[fpc-pascal] Re: Access violation that I do not understand while creating a class instance

[Jürgen Hestermann]

ik schrieb:
 > PChar is an array like approach. AnsiString, is a record based 
pointer. It uses more memory, and provide a bit overhead for the same thing.
 > At least on theory. I would love to learn that it's not the case.

AnsiString stores and keeps track of the string length and this has many 
advantages:

*) If you need the length of a Pchar string you always need to count 
character by character (until #0). This is very slow. Ansistring has it 
available directly.

*) If you compare two strings for identity you can first compare 
lengths. If different then strings are different too. Not possible with 
pchar.

*) You can store #0 in AnsiStrings (not possible with pchar because it 
indicates the end of the string).

*) You can access the last string character directly by using the 
length. With pchar you have to iterate on all characters.