RE: interpolating $obj->varname in strings
hmmm - and I'm guilty of not reading your message properly!
Laughing at myself...
-Original Message-
From: Bennett Haselton [mailto:[EMAIL PROTECTED]]
HUH? $res->code is not a variable, it's a call to a method. Is that what you
mean? Because if you really mean a variable, than it should be
print "Value of code is: $res->{code}\n";
which works.
Sorry for being pedantic, but it's unclear what you mean, and I don't think
the other respondents have noticed the contradiction in your question.
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Re: interpolating $obj->varname in strings
Your suspicion is correct. This probably won't save you much typing but,
from perlfaq4:
How do I expand function calls in a string?
This is documented in perlref. In general, this is fraught with quoting and
readability problems, but it is
possible. To interpolate a subroutine call (in list context) into a string:
print "My sub returned @{[mysub(1,2,3)]} that time.\n";
If you prefer scalar context, similar chicanery is also useful for arbitrary
expressions:
print "That yields ${\($n + 5)} widgets\n";
Version 5.004 of Perl had a bug that gave list context to the expression in
${...}, but this is fixed in
version 5.005.
See also ''How can I expand variables in text strings?'' in this section of
the FAQ.
Function calls, I guess, are just to expensive to look for.
$calars are easy to find (even li$t and ha$h elts) because they always
$tart.
- Original Message -
From: "Bennett Haselton" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, February 22, 2001 3:57 PM
Subject: interpolating $obj->varname in strings
> I like being able to write
>
> print "Value of var is: $var\n";
>
> but with variable names like or $res->code, if you try to do
>
> print "Value of code is: $res->code\n";
>
> you get:
> Value of rescode is: HTTP::Response=HASH(0x176517c)->code
>
> I can do
> print "Value of code is: " . $res->code . "\n";
> but that gets pretty messy and error-prone in a long string with lots of
> interpolated variables.
>
> On the other hand, if you do:
> print "Value of var is: $hash->{'var'}\n";
> then it works properly.
>
> I suspect that the reason that 'print "$res->code\n";' doesn't work is
> because "code" is not really a member variable name, and is actually a
> function call that returns a value. But it's still annoying. Is there
any
> easier way to interpolate those variables in strings?
>
> Maybe this sounds lazy, but if I program perl for another few years, then
> over the long run this will save me typing '" . ' and ' . "' hundreds of
> times -- almost enough keystrokes to justify writing this message :)
>
> -Bennett
>
> [EMAIL PROTECTED] http://www.peacefire.org
> (425) 649 9024
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RE: interpolating $obj->varname in strings
-Original Message-
From: Bennett Haselton [mailto:[EMAIL PROTECTED]]
>I like being able to write
>
>print "Value of var is: $var\n";
>
>but with variable names like or $res->code, if you try to do
>
>print "Value of code is: $res->code\n";
HUH? $res->code is not a variable, it's a call to a method. Is that what you
mean? Because if you really mean a variable, than it should be
print "Value of code is: $res->{code}\n";
which works.
Sorry for being pedantic, but it's unclear what you mean, and I don't think
the other respondents have noticed the contradiction in your question.
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Re: interpolating $obj->varname in strings
> print "Value of code is: $res->code\n"; > > you get: > Value of rescode is: HTTP::Response=HASH(0x176517c)->code > > I can do > print "Value of code is: " . $res->code . "\n"; Its more effecient to pass arguments to print() using commas: print 'Hello ', $res->code(), ' World'; Than trying to make Perl interpolate them inside of the string. ___ Perl-Win32-Users mailing list [EMAIL PROTECTED] http://listserv.ActiveState.com/mailman/listinfo/perl-win32-users
RE: interpolating $obj->varname in strings
> I like being able to write > > print "Value of var is: $var\n"; > > but with variable names like or $res->code, if you try to do > > print "Value of code is: $res->code\n"; > > you get: > Value of rescode is: HTTP::Response=HASH(0x176517c)->code > > I can do > print "Value of code is: " . $res->code . "\n"; > but that gets pretty messy and error-prone in a long string > with lots of > interpolated variables. you may want to read the information located here: http://perl.plover.com/#identity i stumbled on to this and thought it was interesting mark ___ Perl-Win32-Users mailing list [EMAIL PROTECTED] http://listserv.ActiveState.com/mailman/listinfo/perl-win32-users
RE: interpolating $obj->varname in strings
A third option:
print "Value of code is @{[$res->code]}";
-Paul
> -Original Message-
> From:
> IMCEANOTES-Ian+20Stewart_Great+20Lakes_AirTouch+40AIRTOUCH+5FC
> ONNECT@BAM
> .com
> [mailto:IMCEANOTES-Ian+20Stewart_Great+20Lakes_AirTouch+40AIRT
> OUCH+5FCON
> [EMAIL PROTECTED]]
> Sent: Thursday, February 22, 2001 4:24 PM
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: Re: interpolating $obj->varname in strings
>
>
> Two options I can think of:
>
> 1) Pass a list to the print statement:
>
> print "Value of code is: ", $res->code;
>
> 2) use printf():
>
> printf("Value of code is: %s", $res->code);
>
>
>
> HTH,
> Ian
>
>
>
> From: Bennett Haselton <[EMAIL PROTECTED]> on
> 02/22/2001 03:57
> PM
>
> To:
> [EMAIL PROTECTED]@SMTP@JVEXCHANGE
> cc:
> bcc:
>
> Subject:interpolating $obj->varname in strings
>
> I like being able to write
>
> print "Value of var is: $var\n";
>
> but with variable names like or $res->code, if you try to do
>
> print "Value of code is: $res->code\n";
>
> you get:
> Value of rescode is: HTTP::Response=HASH(0x176517c)->code
>
> I can do
> print "Value of code is: " . $res->code . "\n";
> but that gets pretty messy and error-prone in a long string with
> lots of
> interpolated variables.
>
> On the other hand, if you do:
> print "Value of var is: $hash->{'var'}\n";
> then it works properly.
>
> I suspect that the reason that 'print "$res->code\n";'
> doesn't work
> is
> because "code" is not really a member variable name,
> and is actually
> a
> function call that returns a value. But it's still
> annoying. Is
> there any
> easier way to interpolate those variables in strings?
>
> Maybe this sounds lazy, but if I program perl for
> another few years,
> then
> over the long run this will save me typing '" . ' and ' . "'
> hundreds of
> times -- almost enough keystrokes to justify writing
> this message :)
>
> -Bennett
>
> [EMAIL PROTECTED] http://www.peacefire.org
> (425) 649 9024
> ___
> Perl-Win32-Users mailing list
> [EMAIL PROTECTED]
>
http://listserv.ActiveState.com/mailman/listinfo/perl-win32-users
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