Does it prohibited calling classic C function from Objective-C++ class method body?

问题:

I have experienced some strange behavior of Objective-C++. I have an Objective-C++ class, and it calls a classic C function in a method body. But linker cannot find the C function.

I described the problem here: Xcode print symbol not found for my C function which used in Objective-C method body

I solved the problem by changing Objective-C++ class to Objective-C class, but the question is still remained. Does it prohibited calling C function in Objective-C++ class?

回答1:

You need to make sure that the C functions are declared

extern "C" 

in the appropriate .h file.

The common way of doing this is:

// // foo.h //  #ifndef __FOO_H__ #define __FOO_H__  #ifdef __cplusplus extern "C" { #endif  // ... your interface here - normal C function declarations etc ...  #ifdef __cplusplus } #endif  #endif 

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