Can I use classes and objects to create my own package in LabVIEW?

Hi....I am writing my thesis on develpoing a simulation package. I am trying to compare simulation packages and their feautures as a scope of my project. Does anyone know if LabVIEW allows users to create their own toolboxes like MATLAB?...i mean something that can be done in object-oriented programming by making classes and objects.
thanks guys

The short answer is yes. NI sells toolkits. There's also OpenG. How you code the guts is up to you - you can do it non-LVOOP or LVOOP.

Similar Messages

Can I use classes and methods for a maintenance view events?

Hello experts,
Instead of perform/form, can I instead use classes and methods, etc for a given maintenance view event, lets say for example I want to use event '01' which is before saving records in the database. Help would be greatly appreciated. Thanks a lot guys!

Hi viraylab,
1. The architecture provided by maintenance view
   for using EVENTS and our own code inside it -
   It is provided using FORM/PERFORM
   concept only.
2. At this stage,we cannot use classes.
3. However, inside the FORM routine,
   we can write what ever we want.
   We can aswell use any abap code, including
   classes and methods.
(But this classes and methods won't have any
   effect on the EVENT provided by maintenance view)
regards,
amit m.

Using Class and Constructor to create instances on the fly

hi,
i want to be able to create instances of classes as specified by the user of my application. i hold the class names as String objects in a LinkedList, check to see if the named class exists and then try and create an instance of it as follows.
the problem im having is that the classes i want to create are held in a directory lower down the directory hierarchy than where the i called this code from.
ie. the classes are held in "eccs/model/behaviours" but the VM looks for them in the eccs directory.
i cannot move the desired classes to this folder for other reasons and if i try to give the Path name to Class.forName() it will not find them. instead i think it looks for a class called "eccs/model/behaviours/x" in the eccs dir and not navigate to the eccs/model/behaviours dir for the class x.
any ideas please? heres my code for ye to look at in case im not making any sense:)
//iterator is the Iterator of the LinkedList that holds all the names of the
//classes we want to create.
//while there is another element in the list.
while(iterator.hasNext())
//get the name of the class to create from the list.
String className = (String) iterator.next();
//check to see if the file exists.
if(!doesFileExist(className))
System.out.println("File cannot be found!");
//breake the loop and move onto the next element in the list.
continue;
//create an empty class.
Class dynamicClass = Class.forName(className);
//get the default constructor of the class.
Constructor constructor = dynamicClass.getConstructor(new Class[] {});
//create an instance of the desired class.
Behaviour beh = (Behaviour) constructor.newInstance(new Object[] {});
private boolean doesFileExist(String fileName)
//append .class to the file name.
fileName += ".class";
//get the file.
File file = new File(fileName);
//check if it exists.
if(file.exists())
return true;
else
return false;
}

ok ive changed it now to "eccs.model.behaviours" and it seems to work:) many thanks!!!
by the following you mean that instead of using the method "doesFileExist(fileName)" i just catch the exception and throw it to something like the System.out.println() ?
Why don't you simply try to call Class.forName() and catch the exception if it doesn't exist? Because as soon as you package up your class files in a jar file (which you should) your approach won't work at all.i dont think il be creating a JAR file as i want the user to be able to create his/her own classes and add them to the directory to be used in the application. is this the correct way to do this??
again many thanks for ye're help:)

ALV using ABAP Classes and Objects

Hi All,
I am trying to print the values in my internal table using ALV, using ABAP classes and objects. Here the title for columns are picked based on the title specified in the data element. I want to set the title of my columns by my own. how to achieve this ?. Please provide me a sample code if possible.
thanks & regards,
Navneeth.K

