Am 22.05.2012 um 20:47 schrieb noru...@me.com:

> Hello,
> 
> ... but I don't know how to combine C++/Qt with the Objective-C/C++.

Use Objective-C++ (*.mm) code to mix C++ code with Objective-C (limitations 
apply, google for "Objective-C++").

Use the qmake OBJECTIVE_SOURCES variable to add your *.mm sources and have them 
compiled and linked with the rest of your C++ Qt project.

That let's you easily call Objective-C APIs and even instantiate Objective-C 
classes from within C++.

Haven't read everything, but I guess this here shows you concrete code:

  http://el-tramo.be/blog/mixing-cocoa-and-qt/

> I also read that Qt provides a mechanism for In-App purchases, but I think 
> this is only for android, isn't it?

Haven't heard about that, but maybe its more a Nokia store thing?

On the other hand it's easy to write plugins with Qt and load them dynamically 
at runtime. Any runtime "Did the user pay for this?" checks beyond that are off 
course highly "App Store dependent".

Cheers,
> 
  Oliver
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