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I am very new to Objective-C.
I wan to call Objective-C methods from a C++ class defined in separate .cpp file.

I have used the same mechanism described in this question's answer by dreamlax (not the PIMPL one) http://stackoverflow.com/questions/1061005/calling-objective-c-method-from-c-method

But i am stuck at point how to call function int MyCPPClass::someMethod (void *objectiveCObject, void *aParameter); from CPP class with the parameters objectiveCObject.

Also can some one please explain how to call a C++ class functions from Objective-C Code with an Example.

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    I once wrote a very simple example of this as a response to someone's question. Maybe it will give you ideas: stackoverflow.com/questions/13236476/… Commented Nov 28, 2012 at 13:52
  • Thanks for the example, in your 'OCClass.mm' file at the end you have added C++ class implementation. can we move this implementation to separate C++ file? or it should be in that file only. Commented Nov 29, 2012 at 5:17
  • It needs to be in a .mm file because it uses Objective-C code as part of that implementation. I suppose it could be moved into its own file but my habit with O-C++ has been to connect the languages via one pair of classes and implement them together so that I have only one place to look for that code. Commented Nov 29, 2012 at 10:13

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You must use Objective-C++ in the file that does the call. To do so from Xcode, rename the file from Whatever.m to Whatever.mm. Then you can mix calls.

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