PRB: Calling CDatabase::Open in a USRDLL Causes CDBException

MORE INFORMATION

Sample Code

/* 16-bit Compile options needed: /GD
*  16-bit Link options needed:    /LIB:"odbc"
*/ 
#ifndef _WINDLL        // Make this work with WIN32 and WIN16
#define _WINDLL
#endif
#ifndef _USRDLL
#define _USRDLL
#endif
#include <afxwin.h>
#include <afxext.h>
#include <afxdb.h>
class MyDLL : public CWinApp
{
public:
    BOOL InitInstance();
};
#ifdef WIN32    // Make this work with WIN32 and WIN16
extern "C" __declspec(dllexport) int
#else
extern "C" int _export
#endif
FAR PASCAL OpenDatabase(HWND hWndParent /* Needs a parent window */)
{
    TRY
    {
        // Before calling MyDb.Open setup a parent window
        AfxGetApp()->m_pMainWnd = new CWnd;
        AfxGetMainWnd()->Attach(hWndParent);
        CDatabase MyDb;
        // Present list of ODBC sources
        MyDb.Open(NULL,FALSE,FALSE,"ODBC;");
        MyDb.Close();
        // Clean Up
        AfxGetMainWnd()->Detach();
        delete AfxGetMainWnd();
        AfxGetApp()->m_pMainWnd = NULL;
    }
    CATCH_ALL(e)
    {
        if ( AfxGetMainWnd()->GetSafeHwnd() != NULL )
        {
            // Clean Up
            AfxGetMainWnd()->Detach();
            delete AfxGetMainWnd();
            AfxGetApp()->m_pMainWnd = NULL;
        }
        // Exception caused a failure
        return FALSE;
    }
    END_CATCH_ALL
    return TRUE;
}
BOOL MyDLL::InitInstance()
{
    return TRUE;
}
MyDLL theDLL;