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How do you upload a file using Curl and HTTP using C++ on Linux?

Posted on 2007-04-05
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Last Modified: 2012-08-14
I want to upload an xml file,  using HTTP and Curl and C++. I am using libcurl on linux.  I have no trouble downloading using curl, but uploading always gives me a problem.  I get a segmentation fault whenever I call curl_easy_perform. Can somebody please post some sample code on how to upload a file to an http server. Thanks!!
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Question by:mromeo
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5 Comments
 
LVL 53

Expert Comment

by:Infinity08
ID: 18858014
What do you mean by uploading ? Do you mean POST the XML request to an HTTP server, and wait for the XML response ?

Can you show the coded that causes the segmentation fault ?
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Author Comment

by:mromeo
ID: 18858217
No, I want to upload a file to a server.  I'll wait for a response saying it got the file.  Here is my code:

CURL *hCurl = NULL;
...
  CURLcode cc;
   if (!hCurl)
   {
      cc = curl_global_init(CURL_GLOBAL_ALL);
      hCurl = curl_easy_init();
   }

   if (hCurl)
   {
      FILE *fp = fopen("mbrTest.xml", "r");
      char error_buffer[1024];

      if (fp)
      {
         char *url = "http://1.0.0.2/cgi-bin/r50.cgi/ols-mbr.p";

         cc = curl_easy_setopt(hCurl, CURLOPT_URL, url);
         cc = curl_easy_setopt(hCurl, CURLOPT_UPLOAD, 1);
         cc = curl_easy_setopt(hCurl, CURLOPT_VERBOSE, 1);
         cc = curl_easy_setopt(hCurl, CURLOPT_INFILE, "mbrTest.xml");  
         cc = curl_easy_setopt(hCurl, CURLOPT_INFILESIZE, 104);  
         cc = curl_easy_setopt(hCurl, CURLOPT_ERRORBUFFER, &error_buffer);

         cc = curl_easy_perform(hCurl);
         printf("curl easy perform completed -- CURL code = %d\n", cc);

         fclose(fp);
      }

      curl_easy_cleanup(hCurl);
      curl_global_cleanup();
   }
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LVL 53

Accepted Solution

by:
Infinity08 earned 500 total points
ID: 18858322
Did you take a look at this example (HTTP PUT) :

        http://curl.haxx.se/lxr/source/docs/examples/httpput.c
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LVL 53

Assisted Solution

by:Infinity08
Infinity08 earned 500 total points
ID: 18858375
More precisely, try using :

      curl_easy_setopt(curl, CURLOPT_READDATA, fp);

instead of :

       cc = curl_easy_setopt(hCurl, CURLOPT_INFILE, "mbrTest.xml");



Also use :

       curl_easy_setopt(curl, CURLOPT_PUT, TRUE);

to choose HTTP PUT
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Author Comment

by:mromeo
ID: 18858766
Both of those worked! Thanks!!
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