RESOLVE POINTER

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4D v15

RESOLVE POINTER

RESOLVE POINTER ( aPointer ; varName ; tableNum ; fieldNum )

Parameter	Type		Description
aPointer	Pointer	->	Pointer for which to retrieve the referenced object
varName	String	<-	Name of referenced variable or empty string
tableNum	Longint	<-	Number of referenced table or array element, or 0 or -1
fieldNum	Longint	<-	Number of referenced field, or 0 or -1

Description

Theme: Language

Starting with 4D v15, pointers to two-dimensional arrays are supported. For example, you can now write ->a{1}{2}.

As a result, when passing a pointer to an element of a two-dimensional array, the fieldNum parameter receives the element number of the second dimension. Also, RESOLVE POINTER now returns -1 instead of 0 in fieldNum for pointers to variables and single-dimension arrays.

The result table is now:

Referenced object	Parameters
	varName	tableNum	fieldNum
...
Variable	Name of the variable	-1	-1
Array element	Name of the array	Element number	-1
2D Array element	Name of the 2D array	Row element number	Column element number
...

Example

Here is an example of a 2D array pointer:

 ARRAY TEXT(atCities;100;50)

 C_POINTER($city)

 atCities{1}{2}:="Rome"

 atCities{1}{5}:="Paris"

 atCities{2}{6}:="New York"

  // ...other values

 $city:=->atCities{1}{5}

 RESOLVE POINTER($city;$var;$rowNum;$colNum)

  //$var="atCities"

  //$rowNum="1"

  //$colNum="5"