Create object reference by name

I wish to disable and enable a bunch of controls on the front panel. Instead of creating hard-wired property nodes, I wish to cycle through an array of string names of controls and set the corresponding control's property. Is it possible to create a reference on the fly based on a string? The reference will then be fed to a Property node. Or is there an alternative way for my problem?

See the image below for a better example.
This one provides a list of all the controls on the front panel. See the names of the labels appears in the ArrayofCtrls.
RayR
You can create a subvi of this. Replace ThisVI by a control. You then wire This VI from the calling VI. Or, you can get fancy and wire a pathname to the appropriate function which replaces ThisVI in the above example. You can then obtain front panel listings for other VI's. The possibilities are alomost endless
Message Edited by JoeLabView on 01-08-2008 08:11 AM
Attachments:
_example.PNG ‏33 KB

Similar Messages

Create Object References for Key field

Hi Experts,
Question 1- Do we have any standard task that create BOR object reference using key field?
Question 2 - If not, i have created a task with key field as import parameter and BOR type as return object reference. No i am just using macro "SWC_CREATE_OBJECT OBJREF_ARD 'AssetRequestDocument' ASSETREQUESTID." where ASSETREQUESTID is key field. OBJREF_ARD is object ref type.
Problem comes here - Its not getting instantiated, i debugged an saw it checks for logical system in the FM OWN_LOGICAL_SYSTEM_GET, i guess since SWO_CREATE is remote enabled FM it is checking for OWN_LOGICAL_SYSTEM_GET function. In our system for the client there is no logical system defined and i dont have any idea how to customize table T000 for logical system.
Note - There is nothing related to communication between two system.
Can anyone help me out?
Thanks in Advance,
Pritam Kunal

Hello,
It's a method. You make a task which calls that method and passes in the BOR type and its key.
It instantiates an instance of the BOR and passes it back out.
So, no, it's not a generic BOR!
regards
Rick Bakker
Hanabi Technology

Is it posible to create objects with different names dinamically?

Hi,
I'm creating an app that manages different wireless nodes in a network and I was thinking that I could create a class called Node which would have a constructor that every time I created an object Node, I would pass the address and some other data about the Node and the constructor will save all that data and also create a unique ID for every Node object.
Now the problem is that I need to be able to discover all the nodes in my network every time the user clicks a Ping button. So every time the users clicks Ping I need to do a ping and create as many Node objects as nodes I have in my network. The thing is I don't know how to make it create the node objects with different names so after I've created all the nodes objects I can refer to one of them.
Something like this.
int Id=0;
id++;
Node node+Id = new Node();
I think its not possible to do something like that. If it isn't how can I do to refer to one of the objects I've created?
Thanks.

Twistx77 wrote:
Thanks to both of you. I'll check out the Link and if I can't find the solution there I'll make the array , I don't know how I didn't think about doing that. There are two collections you should study specifically:
First you have the ArrayList which in essense is a growable array. This means you don't have to decide in advance how big it can be.
Second there's the HashMap. It's sometimes called an associate array. Such an array doesn't have fixed position indexes like an ordinary array. Instead each index (called key) is associated with a value but the keys don't have any particular order. Still, given a certain key, finding the corresponding value in a HashMap is almost as fast as an array access.

Using string to create object reference?

How do I use a string to dynamically set an object reference?
For example, I have a pop up window with a function to set
the text of a text object in the main application:
Application.application.t1.text = completeString;
The "t1" is the object, of course. There are several such
objects, t2, t3, etc. I'd like to make this a variable item in the
popup, and pass the reference to WHICH text object (eg, "t1' or
"t2") from the popup's parent.
So, if the variable was something like "whichBox" (not sure
what to type it as), then I'm looking for something like:
Application.application.
whichBox.text = completeString;
Which I cannot get to work... what am I missing here?

perhaps you can try this...
Application.application[myParam].text
where myParam is a String var with the value of 'whichBox' or
whatever name you wanted.

