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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

// The following macros control how and which exceptions the MSF framework 
// wil catch. C++ exceptions are not allowed to pass COM interfaces.
// By design MSF implementations should only throw _com_error or exceptions
// derived from std::exception.
// The default handler only catches these 2 exceptions. Other exceptions should
// not be thrown or converted into a com_error.
//
// A 'catch-all' variant is available. This macro will catch all C++ exceptions.
// and due to Visual C++ exception mechanism also all SEH exceptions (like GFP, etc)
// Usage of this macro could hide some programming errors, but can be usefull for 
// the release version. An unhandled exception could crash the shell, the user's main UI.
//
// It is also possible to define your own catch handler. Define MSF_COM_CATCH_HANDLER
// before including the msf header files.

#ifndef MSF_COM_CATCH_HANDLER

#ifdef MSF_COM_CATCH_ALL

#define MSF_COM_CATCH_HANDLER() \
		catch (const _com_error& e) \
		{ \
			return e.Error(); \
		} \
		catch (const std::bad_alloc&) \
		{ \
			return E_OUTOFMEMORY; \
		} \
		catch (...) \
		{ \
			ATLASSERT(!"Catched unexpected exception"); \
			return E_UNEXPECTED; \
		}

#define MSF_COM_CATCH_HANDLER_ON_ERROR(arg1, arg2) \
		catch (const _com_error& e) \
		{ \
			return OnErrorHandler(e.Error(), arg1, arg2); \
		} \
		catch (const std::bad_alloc&) \
		{ \
			return OnErrorHandler(E_OUTOFMEMORY, arg1, arg2); \
		}
		catch (...) \
		{ \
			ATLASSERT(!"Catched unexpected exception"); \
			return OnErrorHandler(E_UNEXPECTED, arg1, arg2); \
		}

#else

#define MSF_COM_CATCH_HANDLER() \
		catch (const _com_error& e) \
		{ \
			return e.Error(); \
		} \
		catch (const std::bad_alloc&) \
		{ \
			return E_OUTOFMEMORY; \
		} \
		catch (const std::exception&) \
		{ \
			return E_UNEXPECTED; \
		}

#define MSF_COM_CATCH_HANDLER_ON_ERROR(arg1, arg2) \
		catch (const _com_error& e) \
		{ \
			return OnErrorHandler(e.Error(), arg1, arg2); \
		} \
		catch (const std::bad_alloc&) \
		{ \
			return OnErrorHandler(E_OUTOFMEMORY, arg1, arg2); \
		} \
		catch (const std::exception&) \
		{ \
			return OnErrorHandler(E_UNEXPECTED, arg1, arg2); \
		}

#endif // not MSF_COM_CATCH_ALL

#endif // not MSF_COM_CATCH_HANDLER

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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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