[DUG] registry caching?

[Ross Levis]

Sorry, I should have mentioned it is Vista, but it'll be the same issue with
Win7.  It's not a virtualization issue.  This is all done with raised
privileges during and immediately after installation.

It seems to be caching the compatibility setting somehow.  Or perhaps the
helper app is inheriting the setting and then inheriting it back to the main
app when it restarts it.  It would appear a very stupid thing for Windows to
do if that is the case, but I'll test it to be sure.

Ross. 

-----Original Message-----
From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz] On
Behalf Of Conor Boyd
Sent: Friday, 28 August 2009 8:03 a.m.
To: NZ Borland Developers Group - Delphi List
Subject: Re: [DUG] registry caching?

Which OS?

If it's Vista (or Win 7), and your registry key is under e.g. HKLM, are
you running into registry virtualization issues?

C. 

-----Original Message-----
From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
On Behalf Of Ross Levis

I hope someone can help.

I have an app where the installer sets an XP compatibility mode registry
entry during installation.  Don't ask why but it is generally required.

As the app loads after installation, it checks some hardware
requirements to see if XP compatibility mode needs to be switched off.
If so, the registry entry is deleted and the program then needs to be
restarted, which I want to do automatically.

I have a helper app which I load just before terminating the main app.
The helper app then reloads the main app after a 2 second sleep.

However, the result is that the program is still loading in
compatibility mode even though the registry entry is deleted well before
it loads.
 
I have LazyWrite disabled on the registry change, so it is instantly
updated.  I tried a massive 15 second sleep in the helper app, so the
main app is closed for 15 seconds before reloading, yet it still loads
as if the registry entry is still there.

If I terminate the app and load it manually, then it's always correct!
I don't understand this.  Why would loading the app manually be any
different to loading it from another app?

I'm using CreateProcess with CREATE_NEW_PROCESS_GROUP to load the helper
app and to load the main app again.  I tried ShellExecute with no
difference.

Is there some way to make this work automatically?

The only method I can adopt at this stage is to popup a message to ask
the user to load the program manually, which is not user friendly.

Many thanks,
Ross.

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