Hello Navneeth
The following sample report shows how to build and modify a fieldcatalog (routine <b>BUILD_FIELDCATALOG_KNB1</b>).
*& Report ZUS_SDN_ALVGRID_EVENTS
REPORT zus_sdn_alvgrid_events.
DATA:
gd_okcode        TYPE ui_func,
gt_fcat          TYPE lvc_t_fcat,
go_docking       TYPE REF TO cl_gui_docking_container,
go_grid1         TYPE REF TO cl_gui_alv_grid.
DATA:
gt_knb1          TYPE STANDARD TABLE OF knb1.
PARAMETERS:
p_bukrs      TYPE bukrs DEFAULT '2000' OBLIGATORY.
*       CLASS lcl_eventhandler DEFINITION
CLASS lcl_eventhandler DEFINITION.
PUBLIC SECTION.
    CLASS-METHODS:
      handle_hotspot_click FOR EVENT hotspot_click OF cl_gui_alv_grid
        IMPORTING
          e_row_id
          e_column_id
          es_row_no
          sender.
ENDCLASS.                    "lcl_eventhandler DEFINITION
*       CLASS lcl_eventhandler IMPLEMENTATION
CLASS lcl_eventhandler IMPLEMENTATION.
METHOD handle_hotspot_click.
*   define local data
    DATA:
      ls_knb1     TYPE knb1,
      ls_col_id   TYPE lvc_s_col.
    READ TABLE gt_knb1 INTO ls_knb1 INDEX e_row_id-index.
    CHECK ( ls_knb1-kunnr IS NOT INITIAL ).
    CASE e_column_id-fieldname.
      WHEN 'KUNNR'.
        SET PARAMETER ID 'KUN' FIELD ls_knb1-kunnr.
        SET PARAMETER ID 'BUK' FIELD ls_knb1-bukrs.
        CALL TRANSACTION 'XD03' AND SKIP FIRST SCREEN.
      WHEN 'ERNAM'.
*        SET PARAMETER ID 'USR' FIELD ls_knb1-ernam.
*        NOTE: no parameter id available, yet simply show the priciple
        CALL TRANSACTION 'SU01' AND SKIP FIRST SCREEN.
      WHEN OTHERS.
*       do nothing
    ENDCASE.
*   Set active cell to field BUKRS otherwise the focus is still on
*   field KUNNR which will always raise event HOTSPOT_CLICK
    ls_col_id-fieldname = 'BUKRS'.
    CALL METHOD go_grid1->set_current_cell_via_id
      EXPORTING
        is_row_id    = e_row_id
        is_column_id = ls_col_id.
ENDMETHOD.                    "handle_hotspot_click
ENDCLASS.                    "lcl_eventhandler IMPLEMENTATION
START-OF-SELECTION.
SELECT        * FROM knb1 INTO TABLE gt_knb1
         WHERE bukrs = p_bukrs.
* Create docking container
CREATE OBJECT go_docking
    EXPORTING
      parent                      = cl_gui_container=>screen0
      ratio                       = 90
    EXCEPTIONS
      OTHERS                      = 6.
IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
* Create ALV grid
CREATE OBJECT go_grid1
    EXPORTING
      i_parent          = go_docking
    EXCEPTIONS
      OTHERS            = 5.
IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
* Set event handler
SET HANDLER:
    lcl_eventhandler=>handle_hotspot_click FOR go_grid1.
* Build fieldcatalog and set hotspot for field KUNNR
PERFORM build_fieldcatalog_knb1.
* Display data
CALL METHOD go_grid1->set_table_for_first_display
    CHANGING
      it_outtab       = gt_knb1
      it_fieldcatalog = gt_fcat
    EXCEPTIONS
      OTHERS          = 4.
IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
* Link the docking container to the target dynpro
CALL METHOD go_docking->link
    EXPORTING
      repid                       = syst-repid
      dynnr                       = '0100'
*      CONTAINER                   =
    EXCEPTIONS
      OTHERS                      = 4.
IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
* ok-code field = GD_OKCODE
CALL SCREEN '0100'.
END-OF-SELECTION.
*&      Module STATUS_0100 OUTPUT
*       text
MODULE status_0100 OUTPUT.
SET PF-STATUS 'STATUS_0100'.
* SET TITLEBAR 'xxx'.
ENDMODULE.                 " STATUS_0100 OUTPUT
*&      Module USER_COMMAND_0100 INPUT
*       text
MODULE user_command_0100 INPUT.
CASE gd_okcode.
    WHEN 'BACK' OR
         'END' OR
         'CANC'.
      SET SCREEN 0. LEAVE SCREEN.
    WHEN OTHERS.
ENDCASE.
CLEAR: gd_okcode.
ENDMODULE.                 " USER_COMMAND_0100 INPUT
*&      Form BUILD_FIELDCATALOG_KNB1
*       text
* --> p1        text
* <-- p2        text
FORM build_fieldcatalog_knb1 .
* define local data
DATA:
    ls_fcat        TYPE lvc_s_fcat.
CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
    EXPORTING
*     I_BUFFER_ACTIVE              =
      i_structure_name             = 'KNB1'
*     I_CLIENT_NEVER_DISPLAY       = 'X'
*     I_BYPASSING_BUFFER           =
*     I_INTERNAL_TABNAME           =
    CHANGING
      ct_fieldcat                  = gt_fcat
    EXCEPTIONS
      inconsistent_interface       = 1
      program_error                = 2
      OTHERS                       = 3.
IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
LOOP AT gt_fcat INTO ls_fcat
          WHERE ( fieldname = 'KUNNR' OR
                  fieldname = 'ERNAM' ).
    ls_fcat-hotspot = abap_true.
    ls_fcat-scrtext_s = '<short text>'. " short text of column
    ls_fcat-scrtext_m = '<medium text>'. " medium text of column
    ls_fcat-scrtext_l   = '<long text>'. " longtext text of column
    ls_fcat-tooltip      = '...'. " ALV control: Tool tip for column header
    ls_fcat-coltext    = '...'.   " ALV control: Column heading
    MODIFY gt_fcat FROM ls_fcat.
ENDLOOP.
ENDFORM.                    " BUILD_FIELDCATALOG_KNB1
Regards
Uwe

