iOS Problem when Importing C++ in Objective C

[ta3ban4]

Hi All ,
I'm fairly new to Iphone development. I created View based application and copied C ++ class that i have created a while back to use. First i did drag my h/cpp files to the Classes folder. Changed MyViewController.m File Type to soucecode.cpp.objcpp then #include "eCharBuffer" it compiles fine , but when i try to instantiate/creat an object eCharBuffer mybuff (100,true); it give me the following error ;

Undefined symbols:
"eCharBuffer::eCharBuffer(bool)", referenced from:
-[MapViewController .cxx_construct] in MapViewController.o
"eCharBuffer::~eCharBuffer()", referenced from:
-[MapViewController .cxx_destruct] in MapViewController.o

Unless i define it as a pointer eCharBuffer *mybuff which i dont want to use.

Any Idea Why and how i can fix . I have a lot of C++ code that i dont want to port to Objective C

Thanks In Advace

 

[Guiyon]

Try changing your file extension. Objective-C++ files use the extension "mm", not "cpp" or "objcpp".

 

[ta3ban4]

Try changing your file extension. Objective-C++ files use the extension "mm", not "cpp" or "objcpp".

I have changed eCharBuffer.cpp to .mm also the class MapViewController.m to .mm . Still getting the same Error

Thanks

 

[Soulstorm]

I have changed eCharBuffer.cpp to .mm also the class MapViewController.m to .mm . Still getting the same Error

Thanks

Change ALL .m files to .mm. Even those who don't appear to have a C++ class or file included.

 

[Guiyon]

I would double check your code and make sure you are actually implementing the two methods you are referencing. Also make sure that your "eCharBuffer.cpp" is being included in the compilation

 

[PhoneyDeveloper]

There is a build setting called 'Call C++ Default Ctors/Dtors in ObjectiveC' that you may need to be turned on.

Is your c++ class that is causing the problem an ivar of an Obj-C class or are you allocating it on the stack?

 

[ta3ban4]

I have been looking at Xcode Build System doc on Apple Dev site made me a but more confused. I did set " Call C++ Default Ctors/Dtors in ObjectiveC" under build/code generation with no success . Not sure what "ivar of an Obj-C class or are you allocating it on the stack" . I'm attaching the h/mm"cpp" files a simple byte buffer class.

Thanks for the help Guys

 

[PhoneyDeveloper]

"ivar of an Obj-C class or are you allocating it on the stack"

This line

eCharBuffer mybuff (100,true);

Is an object of your c++ class an instance variable of an Objective-C class?

Are you allocating an instance of your c++ class on the stack?

 

[lloyddean]

Unless i define it as a pointer eCharBuffer *mybuff which i dont want to use.

You can't. It's a requirement of ObjC++ that ObjC classes can not contain instances of C++ objects - only pointers to instances.

 

[ta3ban4]

This line



>>Is an object of your c++ class an instance variable of an Objective-C class?
>>Are you allocating an instance of your c++ class on the stack?

Simply an instance variable of eCharBuff class , which when i tried to initialize in my MapViewController.m class ,myBuff (100, true) was giving me the that error. I tried eCharBuff *mybuff and it did compile. Hope that did help

Thanks
Merry Christmas everyone

 

[ta3ban4]

i got it to compile when using eCharBuff *mybuff , but im getting the following warning
warning: no rule to process file warning: no rule to process file '$(PROJECT_DIR)/Classes/eCharBuffer.mm' of type sourcecode.cpp for architecture i386




Any idea ,
Thanks for the help