Uninstall service

[Jack Duijf]

Hello,

My setupscript installs en starts a service in de Windows Service controller.

All is done in Pascal scripting. Works like a charm.

Now i need the uninstaller to work as follows:

If service is installed and 

    can be stopped and 

    can be uninstalled from the ServiceControler 

     then continue uninstall. (Remove files)

otherwise

     abort the uninstall with a message 

end

How to do this for the uninstaller only.

In other words: Where to put the code below?

var lDone: Boolean;

lDone := false
If IsServiceInstalled('{ServiceId}') then begin 

    If IsServiceStop('{ServiceId}') then begin 

       If ServiceRemove('{ServiceId}') then begin ;

           lDone := true;
       end;

    end; 

End;

Return 

Regards,
Jack Duijf 

[Bill Stewart]

On Thursday, April 16, 2026 at 5:39:41 AM UTC-6 Jack Duijf wrote:

Now i need the uninstaller to work as follows:

If service is installed and 

    can be stopped and 

    can be uninstalled from the ServiceControler 

     then continue uninstall. (Remove files)

otherwise

     abort the uninstall with a message 

end

How to do this for the uninstaller only.

In other words: Where to put the code below?

var lDone: Boolean;

lDone := false
If IsServiceInstalled('{ServiceId}') then begin 

    If IsServiceStop('{ServiceId}') then begin 

       If ServiceRemove('{ServiceId}') then begin ;

           lDone := true;
       end;

    end; 

End;

Return

The documentation[1] is quite helpful. For example, the "Pascal Scripting: Uninstall Code"[2] topic links to the "Pascal Scripting: Event Functions"[3] topic. Scroll down on that page, and you will see a heading titled "Uninstall event functions". Likely you could use the CurUninstallStepChanged event procedure at the usUninstall stage for your code.

[1] https://jrsoftware.org/ishelp/

[2] https://jrsoftware.org/ishelp/index.php?topic=scriptuninstall

[3] https://jrsoftware.org/ishelp/index.php?topic=scriptevents

[Gavin Lambert]

On Friday, April 17, 2026 at 12:10:01 AM UTC+12 Bill Stewart wrote:

The documentation[1] is quite helpful. For example, the "Pascal Scripting: Uninstall Code"[2] topic links to the "Pascal Scripting: Event Functions"[3] topic. Scroll down on that page, and you will see a heading titled "Uninstall event functions". Likely you could use the CurUninstallStepChanged event procedure at the usUninstall stage for your code.

Though note that while this is the proper event to carry out uninstallation tasks, it's too late at that point to abort the uninstall.  You will need to carry on with the rest of the uninstall regardless, though you can still report an error if something fails to uninstall correctly.

If you want to perform a check if something can be uninstalled (without doing the actual uninstall yet) with the option to abort the uninstall, then InitializeUninstall is the place to do that.  For your current example, though, you probably should not use this since your "checks" are actually performing uninstall tasks.

[Jack Duijf]

Hello,

Thank you for pointing out the help sections.
It took some effords, but i managed it.
My uninstaller now works as expected.

Regards,
Jack Duijf

Op donderdag 16 april 2026 om 14:10:01 UTC+2 schreef Bill Stewart: