HTTP communication: Get image JSON format and convert to download

#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. Connect to the server

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);//server port number

SADDR.SIN_ADDR.S_ADDR = inet_addr ("119.146.74.48");//server address

int ret = connect (sockfd, struct sockaddr*) &saddr, sizeof (SADDR));

if (Ret < 0)

{

Perror ("Connect Fail");

}

2. Sending an HTTP request

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; Get valid picture data after a picture data terminator

File*file = fopen (pic, "w+");

Fwrite (q, recvsize-(q-p), 1, file);

fclose (file);

Free (p);

}

int main (void)

{

1. Connect to the server

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);//server port number

SADDR.SIN_ADDR.S_ADDR = inet_addr ("14.215.177.185");//server address

int ret = connect (sockfd, struct sockaddr*) &saddr, sizeof (SADDR));

if (Ret < 0)

{

Perror ("Connect Fail");

}

2. Sending an HTTP request

Write (SOCKFD, Http_req, strlen (http_req));

3. Receiving server response data

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));

}

Remove HTTP Headers

Q = strstr (P, "\r\n\r\n") +4;

Q = strstr (q, "{");

Remove the data tail

Char *tmp = strstr (q, "}]}\r") +3;

*tmp = ' + ';

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

JSON data parsing

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);

Creating threads to download data

pthread_t id = 0;

Pthread_create (&id, NULL, Download_run, (void *) picobj->valuestring);

Usleep (10000);

Pthread_detach (ID);

}

Free (p);

GetChar ();

GetChar ();//In order to not let the main program exit, affect the thread download picture

return 0;

}

HTTP communication: Get picture JSON format and convert download