C - libcurl - How to get dltotal without using the CURLOPT_XFERINFOFUNCTION

Question

I am using the libcurl multi interface and I need to know how much data is being sent for each request. I would rather not use the CURLOPT_XFERINFOFUNCTION because it gets called a lot and I only need to know the dltotal while I am in the CURLOPT_WRITEFUNCTION callback. I want to clean up the existing easy handle and malloc'd data while I am still in the write callback once all the data has been received. Is there a function I can call that will return the total amount of data that is being sent for a particular easy handle?

I tried using curl_easy_getinfo() with CURLINFO_SIZE_DOWNLOAD and it always returned 0 . I also tried CURLINFO_CONTENT_LENGTH_DOWNLOAD which also always returned 0 . I was calling this from within the CURLOPT_WRITEFUNCTION callback.

Answer 1

The reason you get zeroes back from those calls is probably because the size simply isn't known before-hand.

But let me also alert you that "I want to clean up the existing easy handle and malloc'd data while I am still in the write callback" sounds like a disaster waiting to happen. You really should not cleanup the handle from within the callback.