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The Mini Shell Extension Framework – Part III

, 18 Sep 2005
Discussion of a small C++ framework to create Windows shell extensions (IShellFolderImpl).
msf091.zip
include
columnprovider.rgs
contextmenu.rgs
contextmenu_sf.rgs
extension.rgs
extractimage_sf.rgs
infotip.rgs
infotip_sf.rgs
propertysheetext.rgs
propertysheetext_sf.rgs
shell32missing.def
shell32missing.lib
shellfolder.rgs
shellfolderwin98.rgs
vvvsample
Copy of sample1.vvv
menuicon.bmp
sample.def
sample.manifest
sample1.vvv
vvv.ico
vvvtest
sample.yyy
sample1.vvv
sample2.vvv
//
// (C) Copyright by Victor Derks <vba64@xs4all.nl>
//
// See README.TXT for the details of the software licence.
//
#pragma once


#include <shobjidl.h>
#include "olestring.h"


// Visual C++ doesn't like exception handlers that are optimized away in release mode.
#ifdef NDEBUG
#pragma warning(push)
#pragma warning(disable: 4702) // disable unreachable code
#endif


namespace MSF
{

class IItemNameLimitsImplDefault
{
public:
	// Purpose: Override this function to control which chars are valid.
	static const TCHAR* GetValidChars()
	{
		return NULL;
	}


	// Purpose: Override this function to control which chars are invalid.
	static const TCHAR* GetInvalidChars()
	{
		return NULL;
	}
};

template <typename T, typename TItem,
          typename TItemV = IItemNameLimitsImplDefault, typename TItemI = IItemNameLimitsImplDefault>
class ATL_NO_VTABLE IItemNameLimitsImpl :
	public IItemNameLimits
{
public:
	// IItemNameLimits
	STDMETHOD(GetValidCharacters)(LPWSTR* ppwszValidChars, LPWSTR* ppwszInvalidChars)
	{
		try
		{
			ATLTRACE2(atlTraceCOM, 0, _T("IItemNameLimitsImpl::GetValidCharacters\n"));

			const TCHAR* pszValidChars = TItemV::GetValidChars();
			if (pszValidChars == NULL)
			{
				*ppwszValidChars = NULL;

				const TCHAR* pszInvalidChars = TItemI::GetInvalidChars();
				if (pszInvalidChars == NULL)
				{
					*ppwszInvalidChars = NULL;
				}
				else
				{
					*ppwszInvalidChars = COleString::Dup(pszInvalidChars);
				}
			}
			else
			{
				*ppwszValidChars   = COleString::Dup(pszValidChars);
				*ppwszInvalidChars = NULL;
			}
			return S_OK;
		}
		MSF_COM_CATCH_HANDLER()
	}


	// Purpose: called by the shell to retrieve the max length.
	//          Lenght can depend on the current string. (UNC pathname has
	//          different length then local path, etc).
	//
	STDMETHOD(GetMaxLength)(LPCWSTR pszName, int* piMaxNameLen)
	{
		try
		{
			ATLTRACE2(atlTraceCOM, 0, _T("IItemNameLimitsImpl::GetMaxLength, name=%s\n"), pszName);

			// The TItem must implement the static function GetMaxItemNameLength.
			*piMaxNameLen = TItem::GetMaxNameLength(pszName);

			ATLASSERT(*piMaxNameLen >= 0 && "negative length?");
			return S_OK;
		}
		MSF_COM_CATCH_HANDLER()
	}
 };

} // namespace MSF

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About the Author

Victor Derks
Software Developer (Senior) Schneider Electric
Netherlands Netherlands
Victor lives in Nijmegen, the oldest city in The Netherlands.
He studied Applied Physics in Delft and now works for GE Healthcare.

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