Hello.

I'm using libcurl to post a message using http in one url and I'm using
a callback to receive the answer.

My application has memory leaks, and I'm having a lot of difficulties to
know why. I'm using libcurl 7.12.1 for RedHat.

Here is the method that I have created to make the post:

int

CWebClient :: httpPost(string &url, string &postData, string &answer)

{

  int pos, len;

  string command;

  CURLcode res;

  char* resp;

  CURL* httpHandle;

  answer = "";

  // Init httpHandle

  httpHandle=curl_easy_init();

  // Set the options for transfer

  curl_easy_setopt (httpHandle, CURLOPT_URL, url.c_str ());

  curl_easy_setopt (httpHandle, CURLOPT_POST, 1);

  curl_easy_setopt (httpHandle, CURLOPT_POSTFIELDS, postData.c_str());

  curl_easy_setopt (httpHandle, CURLOPT_NOSIGNAL, 1);

  curl_easy_setopt (httpHandle, CURLOPT_TIMEOUT, 4);

  curl_easy_setopt (httpHandle, CURLOPT_CONNECTTIMEOUT, 4);

  if(progress)

    curl_easy_setopt(httpHandle, CURLOPT_NOPROGRESS,false);

  curl_easy_setopt(httpHandle, CURLOPT_WRITEFUNCTION,
&CWebClient::HTTPWriteCallback);

  curl_easy_setopt(httpHandle, CURLOPT_WRITEDATA, &resp);

  // Start the transfer

  res = curl_easy_perform (httpHandle);

  if( CURLE_OK != res)

  {

    // Cleanup

    curl_easy_cleanup(httpHandle);

    return res;

  }

  for( unsigned int i = 0; i < strlen(resp); i++ )

    answer += resp[i];

  answer += (char)0x00;

  delete []resp;

  // Cleanup

  curl_easy_cleanup(httpHandle);

  return SENTOK;

}

and here is the callback that I'm using:

size_t

CWebClient::HTTPWriteCallback(void *ptr, size_t size, size_t memb, char*
&data)

{

  int nRealsize = size* memb;

  char* aux = (char*)ptr;

  //buffer data from ptr to data

  data = new char[nRealsize+1];

  for( unsigned int i = 0; i < nRealsize; i++ )

    data[i] = (char)aux[i];

  data[nRealsize] = (char)0x00;

  return nRealsize;

}

Is there something missing? I'm doing the

            curl_global_init (CURL_GLOBAL_NOTHING);

only once in the applicatuion startup and the

            curl_global_cleanup ();

when the application ends.

Thanks in advance for any help.

Raquel Vieira
Received on 2007-11-12