Create object without instance name

hi
here is the problem , i have hero shoot bullets and because of that i cant give the objects an instance names and i wanna check if the object on the stage or not and that is easy when
i do    var bullet:BULLET = new BULLET
if (bullet.stage){
addChild(bullet)
but the problem that when i do like this
addChild(new BULLET())
i know that , flash give them a names but how can i check their names??
if(???.stage)
thank you

Per Ned's suggestion you should use some structure. Because it seems you will use animations of large numbers of objects - Vector is the best because it is faster than Array.
Here is an example in two iterations - first as timeline code (just paste it on timeline), and below - as document class - you can use it by placing it into the same directory as your fla and assign doc class to Shooter:
import flash.display.Sprite;
import flash.events.Event;
var bullets:Vector.<BULLET>;
init();
function init():void
    makeBullets();
    placeBullets();
    shoot();
function shoot():void
    addEventListener(Event.ENTER_FRAME, moveBullets);
function moveBullets(e:Event):void
    for each (var b:BULLET in bullets)
        b.x += 10;
function placeBullets():void
    var nextX:Number = 0;
    for each (var b:BULLET in bullets)
        addChild(b);
        b.y = stage.stageHeight * .5;
        b.x = nextX;
        nextX -= b.width * 2;
function makeBullets():void
    var numBullets:int = 500;
    bullets = new Vector.<BULLET>();
    while (numBullets--)
        bullets.push(new BULLET());
Class:
package
    import flash.display.Sprite;
    import flash.events.Event;
    public class Shooter extends Sprite
        private var bullets:Vector.<BULLET>;
        public function Shooter()
            init();
        private function init():void
            makeBullets();
            placeBullets();
            shoot();
        private function shoot():void
            addEventListener(Event.ENTER_FRAME, moveBullets);
        private function moveBullets(e:Event):void
            for each(var b:BULLET in bullets) {
                b.x += 10;
        private function placeBullets():void
            var nextX:Number = 0;
            for each(var b:BULLET in bullets) {
                addChild(b);
                b.y = stage.stageHeight * .5;
                b.x = nextX;
                nextX -= b.width * 2;
        private function makeBullets():void
            var numBullets:int = 500;
            bullets = new Vector.<BULLET>();
            while (numBullets--) {
                bullets.push(new BULLET());

Creating Objects with String name

How can i create an object, but just having the name as String?
Like, instead of creating like JInternalFrame obj = new MyInternalFrame(), do it like JInternalFrame obj = createObject("MyInternalFrame") ( i just gave createObject as example, ignore it)...
Does anyone knows how to do it? Because i have several windows, and by clicking, i dont want to be with a lot of if clauses checking each one to se wich one is the ritgh class to call...
Tks,
Bruno

You need the Class class in package java.lang, specifically class (static) method forName() and instance method newInstance():
JInternalFrame obj =
(JInternalFrame) Class.forName("MyInternalFrame").newInstance();

Cannot create weak reference to 'classobj' object

I am trying to run the python Script in a C# program using Iron Python I am getting this type of Error
cannot create weak reference to 'classobj' object
I am using this code for running the python code
var ironPythonRuntime = Python.CreateRuntime();
try
dynamic loadPython = ironPythonRuntime.UseFile("Program.py");
catch (Exception ex)
Console.WriteLine(ex.Message);

Hi Mahesh,
About IronPython issue, It's third-party product. Please redirect to IronPython forum. The link as below.
https://ironpython.codeplex.com/workitem/list/basic
After search this error,
this thread tells me.
Try to use virtualenv. It is used to separate many instances of python and it's libraries - you can have as many virtual environments as possible: python 2.5 , 2.6 , 2.7, whatever - with any combinations of libraries - so you can have for example five
python 2.6 instances with different sets of libraries configured.
By the way, here is also a blog talking about
Running IronPython Scripts from a C# 4.0 Program
Now I will move your thread to "off-topic" forum. Thanks for your understanding.
Best regards,
Kristin
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
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HERE to participate the survey.

