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Using MFC Dialog in a Win32 DLL

I want to use the U.I. of MFC to create a Dialog Box as
part of a generic win32 DLL.

Example: I have a win32 DLL that draws Graphs. I would like
to be able to configure the graph by making a call to a
member function of the DLL that pops up a configuration
dialog.

My crude attempt appears that the DLL resources are not
accessible (DoModal() returns -1). Any suggestions?

AVaulin

Be sure that you set resource handler to DLL before using dialog resource from this DLL. AfxSetResourceHadle function do this.

rocco

ASKER

I have tried that. It did not make a difference. The DLL
was initial created as a win32 DLL, then adding the shared
MFC library. There seems to be a conflict when _USRDLL is
defined.

yonat

Call AFX_MANAGE_STATE(AfxGetStaticModuleState( )) before loading
resources:

// ...
AFX_MANAGE_STATE(AfxGetStaticModuleState( ))
MyDlg dlg;
int ret = dlg.DoModal();
// ...

rocco

ASKER

That is true if the class is derived from CWinApp
(MFC dll). In doing so, you will get multiple declared
symbols (_DllMain@12).

I am starting with a generic C++ class (via Win32 dll)
and adding a MFC dialog (CDialog) to provide an GUI
interface. The attempt is to make UI classes separate
from the application classes (in this case the main DLL
class that calls a dialog through a member function.

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rpb

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rocco

ASKER

This sounds like were the problem lies. In order to create a
DLL that support a MFC Dialog, some kind of "App" needs to
be made available. In an extension DLL, the Application's
App class is used. For a regular MFC DLL, the DLL is derived
from CWinApp. Which gets into the reason I work from the Win32
DLL side, keeping the MFC code to a limited area... Any suggestion?