I have been searching for days to find an Http Client in C++ that I can use. I am assisting in a research group involving camera recording based on sensor detection and am responsible for making the interface with the cameras. I have some work that was done before I joined, but it is all in java. I really need something to help get my foot in the door. If I could connect to the camera, login, and download an image, I'd have a good starting point. I'm not sure how the authentication works, but the java implementation used a method addBasicAuthentication (in this class http://www.innovation.ch/java/HTTPClient/api/HTTPClient/AuthorizationInfo.html). If anyone could help me get started with this, I'd really appreciate it.
hazmatt 0 Newbie Poster
Salem 5,248 Posting Sage
hazmatt 0 Newbie Poster
Thanks for the reply. I have install curl, and found a program to download a single file, but that's it. I don't know what to do for anything else, particularly for authentication.
Salem 5,248 Posting Sage
Well you write a program which uses the library.
Short of suggesting you go up a level and say grab the source code for say 'wget', which will add a lot of stuff not particularly interesting to you, I dunno what to suggest.
There isn't an easy answer except get in there and start doing lots of reading and working things out.
hazmatt 0 Newbie Poster
Fair enough. Any particular place you suggest I start? Tutorial, man pages, documentation? Anything specific would be great.
Salem 5,248 Posting Sage
If you've never done any network programming at all, begin with http://beej.us/guide/bgnet/
For the HTTP spec, read this - http://www.w3.org/Protocols/rfc2616/rfc2616.html
For any kind of network debugging, get http://www.wireshark.org/
All protocols involve sending lots of messages back and forth, and messing up any one of them will break things.
For example, if a normal desktop browser works, then use wireshark to trace the message interactions of the browser, then try to mimic that in your own code.
curlpp might help as well.
hazmatt 0 Newbie Poster
Packet sniffing was the best suggestion ever. I could not get curl's httpauth option working, but once I had all the headers, I figured out how to use the curlopt_httpheader option to set the headers being sent and could do authorization directly in the header. Thanks for your help.
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