http://www.perlmonks.org?node_id=995198


in reply to Re^7: Can't change icon with win32 module
in thread Can't change icon with win32 module

I don't see how that is important, $^E is just four clicks away, always there, needs no use lines or nothing
  • Comment on Re^8: Can't change icon with win32 module

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Re^9: Can't change icon with win32 module
by palkia (Monk) on Sep 24, 2012 at 03:50 UTC
    Here is my entire code (it is just an experiment at this stage) 
    
use strict;
use warnings;
use Win32;
use Win32::GUI();
use Win32::API;
Win32::API->Import('kernel32','BOOL SetConsoleIcon(HWND icon)');
eval{SetConsoleIcon( Win32::GUI::Icon->new('box1.ico')->{-handle});}; 
+#eval 2 counter the die from undef return from "new" with "->"
print 0+$^E; print "   ---\n".'$^E = '; #separated \n just in case
print $^E; print "   ---\n".'$! = ';
print $!; print "   ---\n".'$@ = ';
print $@; print "   ---\n".'FormatMessage = ';
print Win32::FormatMessage(Win32::GetLastError());
sleep 50;
exit;

    [download]
    At this version it says 
    0   ---
$^E =    ---
$! = Bad file descriptor   ---
$@ =    ---
FormatMessage = The operation completed successfully.

    [download]
    for box2.ico as well as for zzz.pl (instead of box1.ico) it says 
    0   ---
$^E =    ---
$! = Bad file descriptor   ---
$@ = Can't use an undefined value as a HASH reference at E:\perl exper
+iments\change icon exp 2.pl line 8.
   ---
FormatMessage = The operation completed successfully.

    [download]
    The practical difference between the 3 is that only box1.ico is showed, the other 2 don't change the icon.
    When I target a non-existing file, it says 
    2
The system cannot find the file specified.

    [download]
    It seems to me that Win32::GUI::Icon->new('box1.ico') is just undef when used on box2.ico as well as for zzz.pl.
[reply]
[d/l]
[select]

      Here is mine 

      #!/usr/bin/perl --
use strict; use warnings;
use Win32::GUI();
use Win32::API;
Win32::API->Import('kernel32','BOOL SetConsoleIcon(HWND icon)');

@ARGV or @ARGV = map { glob $_ }
    "C:/Progra~1/*.ico",
    "C:/Progra~1/*/*.ico",
    "C:/Progra~1/*/*/*.ico",
    "C:/Progra~1/*/*/*/*.ico",
#~     "C:/Progra~1/*/*/*/*/*.ico",
    "C:/WINDOWS/*/*.ico",
    "C:/WINDOWS/*/*/*.ico",
    "C:/WINDOWS/*/*/*/*.ico",
#~     "C:/WINDOWS/*/*/*/*/*.ico",
#~     "C:/WINDOWS/*/*/*/*/*/*.ico",
#~     "C:/WINDOWS/*/*/*/*/*/*/*.ico",
;;;;

    
for my $file ( @ARGV ){
    print "$file\n";
    eval {
        my $icon = Win32::GUI::Icon->new( $file )
            or die sprintf qq/ErrIcon \$!(%d)(%s)\n\$^E(%d)(%s)\nGLS(%
+d)(%s)/,
                $!,$!,$^E,$^E,
                Win32::GetLastError(),
                Win32::FormatMessage(Win32::GetLastError())
            ;;;;; 
        SetConsoleIcon( $icon->{-handle} )
            or die sprintf qq/ErrSet \$!(%d)(%s)\n\$^E(%d)(%s)\nGLS(%d
+)(%s)/,
                $!,$!,$^E,$^E,
                Win32::GetLastError(),
                Win32::FormatMessage(Win32::GetLastError())
            ;;;;; 
        1;
    } or warn "$@\n\n";
    sleep 1;
}

SetConsoleIcon( undef );## restore
__END__
$ perl sicon.pl sicon.pl perlmonks.favicon.ico sicon.pl
sicon.pl
ErrIcon $!(2)(No such file or directory)
$^E(0)()
GLS(0)(The operation completed successfully.
) at sicon.pl line 25.


perlmonks.favicon.ico
sicon.pl
ErrIcon $!(2)(No such file or directory)
$^E(0)()
GLS(0)(The operation completed successfully.
) at sicon.pl line 25.

      [download]

      Obviously sicon.pl isn't an .ico file

      Looking at these results and Win32::GUI::Icon docs, it is now obvious that it doesn't preserve $^E from the 2-3 ways it tries to load the file, so $^E ends up being uninformative

      FormatMessage() OTOH assumes 0 means success where as $^E doesn't

      Since this program works for me for about a dozen icon files I find in program files

      I must assume there is something wrong with your box2.ico

      good luck figuring it out :) You might hack on some GUI.xs to insert informative diagnostics, or hit up MSDN for specs regarding icon files so you can compare them to box2.ico ...

[reply]
[d/l]
      use strict;
use warnings;
use Win32;
use Win32::GUI();
use Win32::API;
Win32::API->Import('kernel32','BOOL SetConsoleIcon(HWND icon)');
eval{SetConsoleIcon( Win32::GUI::Icon->new('box1.ico')->{-handle});}; 
+#eval 2 counter the die from undef return from "new" with "->"
print 0+$^E; print "   ---\n".'$^E = '; #separated \n just in case
print $^E; print "   ---\n".'$! = ';
print $!; print "   ---\n".'$@ = ';
print $@; print "   ---\n".'FormatMessage = ';
print Win32::FormatMessage(Win32::GetLastError());
sleep 50;
exit;

      [download]
      "eval{SetConsoleIcon( Win32::GUI::Icon->new('box1.ico')->{-handle});}; #eval 2 counter the die from undef return from "new" with "->"" duh! If Win32::GUI::Icon returns undef, dont deref or meth call on it. I'm not sure if the print() corrupts GLR or not. SetConsoleIcon is irrelevant to call if you didn't create an Icon handle in the first place. AM is correct, you probably dont have a valid ico file. If you really want to know the GLR error, use a C debugger and step through GUI.xs, or use Win32::API to call User32.dll LoadImage directly. You can also post box2.ico (do a binmode and use Data::Dumper to turn the ico file into a escaped string literal) and I see if it loads on my system and why GUI::LoadImage fails.
[reply]
[d/l]

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