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

[rakeshthp]

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

[Lars_V_J]

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.

[rakeshthp]

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...

[Lars_V_J]

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 :-)

[rakeshthp]

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..

[Amleto]

no problem..