We help IT Professionals succeed at work.

"Invald Pointer Operation" on Setlength of dynamic array

shawn857
shawn857 asked
on
479 Views
Last Modified: 2014-11-12
Hi guys, I have a very simple program (I'm trying to do a little speed comparison between StrCopy, StrMove, and Move), and I keep getting an Invalid Pointer Operation on the 2nd time through my "while" loop on this line:

SetLength(HOutBuffer2, hlength);

Here's my code:

var
  Form1: TForm1;
  infiletext : TGpTextFile;
  outfilestream : TGpHugeFileStream;
  inrec : string;
  bytes_Wrote, hlength : integer;
  HOutbuffer2 : array of Char;

implementation

{$R *.dfm}


procedure TForm1.Button1Click(Sender: TObject);
begin
  infiletext:=TGpTextFile.CreateEx('bigtest.txt', FILE_ATTRIBUTE_NORMAL, GENERIC_READ);
  infiletext.Reset();
  outfilestream:=TGpHugeFileStream.Create('outstream.txt', accWrite);


  while not infiletext.EOF do
  begin
    inrec:=infiletext.Readln;
    hlength := length(inrec)+2;

    SetLength(HOutBuffer2, hlength);
    StrCopy(PChar(HOutBuffer2), PChar(inrec+#13#10));

    bytes_Wrote:=OutFileStream.Write(HoutBuffer2[0], hlength);
  end; // WHILE

  infiletext.Close;
  infiletext.Free;
  OutFileStream.Free;
end;

Open in new window


It does the 1st iteration of the loop fine, then crashes 2nd time through on "SetLength(HOutBuffer2, hlength);"

Thanks!
   Shawn
Comment
Watch Question

Sr. Software Engineer
CERTIFIED EXPERT
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION

Author

Commented:
Thanks Merijn, that did the trick!

Cheers
    Shawn

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.