[amibroker] How to detect if 'foreign' is successful or not ?

[Salil V Gangal <salil_gangal@xxxxxxxxx>]

Friends,
 
If a 'foreign' function is executed, then how to detect programatically if it is successful or not ?
 
I thought IsNull will be useful, but it was not.  I executed the following code (and there is MSFT in the database I'm using) and it shows 'IsNull is true' for both.  I tried the code without 'Ref' as well ... Same result.
 


security=foreign("MSFT","C");
if ( IsNull(Ref(security,0)) ) {
    message = "IsNull is true";
}
else {
    message = "IsNull is false";
}
message;
 

security=foreign("DoesNotExist","C");
if ( IsNull(Ref(security,0)) ) {
    message = "IsNull is true";
}
else {
    message = "IsNull is false";
}
message;
 
Regards,
- Salil V Gangal
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