How to create object by getting class name as input

hi
i need to create object for the existing classes by getting class name as input from the user at run time.
how can i do it.
for exapmle ExpnEvaluation is a class, i will get this class name as input and store it in a string
String classname = "ExpnEvaluation";
now how can i create object for the class ExpnEvaluation by using the string classname in which the class name is storted
Thanks in advance

i think we have to cast it, can u help me how to cast
the obj to the classname that i get as inputThat's exactly the point why you shouldn't be doing this. You can't have a dynamic cast at compile time already. It doesn't make sense. Which is also the reason why class.forName().newInstance() is a very nice but also often very useless tool, unless the classes loaded all share a mutual interface.

Create Object of "ObjectName" Class by giving only Domain Name.

Hie,
I want to create Object of "ObjectName" class without specifying its key value properties, but i want to only specify the domain name.
For eg:
ObjectName on=new ObjectName("jboss.ws4ee:*"); here jboss.ws4ee is the domain name and after colon(:) will come the key value properties.. i dont want to specify that because i want the list of all mbeans coming under this domain i.e. jboss.ws4ee
So anyone can plzzz help me..
Regards.

Hi,
What were you trying to do with that name?
ObjectName on=new ObjectName("jboss.ws4ee:*");
You cannot create an MBean with such an ObjectName. You can only
use it as first argument to queryNames() and queryMBeans();
If you want to get the attributes of all jboss MBeans then you will need to
do something like that:
final ObjectName pattern=new ObjectName("jboss.ws4ee:*");
for (ObjectName o : server.queryNames(pattern,null)) {
    System.out.println("MBean: " + o);
    for (MBeanAttributeInfo info : server.getMBeanInfo(o).getAttributes()) {
         final String attrname = info.getName();
         System.out.println("\t"+attrname+"="+server.getAttribute(o,attrname));
}(disclaimer: this code was eyed-compiled)
hope this helps,
-- daniel
JMX, SNMP, Java, etc...
http://blogs.sun.com/jmxetc

How to create a local object reference variable in teststand sequence file programatically using C#

I want to create a local object reference variable in a TestStand sequence file programatically using C#.

Hi,
Accoring to your reply in this Thread
http://forums.ni.com/ni/board/message?board.id=330&thread.id=26984
Just try this example. There you will create a numeric variable during excuting a sequence!
Hope this is what you are looking for.
Please attach all your questions here.
juergen
=s=i=g=n=a=t=u=r=e= Click on the Star and see what happens :-) =s=i=g=n=a=t=u=r=e=
Attachments:
CTestStandDialog.zip ‏31 KB

Create an object with the name passed in as a string argument to a method

Hi,
I am sorry if it's too trivial for this forum , but I am stuck with the following requirements.
I have a method
void abc(String object_name, String key, String value)
method abc should first check if there exists in memory a hashmap object with the name passed in as argument object_name.
If yes ..just put the key and value there.
if not , then create the hashmap object called <object_name> and insert the key/value there.
Can anybody help me in the first step i.e, how to check if an object exists with the name passed in and if not then create it.
Will getInstance method be of any help?
Thanks in advance for your response.
-Sub-java

Dear Cotton.m,
Thanks for your suggesstion. I will remember that.
But somehow I have a strong belief that you still need to consult dictionary for exact meaning of the words like "upset" , "frustration" etc. Not knowing something in a language , that too as a beginner, does not yield frustration, but increases curiosity. And people like petes1234 are there to diminish that appetite.
To clarify above, let me compare jverd's reply to my doubt with petes1234's.
jverd said it cannot be done and suggested a work around (It was perfect and worked for me) While petes1234 , having no work in hand probably, started analysis of newbies mistakes.
jverd solved my problem by saying that it cannot be done. petes1234 acted as a worthless critic in my opinion and now joined cotton.m.
Finally, this is a java forum and I do not want to discuss human characteristics here for sure.
My apologies if I had a wrong concept or if I chose a wrong forum to ask, where people like petes1234 or Cotton.m show their geekdom by pointing out "shortfalls" rather than clearing that by perfect examples and words.
Again take it easy and Cotton.m , please do not use this forum to figure out others' frustration but be a little more focussed on solving others "Java related" problems :)
-Sub-java

