#1: fickle warning
Posted on 2011-09-26 07:33:22 by John DePasquale
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Hi all,
I have what I'm sure is the simplest but nonetheless most vexing problem, I
just can't figure what's wrong.
I have two perl programs, both web applications. The same line appears in
both, which is:
my $cVar = substr( CGI::param( 'x' ), 0, 1 );
sometimes 'x' has a value and so $cVar gets a value, other times no value.
In the first program, a non-value for x is a non-event and everything is
fine.
But in the other program, when there's a non-value for x I get the error
"Use of uninitialized value in substr at . . . ". This error message shows
up in my html output so the user sees the error message. I don't understand
why the error is being sent in the html stream to the browser from one
program and not the other. Any guidance is greatly appreciated.
Thanks.
- john
John DePasquale
Chief Executive Officer
Paradigm Consulting
49 Dalby Street
Newton, MA 02458
Mobile: 617-610-2424
Fax: 617-600-7326
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>Hi =
all,<o:p></o:p></p><p class=3DMsoNormal>I have what I’m sure is =
the simplest but nonetheless most vexing problem, I just can’t =
figure what’s wrong.<o:p></o:p></p><p class=3DMsoNormal>I have two =
perl programs, both web applications. The same line appears in both, =
which is:<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal> &=
nbsp; my $cVar =3D substr( CGI::param( 'x' =
), 0, 1 );<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>sometimes ‘x’ has a value and so $cVar =
gets a value, other times no value. In the first program, a non-value =
for x is a non-event and everything is fine.<o:p></o:p></p><p =
class=3DMsoNormal>But in the other program, when there’s a =
non-value for x I get the error “Use of uninitialized value in =
substr at . . . “. This error message shows up in my html output =
so the user sees the error message. I don’t understand why the =
error is being sent in the html stream to the browser from one =
program and not the other. Any guidance is greatly =
appreciated.<o:p></o:p></p><p class=3DMsoNormal>Thanks.<o:p></o:p></p><p =
class=3DMsoListParagraph style=3D'text-indent:-.25in;mso-list:l0 level1 =
lfo1'><![if !supportLists]><span style=3D'mso-list:Ignore'>-<span =
style=3D'font:7.0pt "Times New =
Roman"'> =
</span></span><![endif]>john<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>John DePasquale<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Chief Executive =
Officer<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Paradigm Consulting<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>49 Dalby =
Street<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Newton, MA 02458<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Mobile: =
617-610-2424<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Fax: =
617-600-7326 <o:p></=
o:p></span></p><div class=3DMsoNormal align=3Dcenter =
style=3D'text-align:center'><span style=3D'color:#1F497D'><hr size=3D2 =
width=3D"100%" align=3Dcenter></span></div><p =
class=3DMsoNormal><o:p> </o:p></p></div></body></html>
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#2: Re: fickle warning
Posted on 2011-09-26 10:54:11 by Bill Luebkert
On Sun, 09/25/2011 22:33, John DePasquale wrote:
> Hi all,
>
> I have what I=92m sure is the simplest but nonetheless most vexing proble=
m, I just can=92t figure what=92s wrong.
>
> I have two perl programs, both web applications. The same line appears in=
both, which is:
>
> my $cVar =3D substr( CGI::param( 'x' ), 0, 1 );
>
> sometimes =91x=92 has a value and so $cVar gets a value, other times no v=
alue. In the first program, a non-value for x is a non-event and everything=
is fine.
>
> But in the other program, when there=92s a non-value for x I get the erro=
r =93Use of uninitialized value in substr at . . . =93. This error message =
shows up in my html output so the user sees the error message. I don=92t un=
derstand why the error is being sent in the html stream to the browser from=
one program and not the other. Any guidance is greatly appreciated.
I have no idea why - maybe one program uses Carp's fatalsToBrowser
and the other not or some such ? What happens to the one that
doesn't get the error back to the browser ? What does it do instead ?
Does it still work ? What are 'strict' and 'warnings' set to in both ?
The real point is to not let it happen. :) Fix the code to account
for all possibilities. I tend to not combine several calls to subs
in one line of code - doesn't hurt to use an intermediate vrbl and
it's a lot easier to debug if you do since you can break on it if
you like or dump the value to a log file.
HTH, Bill
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