MAT error: 0xHEX is used a class and object...

Hi there,
playing around some more with MAT I ran into the following error with some of my dumps. All were taken on 1.5 SUN JVMs (running on either Solaris or Linux).
org.eclipse.mat.snapshot.SnapshotException: Error: 0x8d776450 is used as class and object simultaneously. Are you using a beta DLL for Sun JDK 1.4.2 to write the heap dump?
at org.eclipse.mat.hprof.HprofParserHandlerImpl.createRequiredFakeClasses(HprofParserHandlerImpl.java:191)
at org.eclipse.mat.hprof.HprofParserHandlerImpl.beforePass2(HprofParserHandlerImpl.java:89)
at org.eclipse.mat.hprof.HprofIndexBuilder.fill(HprofIndexBuilder.java:76)
at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.parse(SnapshotFactoryImpl.java:183)
at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.openSnapshot(SnapshotFactoryImpl.java:101)
at org.eclipse.mat.snapshot.SnapshotFactory.openSnapshot(SnapshotFactory.java:77)
at org.eclipse.mat.ui.internal.ParseHeapDumpJob.run(ParseHeapDumpJob.java:52)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Since the suggested problem (usage of JDK 1.4.2) is not the case: What else can I do to find out what is going on? Do I need any special switches for jmap? The dumps all were taken with the same command:
jmap -heap:format=b <pid>
Still, some work, some do not. Any suggestions?
bye, Michael

Hi Michael,
this smells like a bug. The easiest way again is to have a look at the dump. If you zip it, it should become smaller. I could also provide upload space. Right now, I am at the J1 in San Francisco so it might not be as easy for me to fix this.
Andreas.

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I am having a difficult time understanding what is wrong w/ my classes and objects. I've looked in two books and have messed around a bit. Here is what I am -attempting- to do.
I want to make a class called CLOTHING. In this class i want objects such as shirt and pants (for now).
these are the errors im getting:
.\Shirt.java:6: invalid method declaration; return type required
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               ^
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       ^
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location: class Shirt
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3 errors------------------------------------------------------------
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public class Clothing {
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          s.fillPolygon(shirts);
}from what i understand each object is essentially a method...
Here is the code for the java applet I'm making:
import java.awt.event.*;
import java.awt.*;
import java.applet.*;
public class MyClassHW extends Applet { // implements ActionListener, AdjustmentListener {
     Shirt myShirt;
     int size;
     public void init(){
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// <applet code = "MyClassHW.class" height = 300 width=300> </applet>thank you for your time and help. as always, your efforts are appriciated.

