In wix, using vbscript, how do I write to the log file?

Question

I am trying the following inside a customaction:

Session.Log("GetOfficeBitness =" & Session.Property("OfficeBitness"))

And I am getting the error:

Error 1720. There is a problem with this Windows Installer package. A script required for this install to complete could not be run. Contact your support personnel or package vendor. Custom action GetOfficeBitness script error -2146827850, Microsoft VBScript runtime error: Object doesn't support this property or method: 'Session.Log' Line 39, Column 9, MSI (c) (FC:94) [05:51:13:621]: Product: Windward Report Designer 32-bit -- Error 1720. There is a problem with this Windows Installer package. A script required for this install to complete could not be run. Contact your support personnel or package vendor. Custom action GetOfficeBitness script error -2146827850, Microsoft VBScript runtime error: Object doesn't support this property or method: 'Session.Log' Line 39, Column 9,

How can I write to the log inside my script?

Does this answer your question? Windows Installer Deferred execution - how can we log the custom actions running in deferred mode? — user692942
Does this answer your question? how to add a log to my vbscript — user692942
@Lankymart I don't think so because my vbscript is in a wix file. I haven't found a way to have a stand-alone vbscript in the wix file that I can then call from another script. — David Thielen
Does this answer your question? WIX installer execute vbscript from CustomAction — user692942

Stein Åsmul Stein Åsmul · Accepted Answer · 2020-02-23T13:42:07

Logging: Please try to read Robert Dickau's MSI Tip: Writing to the Log File from a Custom Action. In essence something like this:
option explicit
dim inst, rec
set inst = CreateObject("WindowsInstaller.Installer")
set rec=inst.CreateRecord (2)
rec.StringData(1) = "Logging call from " & property("CustomActionData")
Session.Message &H04000000, rec
WiX Sample: I just remembered that I put a sample for this on github: https://github.com/glytzhkof/WiXVBScriptWriteToLog

Tip: Here is a bunch of WiX / MSI links on all kinds of topics centering around debugging.

Links:

Enable installation logs for MSI installer without any command line arguments (about MSI logging in general)
Windows Installer Deferred execution - how can we log the custom actions running in deferred mode?

In wix, using vbscript, how do I write to the log file?

1 Answers