Delphi ActiveX

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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var
success: Integer;
msgSet: TMessageSet;
compact: WideString;

begin
success := 0;

//  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 := TMessageSet.Create(Self);

//  Load a set of individual identifiers.
success := msgSet.FromCompactString('1,2,3,4,5,8,9,10');
if (success = 0) then
  begin
    Memo1.Lines.Add(msgSet.LastErrorText);
    Exit;
  end;

//  Get the canonical compact representation.
compact := msgSet.ToCompactString();
Memo1.Lines.Add(compact);
//  Output: 1:5,8:10