SDA Class

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The SDA class can be used to create a self-decrypting archive which will run natively on Windows platforms.

Syntax

ipworksopenpgp.sda()

Remarks

The class uses the Deflate algorithm specified in RFC 1951 for compression, and then creates a self-decrypting executable archive. This exe will bring up a dialog that will allow the user to select the target directory in which to decompress the files. There is also an optional splash screen that may be displayed before decompression. The text for this splash screen may be set with the BannerText property. You can also set the text that appears on the title bar of each dialog box using the CaptionText property.

Example (Creating a Self-Decrypting Archive)

class.ArchiveFile = "c:\test.exe"
class.RecurseSubdirectories = true
class.SourceDirectory = "c:\foo\"
class.CaptionText = "Testing SDA"
class.BannerText = "Press continue to decompress the archive."
class.CreateSDA()

class.ArchiveFile = "c:\test.exe"
class.SourceFile = "c:\foo\bar.dat"
class.CaptionText = "Testing SDA"
class.BannerText = "Press continue to decompress the archive."
class.CreateSDA()

Note: When creating a self-decrypting archive which exceeds 4 GB or more of uncompressed data or which contains more than 64K files, the class will create a 64-bit archive.

The self-decrypting archive that is created by the SDA class is a Windows application. However, there are command line options available if you wish to batch multiple files. The options are:

For example, the following suppresses all questions and message boxes, and decompress to the current directory, use the following options:

  SDAExtractor /targetpath="." /overwrite=1 /displaymessage=0 /openfile=0 /password=pass

Note that if you run the self-decrypting archive with any command line options, the pop up message box containing the BannerText will be suppressed.