objective c - passing function reference to a C pointer type, C will invoke the function -

i have simple question i.e. how can pass objective-c function reference c function pointer c can invoke function.

edit: sorry not providing sample source here is:

- (void)init {       clibstructure clibobject;       clibobject.on_work_done = &cworkdone; } 

the function point on_work_done have signature in c

static void cworkdone(const char *workinfo); 

whereas in objective-c signature made

- (void) workdonewithstatusmessage:(const char *message); 

now want point clib.on_work_done pointer objective-c function, if point standard c function works.

in short, can't. not directly.

a method call combination of target, object message, , selector identifies method call.

you need bundle somehow. blocks easy enough. pure c apis, can typically done context pointer or it.

given posted no code, no examples, none of api used, , none of details c api itself, providing details difficult.