Il 26/06/2013 00:31, Tomoki Sekiyama ha scritto: > From: Paolo Bonzini [paolo.bonz...@gmail.com] on behalf of Paolo Bonzini > [pbonz...@redhat.com] >> Il 06/06/2013 17:06, Tomoki Sekiyama ha scritto: >>> +STDAPI VSSCheckOSVersion(void); >>> + >>> +STDAPI COMRegister(void); >>> +STDAPI COMUnregister(void); >>> + >>> +STDAPI DllRegisterServer(void); >>> +STDAPI DllUnregisterServer(void); >> >> Can you explain the difference between COMRegister/COMUnregister and >> DllRegisterServer/DllUnregisterServer (and why the COM+ part need not be >> done by regsvr32)? Also, why does COMUnregister call >> DllUnregisterServer but COMRegister does not call DllRegisterServer? > > COMRegister and COMUnregister are called by`qemu-ga -s install`, > to register/unregister the DLL into/from COM+ application catalogue. > > DllRegisterServer is automatically called inside > pCatalog->InstallComponent() (like regsvr32 does), and register > this DLL as a VSS provider. DllUnregisterServer will do the oposite. > > ICOMAdminCatalog (pCatalog) does not provide a method to uninstall > component, so COMUnregister calls DllUnregisterServer by itself.
Understood, thanks. Just one question remains: why is the COM+ part not needed when you invoke regsvr32? Thanks, Paolo >> Also, is it needed to call VSSCheckOSVersion from the requestor? I >> would think that checking VSSAPI.DLL is stronger than checking the >> version, and indeed you do that check too. > > In Windows XP, VSSAPI.DLL exists but it has different functionality > and interfaces from newer Windows. > http://msdn.microsoft.com/en-us/library/windows/desktop/aa384627(v=vs.85).aspx > > It is checking the OS version because this patchset only supports > Windows 2003 or later. > > Thanks, > Tomoki Sekiyama >
