topic Re: Use function from other Project? in ObjectARX Forum

Use function from other Project?

daniel_gearloose — Mon, 20 Dec 2021 13:25:01 GMT

Problem:

I create 2 Arx files and in file A I have a function in a cpp and an h for it. With a class. Here is the code.

cpp-Datei (HALLO.CPP) #include "StdAfx.h" #include "HALLO.h" void SAY::HALLO() { acutPrintf(_T("\nHALLO")); } h-Datei (HALLO.H) #ifndef HALLO_H #define HALLO_H class SAY { public: void HALLO(); protected: }; #endif

In the same project file this works with:

SAY SAY; SAY.HALLO();

But I would like to call the function from file B in the acrxEntryPoint.

I used:

#include "..\HALLO\HALLO.h" ... SAY SAY; SAY.HALLO();

but when I compile it spits out a fatal error LNK1120: 1 unresolved externals. Why? Or how do I have to call the function then?

Re: Use function from other Project?

daniel_cadext — Mon, 20 Dec 2021 23:59:18 GMT

yeah, you have to link them.

kind of a hack, but you can use acedInvoke to pass data between two loaded arx modules, just as you can call a lisp function from arx.

Re: Use function from other Project?

daniel_gearloose — Tue, 21 Dec 2021 08:08:35 GMT

Sorry, you got me wrong. I ment from another Project in same Solution. I can't understand why this is a Problem.

Maybe anything with linking? But it is also nice to know that acedInvoke can call ARX-Commands. From calling Lisp commands I heard and used it once in C#.

Re: Use function from other Project?

hbxiaogui — Tue, 21 Dec 2021 12:31:47 GMT

I think you should link Hello.lib to the caller project.

Re: Use function from other Project?

daniel_gearloose — Tue, 21 Dec 2021 21:33:50 GMT

hmmm.... i tryed that... ok, i will try it again...

Re: Use function from other Project?

daniel_gearloose — Tue, 21 Dec 2021 21:47:43 GMT

LINK : fatal error LNK1181: cannot open input file 'Hello.lib'

Re: Use function from other Project?

hbxiaogui — Wed, 22 Dec 2021 01:10:27 GMT

I don't know what your project's name is which contains HALLO.h, so just call it Hello, maybe it is a wrong name, you must change it to correct.
You can add to code as below to the top in your file B, change the full path to the real .
#pragma comment(lib,"C:\\Test\\ProjectName.lib")

Re: Use function from other Project?

tbrammer — Wed, 05 Jan 2022 13:07:50 GMT

If you want to call a function that is implemented in module A from a different module B then module A must export the function. Otherwise it is only callable in A internally. The same holds for the usage of classes.

It's a bit tricky in C++. I recommend to read this: