4D v13.4
ARRAY POINTER
- 4D Language Reference
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- Arrays
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- Arrays
- Creating Arrays
- Arrays and Form Objects
- Arrays and the 4D Language
- Arrays and Pointers
- Using the element zero of an array
- Two-dimensional Arrays
- Arrays and Memory
- APPEND TO ARRAY
- ARRAY BOOLEAN
- ARRAY DATE
- ARRAY INTEGER
- ARRAY LONGINT
- ARRAY PICTURE
- ARRAY POINTER
- ARRAY REAL
- ARRAY STRING
- ARRAY TEXT
- ARRAY TO LIST
- ARRAY TO SELECTIONUpd
- BOOLEAN ARRAY FROM SET
- COPY ARRAY
- Count in array
- DELETE FROM ARRAY
- DISTINCT VALUES
- Find in array
- INSERT IN ARRAY
- LIST TO ARRAY
- LONGINT ARRAY FROM SELECTION
- MULTI SORT ARRAY
- SELECTION RANGE TO ARRAYUpd
- SELECTION TO ARRAYUpd
- Size of array
- SORT ARRAY
- TEXT TO ARRAYNew
ARRAY POINTER
| ARRAY POINTER ( arrayName ; size {; size2} ) | ||||||||
| Parameter | Type | Description | ||||||
| arrayName | Array |
|
Name of the array | |||||
| size | Longint |
|
Number of elements in the array, or Number of rows if size2 is specified | |||||
| size2 | Longint |
|
Number of columns in a two-dimensional array | |||||
The ARRAY POINTER command creates or resizes an array of Pointer elements in memory.
- The arrayName parameter is the name of the array.
- The size parameter is the number of elements in the array.
- The size2 parameter is optional; if size2 is specified, the command creates a two-dimensional array. In this case, size specifies the number of rows and size2 specifies the number of columns in each array. Each row in a two-dimensional array can be treated as both an element and an array. This means that while working with the firt dimension of the array, you can use other array commands to insert and delete entire arrays in a two-dimensional array.
While applying ARRAY POINTER to an existing array:
- If you enlarge the array size, the existing elements are left unchanged, and the new elements are initialized to null pointer. This means that Nil applied to one of these elements will return True.
- If you reduce the array size, the last elements deleted from the array are lost.
This example creates a process array of 100 Pointer elements:
ARRAY POINTER(apValues;100)This example creates a local array of 100 rows of 50 Pointer elements:
ARRAY POINTER($apValues;100;50)This example creates an interprocess array of Pointer elements and sets each element pointing to the table whose number is the same as the element. The size of the array is equal to the number of tables in the database. In the case of a deleted table, the row will return Nil.
ARRAY POINTER(◊apValues;Get last table number)
For($vlElem;1;Size of array(◊apValues);1;-1)
If(Is table number valid($vlElem))
◊apValues{$vlElem}:=Table($vlElem)
End if
End for
Product: 4D
Theme: Arrays
Number:
280
Created: < 4D v6
