Stop and roll back an installation from Pascal code in very silent mode?

E. Garrulo

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Jul 15, 2021, 2:21:17 PM7/15/21

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Is it possible to stop and roll back an installation from Pascal code in very silent mode? Even if that would require coding a custom rollback procedure.

It seems to me that after `CurStepChanged(ssInstall)`, the setup goes ahead until completion - generating an uninstaller and logging a successful installation - no matter what the Pascal code does (for example in an `AfterInstall` event).

If instead this is possible, then:

1. can the installer undo any changes automatically?

2. is any special handling required for installed files that have been scheduled for replacement after restart?

Thank you.

Gavin Lambert

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Jul 15, 2021, 6:25:27 PM7/15/21

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On 16/07/2021 6:21 am, E. Garrulo wrote:
> Is it possible to stop and roll back an installation from Pascal code in
> very silent mode? Even if that would require coding a custom rollback
> procedure.
>
> It seems to me that after `CurStepChanged(ssInstall)`, the setup goes
> ahead until completion - generating an uninstaller and logging a
> successful installation - no matter what the Pascal code does (for
> example in an `AfterInstall` event).

The simplest option is to put your code into a PrepareToInstall handler
instead.

This happens before [Files] are extracted, but you can strategically
ExtractTemporaryFile(s) as needed.

E. Garrulo

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Jul 15, 2021, 6:50:46 PM7/15/21

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Isn't `PrepareToInstall` called before installing files?

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