Re^4: How to get a window's menu as a Win32::GUI::Menu object?

[shadrack]

I don't think so, blessing a hash doesn't create a handle (windows does that), it just gives you an object you can call methods on

Which is why I don't understand why it's relevant. How does it help my solve the problem?

OTOH, the code you have posted includes no bless anywhere :)

Fair enough:

#!perl
use Win32::GUI;

&Main();
exit 0;

sub Main {

    my $Menu = Win32::GUI::MakeMenu(
        '&Program' => 'Program',
        ' > &Alpha' => { -name => 'Alpha', -onClick => \&Alpha_Select 
+},
        ' > &Beta' => { -name => 'Beta', -onClick => \&Beta_Select },
    );

    my $WinMain = Win32::GUI::Window->new(
        -name => 'Main',
        -menu => $Menu,
        -text => 'Menu Test',
        -width => 300,
        -height => 200,
        -onTerminate => \&Main_Terminate,
    );

    $WinMain->Show();
    Win32::GUI::Dialog();
}

sub Main_Terminate { -1; }
sub Alpha_Select { 1; }

sub Beta_Select {
    my($Window)=@_;
    my $menuhandle=$Window->GetMenu();
    my $menu = bless { -handle => $menuhandle }, 'Win32::GUI::Menu';
    $menu->{'Beta'}->Enabled(0); # Doesn't work.
    return 1;
}

You know, I could, or you could just read the link I posted :)

You posted a link to the tutorial. As I explained, I've already read the tutorial. I read it AGAIN after you posted the link, and yet AGAIN just now. I've read it three times in the last hour and still -- I don't see anything that's relevant to the problem, so again, can you please point out specifically what it is in the tutorial that's going to help me solve my problem?

Also, where are you getting your information from?

http://perl-win32-gui.sourceforge.net/cgi-bin/docs.cgi

http://www.mail-archive.com/[e-mail]/msg00945.html

[Anonymous Monk]

Read more... (663 Bytes)

Fair enough: CODE

Employing Basic debugging checklist I get

(
  bless({
    -handle => 28640341,
    Alpha   => bless({ -id => 102, -menu => 41813267 }, "Win32::GUI::M
+enuItem"),
    Beta    => bless({ -id => 103, -menu => 41813267 }, "Win32::GUI::M
+enuItem"),
    Program => bless({ -handle => 41813267 }, "Win32::GUI::MenuButton"
+),
  }, "Win32::GUI::Menu"),
  bless({
    # tied Win32::GUI::Window
    -accel  => 0,
    -handle => 7734092,
    -name   => "Main",
    -type   => 0,
  }, "Win32::GUI::Window"),
)
bless({ -handle => 13304919 }, "Win32::GUI::Menu")

so what you want to do is skip GetMenu and either use global variables , or store $Menu inside $WinMain

Like this

#!/usr/bin/perl --
#!perl
use Win32::GUI;
use Data::Dump;

Main( @ARGV );
exit 0;

sub Main {

    my $Menu = Win32::GUI::MakeMenu(
        '&Program' => 'Program',
        ' > &Alpha' => { -name => 'Alpha', -onClick => \&Alpha_Select 
+},
        ' > &Beta' => { -name => 'Beta', -onClick => \&Beta_Select },
    );

    my $WinMain = Win32::GUI::Window->new(
        -name => 'Main',
        -menu => $Menu,
        -text => 'Menu Test',
        -width => 300,
        -height => 200,
        -onTerminate => \&Main_Terminate,
    );

    $WinMain->Show();
    $WinMain->{__special_Menu} = $Menu;
    dd $Menu, $WinMain;
    Win32::GUI::Dialog();
    delete $WinMain->{__special_Menu}; # "DESTROY"/destructor/manual m
+emory cycle break
}

sub Main_Terminate { -1; }
sub Alpha_Select { 1; }

sub Beta_Select {
    my($Window)=@_;
    my $menuhandle=$Window->GetMenu();
    my $menu = bless { -handle => $menuhandle }, 'Win32::GUI::Menu';
    dd $menu;
#~     $menu->{'Beta'}->Enabled(0); # Doesn't work.
    $Window->{__special_Menu}->{'Beta'}->Enabled(0);
    return 1;
}

Useful regarding memory management, Tutorials: Variable Scoping in Perl: the basics, Coping with Scoping , Mini-Tutorial: Perl's Memory Management, Lexical scoping like a fox, Read this if you want to cut your development time in half!

I'll be back with more:) maybe

[shadrack]

I don't know, but it certainly answers the question you asked , and I quote
"returns a menu HANDLE, not an object reference. This seems to be more or less useless -- unless there's a way to turn the handle into an object? "

Yes, but not just any old object -- THE object the handle was associated with. Sorry, but I would have thought this was obvious given the context of the question. :-/

I am actually using a global now, but I'm looking for a way around it since I'm also using threads which sometimes don't seem to play well with global Win32::GUI object variables.

Anyway, thanks for the suggestions. Storing $Menu inside $WinMain is the solution I'm looking for. I tried something like this before (on a different Win32::GUI issue), but I couldn't make it work -- it's been a while, but IIRC the stored variable refused to "stick" to the object (it was undefined when I tried to access it later). Chalk it up to my lack of understanding of perl's object handling I guess.

[Anonymous Monk]

Yes, but not just any old object -- THE object the handle was associated with. Sorry, but I would have thought this was obvious given the context of the question. :-/

:) Well, sorry, it wasn't obvious to me -- Win32::GUI simply doesn't do that, its not Tk.pm or Wx.pm or some such

There is the undocumented Win32::GUI::GetWindowObject($handle) but it doesn't work with menus

foreget this update: http://search.cpan.org/grep?cpanid=ROBERTMAY&release=Win32-GUI-1.06&string=hmenu&i=1&n=1&C=0 reveals GetMenuFromID

I guess you could remove the IsWindow check from GetWindowObject, recompile Win32::GUI, and try that ... but if this doesn't make you rethink choosing Win32::GUI :)