write(sockfd, requstbuffer, strlen(requstbuffer));

char buffer[1024]={0};
char *p = malloc(1024*300);
char *q = p;
unsigned int recvsize = 0;
while(1)
{
int ret = read(sockfd, buffer, 1024);
if(ret <=0 )break;
memcpy(q, buffer,ret);
q+=ret;
recvsize += ret;
memset(buffer, 0, sizeof(buffer));
}

q = strstr(p, "\r\n\r\n")+4; //获取图片数据结束符后面的有效图片数据

FILE*file = fopen(pic, "w+");
fwrite(q, recvsize-(q-p), 1, file);
fclose(file);

free(p);

}

int main(void)
{
//1.连接服务器
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0)
{
return -1;
}

struct sockaddr_in saddr;
bzero(&saddr, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(80);//服务器端口号
saddr.sin_addr.s_addr = inet_addr("14.215.177.185");//服务器地址

int ret = connect(sockfd, (struct sockaddr*)&saddr, sizeof(saddr));
if(ret < 0)
{
perror("connect fail");
}

//2.发送http请求
write(sockfd, HTTP_REQ, strlen(HTTP_REQ));

//3.接收服务器应答数据
char buffer[1024]={0};
char *p = malloc(2048*30+1200);
char *q = p;
while(1)
{
int ret = read(sockfd, buffer, 1024);
if(ret <=0 )break;
memcpy(q, buffer,ret);
q+=ret;
memset(buffer, 0, sizeof(buffer));
}

//去掉http头
q = strstr(p, "\r\n\r\n")+4;
q = strstr(q, "{");

//去掉数据尾巴
char *tmp = strstr(q, "}]}\r")+3;
*tmp = '\0';

printf("%s\n", q);

//JSON数据解析
cJSON *obj = cJSON_Parse(q);
cJSON *array = cJSON_GetObjectItem(obj, "data");

int size = cJSON_GetArraySize(array);
int i=0;
for(i=0;i<size-1; i++)
{
cJSON *aobj = cJSON_GetArrayItem(array, i);
cJSON *picObj = cJSON_GetObjectItem(aobj, "image_url");

//printf("%s\n", picObj->valuestring);

//创建线程下载数据
pthread_t id = 0;
pthread_create(&id, NULL, download_run, (void *)picObj->valuestring);
usleep(10000);
pthread_detach(id);
}
free(p);

getchar();
getchar();//此两处为了不让主程序退出,影响线程下载图片

return 0;
}