C++ streaming file upload with multi-part

Hi Experts,

Can someone point me to the best library that will do multi-part streaming uploads of a file in C++?  While the file streams, I need to have progress update callbacks.

Thank  you!
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evilrixSenior Software Engineer (Avast)Commented:
If you are referring to streaming a file over a transport protocol your best bet for all round flexibility and cross platform availability is libcurl.


It supports all major data transport protocols, including: DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, Telnet and TFTP

And is available for the following platforms: Solaris, NetBSD, FreeBSD, OpenBSD, Darwin, HPUX, IRIX, AIX, Tru64, Linux, UnixWare, HURD, Windows, Amiga, OS/2, BeOs, Mac OS X, Ultrix, QNX, OpenVMS, RISC OS, Novell NetWare, DOS

Progress callbacks are also supported.

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if you look for streaming at windows platform, you may look for MultipartFormDataStreamProvider class (managed c++).

see https://msdn.microsoft.com/en-us/library/system.net.http.multipartformdatastreamprovider%28v=vs.118%29.aspx

threadyAuthor Commented:
Thanks for your answers.  Libcurl might be a possibility for me.

Sara - I wish I could use that, but I'm in a native C++ app.  Definitely love the simplicity that c# offers...
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you can mix native c++ with managed c++ in a visual c++ project. that allows to use both worlds even to use a c# assembly from c++.

but surely libcurl is worth a try before.

threadyAuthor Commented:
I've never done that before - I've called C# from C++ but the opposite seems a little more intimidating for some reason...
threadyAuthor Commented:
evilrix, if you know of any code samples to do the multipart upload with libcurl (or anything else), that would be really helpful.
threadyAuthor Commented:
I'm thinking a little more in general now and wondering which path to take to enable REST calls as well, and facilitating future expansion in this area in our application.

We're using VS2008 still at work, so I think the C++ rest SDK might not be an option.  I also don't see how to do multipart form upload with this.

Any thoughts?
We're using VS2008 still at work, so I think the C++ rest SDK might not be an option.
you can develop a vs 2013 dll using the SDK and call them from vs2008 programs. if you keep the interface simple (or use shared memory to exchange data) there shouldn't be any bigger issues.

threadyAuthor Commented:
Great suggestion, thank you Sara!
threadyAuthor Commented:
libcurl it is.  Thanks evilrix!
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