.\Shirt.java:6: invalid method declaration; return type required     public Shirt(int size){
I guess, public Shirt(int size) is constructor in class shirt. You have one int in this constructor. Shirt(int size)
Here you initialize your shirt with two int:
MyClassHW.java:10: cannot resolve symbolsymbol : constructor Shirt (int,int)location: class Shirt          myShirt = new Shirt(1,1);
Shirt(int size, int what?)
It's why it show such message.
But even if you fix it seems like you have very vague ideas about what you are doing.
As far as I understood you need three classes.
First applet Clothing:
public class Clothing extends Applet{
Shirt myShirt;
Pants myPants;
public void init() {
myShirt = new Shirt(1); // small shirt
myPants = new Pants(32, 40); // medium waist and long legs
Second and third your classes Shirt and Pants:
public class Shirt extends Object {
int size;
public Shirt(int s) {
size = s;
public int getSize () {
return size;
same for Pants, only you need two parameters for it or whatever you want.
You could design it diffrently if you want derive your Shirts and Pants from Clothing and then to use them in your applet. But, indeeed, you desperately have to do some serious reading, where authors are accurate in they definitions and stuff, because it's kind of complicated.

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Class and Object name change in the universe designer

Hello Experts
I have a confusion , I am just wondering if I devlop a bobj universe, lets say, based on SQL database and change the name of the class and object during the creation of the universe, will that fetch the data from d/base properly while running a query / report. Although universe class and object has different names than database now but the records are the same. Do we need to point the object to d/base object in some kind of different or special way .
To make my question more simple, In d/base table name is "Employee" whereas on universe side I create a class name "Staff" and at the same time field name in the database is "Emploee ID" whereas in the universe I named it "Badge number".
Please advise if that will make any difference while I run the query or Is there any kind of complication on the universe side that I should expect which I am not familiar with.
I would apprecite your response.
Best Regards

Hello experts,
Let me rephrase the issue with exact scenario.
I have a table names "REGION" with fields region id, region and country id.
I have another table name REGION_SLINE with fields SL_id, region id and Sales_revenue.
I created an equi join between these two tables based on region id field and checked the cardinality which is ok.
Now when I try to create a report based on sales revenue per customer ( "customer's first name" is an other field on CUSTOMER table), I dont get any result in the report and get a message that "No data to reterive"
Also please note that when I run a report which is sales revenue per region id, I get the result, seem slike these two tables REGION and REGION_SLINE can generate the report but sales revenue per customer report is not generated because customer first name is a field of another table.
I was just wondering if I need to write some kind of where clause in the object properties of region id which is used to create equi joon link.
I woulld appreciate your response.
Regards
Edited by: SAP_LCCHS on Jul 4, 2011 9:19 AM
Edited by: SAP_LCCHS on Jul 4, 2011 9:21 AM

List display for ALV using class and methods

Hi friends
I want the list display for the ALV using Class and methods
which class and methods i can use.
Here we can't use the REUSE_ALV_LIST_DISPLAY and also GRID
I was done GRID display using class and methods but i want only list display for using class.
plz Give me sample code of list display not for grid.
Thanks
Nani.

