Pure C code, how to call a method in Object-C?

If that.
1, OBJC call C functions very easily.
2, C how callback OBJC? How to OBJC class pointer to C?
Reply:
Same, the objc object passed as a parameter of type pointer to c function like
Reply:

quote 1 floor darkdong reply:

same, the objc object passed as a parameter of type pointer to c function like

C source file is not recognized objc object pointer, if the header files into objc bunch of errors occur.
Reply:

cited two floor M_ChangGong reply:

quote 1 floor darkdong response: the same, the objc object passed as a parameter of type pointer to c function like
C source file is not recognized objc object pointer, if the header files into objc bunch of errors occur.

In the. M write c function
Reply:

3rd floor darkdong reply quote:

2F M_ChangGong reply quote: quote 1 floor darkdong response: the same, the objc object as a parameter of type pointer c function like
passedC source file is not recognized objc object pointer, if the header files into objc bunch of errors occur.
In the. M write c function

Try, now C code in a static library are. C file.