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UDF and Variable type A

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    UDF and Variable type A

    I want to modify a UDF I have to use any type variable to open a form, set the index and optionally locate a record if one is specified, else use the default index as record number order and open the form to the last record.

    I defined my parameter as 'arec = null_value() as A' - which works great until I want to use a numeric value.

    Since this is an optional parameter, how would I test if arec was set to a numeric value or not since isnull() will throw an error for type N?

    Here's my script:

    Code:
    FUNCTION Go_Frm as L(layoutname as C,Index_Name as C,arec = null_value() as A)
    'Description: open/switch to form at specified record set by local var
    'set arec according to indexed field type
    
        DIM frm as P    
        DIM vType as c
        
        [COLOR=#0000ff]vType = typeof(arec)        'this should be helpful - how to use?[/COLOR]
        frm = obj(layoutname)
        
        IF .not. is_object(frm) THEN
            frm = :form.load(layoutname)         
        END IF
        
        [COLOR=#ff0000]IF .not. isnull(arec) THEN    [/COLOR][COLOR=#0000ff]'errs if numeric value entered[/COLOR][COLOR=#ff0000][/COLOR]
            IF Index_Name <> "" THEN            
                frm.index_setexplicit(Index_Name)
                tln("Layout",layoutname)
                tln("Index",Index_Name)
                frm.find(arec)
            ELSE
                'use record number order
                frm.index_set("")
                frm.fetch_last()
            END IF
        ELSE
            frm.fetch_last()
        END IF    
        frm.show()    
        frm.activate()
        Go_frm=.t.
    END FUNCTION
    I use a primary key for a table that is auto increment and padded with leading 0's. And I have an index that converts this key into a number so the user doesn't have to enter the 0's when searching. Now I want to be able to call another form for this table from a button using the number the user enters. In this scenario the called form is using a report preview supercontrol to open an interactive report for the selected record - without applying a query to the form.

    If I use the primary key & index instead, it defeats the effect I am trying to achieve & screws up what the supercontrol and report are set to do using the numeric field.
    Last edited by MoGrace; 01-16-2019, 01:51 PM.
    Robin

    Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

    #2
    Re: UDF and Variable type A

    Robin,

    I think you need to convert the input value to character because "Result_Flag as L = ISNULL( Character_String as C)"


    If vType ="Number" then
    x_arec = convert_type(arec,"c")
    else
    ' more...
    end if
    then apply it
    IF .not. isnull(x_arec)

    Comment


      #3
      Re: UDF and Variable type A

      Thanks John, I hadn't tested for a logical value but should since isnull() wants a character value. I will add that to my modified script and post it in a few minutes.
      Robin

      Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

      Comment


        #4
        Re: UDF and Variable type A

        Here is my modified function - works great if I say so myself! I commented out the UDF TLN() so this is good to go if anyone is interested.
        I decided to make the Index_Name an optional parameter too to use record number order as the default.

        Code:
        FUNCTION Go_Frm as L(layoutname as C,Index_Name = "" as C,arec = null_value() as A)
        'Description: open/switch to form at specified record set by local var
        'set arec according to indexed field type
        
        	DIM frm as P		
        	DIM vType as C
        	DIM xRec as c = ""
        	DIM flag as L = .f.
        	
        	vType = typeof(arec)
        	frm = obj(layoutname)
        	
        	IF .not. is_object(frm) THEN
        		frm = :form.load(layoutname)		 
        	END IF
        	
        	IF Index_Name = "" THEN
        		'use record number order = vw_frm()
        		frm.index_set("")
        		frm.fetch_last()
        		goto SHOWIT
        	END IF				
        
        	SELECT
        		CASE vType = "A"
        			'this s/b equivalent to null, parameter was not set = no find, flag remains .f.
        		CASE ELSE
        			xRec = convert_type(arec,"C")
        			flag = .t.
        	END SELECT
        	
        	IF .not. isnull(xRec)
        		'user set the parameter
        		flag = .t.
        	END IF
        	
        	frm.index_setexplicit(Index_Name)
        	'My UDF for testing in the Trace window
        	'TLN("Layout",layoutname)
        	'TLN("Index",Index_Name)
        	IF flag then
        		frm.find(arec)
        	END IF																	
        
        	SHOWIT:
        	frm.show()	
        	frm.activate()
        	Go_frm = .t.
        END FUNCTION
        Robin

        Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

        Comment

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