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It seems to be quite easy to export dialogs from mfc-extension dll's. Just export the corresponding class with AFX_EXT_CLASS and your done. If you do so with an application and a dll you create from scratch you probably even will succeed. But if you insert more and more resources in both the application and the dll, you will get some serious bugs. Here is the reason:

CString strText;strText.LoadString( ID_MY_TEXT );afxDump << strText;

    CMyApp::OnDLLDialog()    {    CDLLDialog dlg;    dlg.DoModal();    }    

Here it is:

/////////////////////////////////////////////////////////////////////////////////////////////
// File ExtDllState.h
////////////////////////////////////////////////////////////////////////////////////////////
#ifndef __EXTDLLSTATE_H__
#define __EXTDLLSTATE_H__

class CEXTDLLState
{
public:
  CEXTDLLState();
  ~CEXTDLLState();
protected:
  HINSTANCE m_hInstOld;
};

#endif
////////////////////////////////////////////////////////////////////////////////////////////
File ExtDllState.cpp
////////////////////////////////////////////////////////////////////////////////////////////
CEXTDLLState::CEXTDLLState()
{
  m_hInstOld = AfxGetResourceHandle();
  AfxSetResourceHandle(extensionDLL.hModule);
}

CEXTDLLState::~CEXTDLLState()
{
  AfxSetResourceHandle(m_hInstOld);
}

Quite short as you may see, but there is a little more to do:

Copy the class texts from above into the files ExtDllState.h and ExtDllState.cpp. Put BOTH files in a public include directory where every project can reach it. In your DLL go to the main source file (which is named after the DLL). Here you find something like this:

static AFX_EXTENSION_MODULE MY_DLL_NAMEDLL = { NULL, NULL };    

where MY_DLL_NAME your dll name is (:

 

Replace this variable name with "extensionDLL". Below this line put the following lines:

    #include "EXTDLLState.h"    #include "ExtDllState.cpp"    

Look for occurrences of MY_DLL_NAMEDLL in the rest of the file and replace it with extensionDLL. Occurrences can only happen in this file since the variable is static.

Now if you want to export a Dialog go into the source file of the corresponding class and include EXTDLLState.h again. Override the function DoModal() (Best done with the ClassWizard). You should get something like:

int CMyDLLDlg::DoModal()    {      // TODO: Add your specialized code here and/or call the base class      return CDialog::DoModal();    }    

replace the TODO line with "CEXTDLLState State;". Now it looks like

 

int CDLLDlgDlg::DoModal()    {      CEXTDLLState State;      return CDialog::DoModal();    }    

With this approach you got a comfortable way to export classes that use resources. Be aware that if you need resources in other places too, to define CEXTDLLState before use. (Especially this must be done with modeless dialogs!!!).

You can use CEXTDLLState everywhere you want to access resources in mfc-ext-dlls. You will always get the right thing. I hope this will help some of you, since I had some troubles till I found an easy and nice way to do handle this.

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