Extension DLL's and DYNAMIC_DOWNCAST
Steven Binney -- sbinney@waters.com
Wednesday, March 05, 1997
Environment: VC++ 4.2b, NT 4.0 SP 2
I have an extension DLL (DLL A) that exports a serializable class to
another extension DLL (DLL B) and an executable (EXE A).
My programs link without errors and I am using the dllimport/export scheme
as described in tech note 33.
My problem is that when I call DYNAMIC_DOWNCAST form DLL B, it returns NULL
(STATIC_DOWNCAST ASSERTS) .
>From EXE A, everything works, DYNAMIC_DOWNCAST works and I can debug the
DLL.
Is there a special trick that allows DYNAMIC_DOWNCAST to be used when
using two extension DLLS's.
I also get DLL A loading 2 times (TRACE output) when EXE A runs.
Mike Blaszczak -- mikeblas@nwlink.com
Thursday, March 06, 1997
At 12:15 3/5/97 -0500, Steven Binney wrote:
>I also get DLL A loading 2 times (TRACE output) when EXE A runs.
What TRACE output are you referring to, very specifically?
It doesn't seem like it should be possible to load two instances of
a DLL into the same process.
.B ekiM
http://www.nwlink.com/~mikeblas/
These words are my own. I do not speak on behalf of Microsoft.
This performance was not lip-synched.
steve.rogers@octel.com
Sunday, March 09, 1997
[Mini-digest: 2 responses]
I also had a problem with DYNAMIC_DOWNCAST (can't remember the
exact circumstances) and fixed it by using C++ native
dynamic_cast operator instead of the MFC Macro (which requires
CObject derived classes).
______________________________ Reply Separator _________________________________
Subject: Extension DLL's and DYNAMIC_DOWNCAST
Author: mfc-l@netcom.com at P_Internet_Mail
Date: 3/5/97 12:15 PM
Environment: VC++ 4.2b, NT 4.0 SP 2
I have an extension DLL (DLL A) that exports a serializable class to
another extension DLL (DLL B) and an executable (EXE A).
My programs link without errors and I am using the dllimport/export scheme
as described in tech note 33.
My problem is that when I call DYNAMIC_DOWNCAST form DLL B, it returns NULL
(STATIC_DOWNCAST ASSERTS) .
>From EXE A, everything works, DYNAMIC_DOWNCAST works and I can debug the
DLL.
Is there a special trick that allows DYNAMIC_DOWNCAST to be used when
using two extension DLLS's.
I also get DLL A loading 2 times (TRACE output) when EXE A runs.
-----From: Steven Binney
The TRACE generated by the AppWizard TRACE0("MYDLL.DLL =
Initializing!\n"); shows up multiple times.
I can only debug the first loaded DLL.
I fixed my problem by re-creating the MAK file of DLL A. I do not know =
what caused the problem. DYNAMIC_DOWNCAST was failing because it was =
getting run time info from the second mystery instance.
----------
From: Mike Blaszczak
Sent: Thursday, March 06, 1997 9:31 PM
To: mfc-l@netcom.com
Subject: Re: Extension DLL's and DYNAMIC_DOWNCAST
At 12:15 3/5/97 -0500, Steven Binney wrote:
>I also get DLL A loading 2 times (TRACE output) when EXE A runs.
What TRACE output are you referring to, very specifically?
It doesn't seem like it should be possible to load two instances of
a DLL into the same process.
.B ekiM
http://www.nwlink.com/~mikeblas/
These words are my own. I do not speak on behalf of Microsoft.
This performance was not lip-synched.
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