Hi,
You NEED to define gWorkspaceDirectory in compile code.
This means do NOT define it in rootalias.C (at least not directly),
and do NOT attempt to access it before loading it library.
In the example you sent, I must be missing some code since I did not
find a "pragma link C++ global gWorkspaceDirectory;"
Anyway, this can be done very very simply.
Create two (new?) files called global.h global.cpp containing:
//global.h
#ifndef HEADER_GLOBAL_H
#define HEADER_GLOBAL_H
#include "TString.h"
R__EXTERN TString gWorkspaceDirectory;
#endif HEADER_GLOBAL_H
// end of global.h
//global.cpp
#include "global.h"
TString gWorkspaceDirectory
//end of global.cpp
then add
#include "global.h"
to your MTest.cxx
Then use test.C as follow:
{
gSystem->CompileMacro("global.cpp","k");
gWorkspaceDirectory="Hello world";
gSystem->CompileMacro("MTest.cxx","k");
MTest* sayhello=new MTest(); //should print "Hello world"
}
Cheers,
Philippe.
-----Original Message-----
From: Martijn Schellekens [mailto:Martijn.Schellekens@iota.u-psud.fr]
Sent: Monday, February 09, 2004 1:02 PM
To: Philippe Canal; roottalk@pcroot.cern.ch
Subject: RE: [ROOT] Several question: globals in aclic, circular
dependencies in aclic, default webbrowser
Thanks for your answers Philippe,
Yet I stil dont understand what I am supposed to do exactly for the first
point. I tried out what you proposed but I didn't get what I expected.
I enclosed three files with this mail: could you show me what you would do
exactly to make the script "Test.C" work?
thanks a lot,
Martijn
A 11:29 09/02/2004 -0600, Philippe Canal a écrit :
> > 1. Global variables: critical
>
> > I compiled the code (ie: MUtilities.cxx) using the R__EXTERN macro and
> > compilation is fine
>
>Actually you should use R__EXTERN in an header file (for other compilation
>unit) and 'declare' the global variable without the R__EXTERN in one of the
>cxx file.
>
> > 2. Circular dependencies: important
>
>There is a couple of solutions.
>In the following I assume that you have 4 files: file1.C file1.h, file2.C
>and file2.h
>You need to create a 5th file:
>
>// lib.C
>#include "file1.C"
>#include "file2.C"
>// end of lib.C
>
>and use it:
> root [] .L lib.C+
> root [] .L file1.h+
> root [] .L file2.h+
>
>Or you can use a more elaborate lib.C file:
>
>// lib.C
>#include "file1.C"
>#include "file2.C"
>#ifdef __CINT__
>#pragma link C++ class myclass1+;
>#pragma link C++ class myclass2+;
>// and any other pragma statements that are needed
>#endif
>// end of lib.C
>
>and use it:
> root [] .L lib.C+
>
>
> > 3. Default Webbrowser: enhancement
>
>We are working toward making the THtml documentation available at run-time.
>
>Cheers
>Philippe
>
>-----Original Message-----
>From: owner-roottalk@pcroot.cern.ch
>[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Martijn Schellekens
>Sent: Monday, February 09, 2004 8:05 AM
>To: roottalk@pcroot.cern.ch
>Subject: [ROOT] Several question: globals in aclic, circular
>dependencies in aclic, default webbrowser
>
>
>Hi Rooters,
>
>I encoutered three problems this weekend, and I desperately need some help.
>
>1. Global variables: critical
>
>I tried to compile several scripts this weekend that used global variables.
>The global variable was for example a TString gWorkspaceDirectory that does
>exist in my
>gROOT according to GetListOfGlobals() (it is defined in my rootalias.C)
>I compiled the code (ie: MUtilities.cxx) using the R__EXTERN macro and
>compilation is fine
>(as a matter of fact i use ACLiC)
>I created the header MUtilities_linkdef.h that is detected and integrated
>by the compilation
>procedure as gDebug=6 tells me
>I wrote #pragma link C++ global gWorkspaceDirectory in my linkdef file.
>Yet once the script is loading it returns it can not identify
>gWorkspaceDirectory.
>What do I wrong or where can I find documentation that explains simply what
>to do?
>
>
>2. Circular dependencies: important
>
>I have two source files that are strongly related. The header files are
>sufficient for
>compiling yet once compiled with ACLiC they can not be loaded as they
>depend on each other
>and they can not be loaded simultaneously. Is there a simple way using
>ACLiC to compiling
>and loading those interdependent source files?
>
>
>3. Default Webbrowser: enhancement
>
>Documentation related to my userinterface is in html (by the way thanks for
>the excellent
>THtml class) and it would be nice for the users to simply press on a button
>so it opens. Is
>there a methos within root that could return the default internet browser
>(on both linux,
>windows and macOS)?
>
>
>I thanks in advance anybody that could help me on any of those questions.
>
>Martijn Schellekens
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