How to convert from Finder Object reference to POSIX path

I'm new to AppleScript. I'm super close to getting what I need done, but I've ran across a snag in the middle.
The error I'm getting is Can’t make quoted form of POSIX path of item 1 of {«class docf» \"filename\" of «class cfol» \"foldername\" of «class cfol» \"Desktop\" of «class cfol» \"Username\" of «class cfol» \"Users\" of «class sdsk» of application \"Finder\"} into type Unicode text. the problem area is highlighted and notated below. I've looked all around online but can't find what I need.
Thanks in advance for any and all help!
set text item delimiters to "."
tell application "Finder"
set theFilestoChoose to every item of (choose file with prompt "Please select the file(s) you would like to move and rename" with multiple selections allowed) as list
display dialog "Would you like to move these files to an existing folder and then rename them, or create a new folder and then rename them?" buttons {"Move to an existing folder and rename", "Create a new folder and rename"}
if result = {button returned:"Move to an existing folder and rename"} then
set firstnewname to "Aauuttoommaattoorr"
repeat with index from 1 to the count of theFilestoChoose
set theFilesChosenbeingrenamedfirsttime to item index of theFilestoChoose
set filenamecount to text items of (get name of theFilesChosenbeingrenamedfirsttime)
if number of filenamecount is 1 then
set fileextension to ""
else
set fileextension to "." & item -1 of filenamecount
end if
set the name of theFilesChosenbeingrenamedfirsttime to firstnewname & index & fileextension as string
end repeat
log theFilesChosenbeingrenamedfirsttime
set choosingtheplacetomove to choose folder with prompt "Select the folder to move to"
set thechosenfoldersname to name of folder choosingtheplacetomove -- sets the folder name as text
set AppleScript's text item delimiters to {"-"}
set Numberofthemonthatthebeginningofthefoldername to text item 1 of thechosenfoldersname as string -- for later to append the number back on without having to ask again!
set shortenedname to text item 2 of thechosenfoldersname as string
set the name of choosingtheplacetomove to shortenedname as string
set thefolderstemporarynameaslocation to choosingtheplacetomove as string
move theFilestoChoose to folder thefolderstemporarynameaslocation
log theFilestoChoose
set allfilesindestinationfolder to every file in choosingtheplacetomove as alias list --
set aInitials to the text returned of (display dialog "Whose camera were this/these pictures taken on?" default answer "")
set filteredList to my filterList(allfilesindestinationfolder, aInitials) as list
log filteredList
-- everything above this is correct so far and works perfect
--TROUBLE SECTION BELOW
set theSortedfilterList to (sort filteredList by creation date) -- something happens here with the theSortedfilterList that makes it unintelligible to convert to POSIX later. but I need the files in the order that this line puts them.
log theSortedfilterList
set timetorenamelasttime to theSortedfilterList
set newbasename to shortenedname
repeat with index from 1 to the count of timetorenamelasttime
set theonefile to item index of timetorenamelasttime
set theonefilenamecount to text items of (get name of theonetwothreefile)
if number of theonefilenamecount is 1 then
set fileextensionone to ""
else
set fileextensionone to "." & item -1 of theonefilenamecount
end if
tell application "System Events" to set CreaDate to creation date of file theonefile
set CreaDate2 to CreaDate as text -- need to trim down to the first 10 characters and eliminate the "-"
set AppleScript's text item delimiters to {""}
set shorteneddatename to text items 1 thru 10 of CreaDate2 as string
set the name of theonefile to shorteneddatename & {"-"} & newbasename & {"-"} & aInitials & {"-"} & index & fileextensionone as string
end repeat
--Trouble section above
set the name of choosingtheplacetomove to Numberofthemonthatthebeginningofthefoldername & "-" & shortenedname as string -- returns the month prefix to the foldername
else if result = {button returned:"Create a new folder and rename"} then
set repeatConfirmation to true --Boolean to decided if script should be repeated; default is to repeat
repeat while (repeatConfirmation = true) --Repeat if Any Tests Are Failed
set thefirstquestion to choose from list {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"} with title "Event Month Selection" with prompt "Select the month in which the event started. Select only one month:"
set theMonthAnswer to result
if theMonthAnswer = false then --"For historical reasons, choose from list is the only dialog command that returns a result (false) instead of signaling an error when the user presses the “Cancel” button."
set repeatConfirmation to false
set exitingeventmonth to display dialog ("You are exiting selecting the event month phase of the program. You will need to manually fix this decision") buttons {"OK"} with title "Exiting Event Month Selection"
if button returned of exitingeventmonth = "OK" then
set theMonthAnswer to ""
end if
else
set confirmationanswer to display dialog "You selected " & theMonthAnswer & ", is this correct? " buttons {"Yes, that's correct.", "No, the picture(s) are from a different month."} with title "Confirm Event Month Selection"
if button returned of confirmationanswer = "Yes, that's correct." then
set repeatConfirmation to false
else
display dialog ("That's okay, you can select another again!") buttons {"OK"} with title "Return to Event Month Selection"
end if
end if
end repeat
log theMonthAnswer
if theMonthAnswer = "" then
set monthtonumber to "You have cancelled this action."
log monthtonumber
else if theMonthAnswer = {"January"} then
set monthtonumber to "01"
log monthtonumber
else if theMonthAnswer = {"February"} then
set monthtonumber to "02"
log monthtonumber
else if theMonthAnswer = {"March"} then
set monthtonumber to "03"
log monthtonumber
else if theMonthAnswer = {"April"} then
set monthtonumber to "04"
log monthtonumber
else if theMonthAnswer = {"May"} then
set monthtonumber to "05"
log monthtonumber
else if theMonthAnswer = {"June"} then
set monthtonumber to "06"
log monthtonumber
else if theMonthAnswer = {"July"} then
set monthtonumber to "07"
log monthtonumber
else if theMonthAnswer = {"August"} then
set monthtonumber to "08"
log monthtonumber
else if theMonthAnswer = {"September"} then
set monthtonumber to "09"
log monthtonumber
else if theMonthAnswer = {"October"} then
set monthtonumber to "10"
log monthtonumber
else if theMonthAnswer = {"November"} then
set monthtonumber to "11"
log monthtonumber
else if theMonthAnswer = {"December"} then
set monthtonumber to "12"
log monthtonumber
end if
set theNameofFoldertoMake to text returned of (display dialog "Please enter the name of the new folder you are creating:" default answer "" with title "New Folder Name")
set LocationOfNewFolder to choose folder with prompt "Choose the location of the new folder you are creating:"
set theNewNameofFoldertoMake to monthtonumber & "-" & theNameofFoldertoMake
set newfolderaction to make new folder at LocationOfNewFolder with properties {name:theNewNameofFoldertoMake}
move theFilestoChoose to newfolderaction
end if
end tell
--function
on filterList(allfilesindestinationfolder, aInitials)
set patterns to {aInitials as string, "Aauuttoommaattoorr"}
set output to {}
repeat with aFile in the allfilesindestinationfolder
repeat with aPattern in patterns
set filepath to aFile as string
if filepath contains aPattern then
set end of the output to aFile
exit repeat
end if
end repeat
end repeat
return output
end filterList

