I've always done basic msi / internal ui so maybe this is a silly question due 
to me never having done this before.

It's my (mis?)understanding that with an external UI handler I'm not in the 
execute sequence until I say go and that I have to drive the UI myself.   

What if in my UI sequence I want to gather registry data, evaluate launch 
conditions,  costing which features and components are going to be installed 
and then show my custom WPF dialogs  with  blocking messages or pretty feature 
trees showing what will be installed.

What is the pattern for that?  Sure, AppSearch and Costing is in the execute, 
is that what I somehow leverage?

Thanks in advance Phil!

Chris

Christopher Painter, Author of Deployment Engineering Blog
Have a hot tip, know a secret or read a really good thread that deserves 
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--- On Fri, 1/29/10, Wilson, Phil <phil.wil...@wonderware.com> wrote:

> From: Wilson, Phil <phil.wil...@wonderware.com>
> Subject: RE: [WiX-users] External UI
> To: "chr...@deploymentengineering.com" <chr...@deploymentengineering.com>, 
> "General discussion for Windows Installer XML toolset." 
> <wix-users@lists.sourceforge.net>
> Date: Friday, January 29, 2010, 11:31 AM
> Those actions are duplicated in the
> Execute sequence anyway, but I'm sure you know that so I
> must be missing something. What are you trying to do? 
> 
> Phil Wilson 
> 
> -----Original Message-----
> From: Christopher Painter [mailto:chr...@deploymentengineering.com]
> 
> Sent: Thursday, January 28, 2010 7:57 PM
> To: wix-users@lists.sourceforge.net
> Subject: [WiX-users] External UI
> 
> I'm playing with the DTF / WPF embeddedUI sample. 
> Being new at writing external UI's, something has me
> puzzled.
> 
> I've read before that when you run with an external UI that
> you basically have to drive the whole ui sequence
> yourself.  That said, what if I want to leverage say
> AppSearch?   I tried calling session.doaction
> but it says the handle is in an invalid state. I am able to
> get properties and query tables though.
> 
> I could understand that you might lose LaunchConditions but
> how do you go about doing all of the normal things like
> searches and costing?
> 
> 
> 
>       
> 
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