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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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llSuccess = .F.

//  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.

loMsgSet = createobject("CkMessageSet")

//  Load a set of individual identifiers.
llSuccess = loMsgSet.FromCompactString("1,2,3,4,5,8,9,10")
if (llSuccess = .F.) then
    ? loMsgSet.LastErrorText
    release loMsgSet
    return
endif

//  Get the canonical compact representation.
lcCompact = loMsgSet.ToCompactString()
? lcCompact
//  Output: 1:5,8:10


release loMsgSet