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Understanding Pointers passed to a function

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  • Understanding Pointers passed to a function

    As someone still relatively new to Alpha Five, I'm confused by the following code below and can't find any documentation that helps.

    I know a pointer is being passed to the function. I assume "with vars" is required to access the variables in the pointer. Each variable is then being referred to with a "v." prefix. What is the relationship between "vars" and "v." in this code?

    Some explanation would be very much appreciated.

    Bob A

    function doValidate as l (vars as p)
    with vars 
    dim errorText as c = ""
    if v.customer_ID = "" then 
    	errorText = errorText + "Customer_ID cannot be blank." + crlf()
    end if
    if v.firstname = "" then 
    	errorText = errorText + "Firstname cannot be blank." + crlf()
    end if 
    if v.lastname = "" then 
    	errorText = errorText + "Lastname cannot be blank." + crlf()
    end if 
    if errorText = "" then
    	doValidate = .t.
    	doValidate = .f.
    	errorText = "Record was not saved. Your form has errors:" + crlf() + errorText
    	?"alert('" + JSStringEncode(errorText) +  "');"
    end if 
    end with 
    end function
    Robert Adler
    Alpha Anywhere Programmer/Developer
    Eagle Dbase Solutions, LLC


  • #2
    Re: Understanding Pointers passed to a function

    I Can't see the rest of the code but I would imagine that the pointer variables is multidimensional.

    ie: You could Have simething like

    HTML Code:
    family as P
    family.Members.Dad as C
    familiy.Members.Mum as C
    familiy.Members.Kids as C
    family.pets. Dog as C

    You can pass thid pointer to a function such as this

    function ShowFamily (Vars as P)
    with Vars.Members
    ui_msg_box ("Dad's name is " + "Dad"
    end with
    The important things with pointers are that you are passing a referecnce to point in memory and not a seperate variable instance. This means any changes to pointer values in the function would also be returned to the calling function (a bit like BYREF).

    Does this help?
    Last edited by Mike Thomson; 07-18-2008, 10:22 AM.
    Mike Thomson


    • #3
      Re: Understanding Pointers passed to a function

      Thanks Mike. Then "v" must be a child pointer under "vars" and not another way of referencing "vars". That's what had me confused.

      Robert Adler
      Alpha Anywhere Programmer/Developer
      Eagle Dbase Solutions, LLC



      • #4
        Re: Understanding Pointers passed to a function

        Hi Bob,

        Originally posted by boba View Post
        Thanks Mike. Then "v" must be a child pointer under "vars" and not another way of referencing "vars". That's what had me confused.
        New variables are created under the "vars" space within the WITH/END WITH unless explicitly dimensioned at another level.

        Other variables, such as v.xxxx are looking in the "vars" space 1st, but will also search higher levels (such as session, layout, global and addin) for a variable called v.xxxx.

        This is why all local uses must be Dim'ensioned to be sure of their locality within a function. See my tips page here on variable dimensioning and usage.

        Ira J. Perlow
        Computer Systems Design

        CSDA A5 Products
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