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Can Pass variable to eval_valid?

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  • Tim Kiebert
    Re: Can Pass variable to eval_valid?

    Originally posted by DOntquIT View Post
    Thanks Tim,

    instead of eval_valid, i used eval.

    It Fixed.
    OK. no problem. I was wondering about that too.

    Leave a comment:

  • Tim Kiebert
    Re: Can Pass variable to eval_valid?



    Leave a comment:

  • DOntquIT
    Re: Can Pass variable to eval_valid?

    Thanks Tim,

    instead of eval_valid, i used eval.

    It Fixed.
    Last edited by DOntquIT; 08-27-2008, 06:26 AM.

    Leave a comment:

  • Tim Kiebert
    Re: Can Pass variable to eval_valid?

    Yes it is.

    eval_valid() tests wether or not a supplied expression is valid. So if in your example 'customer' is a variable or fieldname then you need to pass in "customer" (with the quotes) to the function. You are telling it to test the expression within the quotes. If you want to pass in the expression 'customer' that itself is stored in a variable then you need to assign the expression 'customer' to this second variable as a string. Ie cust = "customer". When the function runs it tests the expression contained in cust. See below for some examples.

    I hope this is what you are asking.

    dim customer as C
    customer = "Jim Smith"
    dim cust as C
    cust = "Customer"
    ?eval_valid(cust)  'this tests if the expression in cust is valid. it is because 'Customer' is a valid variable that resolves to a valid value
    = .T.
    = "Customer"
    ?eval(cust)   'this evaluates the expression contained in cust which is 'Customer' which contains 'Jim Smith'
    = "Jim Smith"
    ?eval_valid(Customer)   'this returns false because customer does not contain a valid expression. It just contain a value.
    = .F.
    ERROR: Variable "Jim Smith" not found.
    ?eval_valid("Customer")  'this returns true because a valid expression has been passed to the function
    = .T.
    = "Jim Smith"

    'Cust = Customer' This simply assigns the value contained in Customer to the Cust variable. If you then pass Cust to the eval_valid function it would be testing the value contained in Customer
    Last edited by Tim Kiebert; 08-27-2008, 05:55 AM. Reason: more info

    Leave a comment:

  • DOntquIT
    started a topic Can Pass variable to eval_valid?

    Can Pass variable to eval_valid?

    Is it possible to pass variable to eval_valid function

    if eval_valid("customer") then
    ....instead of this

    dim cust as c
    cust = customer
    if eval_valid(cust) then

    is that possible?

    i tried this way but it doesnt turn out for i got blind clue that im not passing customer within double quotes("")can pass value to variable with doublequotes?
    instead of passing cust = customer
    i want to pass cust ="customer"

    Can do this?