How to read event triggered by FM "BP_EVENT_RAISE"

Hi Experts,
Is there any way by which i can come to know if a particular event has been triggered by above function Module programmatically (by any table read or Function module).
Thanks
Yogesh Gupta

Go to that Function Module from SE37 Transaction and click on button 'Where Used List', Select Programs, Classes, Function modules... You will get list of objects which have been used this Function Module.
Regards,
Satish

Similar Messages

How to find Event Triggering place in SAP.

Hello,
By looking at a developed Workflow. How do we find out the triggering point code written in SAP transaction. Is there something like WHERE USED LIST to find out the locatoin of Event triggering point?
Please assist.
Thanks,
JM

The other possibility(I Think) is that if the workflow is started by using a raising a event then I think you cna find the respective program name in the SWEL txn, by selecting the respective event name and BOR .
1. Execute txn SWEL.
2. Specify the create date and time and then Execute (F8).
3. Select the BOR and event name and click display.
4. On the new ascreen at the bottom you can find the program name, copy the program name and then navigate to Se38 txn and open the mainprogram in display mode and try to search the program by using the keyword EVENT.
It will display the point and location from where the event is raised...

How to read event viewer

I want to view all events as we can see through event viewer in administrative tool in control panel using a java program
how can i view application ,security ,system and w3c events as in events viewer in java program ???

Hi
AEM data is stored in SCOM, you can use sql commands to connect to SCOM db and get required data.
refer below for how to run sql query from PowerShell
http://technet.microsoft.com/en-us/library/cc281720.aspx
for SQL query for AEM refer below link
http://blog.scomfaq.ch/2013/05/14/scom-2012-custom-aem-reports/
http://blogs.technet.com/b/kevinholman/archive/2007/10/18/useful-operations-manager-2007-sql-queries.aspx
Note : you can retrieve AEM data from scom sdk but it will overload scom server, however scom sdk run sql query to get required data. you can use sql PowerShell commands to achieve the same
Regards
sridhar v

How to read iCal events from SQLite Cache file?

I need to figure out how to read event entries in the Cache file stored in /Library/Calenders/ as my actual events have been corrupted due to a file system problem. The example below shows the information I have for each entry, where the event in the entry was Bon Jovi Concert, however I am confused how I can read the date and time of the event, information I believe is stored as 218215639,219613081,219524400,219540600. Any help is greatly appreciated.
INSERT INTO "ZCALENDARITEM" VALUES(0,NULL,0,NULL,0,5,NULL,6,4039,NULL,0,0,0,0,0,0,2,23,0,0,0,0,6,0,21821563 9,219613081,219524400,219540600,NULL,NULL,NULL,NULL,NULL,'local_AFB8D342-2DAE-4F A1-A9A6-3FA9B28B5C7C','Bon Jovi Concert',NULL,NULL,NULL,'Europe/London',NULL,'0E17BBB6-0E76-4024-8DD7-60E43D38D 35B');

OK, here we go ... I hope. I have tried it on my iCal, with about 2000 entries, and it worked. I cannot guarantee that it will work for you.
Make a new text file from sql as before, but using this modified command to get additional data for each event:
sqlite3 Desktop/Hope 'select ZSTARTDATE, ZCALENDARITEM.ZTITLE, ZENDDATE, ZNODE.ZTITLE, ZISALLDAY, ZRECURRENCERULE, ZISDETACHED from ZCALENDARITEM inner join ZNODE on ZCALENDARITEM.ZCALENDAR = ZNODE.Z_PK where ZSTARTDATE not null' >hope.txt
I suggest you make a new user account, then copy the text file hope.txt and the script to the Public/Drop Box folder for that account. Log on to the new account and copy the two files from the drop box to the Desktop. Start iCal and make new calendars to match those in your ordinary account. Double click the script to open it in Script Editor and CHANGE THE DATE RANGE in the "set ThePeriod" line. Stand well back and click the run button. Every 50 records processed it will pop up a progress box, which will pop down again after a second. Go for lunch.
When it is finished see if things look OK in iCal. If they do export each of the calendars, copy them to the drop box of your normal account and return to your normal account to import them.
If there is an error make a note of the error message and line number, find that line in the text file, and post it here with a couple of lines either side.
Note that for recurring items iCal normally only makes a single event, the first occurrence, then uses a recurrence rule to calculate if the event should be displayed in the current window. If there are any recurring events in the period you have selected where the first occurrence is before the period they will not be recreated. Where however you have changed a single occurrence of a recurring event iCal makes a new, detached, event. Any of these in the period will be detected. If their original event was also in the period they will now appear in the iCal display as duplicates. For easy spotting of these, I have prefixed "XX-" to the title of any detached events.
AK
<pre style="font-family: 'Monaco', 'Courier New', Courier, monospace; overflow:auto; color: #222; background: #DDD; padding: 0.2em; font-size: 10px; width:400px">on run
set ThePeriod to {date ("jan 1 2008"), date ("dec 31 2008")} --CHANGE THIS BEFORE RUNNIN
set TheFile to open for access (path to desktop as text) & "temp.txt"
set TheContents to read TheFile --until return
close TheFile
set TheLines to paragraphs of TheContents
set OldDelim to AppleScript's text item delimiters
set AppleScript's text item delimiters to {"|"}
set LCount to 0
set ACount to 0
set RCount to 0
set DCount to 0
set SCount to 0
set HowMany to (count of TheLines)
try
repeat with ThisLine in TheLines
if (count of ThisLine) is 0 then exit repeat
-- Start Date, Title, End Date, Calendar, All Day, Recurs, Detached
set LCount to LCount + 1
set Details to text items of ThisLine
set MyStartDate to FixMyDate(item 1 of Details)
set MyTitle to item 2 of Details
set MyEndDate to FixMyDate(item 3 of Details)
set MyCalendar to item 4 of Details
set MyAllDay to item 5 of Details
set MyRecurs to item 6 of Details
set MyDetached to item 7 of Details
if MyAllDay is "1" then set ACount to ACount + 1
if (count of MyRecurs) > 0 then set RCount to RCount + 1
if MyDetached is "1" then set MyTitle to "XX-" & MyTitle
if MyDetached is "1" then set DCount to DCount + 1
if (MyCalendar is not "Birthdays") and (MyStartDate ≥ item 1 of ThePeriod) and (MyStartDate ≤ item 2 of ThePeriod) then
tell application "iCal"
tell calendar MyCalendar
set ThisItem to make new event at end of events with properties {summary:MyTitle, start date:MyStartDate}
end tell
tell ThisItem
if MyAllDay is "1" then set allday event to true
if (count of MyRecurs) > 0 then set recurrence to MyRecurs
set end date to MyEndDate
end tell
end tell
else
set SCount to SCount + 1
end if
if (LCount mod 50) = 0 then
set the_message to "Processed " & (LCount as string) & " of " & (HowMany as string)
display dialog the_message buttons {"Cancel"} giving up after 1
end if
end repeat
on error TheError
display dialog "Error: " & TheError & " about line " & LCount
end try
set AppleScript's text item delimiters to OldDelim
display dialog (LCount as string) & " lines processed" & return & "All Day: " & (ACount as string) & return & "Recurs: " & (RCount as string) & return & "Detach: " & (DCount as string) & return & "Skipped: " & (SCount as string)
end run
on FixMyDate(MyDate)
date (do shell script "date -r " & MyDate & " -v+31y +%e'/'%m'/'%y' '%T")
end FixMyDate
</pre>

