PowerShell

Get MessageSet IDs as a Compact String

Demonstrates the Chilkat MessageSet.ToCompactString method, which returns the unique identifiers in ascending order using compact IMAP message-set syntax, collapsing consecutive runs into inclusive ranges. It takes no arguments. This example loads 1,2,3,4,5,8,9,10 and prints the compact form 1:5,8:10.

Background: The result is canonical for the current set — unique, sorted, and range-compacted — which is the compact notation IMAP servers expect for message-set arguments. It is the inverse of FromCompactString, so the two round-trip: a set emitted here can be reloaded later. The string contains only numbers and omits the HasUids setting, so track UID-vs-sequence separately.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  Demonstrates the MessageSet.ToCompactString method, which returns the unique identifiers in
#  ascending order using compact IMAP message-set syntax, with consecutive runs collapsed into
#  inclusive ranges.  It takes no arguments.

$msgSet = New-Object Chilkat.MessageSet

#  Load a set of individual identifiers.
$success = $msgSet.FromCompactString("1,2,3,4,5,8,9,10")
if ($success -eq $false) {
    $($msgSet.LastErrorText)
    exit
}

#  Get the canonical compact representation.
$compact = $msgSet.ToCompactString()
$($compact)
#  Output: 1:5,8:10