Getting problem with RegisterShellFileTypes() in MFC Dialog based application. [modified]

[vasu_sri]

i created one dialog based application. In that Dlg App class i am calling RegisterShellFileTypes(), in CWInApp::initInstace. But application is crashing due to no poniter to document class. code is like this :

CDesktopWallpaperDlg dlg;
m\_pMainWnd = &dlg;

EnableShellOpen();
RegisterShellFileTypes();

INT\_PTR nResponse = dlg.DoModal();
if (nResponse == IDOK)
{
	// TODO: Place code here to handle when the dialog is
	//  dismissed with OK
}
else if (nResponse == IDCANCEL)
{
	// TODO: Place code here to handle when the dialog is
	//  dismissed with Cancel
}

so, can anyone tell me what is the problem exactly? it working with SDI Application..

Regards, Srinivas

modified on Thursday, December 3, 2009 6:24 AM

[Lost User]

The problem is precisely what the error message says. RegisterShellFileTypes creates registry entries to associate a document type and file extension with an .exe. If you aren't using the MFC DocView framework, there is no document class and the function call fails. You can make the same registry entries manually; just because you aren't using the DocView framework doesn't mean you can't associate a file extension with an app, it just takes a bit more code.

[KingsGambit]

It seems RegisterShellFileTypes() is to be used with SDI or MDI apps only.

[vasu_sri]

when i call this RegisterShellFileTypes() in App Class, internally in this function defination having pointer of document class. but dlg based application doesn't have doc class. so that, pointer is becoming NULL.

void CWinApp::RegisterShellFileTypes(BOOL bCompat)
{
ASSERT(m_pDocManager != NULL);
m_pDocManager->RegisterShellFileTypes(bCompat);
}

but,it is working fine with SDI Application. i have tried in one sample SDI application.

Regards, Srinivas

[Lost User]

Yeah.... and what does SDI stand for? 'Single Document Interface'. It works in an SDI app because the SDI app has a document class, and fails in your dialog app because it doesn't have a document class.

[vasu_sri]

I know what is the SDI stand for.. what iam asking that, how to do in dialog based. i created one reg file. but what should be write in reg file instead of document class does.

Regards, Srinivas