How to Re-dimension a Class Array Outside the Class Definition

• Microsoft Visual FoxPro for Windows, version 3.0

SUMMARY

Visual FoxPro allows you to re-dimension arrays outside their class definition. This article shows by example how to do it.

MORE INFORMATION

User-defined structures (similar to types in Visual Basic, or structs in C) are possible through the Custom Class. and because Custom classes in Visual FoxPro can contain arrays, you can redimension arrays outside the class definition as needed.

Code Sample

The following code fragment illustrates how to do so. It uses a Custom class called sMystruct to define a set of variables and an array. The array name is Inventory_Onorder_Instock and it has an initial dimension of 1. The code redimensions the array to 2, and populates each element of the array with values from the Products table. Then it displays these values.

   CLEAR
   OPEN DATABASE C:\VFP\SAMPLES\DATA\TESTDATA.DBC
   USE C:\VFP\SAMPLES\DATA\PRODUCTS.DBF
   GO TOP
   PUBLIC DIMENSION oMyStruct(10)
   FOR i=1 to 10
       oMyStruct(i)=CREATEOBJECT("sMyStruct")
       oMyStruct(i).Product_Name=PRODUCTS.Prod_name
       oMyStruct(i).Engineer_Name=PRODUCTS.Eng_name
       oMyStruct(i).Cost_Per_Unit=PRODUCTS.Unit_cost
       DIMENSION oMyStruct(i).Inventory_Onorder_instock(2) && Re-dimension
       oMyStruct(i).Inventory_Onorder_instock(1)=PRODUCTS.On_order
       oMyStruct(i).Inventory_Onorder_instock(2)=PRODUCTS.In_stock
       ?oMyStruct(i).Product_Name
       ?oMyStruct(i).Engineer_Name
       ?oMyStruct(i).Cost_Per_Unit
       ?oMyStruct(i).Inventory_Onorder_instock(1)
       ?oMyStruct(i).Inventory_Onorder_instock(2)
       SKIP
   ENDFOR

   DEFINE CLASS sMyStruct AS CUSTOM
       Product_Name=''
       Engineer_Name=''
       Cost_Per_Unit=0
       DIMENSION Inventory_Onorder_Instock(1) && initial dimension is 1
   ENDDEFINE