navv61.5524931665408608E12 asked a question.
I am confused in terms of the differences between patch and a transform...
I understand a transform file (mst) is a difference between your source and target MSI and also it allows you to customize your final MSI package but doesnt the patch work the same way , isnt the patch essentially contians the differences of previous and current installer?
any inputs are highly appreciated!!!
TIA
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From an implementation perspective, a patch is implemented through transforms - any patch is a combination of metadata and a transform for every previous version it can target, plus any new file data (which transforms can only include externally). Furthermore, as klacounte says, (raw) transforms can generally only be used at install time, and become inextricably part of the installed product; the exception to both is as the implementation of a patch, where they can be installed and possibly removed at a later time.
" A Windows Installer patch (.msp file) is a self-contained package that contains the updates to the application and describes which versions of the application can receive the patch. Patches contain at a minimum, two database transforms and can contain patch files that are stored in the cabinet file stream of the patch package. "
Or to put it more simply:
Path = Transform + Cab Files + Metadata/Validation
Transforms play a huge role in the application of patches though.