Newbie question - how to check for a varible

[Stephen Cox]

Lol. Of course. I knew it would be easy. Thanks.

For the life of me I could not find an example in the docs; the user guild
or online.

The messagebox? I hardly use it. Gets in the way mostly. I've been using it
to look at global variables. I know you can run commands. But if you don't
know the commands, it's no help. Or am I wrong about this?


On 5/8/09 2:35 AM, "Joe Lewis Wilkins" <pepetoo at cox.net> wrote:

> Stephen,
> 
> Without even checking, since it's the way it would be done in HC, just
> use:
> 
> if tUsername is empty then ....
> 
> if tUsername exists then ...
> 
> You were already there. Didn't you check these out in the messagebox?
> 
> Joe Wilkins
> 
> On May 7, 2009, at 11:25 PM, Stephen Cox wrote:
> 
>> Really two questions:
>> 
>> How do I check if a variable is empty? Sort of like;
>> 
>> If !empty(tUsername)
>>    // process here
>> Endif
>> 
>> Empty() is a Foxpro function that pops if what you are checking is
>> empty. I
>> can¹t seem to find it¹s equivalent in revolution. Am I approaching
>> this the
>> wrong way? And can I check fields the same way?
>> 
>> I suppose I could create an empty variable and just compare the 2?
>> But is
>> there an easier way?
>> 
>> Next question; checking the existence of a variable? Now I know I
>> can turn
>> on Strict Compilation (and I have) but I¹d rather have the assurance
>> of
>> checking to see if a variable exist? Is this a non-issue in
>> Revolution?
>> 
>> Thanks
>> 
>> -Stephen Cox
> 
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