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  • When should indirection be used?
  • Identifying the current object
  • Indirection on a structure
  • Using the indirection on the paths in an XML document
  • Limitations
  • Indirections in Java
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Stored procedures
The { and } operators are used to access a control, a variable, a class member or a file item by dynamically building the name of control, variable, class member or item.
The { and } operators present several benefits:
  • Passing in parameter the name of a control, variable, class member or item.
  • Building the name of a control, variable, class member or item by programming.
Java Indirections cannot be performed local variables. Indirections can only be performed on global variables only. An indirection on a local variable of a process will trigger an "unknown element" error.
Example
// Simple indirection
{"NAME"} = CustName               // Is equivalent to NAME=CustName
{"NAME"} = {"CU.CUSTNAME"}        // Is equivalent to NAME=CU.CUSTNAME
{"CUSTWIN.NAME"} = CustName        // Is equivalent to CUSTWIN.NAME=CustName
{"CUSTWIN"+".NAME"} = CustName     // Is equivalent to CUSTWIN.NAME=CustName
 
// Typed indirection
{"Name",indControl} = CustName
 
// Indirection with a file name in a variable
nFileName is string = "Customer"
{nFileName + ".Name"} = "Smith"
HAdd({nFileName})
// Indirection in a procedure
ControlName is string
ControlName = "EDT_EDIT1" // EDT_EDIT1 is the name of the control
// Call to a procedure used to make a control invisible
Make_Invisible(ControlName)
 
PROCEDURE Make_Invisible(ControlN)
{ControlN}..State = Invisible
// Indirection with variable
AliasName is string
AliasName = PreviousWin()
// NAME is the name of the control
// CustName is the value to assign
{AliasName+".NAME"} = CustName
Abbrev is string
ItemName is string
{Abbrev+"."+ItemName} = CustName
{Abbrev+"."+ItemName} = {ControlName}
// Declare a class with two members
MyClass is Class
Member1 is string
Member2 is string
// Display the value of a member
GLOBAL procedure DisplayMember(Number)
// Retrieve the value of the selected global member
Value is string = {"::Member"+Number}
Info(Value)
c is cWord
var is Variable Description
Def is Definition
 
Def = GetDefinition(c)
// Retrieves the 2nd variable of the class: version of Word
var = Def..Variable[2]
 
Trace(var..Name) // Displays the variable name
Trace("Version of Word: ",{c, var}) // Displays the Word version
Syntax

Simple indirection Hide the details

{ <Expression> }
<Expression>: Character string
Expression used to identify the control, the variable or the item to use. The element is sought:
  • among the variables,
  • according to the number of dots found in the name:
    • 0 dot: search among the controls, then the HFSQL items.
    • 1 dot: search among the HFSQL items, the controls, then the query parameters.
    • greater than 1 dot: search among the controls.
  • among the special elements kept for compatibility (_Tabx for example, ...).
A WLanguage error occurs if this expression corresponds to an empty string ("").

Indirection on a class member Hide the details

{ <Expression> }
<Expression>: Character string
Expression used to identify the class member.
If the member is:
  • global, use the following syntax: {" :: MemberName"}
  • not global, use the following syntax: {" : MemberName"}
A WLanguage error occurs if this expression corresponds to an empty string ("").

Indirection on a class member Hide the details

{ <Class> , <Member> }
<Class>: Character string
Class instance
<Member>: Character string or Variable Description variable
Corresponds to:

Indirection by specifying the element type (optimizes the execution speed) Hide the details

{ <Expression>, <Type> }
<Expression>: Character string
Expression used to identify the control, the variable or the item to use. A WLanguage error occurs if this expression corresponds to an empty string ("").
<Type>: Constant
Constant used to specify the type of sought element:
indControlElement sought among the controls and the groups.
indConnectionElement sought among the connections.
indReportElement sought among the reports.
indWindowElement sought among the windows.
indFileElement sought among the files.
indGPWElement sought among the elements of user groupware (used to retrieve the initial status of controls).
indLinkElement sought among the links.
indQueryParameterElement sought among the parameters of queries.
indItemElement sought among the items.
indVariableElement sought among the variables.
Java The element is only sought within the global variables.
indPageElement sought among the pages.
Remarks

When should indirection be used?

