Re: [amibroker] Re: How to check on a variable that does not exist?

["Tomasz Janeczko" <groups@xxxxxxxxxxxxx>]

Hello,

Converting to string is not necessary. Instead use IsNull function

function NotDefined( VarName )
{
  return IsNull( VarGet( VarName ) );
}



Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message ----- 
From: "bruce1r" <brucer@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Saturday, February 09, 2008 8:24 PM
Subject: [amibroker] Re: How to check on a variable that does not exist?


> Herman, Progster -
> 
> Common problem when you want a general purpose routine that is
> included and needs to test for existence of needed variables or set
> defaults.  If you think variant instead of variable, there is a common
> solution that may give you what you want -
> 
> function NDef( Varname )
> {
> str =  "" + VarGet( Varname );
> res = IIf( str != "{EMPTY}", True, False );
> 
> return res;
> }
> 
> // W is undefined
> X = C;
> Y = 1;
> Z = "ABC";
> 
> _TRACE( "NDef( \"W\" ) = " + NDef( "W" ) );
> _TRACE( "NDef( \"X\" ) = " + NDef( "X" ) );
> _TRACE( "NDef( \"Y\" ) = " + NDef( "Y" ) );
> _TRACE( "NDef( \"Z\" ) = " + NDef( "Z" ) );
> 
> Buy = Sell = Short = Cover = 0;
> 
> 
> 
> 
> 
> Please note that this group is for discussion between users only.
> 
> To get support from AmiBroker please send an e-mail directly to 
> SUPPORT {at} amibroker.com
> 
> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
> 
> For other support material please check also:
> http://www.amibroker.com/support.html
> 
> Yahoo! Groups Links
> 
> 
> 


Please note that this group is for discussion between users only.

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