[WiX-users] Validation check on UI fields

[sangeeta1]

To elaborate more on my problem with some code sample:

I have username and domain fields on UI dialog and I want to check if the
user exists in the domain before the installation continues any further. So,
in the Finish control of dialog, I inserted events to run CustomActions as
shown below. To

<Control Id="Finish" Type="PushButton" X="236" Y="323" Width="56"
Height="17" Default="yes" Cancel="yes" Text="!(loc.WixUIFinish)" >
          <Publish Event="DoAction" Value="RunUserCheck"
Order="1"></Publish>
          <Publish Event="DoAction" Value="CheckUserExistsCA"
Order="2"></Publish>
          <Publish Event="SpawnDialog" Value="UserMissingDlg">Not
UserFound</Publish> 
          <Publish Event="EndDialog" Value="Return">UserFound</Publish>
        </Control>

Here are the custom action definitions

    <CustomAction Id="RunUserCheck" Execute="immediate"
Property="CheckUserExistsCA" Value="&quot;[POWERSHELLEXE]&quot;
-ExecutionPolicy RemoteSigned -NoProfile -NoExit -Command {import-Module
ActiveDirectory; $a=&quot;&quot; ; try{$a=get-ADUser
&quot;[IAMUSERNAME]&quot;}catch{};"/>
    <CustomAction Id="CheckUserExistsCA" BinaryKey="WixCA"
DllEntry="CAQuietExec" Execute="deferred" Return="check" Impersonate="no"/>


I am not scheduling these custom actions anywhere in <InstallUISequence>
which is correct I presume.

In one of the posts, I read that the validation custom action should not be
"deferred" and should be "immediate". but I cannot do this, because of the
syntax of property usage.

Can someone help in fixing the code to validate a user's existence in
domain.

thanks,
sangeeta
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