Hi all,

Could be nice if any one can clarify the following doubts.

I am trying to do the HTTP POST [only post ] of a file which can vary the
size from 10 MB to 5 GB and have
written the following reading call back in c++.

READSIZE is 1024*1024

static size_t dataRead_Callback(void *ptr, size_t size, size_t nmemb, void
*input)
  {
   if(size*nmemb < 1)
   return 0;

   std::ifstream * is= static_cast<std::ifstream*>(input);
   is->read((char *)ptr,READ_SIZE);
   string s((char*)ptr);
   cout<<"Sending..."<<s<<" size is "<<is->gcount()<<endl;
   if( is->eof()) { cout<<endl<<"Reaching eof "<<endl;
   return -1;
   }
   return is->gcount();

}

from main function, i have called the following

curl_easy_setopt(handler, CURLOPT_READFUNCTION, dataRead_Callback);

curl_easy_setopt(handler, CURLOPT_POSTFIELDSIZE_LARGE, fileSize);

curl_easy_setopt(handler, CURLOPT_READDATA, &fobj);

where fobj is the ifstream object.

1. Would like to know what the size and nmemb exactly mean in
dataRead_Callback?

2. Do we need to allocate the memory explictly for 'ptr' in
dataRead_Callback ()?

Thanks.
Received on 2008-01-29