The indirection can be used for example:
  • To access the value of an element (control, variable, item, ...):
    {s_ControlName} = 10
    ControlValue = {s_ControlName}
  • To use a property:
    {s_ControlName}..Height = 10
  • To programmatically handle a column of a Table control:
    {s_ColumnName, indControl}[Row_Number] = 10
  • To handle a table column:
    {s_TableName + "." +s_ColumnName, indControl}[Row_Number] = 10
WINDEVWindowsUniversal Windows 10 AppJavaUser code (UMC)

Identifying the current object

To identify the current object, use the following keywords:
  • MySelf: the current control
  • MyWindow: the current window
  • MyPage: the current page
    Universal Windows 10 AppJava This keyword is not available.
  • MyReport: the current report
    Java This keyword is not available.
  • MySource: the current data source.
  • MyFile: the file that released the current trigger.
WINDEVWindowsUniversal Windows 10 AppJavaUser code (UMC)

Indirection on a structure

An indirection cannot contain an access to a structure or to a class instance. However, the following syntax can be used:
{<Structure Variable>}: member
WINDEVWindowsUniversal Windows 10 AppJavaUser code (UMC)

Using the indirection on the paths in an XML document

The indirection operators can be used to build the path of an element in an XML document.
Example:
sXMLDoc is string = [
<?xml version="1.0" encoding="UTF-8"?>
<Document>
<VersionInfo>
<Version>21</Version>
<Year>2016</Year>
</VersionInfo>
</Document>
]
 
xmlExample is xmlDocument = XMLOpen(sXMLDoc, fromString)
 
sParam is string = "WINDEV_Param"
 
// Direct reading of information ...
Trace(xmlExample.Document.VersionInfo.Version)
 
// Reading with part of XML path found in a variable
// (idem if file item, window parameter, method, ...)
sParameter is string = "VersionInfo"
Trace ({"xmlExample.Document." + sParameter + ".Version"})
WINDEVWindowsUniversal Windows 10 AppJavaUser code (UMC)

Limitations

The indirection operator allows you to find an element by its name.
Therefore, the following operations are not allowed in an indirection:
  • access to a member of a class instance or structure instance other than the instance of current class (: and:: ).
  • access to a subelement in a control or array ([] operator).
  • access to a substring ([[]] operator).
  • access to a property (.. operator).
  • indirection ({ } operator).
  • call to a procedure or to a method of Automation object.
  • declaring a variable.
Remarks:
  • The operators for accessing an element (: and [] and [[]] and .. ) can be used on the element obtained by indirection. For example:
    { <indirection> }: member

    { <indirection> } [subscript]

    { <indirection> } [[ subscript ]]

    { <indirection> }..property
  • To call a procedure identified by its name, use Execute or ExecuteProcess.
  • To combine these operations dynamically, you have the ability to use the dynamic compilation (see Compile).
Java

Indirections in Java

Indirections are not supported by local variables
Minimum version required
  • Version 9
This page is also available for…
Comments
Example Use
//exemplo de indirection
gJanela01 is string = gJanela + "."+gLooper+"["+gLinha+"]."+gAttFoto
{gJanela01,indControl} = gsCheminDernièreCapture

HReset(pomv_parte_objeto_mov_local)
Busca is Buffer = HBuildKeyValue(pomv_parte_objeto_mov_local,chavecomposta, gEquipamento,gRegid_cab,gRegid_Item)
IF HReadSeek(pomv_parte_objeto_mov_local,chavecomposta,Busca,hIdentical) = True
IF HFound(pomv_parte_objeto_mov_local) = True
pomv_parte_objeto_mov_local.e001_id = gEquipamento
pomv_parte_objeto_mov_local.pocb_id = gRegid_cab
pomv_parte_objeto_mov_local.poit_id = gRegid_Item
pomv_parte_objeto_mov_local.pomv_data_emi = DateSys()+TimeSys()
pomv_parte_objeto_mov_local.pomv_foto = dLoadImage(gsCheminDernièreCapture,imgDefault)
IF HModify(pomv_parte_objeto_mov_local) = True THEN
gJanela01 = gJanela + "."+gLooper
LooperDisplay({gJanela01,indControl},taInit)
END
END
END
Boller
15 Apr. 2021