Wrong IID_IExtractIcon

[chaos2oo2]

Hi,

I've implemented IShellFolder and IExtractIcon. In IShellFolder I have the following code

STDMETHODIMP CILCShellFolder::GetUIObjectOf(HWND hwndOwner, UINT cidl, PCUITEMID_CHILD_ARRAY apidl, REFIID riid, UINT *rgfReserved, void **ppv){
	
	ATLTRACE(_T("CILCShellFolder::GetUIObjectOf\n"));

	HRESULT hr;

	//if(riid == IID_IExtractIcon){


	if(IsEqualIID(riid, IID_IExtractIcon)){

		CComObject<CILCExtractIcon>* extractIcon;
		hr = CComObject<CILCExtractIcon>::CreateInstance ( &extractIcon );
		
		extractIcon->AddRef();
		//extractIcon->Init((IShellFolder*)this);

		extractIcon->QueryInterface( IID_IExtractIcon, (void**)ppv);	
	
		extractIcon->Release();

		return hr;

	}

	return E_NOTIMPL;;

}

The problem is that my IExtractIcon implementation is never called because the riid of GetUIObjectOf always is IID_IExtractIconA. I thought that IID_IExtractIcon is set depending you have a Unicode or ANSI dll. Everything is set to Unicode for the project. So as long as I do not check for IID_IExtractIconA it's not working. What's the problem?


Kind regards,
Michael

[OReubens]

the thing is that YOU don't decide which of the 2 versions get called. The application that tries to use the IShellFolder does.

You need to provide both a ansi and unicode version of the IExtractIcon (or live with the fact that your code will only work when someone requests one of them).

[chaos2oo2]

the application is the windows explorer in windows 7, does it ask for IID_IExtractIconA? Example of IExtractIcon implementations I can find just do

if(riid == IID_IExtractIcon){
...
}