hi
please check with this code...
declare grid and container.
DATA : o_alvgrid TYPE REF TO cl_gui_alv_grid,
o_dockingcontainer TYPE REF TO cl_gui_docking_container,
i_fieldcat TYPE lvc_t_fcat,"fieldcatalogue
w_layout TYPE lvc_s_layo."layout
If any events like double click,etc., are needed we have to add additional functionality.
call the screen in program.
Then , create the container as follows
IF cl_gui_alv_grid=>offline( ) IS INITIAL.
CREATE OBJECT o_dockingcontainer
EXPORTING
ratio = '95'
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
create_error = 3
lifetime_error = 4
lifetime_dynpro_dynpro_link = 5
others = 6.
ENDIF.
CREATE OBJECT o_alvgrid
EXPORTING
i_parent = o_dockingcontainer.
Build the fieldcatalog
create a output structure in SEll for the ALV output
CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
EXPORTING
i_structure_name = <alv output>
CHANGING
ct_fieldcat = i_fieldcat[]
EXCEPTIONS
inconsistent_interface = 1
program_error = 2
OTHERS = 3.
IF sy-subrc <> 0.
MESSAGE i030."Error in building the field catalogue
LEAVE LIST-PROCESSING.
ENDIF.
*If you need to modify the field catalog,modify it using field sysmbols
*setting the layout
w_layout-grid_title = title.
w_layout-zebra = 'X'.
then displaying the output
CALL METHOD o_alvgrid->set_table_for_first_display
EXPORTING
i_save = 'A'
is_layout = w_layout
CHANGING
it_outtab = i_output[]
it_fieldcatalog = i_fieldcat[]
EXCEPTIONS
invalid_parameter_combination = 1
program_error = 2
too_many_lines = 3
OTHERS = 4.
IF sy-subrc <> 0.
MESSAGE i032 ."Error in Displaying
LEAVE LIST-PROCESSING.
ENDIF.
*After that in PAI of the screen, you need to free the *object while going back from the screen(according to *your requirement)
MODULE user_command_9001 INPUT.
CASE sy-ucomm.
WHEN 'EXIT' OR 'CANC'.
PERFORM f9600_free_objects:
USING o_alvgrid 'ALV' text-e02,
USING o_dockingcontainer 'DOCKING'
text-e01.
LEAVE PROGRAM.
ENDCASE.
ENDMODULE. " USER_COMMAND_9001 INPUT
*in the program, write the follwoing code
FORM f9600_free_objects USING pobject
value(ptype)
value(ptext).
DATA: l_objectalv TYPE REF TO cl_gui_alv_grid.
CASE ptype.
WHEN 'ALV'.
l_objectalv = pobject.
IF NOT ( l_objectalv IS INITIAL ).
CALL METHOD l_objectalv->free
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
OTHERS = 3.
CLEAR: pobject, l_objectalv.
PERFORM f9700_error_handle USING ptext.
ENDIF.
WHEN 'DOCKING'.
DATA: lobjectdock TYPE REF TO cl_gui_docking_container.
lobjectdock = pobject.
IF NOT ( lobjectdock IS INITIAL ).
CALL METHOD lobjectdock->free
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
OTHERS = 3.
CLEAR: pobject, lobjectdock.
PERFORM f9700_error_handle USING ptext.
ENDIF.
WHEN 'CONTAINER'.
DATA: lobjectcontainer TYPE REF TO cl_gui_container.
lobjectcontainer = pobject.
IF NOT ( lobjectcontainer IS INITIAL ).
CALL METHOD lobjectcontainer->free
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
OTHERS = 3.
CLEAR: pobject, lobjectcontainer.
PERFORM f9700_error_handle USING ptext.
ENDIF.
WHEN OTHERS.
sy-subrc = 1.
PERFORM f9700_error_handle USING
text-e04.
ENDCASE.
ENDFORM. " f9600_free_objects
FORM f9700_error_handle USING value(ptext).
IF sy-subrc NE 0.
CALL FUNCTION 'POPUP_TO_INFORM'
EXPORTING
titel = text-e03
txt2 = sy-subrc
txt1 = ptext.
ENDIF.
endform.
also check with this
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCSRVALV/BCSRVALV.pdf
Hope this helps
if it helped, you can acknowledge the same by rewarding
regards
dinesh

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Hello,
I've created a com server in python for which I do not have a type library. I am able to call functions for this application in Python, TCL, I'm sure VB, etc. without the type library.
Must I have a type library registered to use this COM object with Labview? I was hoping I could simply supply the name to the refnum (or the GUID) then call functions by passings strings to the invoke node. This does not seem to be possible - am I missing something?
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73,
Timothy

Timothy Toroni wrote:
> Thanks for the info, however their example is labview server and
> python client. I'm going the other way. It's good to know about
> LabPython though...
>
> As of now, it seems to be there is no way to use a COM object without
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atter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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I am currently interested in if there are any options to using classes and characteristics within standard reporting in SAP ECC. I know some reports have the selection critiera and allow for other fields to be added to reports. Does anyone know the reports that use classes and characteristics or have the ability to use them. Any help is appreciated.
Regards,

Consultant 01,
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Hi ZZZSUNNY,
Similar question is answered recently.Please find the below link which will helps you
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How can I use excel and word documents on my Ipad 2

There are apps such as Documents To Go which support reading/editting/creating those sorts of documents :
standard version - http://itunes.apple.com/us/app/documents-to-go-office-suite/id317117961?mt=8
premium version - http://itunes.apple.com/us/app/documents-to-go-premium-office/id317107309?mt=8

Can I use classes and objects to create my own package in LabVIEW?

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