HttpPost using libCurl

By Sathya Priya R

23 Mar 2015 04:52 English 6 Replies

Hi,

I'm trying to use libcurl api's to post data to server (HttpPost).

Tried with this sample code :

CURL *curl;
CURLcode res;

      curl_global_init(CURL_GLOBAL_ALL);
      curl = curl_easy_init();
      curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
      curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com/hello-world");
      curl_easy_setopt(curl, CURLOPT_POST, 1);
      curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "foo=bar&foz=baz");
      res = curl_easy_perform(curl);
      curl_easy_cleanup(curl);

Problems:

1. res = CURLE_COULDNT_RESOLVE_HOST always

2. Also "curl_easy_perform" takes very long time to perform the request - nearly 1 minute!

Kindly help me solving the issues.

Thanks,

Sathya Priya

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Responses

6 Replies

Alex Ashirov

23 Mar 2015 07:00

Hi,

You can also try to send libcurl related questions in their mailing list:

http://curl.haxx.se/mail/list.cgi?list=curl-library

Hopefully, they will be able to answer the questions quickly.

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colin Rao

23 Mar 2015 19:28

seems it is the curl can't find the host of you web app, in other words it's can't get the ip address from the DNS server by the domain name www.example.com/

try more, make sure that you can open the link in explorer http://www.example.com/hello-world

ping www.example.com in command, get it's ip address, and use the ip address to replace www.example.com in your source code.

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Alex Ashirov colin Rao

24 Mar 2015 02:49

Hi,

I have tried the code snippet above and I received the same error code. I tried on the both Emulator and Z1 device. Results were the same. I also, tried HHTP Post sample downloaded from the Libcurl site with the same result. I tried different URLs. I was able to ping them and I was able to open them in browser, but curl_easy_perform() returned CURLE_COULDNT_RESOLVE_HOST anyway. I am not a curl expert and I can’t say for sure if it’s our mistake or curl doesn’t work correctly.