Okay, so you wanted the debugging and error messages. Thank you for the coaching. Here is what I get from the following line:
set theSortedfilterList to (sort filteredList by creation date)
log theSortedfilterList
Log returns:
(*document file Aauuttoommaattoorr3.AVI of folder SnowDay of folder Desktop of folder Username of folder Users of startup disk, document file Aauuttoommaattoorr2.MOV of folder SnowDay of folder Desktop of folder Username of folder Users of startup disk, document file Aauuttoommaattoorr1.mov of folder SnowDay of folder Desktop of folder Username of folder Users of startup disk*)
set pxFile to POSIX path of ((theSortedfilterList) as alias)
Error: "Can’t make {«class docf» \"Aauuttoommaattoorr3.AVI\" of «class cfol» \"SnowDay\" of «class cfol» \"Desktop\" of «class cfol» \"Username\" of «class cfol» \"Users\" of «class sdsk» of application \"Finder\", «class docf» \"Aauuttoommaattoorr2.MOV\" of «class cfol» \"SnowDay\" of «class cfol» \"Desktop\" of «class cfol» \" Username \" of «class cfol» \"Users\" of «class sdsk» of application \"Finder\", «class docf» \"Aauuttoommaattoorr1.mov\" of «class cfol» \"SnowDay\" of «class cfol» \"Desktop\" of «class cfol» \" Username \" of «class cfol» \"Users\" of «class sdsk» of application \"Finder\"} into type alias." number -1700 from {«class docf» "Aauuttoommaattoorr3.AVI" of «class cfol» "SnowDay" of «class cfol» "Desktop" of «class cfol» "Username" of «class cfol» "Users" of «class sdsk», «class docf» "Aauuttoommaattoorr2.MOV" of «class cfol» "SnowDay" of «class cfol» "Desktop" of «class cfol» "Username" of «class cfol» "Users" of «class sdsk», «class docf» "Aauuttoommaattoorr1.mov" of «class cfol» "SnowDay" of «class cfol» "Desktop" of «class cfol» "Username" of «class cfol» "Users" of «class sdsk»} to alias
That is why I labeled it with Finder Object reference won’t return POSIX path, because I tried what was suggested about using the POSIX path of line. I thought seeing the lines above and around it would help set the context.
So I need those files, but I need them sorted by creation date so that they’re in that order for the next renaming step.

