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Article #1226

Re: Wierd Program (or Brain) Bug...

#1226
From: Corey Murtagh
Date: Wed, 01 Aug 2001 09:03
39 lines
2323 bytes
Nicholas Gessler <gessler@ucla.edu> wrote in message
news:3b6794e8$1_2@dnews...
> This one has me stumped:
> I wrote a stupid little program.  There is one form, two edit boxes, and a
> MouseOver event handler.  In the handler is the code:
>
> void __fastcall TForm1::FormMouseMove(TObject *Sender, TShiftState Shift,
>       int X, int Y)
> {
>         EditX->Text = "       " + X;

Here's your problem.  Adding an int to a char* will give you an index into
the array of chars.  You need to do something like:

  EditX->Text = AnsiString("       ") + Y;

Once you've got AnsiString involved in the act it properly appends the
string value of Y rather than indexing the string.

> What is puzzling is what appears in the EditX and EditY boxes.  I was
hoping
> that the X and Y coordinates would appear.  NOPE!
> As you move the cursor in the X direction, what scrolls through the Edit
Box
> are the names of the paths to the first 9 jungle sounds.

You're lucky you didn't get some random garbage, or cause an AV.  Imagine
you have a block of memory where these string constants are stored, starting
with the first one (your block of spaces) and continuing through each wav
path.  Index the space string by a large enough value and you'll find
yourself in the middle of one of the wav paths.  This is probably not far
from what's actually happening.


--
Corey Murtagh
The Electric Monk
"Quidquid latine dictum sit, altum viditur."
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From: "Corey Murtagh" <emonk@ihug.co.nz>
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Subject: Re: Wierd Program (or Brain) Bug...
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