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Execute a subroutine before exiting the application


Execute a subroutine before exiting the application

By : douglasbgatti
Date : November 17 2020, 11:55 AM
will be helpful for those in need You need to import the SetConsoleCtrlHandler like in this sample:
code :
Module Module1
    Public Declare Function SetConsoleCtrlHandler Lib "kernel32" (Handler As ConsoleCtrlDelegate, Add As Boolean) As Boolean
    Public Delegate Sub ConsoleCtrlDelegate()
    Sub Main()
        SetConsoleCtrlHandler(New ConsoleCtrlDelegate(AddressOf OnExit), True)
        Console.WriteLine("Please try to close down...")
        Console.ReadLine()
    End Sub

    Sub OnExit()
        MsgBox("Help I'm being closed!")
    End Sub
End Module


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Visibility Property resets after exiting Load() subroutine (MS-ACCESS 03, 07, 10)

Visibility Property resets after exiting Load() subroutine (MS-ACCESS 03, 07, 10)


By : user3402628
Date : March 29 2020, 07:55 AM
it helps some times So, are you trying to make the Form disappear once the desired condition is true, or you are trying to keep the form from appearing before you get to it? If the former is true, you'd want to perhaps re-write your logic so that the Form_Open event isn't triggered in the first place (so the form isn't called) and would in practicality be Visible = False.
If the latter is true, then you are going wrong by the Form_Open subroutine even being called - since the call was placed for the form to be opened. Look through your logic before this event to make sure that the conditions are satisfied and to call an alternate form.
Removing multiple instances a an object prior to exiting a subroutine

Removing multiple instances a an object prior to exiting a subroutine


By : Pragadeesh
Date : March 29 2020, 07:55 AM
will help you The New in this case will replace whatever exists in the .DataKeyNames property with the new value. In this case, you aren't adding more values to that property, but will see a performance penalty of repeatedly creating and destroying the string arrays. It is better to check to see if the value was set and then not replace it with a simple if clause:
code :
If employeeDetails.DataKeyNames Is Nothing Then
  employeeDetails.DataKeyNames = New String() {"EmployeeID"}
End If
Application.ScreenUpdating in Subroutine called within Subroutine

Application.ScreenUpdating in Subroutine called within Subroutine


By : Gaurav Agarwal
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Application.ScreenUpdating is a setting of the application and is activated/deactivated globally on setting and unsetting.
Your presumption is correct in that if you set it False in a subroutine, then that routine calls BackupData which sets it false again then sets it True before returning scope to the caller, ScreenUpdating is then True for the remainder of the calling subroutine.
Perl : CRTL C ignored when calling subroutine instead of exiting

Perl : CRTL C ignored when calling subroutine instead of exiting


By : Wilhelm Karol Hałys
Date : March 29 2020, 07:55 AM
should help you out You should not call home() in your signal handler.
Just set a flag that you check in your input loop. When $term->readline() returns, because it was interrupted by CTRL-C, check that the flag was set, reset it and continue to loop.
code :
#!/usr/bin/perl
use strict;
use warnings;

use Term::ReadLine;

$SIG{'INT'} = 'INT_handler';
my $interrupted;
sub INT_handler {
    $interrupted++;
}

my $term = Term::ReadLine->new('Simple Perl calc');

sub home {
    my $prompt = "\$> ";
    my $OUT = $term->OUT || \*STDOUT;

    while ( defined ($_ = $term->readline($prompt)) || $interrupted ) {
        if ($interrupted) {
            $interrupted = 0;
            print "\n[+] Aborting\n";
            next;
        }
        my $com = $_;
        print $com."\n";
        if ($com eq 'exit') {
            exit;
        }
    }
}

home();

exit 0;
$ perl dummy.pl
$> test
test
$> ^C

[+] Aborting
$> ^C

[+] Aborting
$> sdasd^C

[+] Aborting
$> exit
exit
How can I force exiting a perl subroutine/closure via last/next to fail the program automatically?

How can I force exiting a perl subroutine/closure via last/next to fail the program automatically?


By : user2674826
Date : March 29 2020, 07:55 AM
To fix the issue you can do For lack of @ysth's involvement in writing an answer, I'm writing the best solution I found so far, inspired by his first attempt from the comments to the question. (I will re-accept ysth's answer if he posts it later).
code :
my $ok = eval {
    # start transaction
    my $proper_return = 0;
    {
        $sub_ret = $sub->($args);
        $proper_return = 1;
    }
    die "Usage of `next` or `last` disallowed in coderef passed to tx_exec\n" unless $proper_return;
    # commit transaction
    1;
};
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