Re: global struct variables in DLL?

"Scot T Brennecke" <>
Wed, 27 May 2009 03:35:23 -0500
Are you debugging an optimized build, such as one built for Release?

"Lisa Pearlson" <no@spam.plz> wrote in message

I have the same issue with a more simple construction that I have always used, but is also not
behaving as expected:

HINSTANCE g_hInstance = NULL; // global

BOOL APIENTRY DllMain( HANDLE hModule, DWORD dwReason, LPVOID lpReserved)
   switch (dwReason)
       g_hInst = (HINSTANCE) hModule; // when debugging, hModule is NON-NULL, but g_hInst is
0x00000000 (unused???)
   return TRUE;

Perhaps g_hInst is fine, but debugger can not evaluate it?


"Lisa Pearlson" <no@spam.plz> wrote in message

Hi guys,

I'm really confused about something here.
I have a DLL that exports a function "Test()", and in this function I want to use a global

This is my code:

#include <string>

typedef struct _MYSTRUCT {
   wstring t;
   int i;
   _MYSTRUCT() {
       t = TEXT("Some Text");
       i = 10;

MYSTRUCT g_mystruct; // global variable;

// exported function;
void Test()
   ASSERT( g_mystruct.i == 10 ); // fails

   MYSTRUCT locstruct;
   ASSERT( g_mystruct == 10 ); // succeeds

The constructor DOES get called when program runs, but as soon as it enters the function, the
global variable is uninitialized.

I don't understand above behaviour.
The DLL is Loaded and exported function is called from within the same thread.

Can someone enlighten me?


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