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Article #17010

static variables of a Class inside a DLL

#17010
From: Gianstefano Monni
Date: Mon, 14 Apr 2003 07:14
42 lines
2331 bytes
Hi,
    I hope that this is the right newsgroup to post this problem.
I need to use a class that has many static variables. I've tested it as
a standalone class, and it works. Now I'm trying to put it in a DLL. I use
many DLLs in my project group, and all work as I expect to, but I can't use
static variables from outside the DLL. They seem to have random values.
My code looks like this:
//--------------------------------------------------------------------------
---------------------- CODE STARTS
#ifdef __DLL__
                #define DLL_EXP __declspec(dllexport)
#else
                #define DLL_EXP __declspec(dllimport)
#endif

class DLL_EXP CParameters
{
protected:
        CParameters(CParameters&);
        CParametersoperator =(CParameters&);
        CParameters();
        ~CParameters();

static CParameters * parm;

public:
   static void InitDefaults();

   //camera dependent params
   static int VImageMaxX,
              VImageMaxYM
               VGain;
};
//--------------------------------------------------------------------------
---------------------- CODE ENDS
the parm variable is a Singleton. I build it the first time that
InitDefaults is called, i'm __sure__ that all parameters have been
initialized. Inside the DLL the values seem to be right, but when I try to
use them outside the DLL, they have random values.
Does anyone have any idea to suggest?
Thanks in advance,
    Gianstefano Monni
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From: "Gianstefano Monni" <gstefano@crs4.it>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: static variables of a Class inside a DLL
Date: Mon, 14 Apr 2003 09:14:38 +0200
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