The $LongStrings compiler directive determines whether Delphi treats the string type as an AnsiString when on (default) or ShortString when off.
The default recognises that the general use of string types is to hold data that is likely to be longer than 255 characters (ShortString capacity).
|$LongStrings is equivalent to $H.
$LongStrings can be used multiple times in your code, but this is not recommended (except for illustration purposes in the example).
The default value is $LongStrings On
|$H||Treat string types as AnsiString or ShortString|
|AnsiString||A data type that holds a string of AnsiChars|
|ShortString||Defines a string of up to 255 characters|
|String||A data type that holds a string of characters|
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|Example code : Packing a record to reduce storage|
// Define littleString to be treated as a ShortString
littleString : string;
// Define bigString to be treated as an AnsiString
bigString : string;
// Show the size of the little string - 256 bytes
ShowMessageFmt('littleString size = %d',[SizeOf(littleString)]);
// Show the size of the big string - 4 - a pointer to text
ShowMessageFmt(' bigString size = %d',[SizeOf(bigString)]);
|Show full unit code|
| littleString size = 256
bigString size = 4