C/C++ language-specific groups seem to have mostly evaporated in the past decade or so as other languages have become more popular in general.
Most of the sites I used to hang out on are no longer functioning.
http://www.cprogramming.com/ is still running, and is a good starting point.
Last I heard the #C channel on freenode IRC was still useable, but I can't check that directly at the moment.
StackOverflow is decent when you have reasonably specific questions, but it can be a bit of effort to wade through the voluminous content to find what you want.

For your specific project, there are some domain-specific communities that might offer pointers, suggestions, and code examples:
https://harbour.github.io/  An implementation of the Clipper system which compiles xBase code and supports multiple backends including dbf.
http://www.clicketyclick.dk/databases/xbase/format/index.html  The dbf file format documentation.
https://sourceforge.net/projects/dbase/  An existing (very small, possibly abandoned) dbf file library written in C with some C++ wrappers.
https://sourceforge.net/projects/xdb/  Another (definitely abandoned) xBase library in C++

Hopefully those help.

On 10/23/2016 08:20 AM, Keith Smith wrote:
> 
> Hi,
> 
> Looking for suggestions C/C++ user group / mailing list.
> 
> I have very little experience with C and would like to create some libraries for managing dBase files (.dbf).
> 
> Thank you in advance!!
> 
> Keith
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