how to access a variable from another project in the current project

Hello...

I have two projects.. ProjA and ProjB.. ProjA is main executable project and ProjB is compiled into a .lib file and used in ProjA.

Now, there is a member in the main app file of ProjA called current_transformation.. I need to set or change current_transformation's value in ProjB depending on certain criteria..

How do i do that without copying all files from PrajB to ProjA..??

Thanks in advance

Hm....can't you just add a Get() and Set() function to the lib's class? I take it you have an instance of the class holding the variable in the other project?


If the lib isn't yours, and you're just given a lib and an h file, then it will be a problem unless the variable is public.

No No..

I got two projects.. along with source code. One is compiled into Lib file and other is compiled into .exe file.. Now i want to write a set statement in lib project, which will set a variable present in exe project...

i hope you got my problem...

Ah...hm, how about having a pointer to the exe's variable that the lib initializes to null.

Then when the exe initializes, it sets that pointer to &exe_variable.

Then whenever the lib needs to access the variable, it can do

if (pExe_Variable)
SomeVar=*pExe_Variable; or *pExe_Variable = SomeVar;

Would that work?

Or maybe when the exe initializes the class in question from the lib it could add a pointer to itself:
pLibClass = new LibClass(this);

and then the lib class could have

pExeClass->Get() or pExeClass->Set(SomeVar);

I don't know if the exe class will need to derive from a small class in the lib (that you then cast to) containing Get, Set and perhaps variable.

Just a thought. Hope it's useful in some way :-)

i am using visual C++.. i added both projects in a single workspace and included main file of exe project in the respective file of lib project and gave all the required include directory paths..

It worked finally..

Thanks anyways..

no problem..