[wix-users] Custom action with optional elevation

Frédéric Bruneteau Frederic.Bruneteau at vasco.com
Sat Aug 6 01:00:43 PDT 2016

Hi Rob,

Yes, I declared the MSI not elevated (“perUser” and “limited”).
Is it possible to elevate if necessary (decided at runtime) ?


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> On 05 Aug 2016, at 18:12, Rob Mensching <rob at firegiant.com> wrote:
> I believe you declared that your MSI will not elevate. Windows Installer should respect that and not elevate.
> _____________________________________________________________
> Short replies here. Complete answers over there: http://www.firegiant.com/
> -----Original Message-----
> From: wix-users [mailto:wix-users-bounces at lists.wixtoolset.org] On Behalf Of Frédéric Bruneteau
> Sent: Friday, August 5, 2016 7:20 AM
> To: wix-users at lists.wixtoolset.org
> Subject: [wix-users] Custom action with optional elevation
> Hello,
> I have an installer launched as user (not Admin):
>    <?define InstallScope="perUser" ?>
>    <?define InstallPrivileges="limited" ?>
> I implemented a custom action that could require elevation (Administrative Privileges) to update a file of the system.
> The installer should ask Admin privileges only if it's necessary.
> As described in CustomAction documentation (http://wixtoolset.org/documentation/manual/v3/xsd/wix/customaction.html)
> the custom action uses attributes "Execute='deferred'" and "Impersonate='no’" :
>  <CustomAction Id='UpdateSystemFile' BinaryKey='CustomAction' DllEntry='UpdateSystemFile' Execute='deferred' Impersonate='no' Return='check'/>
> In the use case that requires elevation, I don't see any dialog box indicating the machine can change or asking Admin credentials, and the custom action does update the system file.
> Is there a specific API to ask elevation in a custom action ?
> Could MSI change dynamically (at runtime) its privileges from user (limited) to admin (elevated)  ?
> Best Regards,
> Frédéric Bruneteau
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