[Mac CS3] Accessing boss classes and global variables

You are welcome.

Thanks Peter
Ur Post Helps me a lot

Thanks To All

Thanks solved my problem right away.
I needed that extern declaration!

I do not know what happened there but let's expand my example with some more C/C++ constructs:

MyClass.h

#ifndef MYCLASS_H

#define MYCLASS_H



class MyClass {

  public:

    void HelloWorld();

};



extern MyClass gMyObject;



#endif  /* MYCLASS_H */

MyClass.cpp

#ifndef MYCLASS_H

#include MyClass.h"

#endif



MyClass gMyObject;



MyClass::HelloWorld()

{

    ...

}

MyWork1.cpp

#ifndef MYCLASS_H

#include MyClass.h"

#endif



void MyWork1()

{

    gMyObject.HelloWorld();

}

MyWork2.cpp

#ifndef MYCLASS_H

#include MyClass.h"

#endif



void MyWork2()

{

    gMyObject.HelloWorld();

}

Also, make sure all my .cpp files are added to your project or makefile so they can be compiled and linked properly.

Good luck!

Hi Ian,
Ya that is a simple C++ stuff.But why It is giving Multiple declaration error i dont know i hav declared same as peter told.
ya but when i set

b solution explorer->properties->linker->commandline and set /FORCE:MULTIPLE

i am not getting any errors.

Hi Andres,
I defined all my class same as peter sample i defined

b extern MyClass gMyObject; in MyClass.h

and

b MyClass gMyObject; in MyClass.cpp

but when i iam including (#include "MyClass.h" ) in multiple files i am getting that error multiple declaration found

But it is working fine when i am including it at only one place.why?

Thanks u All.

You are probably defining gMyObject in "MyClass.h" instead of declaring it. You probably have a line like:
MyClass gMyObject;
instead of:
extern MyClass gMyObject;

The difference is that the first line creates a new "gMyObject" each time you include "MyClass.h" in another .cpp file, the second only **declares** that that variable exists. You need to use the second form in the ".h" file.

Additionally, you need to use the first form in exactly one .cpp file that includes the .h file, so that the variable is actually created. This is really basic C/C++ stuff.

Regards, Eugenio Andres - http://www.expertosinformaticos.com

You are can work in a standard C++ way for global variables - a plugin is effectively a .dll (not sure how it would work between plugins though). Your link error is a genuine link error not caused by the CS3/Windows environment - probably something in MyClass.h.

Ian

Hi Peter,
I am also trying for global in Indesign CS3[WIN] but if i am using globals in more than one class in my application like

b MyWork.cpp

#include "MyClass.h"

gMyObject.HelloWorld();

b MyWork1.cpp

#include "MyClass.h"

gMyObject.HelloWorld();

it is giving errorLNK2005:that it is already defined .multiple declaration found

how to get out from that error can u help me.i am working on Indesign CS3 windows

If you are referring "global variable" as in C/C++ sense, the following works for me:

MyClass.h

class MyClass {
public:
void HelloWorld();
};

extern MyClass gMyObject;

MyClass.cpp

MyClass gMyObject;

MyClass::HellWorld() {
.....
}

MyWork.cpp

#include "MyClass.h"

gMyObject.HelloWorld();