Question:
I’m trying to modify the contents of an MSI file using Powershell. To do so I create an instance of a WindowsInstaller.Installer then use $installer.OpenDatabase and $database.OpenView. Similar functionality works in VBScript and I’ve seen samples on-line that appear to work.
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$installer = new-object -comobject "WindowsInstaller.Installer" $database = $installer.OpenDatabase("C:\Temp\Setup.msi", 1) |
For the above code, I get an error “Method invocation failed because [System.__ComObject] doesn’t contain a method named ‘OpenDatabase’.”
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$installer = new-object -comobject "WindowsInstaller.Installer" $database = $installer.InvokeMethod("OpenDatabase","C:\Temp\Setup.msi", 1) |
If I attempt to use $installer.InvokeMethod I get the same error “Method invocation failed because [System.__ComObject] doesn’t contain a method named ‘InvokeMethod’.”
Any help would be much appreciated.
Thanks.
Answer:
See the this thread for some guidance. Basically the MSI COM object is implemented in a way that confuses PS. There is a link to a blog post discussing it in that thread.