FieldWBlock()

FIELDWBLOCK()

Return a sets/gets code block for field in a given work area

Syntax

      FIELDWBLOCK( <cFieldName>, <nWorkArea> ) --> bFieldBlock

Arguments

<cFieldName> is a string that contain the field name.

<nWorkArea> is the work area number in which <cFieldName> exist.

Returns

FIELDWBLOCK() return a code block that when evaluate could retrieve field value or assigning a new value for a field in a given work area. If <cFieldName> is not specified or from type other than character, or if <nWorkArea> is not specified or is not numeric FIELDWBLOCK() return NIL.

Description

FIELDWBLOCK() return a code block that sets/gets the value of field from a given work area. When this code block is evaluated without any parameters passed then it returns the current value of the given field. If the code block is evaluated with a parameter, than its value is used to set a new value to the field, this value is also return by the block. If the block is evaluate and there is no field with the name <cFieldName> in work area number <nWorkArea>, the code block return NIL.

Examples

      LOCAL bField
      // this block work on the field "name" that exist on work area 2
      bFiled := FIELDBLOCK( "name", 2 )
      // open a file named One in work area 1
      // that have a field named "name"
      SELECT 1
      USE one
      // open a file named Two in work area 2
      // it also have a field named "name"
      SELECT 2
      USE two
      SELECT 1
      ? "Original names: ", One->name, Two->name
      ? "Name value for file Two :", EVAL( bField )
      EVAL( bField, "Two has new name" )
      ? "and now: ", One->name, Two->name

Compliance

If the block is evaluate and there is no field with the name <cFieldName> in the given work area, the code block return NIL.

CA-Cl*pper would raise BASE/1003 error if the field does not exist.

Files

Library is rtl

Seealso

EVAL(), FIELDBLOCK(), MEMVARBLOCK()

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2 responses to “FieldWBlock()

  1. Pingback: Harbour All Functions – F | Viva Clipper !

  2. Pingback: Variable Management Functions | Viva Clipper !

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