c ++ libcurl json rest [英] c++ libcurl json rest

问题描述

我试图从libcurl的C ++下载REST网页下载一个json文件。
下面的代码如果我去网页，但它不下载，如果我尝试访问的json ....的工作。

I am trying to download a json file from a REST webpage in C++ with libcurl. The following code works if I go to the webpage but it doesnt download if I try to access the json ....

我认为它应该是一个很容易修复，但我找不到任何参考这个...

I think it should be an easy fix but I cant find any reference to this ...

如果我去网页，它打开json但这个代码只返回text / html; charset = utf-8

If I go to webpage it opens the json but this code only returns text/html; charset=utf-8

CURL *curl;
CURLcode res;
    struct curl_slist *headers=NULL; // init to NULL is important 
    headers = curl_slist_append(headers, "Accept: application/json");   

curl = curl_easy_init();
if(curl) {

    curl_easy_setopt(curl, CURLOPT_URL, "http://web.com/api/json/123");
            curl_easy_setopt(curl, CURLOPT_HTTPGET,1);
    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
    //curl_easy_setopt(curl, CURLOPT_URL, "http://web.com/123.html");//this works!!!
    res = curl_easy_perform(curl);

    if(CURLE_OK == res) {
        char *ct;
        /* ask for the content-type */
        res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);
        if((CURLE_OK == res) && ct)
            printf("We received Content-Type: %s\n", ct);
    }
}
/* always cleanup */ 
curl_easy_cleanup(curl);

推荐答案

std::string ServerContent::DownloadJSON(std::string URL)
{   
    CURL *curl;
    CURLcode res;
    struct curl_slist *headers=NULL; // init to NULL is important 
    std::ostringstream oss;
    curl_slist_append(headers, "Accept: application/json");  
    curl_slist_append( headers, "Content-Type: application/json");
    curl_slist_append( headers, "charsets: utf-8"); 
    curl = curl_easy_init();

    if (curl) 
    {
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
        curl_easy_setopt(curl, CURLOPT_URL, URL.c_str());
        curl_easy_setopt(curl, CURLOPT_HTTPGET,1); 
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); 
        curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,writer);
        res = curl_easy_perform(curl);

        if (CURLE_OK == res) 
        { 
            char *ct;         
            res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);
            if((CURLE_OK == res) && ct)
                return *DownloadedResponse;
        }
    }

}


static std::string *DownloadedResponse;

static int writer(char *data, size_t size, size_t nmemb, std::string *buffer_in)
{

    // Is there anything in the buffer?  
    if (buffer_in != NULL)  
    {
        // Append the data to the buffer    
        buffer_in->append(data, size * nmemb);

        // How much did we write?   
        DownloadedResponse = buffer_in;

        return size * nmemb;  
    }

    return 0;

}   

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