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How to save settings (and user settings) in a cross-platform application?

I am working on a desktop GUI application that should run natively on Windows, Mac OS X, and Linux. What is the preferred way to save preferences in a cross-platform application? I am using C ++, but the question (and its answers) must be valid for any originally compiled language. (Solutions for dynamic languages ​​and Java can be seen here .)

My research so far tells me that there are at least two strategies:
(A) Use OS-specific API settings functions.
(B) Save the settings in a file in the appropriate (specific OS) folder.

Consider method (A): I believe that this NSUserDefaultsis the correct method for Mac OS X. On Windows systems, I write to the registry through RegOpenKeyEx. But some questions arise: is there a comparable and portable Linux API for this? Is a Windows registry entry a really reliable solution?

To keep things simple, I tend to follow method (B). Thus, I just have OS-specific code to get the appropriate directory where I can store my data in the format I selected. On Windows, I found out SHGetFolderPath(or SHGetKnownFolderPathfor the latest Windows systems) and that CSIDL_LOCAL_APPDATAis the way to go. On Mac computers, an NSSearchPathForDirectoriesInDomainsAPI call should do the same; it is an Objective-C API, although it complicates the situation. Finally, for a version of Linux using getenv("HOME")(and getpwuid()as a fallback solution) is recommended.

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Linux ~/.fltk/{vendor}/{application}.prefs, {vendor} {application} - , Fl_Preferences. .

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