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4D v14.3

Get last field number


Get last field number ( tableNum \| tablePtr ) -> Function result

Parameter	Type	Description
tableNum \| tablePtr	Longint, Pointer	Table number or Pointer to table
Function result	Longint	Highest field number in table

Description

The Get last field number command returns the highest field number among the fields in the table whose number or pointer you pass in tableNum or tablePtr.

Fields are numbered in the order in which they are created. If no field has been deleted from the table, then this command returns the number of fields that the table contains. In the case of iterative loops on the field numbers of the table, you must use the Is field number valid command in order to check whether the field has been deleted.

Example

The following project method builds the array asFields, consisting of the field names, for the table whose pointer is received as first parameter:

 $vlTable:=Table($1)

 ARRAY STRING(31;asFields;Get last field number($vlTable))

 For($vlField;Size of array(asFields);1;-1)

    If(Is field number valid($vlTable;$vlField))

       asFields{$vlField}:=Field name($vlTable;$vlField)

    Else

       DELETE FROM ARRAY(asFields;$vlField)

    End if

 End for