how to show a dialog box in wix

 

Sometime we may want to show a dialog box to user from installation package, below is an example

<CustomAction Id="ConfirmAndCleanUpOldFolder"
              Script="vbscript"
              Execute="immediate">
  <![CDATA[
    On Error Resume Next
    Set WshShell = CreateObject("WScript.Shell")
    strProgramData = WshShell.ExpandEnvironmentStrings("%ProgramData%")
    strFolderPath = strProgramData & "\sompath\"
    Set fso = CreateObject("Scripting.FileSystemObject")
    If Session.Property("UILevel") = 4 And fso.FolderExists(strFolderPath) Then
      result = MsgBox("An older version of the data folder exists, which is no longer necessary for the application's operation. Would you like to remove it now ? " & strFolderPath, vbYesNo + vbSystemModal, "Clean up redundant files")
      If result = vbYes Then
        fso.DeleteFolder strFolderPath, True
        If Err.Number <> 0 Then
          MsgBox "Failed to delete folder: " & Err.Description
        Else
          Session.Property("OLD_FOLDER_CLEANED") = "yes"
        End If
      End If
    End If
    On Error GoTo 0
  ]]>
</CustomAction>

and put 

<InstallExecuteSequence>
  <Custom Action="ConfirmAndCleanUpOldFolder" After="InstallInitialize" />