About ZIP Archives

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4D v19.8

About ZIP Archives

Overview

A 4D ZIP archive is a File or Folder object containing one or more files and folders, which are compressed to be smaller than their original size. These archives are created with a ".zip" extension and can be used to:

Save disk space
Store data on a removable media device
Easily transfer files/folders via mediums which may have size limitations (e.g., email or inter/intranet systems)

4D ZIP archives are created and handled with the following 4D commands:

Properties

The file and folder properties are compatible with ZIP archives, with some specificities which are listed below.

Notes: All properties are read-only.

Files

Properties	ZIP archive comments
file.creationDate
file.creationTime
file.exists
file.extension
file.fullName
file.hidden
file.isAlias
file.isFile
file.isFolder
file.isWritable	Always false
file.modificationDate
file.modificationTime
file.name
file.original
file.parent
file.path	Returns a path relative to the archive
file.platformPath

Folders

Properties	ZIP archive comments
folder.creationDate	Date may be different for the root folder from a folder within the archive
folder.creationTime	Time may be different for the root folder from a folder within the archive
folder.exists
folder.extension
folder.fullName
folder.hidden
folder.isAlias
folder.isFile
folder.isFolder
folder.isPackage
folder.modificationDate	Date may be different for the root folder from a folder within the archive
folder.modificationTime	Time may be different for the root folder from a folder within the archive
folder.name
folder.original
folder.parent	The archive's virtual root folder has no parent. However, the folders within the archive may have a parent other than the root.
folder.path	Returns a path relative to the archive
folder.platformPath

Methods

The following tables list the compatibility of file and folder methods with ZIP archives.

Files

Methods	Comments
file.copyTo( )
file.create( )	Not available for ZIP archives
file.createAlias( )	Not available for ZIP archives
file.delete( )	Not available for ZIP archives
file.getContent( )
file.getIcon( )
file.getText( )
file.moveTo( )	Not available for ZIP archives
file.rename( )	Not available for ZIP archives
file.setContent( )	Not available for ZIP archives
file.setText( )	Not available for ZIP archives

Folders

Methods	Comments
folder.copyTo( )
folder.create( )	Not available for ZIP folder archives
folder.createAlias( )	Not available for ZIP folder archives
folder.delete( )	Not available for ZIP folder archives
folder.file( )
folder.files( )
folder.folder( )
folder.folders( )
folder.getIcon( )
folder.moveTo( )	Not available for ZIP folder archives
folder.rename( )	Not available for ZIP folder archives