Calling an Obj-C method from a C++ class, how?

FROM : Rolf Nilsson
DATE : Thu Oct 07 15:17:48 2004

Hi,

My app has a Cocoa GUI but most of the code is C++.

My problem is how to call an Obj-C method from a C++ class.


This is what I do:

When I create my C++ object in my Cocoa method, I supply a pointer to
the Cocoa class:


@implementation MyController

- (void)someCocoaMethod
{
   SomeCPPClass  *p = new SomeCPPClass(self);
}


- (void) aCocoaMethodWithOneArgument:(int)theArgument;

- (void) aCocoaMethodWithTwoArguments:(int *)pAnIntPointer
                                   anIntValue:(int) anIntValue;

@end



in my C++ class I want to be able to call either of the two methods
aCocoaMethodWithOneArgument or aCocoaMethodWithTwoArguments


class SomeCPPClass
{
public:

SomeCPPClass(MyController *pMyControllerCocoaObj) {
m_pMyControllerCocoaObj = pMyControllerCocoaObj;  }

void foo();

protected:
   MyController *m_pMyControllerCocoaObj;

}

// here I want to call (send a message to ) the Obj-C method
void SomeCPPClass::foo()
{
   int * pAnIntPointer;
   int anIntValue;

............
other code here
............


// this works for a method with one argument but there may be a better
way?
   [ (id)m_pMyControllerCocoaObj
performSelector:@selector(aCocoaMethodWithOneArgument:) withObject:
(id) pAnIntPointer];    

}


But, I can't find out how to call the method with two arguments?


Thanks for any help,
Rolf