How to return JSON with libcurl.net (C#)?

Question

I am trying to use libcurl.net to connect to a server and return the json from it. But instead of returning the JSON, it returns "CURLE_OK". Heres my code:

Curl.GlobalInit((int)CURLinitFlag.CURL_GLOBAL_WIN32);
Easy easy = new Easy();
var agent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)";
easy.SetOpt(CURLoption.CURLOPT_URL, string.Format("http://vikinglogue.com/api/get_posts/?page={0}", currentPage));
easy.SetOpt(CURLoption.CURLOPT_HTTPGET, 1);
easy.SetOpt(CURLoption.CURLOPT_USERAGENT, agent);
easy.SetOpt(CURLoption.CURLOPT_TRANSFERTEXT, 1);
var responce = easy.Perform();
MessageBox.Show(responce.ToString());
easy.Cleanup();

Anyone have any idea what I'm doing wrong here? Please don't suggest an answer using WebClient, because, I can't use it (not by choice). Thanks.

CodeCaster · Accepted Answer · 2015-04-08 15:51:52Z

You're probably expecting CURLOPT_TRANSFERTEXT to act like PHP's CURLOPT_RETURNTRANSFER. It doesn't, as the former is documented as "tells the library to use ASCII mode for ftp transfers", which is totally irrelevant in this case as it's an HTTP request.

See the EasyGet sample, you need to pass a callback to a write function:

public static void Main(String[] args)
{
    try {
        Curl.GlobalInit((int)CURLinitFlag.CURL_GLOBAL_ALL);

        Easy easy = new Easy();
        Easy.WriteFunction wf = new Easy.WriteFunction(OnWriteData);

        easy.SetOpt(CURLoption.CURLOPT_URL, args[0]);
        easy.SetOpt(CURLoption.CURLOPT_WRITEFUNCTION, wf);
        easy.Perform();
        easy.Cleanup();

        Curl.GlobalCleanup();
    }
    catch(Exception ex) {
        Console.WriteLine(ex);
    }
}

public static Int32 OnWriteData(Byte[] buf, Int32 size, Int32 nmemb,
    Object extraData)
{
    Console.Write(System.Text.Encoding.UTF8.GetString(buf));
    return size * nmemb;
}

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