The following error text was processed in the system IDS : Access via 'NULL' object reference not possible.

Hi all ,
Im getting the below error , actually recently i created my own custom table zstudent, later i wrote select query to fetch data from the same and dump at internal table and then bind this to the table node.
But im getting below error, even i removed the select query still same error is occuring.
Error when processing your request
What has happened?
The URL http://********00.*****b.com:8000/sap/bc/webdynpro/sap/zdemo_student/ was not called due to an error.
Note
The following error text was processed in the system IDS : Access via 'NULL' object reference not possible.
The error occurred on the application server axsids00_IDS_00 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
Method: WDDOINIT of program /1BCWDY/YUSM2Q74A826Y0JY1I4V==CP
Method: IF_WDR_COMPONENT_DELEGATE~WD_DO_INIT of program /1BCWDY/YUSM2Q74A826Y0JY1I4V==CP
Method: DO_INIT of program CL_WDR_DELEGATING_COMPONENT===CP
Method: INIT_CONTROLLER of program CL_WDR_CONTROLLER=============CP
Method: INIT_CONTROLLER of program CL_WDR_COMPONENT==============CP
Method: INIT of program CL_WDR_CONTROLLER=============CP
Method: INIT of program CL_WDR_CLIENT_COMPONENT=======CP
Method: INIT of program CL_WDR_CLIENT_APPLICATION=====CP
Method: IF_WDR_RUNTIME~CREATE of program CL_WDR_MAIN_TASK==============CP
Method: HANDLE_REQUEST of program CL_WDR_CLIENT_ABSTRACT_HTTP===CP

Thanks Rama,
Acutally i accidentally commented the lo_nd_student = wd_context ....etc
this line was commented .
i have one small requirement to fetch data from local customised table and fill the same to internal table and bind that to table node.
my table node is student having attributes as name , city and number , all are of type strings.
now i created one custom table zstudent having ID - char of length 10,
name of type string
city of type string
num of type string
i have inserted records
but when i use select query to fill data from this zstudent to my internal table of type lt_student type wd_this->elements_student ,
im getting same above error.

Object reference not set to an instance of an object error when generating a schema using flat file schema wizard.

I have a csv file that I need to generate a schema for. I am trying to generate a schema using flat file schema wizard but I keep getting "Object reference not set to an instance of an object." error when I am clicking on the Next button after
specifying properties of the child elements on the wizard. At the end I get schema file generated but it contains an empty root record with no child elements.
I thought may be this is because I didn't have my project checked out from the Visual SourceSafe db first but I tried again with the project checked out and got the same error.
I also tried creating a brand new project and generating a schema for it but got the same error.
I am not sure what is causing Null Reference exception to be thrown and there is nothing in the Windows event log that would tell me more about the problem.
I am using Visual Studio 2008 for my BizTalk development.
I would appreciate if some has any insides on this issue.

