Running a program on uninstall - wix

Question

I want to run a program when my software is being un-installed, it is a simple form that should gather some feedback on why people are un-installing my software.
I found some WiX examples that works to some degree.
It works pretty fine with a standard windows program (notepad), but when I try to run my own program, it does not work. I think the problems is that the program is removed, before it has been run.
I have tried to print the logs, but they did not give me any clues of what to do.
My code so far:
<CustomAction Id="LaunchFeedBackForm"
ExeCommand="notepad.exe" Directory="INSTALLDIR"
Return="asyncWait" >REMOVE="ALL"</CustomAction>
<InstallExecuteSequence>
<Custom Action="LaunchFeedBackForm" After="InstallValidate"/>
</InstallExecuteSequence>
So I need in some way the un-install process to halt or what ever, until the user has closed the feedback form. After the form has been closed, it should continue and remove all software including the feedback form program.

Answer 1

The way you'd like to get user's feedback seems not that natural to me. If I understand you correctly, you'd like to show this feedback form and wait while a user fills it in, and later on continue with uninstallation, right?
To my own experience, when a user decides to uninstall software, he/she would like it to get uninstalled as quickly and clear as possible. Bringing a "must fill" form in front of them would only negatively affect the user experience. Moreover, as you can see, it is more difficult from the technical point of view. I suppose you've also thought about passing this feedback on to your side, right? Is it emailing the info entered by user? How do you ensure the email gets sent?
Alternatively, you can have this form online on a certain web page of your site and start it when the uninstall is done (NOT in progress). In this way, you don't annoy the user blocking the uninstall process.
So, I would do the following:
have a custom action that starts a browser with a URL you need
the installation program SHOULD NOT WAIT for this to complete
BTW, do not expect lots of feedback - people rarely bother spending some time to give feedback :)

Answer 2

If your EXE is in the MSI, try using the FileKey attribute: http://wix.sourceforge.net/manual-wix2/wix_xsd_customaction.htm
For example, if your EXE is defined like this:
<File Id="FeedbackExe" Name="FeedbackExe.exe"/>
you can use:
<CustomAction Id="LaunchFeedBackForm"
FileKey="FeedbackExe" Execute="deferred"
Return="asyncWait">REMOVE="ALL"</CustomAction>
You can also try creating an uninstall log to see what happens with the custom action:
msiexec.exe /x <ProductCode> /L*V "C:\uninstall.log"
where you use your actual ProductCode.

Answer 3

So I need in some way the un-install process to halt or what ever,
until the user has closed the feedback form. After the form has been
closed, it should continue and remove all software including the
feedback form program.
To do this one would set After="InstallValidate"
<InstallExecuteSequence>
<Custom Action="InstallCustomLogic" After="InstallFinalize" />
<Custom Action="UninstallCustomLogic"
After="InstallValidate" >
NOT UPGRADINGPRODUCTCODE) AND (REMOVE="ALL")
</Custom>
</InstallExecuteSequence>
Set Return attribute to check so that the installer will halt until the specified executable returns.
<CustomAction Id="UninstallCustomLogic"
Directory="INSTALLFOLDER"
ExeCommand="[INSTALLFOLDER]\RetailConnectCustomLogic.exe uninstall"
Return="check"
/>
This is useful in the event where you need to run something located in the program directory before uninstalling the program. One could also set the attribute to ignore if it doesn't return 0