TMS Software Blog – Using Windows Explorer from time to time to open ZIP files or create ZIP files, I knew that Windows can internally manage ZIP files so it was a matter of searching via what API this functionality is exposed to use it from applications. And yes, it is effectively exposed, albeit in a limited way via OLE automation with Shell.Application. This API makes it fairly easy to zip or unzip a ZIP file. Here is a function for using the API from Delphi to unzip a file. The filter parameter is optional and can be used to extract only files that match the filter condition. const SHCONTCH_NOPROGRESSBOX ...
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