(Tcl) Unzip an AES Encrypted Text File directly into a String Variable

A common need is to unzip from an AES encrypted Zip archive directly into a string variable, such that the unencrypted file never resides on disk, even temporarily. This example shows how to do it.

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load ./chilkat.dll

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set zip [new_CkZip]

# This example opens a WinZip-compatible AES encrypted
# .zip that contains a single file: hamlet.xml.

# It decrypts and unzips hamlet.xml directly into a string
# variable.
CkZip_SetPassword $zip "secret"
set success [CkZip_OpenZip $zip "qa_data/hamlet.zip"]
if {$success != 1} then {
    puts [CkZip_lastErrorText $zip]
    delete_CkZip $zip
    exit
}

# entry is a CkZipEntry
set entry [CkZip_GetEntryByName $zip "hamlet.xml"]
if {[CkZip_get_LastMethodSuccess $zip] == 0} then {
    puts "Failed to find entry in zip"
    delete_CkZip $zip
    exit
}

# lineEndingBehavior:
# 0 = leave unchanged.
# 1 = convert all to bare LF's
# 2 = convert all to CRLF's
set lineEndingBehavior 0
set srcCharset "utf-8"
set xmlText [CkZipEntry_unzipToString $entry $lineEndingBehavior $srcCharset]
puts "$xmlText"
delete_CkZipEntry $entry


delete_CkZip $zip