How to Call a C++ Method in Objective-C

Question

I have C++ files: C.cpp and C.h

//C.h #ifndef __ThreeMoreOpenCV__SourceC__ #define __ThreeMoreOpenCV__SourceC__ #include <iostream> class C { public: static void Cmethod (); }; #endif //C.cpp #include "SourceC.h" using namespace std; void Cmethod() { printf("ff"); }

Also I have Wrapper.h/.mm

//Wrapper.h #import <Foundation/Foundation.h> @interface CVWrapper : NSObject +(void)returnCmethod; @end //Wrapper.mm #import "Wrapper.h" #import "C.h" @implementation CVWrapper +(void)returnCmethod { C::Cmethod(); } @end

I have no idea but i'm getting an error like:

"C::Cmethod()", referenced from: +[Wrapper returnCmethod] in Wrapper.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation).

Can anybody tell me what is correct way to call function?

Edited the title since it was extremely misleading. Also, I would recommend re-naming your 'C' class to something more descriptive. — Mike D
– Mike D, Commented Mar 24, 2013 at 20:11

Aaron Golden · Accepted Answer · 2013-03-24 19:57:45Z

You haven't actually implemented the Cmethod function in your C class. You need to implement it with C:: in the function header, like:

void C::Cmethod() { printf("ff"); }

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