Hi,
To test your environment, create a new BizTalk project outside of source control.
Create a simple csv file on the file system.
Name,City,State
Bob,New York,NY
Use the Flat file schema Wizard to create the flat file schema from your simple csv instance.
Validate the schema.
Test the schema using your csv instance.
This will help you determine if everything is ok with you environment.
Thanks,
William

Access via 'NULL' object reference not possible   - GET_RANGE_TABLE_OF_SEL_

Hi Guru's,
   i am new for WebDynpro programming.I am trying to use select-options tutorial.
System showing select options and table binding on screen when i test the application.
I have using search button to get the value which user will i/p.for that onaction method created, i have writen the code to get the values which user will input.
Method given below is of componentcontroler
method wddoinit .
data: lt_range_table type ref to data,
        rt_range_table type ref to data,
        read_only type abap_bool,
        lt_range_table1 type ref to data.
data: lr_componentcontroller type ref to ig_componentcontroller,
        l_ref_cmp_usage type ref to if_wd_component_usage.
create the used component
l_ref_cmp_usage = wd_this->wd_cpuse_select_options( ).
if l_ref_cmp_usage->has_active_component( ) is initial.
    l_ref_cmp_usage->create_component( ).
endif.
wd_this->m_wd_select_options = wd_this->wd_cpifc_select_options( ).
wd_this->m_handler = wd_this->m_wd_select_options->init_selection_screen( ).
wd_this->m_handler->set_global_options(
                          i_display_btn_cancel = abap_false
                          i_display_btn_check   = abap_false
                          i_display_btn_reset   = abap_false
                          i_display_btn_execute = abap_false ).
lt_range_table = wd_this->m_handler->create_range_table( i_typename = 'S_CARR_ID' ).
wd_this->m_handler->add_selection_field( i_id = 'CARRID'
it_result = lt_range_table i_read_only = read_only ).
call method wd_this->m_handler->add_horizontal_divider
    exporting
      i_id = 'LINE'.
endmethod.
Method given below is of VIEW.
method ONACTIONSEARCH .
DATA: NODE_FLIGHTS TYPE REF TO IF_WD_CONTEXT_NODE.
DATA: RT_CARRID TYPE REF TO DATA.
DATA: ISFLIGHT TYPE TABLE OF SFLIGHT.
DATA: WSFLIGHT TYPE SFLIGHT.
FIELD-SYMBOLS: <FS_CARRID> TYPE TABLE.
Retrieve the data from the select option
RT_CARRID = WD_THIS->M_HANDLER->GET_RANGE_TABLE_OF_SEL_FIELD( I_ID = 'S_CARR_ID' ).
Assign it to a field symbol
ASSIGN RT_CARRID->* TO <FS_CARRID>.
CLEAR ISFLIGHT. REFRESH ISFLIGHT.
SELECT * INTO CORRESPONDING FIELDS OF TABLE ISFLIGHT FROM SFLIGHT
                       WHERE CARRID IN <FS_CARRID>.
NODE_FLIGHTS = WD_CONTEXT->GET_CHILD_NODE( NAME = `FLIGHTS` ).
NODE_FLIGHTS->BIND_ELEMENTS( ISFLIGHT ).
endmethod.
while executing appln. error is trigger on line given below
RT_CARRID = WD_THIS->M_HANDLER->GET_RANGE_TABLE_OF_SEL_FIELD( I_ID = 'S_CARR_ID' ).
Err: The following error text was processed in the system BCD : Access via 'NULL' object reference not possible.
please help me out on this issue.
Thanks and Regards
Vinayak Sapkal

hi ,
The attribute M_HANDLER is an attirbute of component controller (as told by your post) and so you cannot access it as you have done it.
You will have to access it as .
WD_COMP_CONTROLLER->M_HANDLER->GET_RANGE_TABLE_OF_SEL_FIELD(I_ID = 'S_CARR_ID' ).
Try doing it.
Or else , if you have created a similar attribute in your view itself , then it is "INITIAL" and hence you are getting the dump.
You will have to assign the view attribute "M_HANDLER" with the value of your component controller attribute "M_HANDLER" ,because all the initializations are done in WDDOINIT of comp controller and on component controller atribute "M_HANDLER".
Thanks,
aditya.

Create object reference by name

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