[vbox-users] Odd behavoir with COM and CLSID_Session

[Dennis Rapp]

> -----Ursprüngliche Nachricht-----
> Von: VirtualBox end user list <vbox-users at virtualbox.org>
> Gesendet: 15.05.08 11:15:48
> An: VirtualBox end user list <vbox-users at virtualbox.org>
> Betreff: Re: [vbox-users] Odd behavoir with COM and CLSID_Session


> Dennis Rapp wrote:
> 
> > I have tried to use the VirtualBox SDK like it is shown here:
> > http://www.virtualbox.org/browser/trunk/src/VBox/Frontends/VBoxHeadless/VBoxHeadless.cpp
> > to create my own hosting/management process for VBox.
> > 
> > But when I try to instantiate the Session coclass i receive
> > an error telling me, that the class is not registered. After looking
> > up the CLSID in the CLASSES_ROOT registry hive and trying to obtain
> > the class factory manually by loading the associated VBoxC.dll the only
> > problem/issue I can think of is, that I'm creating a 32-bit process on
> > a 64-bit machine. But is that important with COM? Or is there any other
> > reason the whole COM thing fails? (the outproc server/etc. is working)
> 
> As you know all in-process COM classes (and Session is such a class) 
> reside in DLLs and get loaded into the client process' address space 
> when instances of these classes are created. However, you cannot load a 
> 32-bit DLL to a 64-bit process on Windows (and vice versa).
> 
> To solve this and similar problems, 64-bit Windows has two registries: 
> the "normal" one which is for 64-bit stuff (including 64-bit COM DLLs) 
> and the "legacy" one which is for 32-bit stuff (including 64-bit COM 
> DLLs). For 32-bit processes, the "legacy" one shadows (substitutes) the 
> "normal" one so that 32-bit processes only see 32-bit COM DLLs while 
> 64-bit processes only see 64-bit COM DLLs.
> 
> Therefore, if you install a 64-bit version of VirtualBox, you can only 
> access Session (VBoxC.dll) from a 64-bit process. If you install a 
> 32-bit verison of VirtualBox to a 64-bit Windows, you will only be able 
> to create Session from a 32-bit process.
> 
> Note that it is unrelated to out-of-process classes like VirtualBox 
> because they live in a separate process and can flawlessly communicate 
> to other processes no matter what bitness they have.
> 
> So, if I understand your case right, you will have to install a 32-bit 
> version of VirtualBox if you want to use Session from a 32-bit process.
> 
> -- 
> Regards,
> Dmitry A. Kuminov
> 
> 
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> vbox-users at virtualbox.org
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> 

That's exactly the issue, so thanks for clearing up the things
(meanwhile I've installed the 64-Bit compilers from the SDK which has solved all those problems).
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