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The ! character

 
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vigilant
Halfop


Joined: 05 Jan 2006
Posts: 48
PostPosted: Mon Sep 03, 2007 2:15 pm    Post subject: The ! character Reply with quote
What does it mean when you do {![command]}
And where can i read more about these? Smile
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Anser Quraishi
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rosc2112
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Joined: 19 Feb 2006
Posts: 1454
Location: Northeast Pennsylvania
PostPosted: Mon Sep 03, 2007 3:57 pm    Post subject: Reply with quote
Presumably it means someone is trying to exploit your bot by using tcl special chars in a command attempt..
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r0t3n
Owner


Joined: 31 May 2005
Posts: 507
Location: UK
PostPosted: Mon Sep 03, 2007 4:18 pm    Post subject: Reply with quote
if you mean inside an if statement, ! means if it failed.

Code:
if {[command]} { # [command] returned 1 } else { [command] returned 0 }

if {![command]} { # [command] returned 0 } else { [command returned 1 }


very rough example.
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Alchera
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Joined: 11 Aug 2003
Posts: 3344
Location: Ballarat Victoria, Australia
PostPosted: Mon Sep 03, 2007 8:35 pm    Post subject: Re: The ! character Reply with quote
vigilant wrote:
What does it mean when you do {![command]}
And where can i read more about these? Smile

Tcl Developer Site could be a good place to start.

Your example isn't complete as the logical NOT is used within a conditional statement.

Simply put (your example) means:
Code:
if {NOT [command]} {
   then do something
}

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vigilant
Halfop


Joined: 05 Jan 2006
Posts: 48
PostPosted: Mon Sep 03, 2007 11:04 pm    Post subject: Reply with quote
Thanks a lot Cool
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