Is there a C++ cross platform key/value API or library for C++?

We want to persist some user settings int he GUI part of our code. I used to do Win32 programming exclusively and the typical way this was done was with registry settings.

I assume that this should be done with configuration files, but was wondering if there was a library 开发者_如何学运维or cross platform wrapper that made key/value pair persistence very easy.

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Qt's QSettings class handles this:

http://doc.qt.nokia.com/4.6/qsettings.html

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Boost.PropertyTree supports XML, JSON, INI config files.

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There is also JSON for a lighter alternative of XML. Lots of implementations on that page too.

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Qt 4 has a class for it, named QSettings. Looks exactly like what you need.

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Why not use an XML as the configuration file. Then you only have to find a cross platform XML library which is easier IMO. Here is a list of nice XML parsing solutions for C++.

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Old school Berkley DB comes to mind.

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Have a look at Tokyo Cabinet or at Embedded InnoDB.

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In the old days we used .ini files in windows. Here is a portable version of an ini file read/write library
It will work on Windows as well as Linux.