?
Solved

String vs. PChar

Posted on 2004-04-05
4
Medium Priority
?
434 Views
Last Modified: 2010-04-05
procedure Foo(buffer: PChar);
begin
  ...
  // list: TStringList;
  list.Text := buffer;
  ...
end;

Am I allowed to free "buffer" after calling Foo, that is do I get a copy of the memory "buffer" points to?
0
Comment
Question by:__alex
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 26

Expert Comment

by:Russell Libby
ID: 10757496
Yes, you are allowed to free this buffer, as the memory for the list is allocated internally to the list

Regards,
Russell
0
 
LVL 26

Accepted Solution

by:
Russell Libby earned 500 total points
ID: 10757511
See the following (SetString in paticular):

procedure TStrings.SetTextStr(const Value: string);
var
  P, Start: PChar;
  S: string;
begin
  BeginUpdate;
  try
    Clear;
    P := Pointer(Value);
    if P <> nil then
      while P^ <> #0 do
      begin
        Start := P;
        while not (P^ in [#0, #10, #13]) do Inc(P);
        SetString(S, Start, P - Start);
        Add(S);
        if P^ = #13 then Inc(P);
        if P^ = #10 then Inc(P);
      end;
  finally
    EndUpdate;
  end;
end;

Russell
0
 
LVL 2

Author Comment

by:__alex
ID: 10757619
Thanks Russel!
0
 
LVL 26

Expert Comment

by:Russell Libby
ID: 10757660
You are very welcome, and thank you

Russell

0

Featured Post

New benefit for Premium Members - Upgrade now!

Ready to get started with anonymous questions today? It's easy! Learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
Suggested Courses
Course of the Month9 days, 9 hours left to enroll

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question