Dear Christian, Would it be possible to skip the first iterator-callback if the callbackcontains "size=0" data, but the multipart is not empty. First callback - skipped because "upload-name" has data:MHD_PostDataIterator( cls, kind=MHD_POSTDATA_KIND, key="upload- name", filename="video.mp4", content_type="video/mp4", transfer_encoding=nullptr, data=..., off=0, size=0 ); Second call:MHD_PostDataIterator( cls, kind=MHD_POSTDATA_KIND, key="upload-name", filename="video.mp4", content_type="video/mp4", transfer_encoding=nullptr, data=..., off=0, size=64724 ); Best wishes from ViennaMarkus
-------- Weitergeleitete Nachricht --------Von: Christian Grothoff < groth...@gnunet.org>Antwort an: libmicrohttpd development and user mailinglist <libmicrohttpd@gnu.org>An: libmicrohttpd@gnu.orgBetreff: Re: [libmicrohttpd] Parsing multipart/formdataDatum: Tue, 21 Apr 2020 16:25:53 +0200 Hi Markus, Let me get this straight:The scenario you are concerned with is to distinguish the case thatthere are possibly two variables with *identical* key / content-type*values* and the first one has an 'empty' value, and the second case isthat there is just one value and you got called with size=0 merelybecause of 'unfortunate' network traffic. Is that right? If so, I don't think the current API allows you to _reliably_distinguish those two cases (cmp'ing pointers is an unreliable hack, asyou say). It's an interesting corner case, which we may want to documentand/or fix in the v2.0 API -- unless someone has a good proposal for howto do address this case in a binary-API compatible way. Happy hacking! Christian On 4/21/20 4:17 PM, Markus Doppelbauer wrote: > Hello, > Is there a reliable way to detect 'continution' in > 'MHD_PostDataIterator()'?To detect the beginning of a new variable I > have tested: 'off == 0'.But this is not reliable. It is a rare case > but sometimes the iteratorstops rightbefore the first content-byte > (if helpful I will provide a testcase): > first call:MHD_PostDataIterator( cls, kind=MHD_POSTDATA_KIND, > key="upload-name",filename="video.mp4", content_type="video/mp4", > transfer_encoding=nullptr,data=..., off=0, size=0 ); > second call:MHD_PostDataIterator( cls, kind=MHD_POSTDATA_KIND, > key="upload-name",filename="video.mp4", content_type="video/mp4", > transfer_encoding=nullptr,data=..., off=0, size=64724 ); > Pointer comparision of 'key', 'filename' and 'content_type' works - > butis also not 100% reliable.'malloc()' could provide the same > address. > Thanks a lotMarkus