How to get event from message?

Hi,All:
I write a run-time interface by CVI, I use TS_EngineRegisterUIMessageCallback to register my callback function, but when message passed to the callback function, as the type is struct IDispatch but not CAObjHandle, I don't know how to read event from message.
Can you help me to solve it? Thanks
Chang Zhang

Hello Chang-
If your question is simply how to obtain an object handle from an object of type IDispatch, have you investigated the function "CA_CreateObjHandleFromIDispatch"? I would recommend you look over the testexec.prj that is installed along with the TestStand engine (the CVI Operator Interface) and inspect how we handle our callbacks, this may help you understand how to go about emulating the behavior in your own project. To see this particular function in use it may be most helpful to look in the file 'engine.c' and inside the function UIMessageDeferredCallback here you will see the IDispatch pointer being handled and decoded for use by the TS engine.
Regards,
Elaine R.
Applications Engineering
National Instruments
http://www.ni.com/ask

How to disable the "turn page" event triggered by the scroll/swipe function?

The problem is as follows.
The default behaviour of Acrobat Reader (both stand alone and browser plug-in) is to allow scrolling/swiping with the mouse wheel/trackpad. This is useful when the pdf's page length is greater than the screen's own length, because you can read the pdf with no need to distract your attention from the text to the scrollbar button. However, the same scroll/swipe function turns into a usability problem when the pdf is embedded in a html page and the pdf's page length is smaller than the browser's length. In this case, the scroll/swipe turns the page, distracting your attention from the text to the unintended behaviour of the browser. What happens is that you are so used to scrolling/swiping that you did it unintentionally in the pdf's caption area. You really did not want to turn pages in the pdf. Furthermore, if the pdf takes the whole html page, being a website, the scroll/swipe function flips the website pages in ways that neither the reader nor the writer had ever intended. Hence the question. How to disable, in this case, the "turn page" event triggered by the scroll/swipe function? A JavaScript should do, but the SDK documents did not help so far...
Message was edited by: 41457173
Message was edited by: 41457173

... or release a patch for the API,
... or suggest an alternative route to achieve the intended result.

How to determine the source of Events triggered in a process chain

Hi ,
We have almost a 100 process chains, and of these approx 20-30 local process chains are triggered by events raised within other process chains. These events are raised via BP_EVENT_RAISE using the ABAP process type.
However, our problem is to identify the source of these event trigger - i.e. which process chain triggered this event ?
Looking at SM64, the event history does not display the source for these events.
Is there any table or program that we can use to determine the source of these events which are triggered.
Any help is much appreciated and points awarded.
thanks
BK

Hi,
do check in the program /SSA/BWT . or TCODE - ST13 -- enter BW-TOOLS and execute. -- Choose Process chains and execute --- Select the date and time for which you want to see the process chains and execute again.
This will give you the entire list of process chains triggered, status, timings(start, end, overall runtime). Once clicked on the process chains it will show you the steps in theprocess chains, data loaded in the data targets, source system, etc...
hope it helps.

How to realize the other three events triggered by a sequence of events occurs?

How to realize the other three events triggered by a sequence of events that occurs between Labview, and the time interval between three events for the 50ms?
1110340053

Are you another student who feels the need to post their "student ID" number as a part of the message? There is really no need to do that, it is meaningless to us.
You should ask your instructor to answer your questions rather than allowing them to turn the whole class of students loose on the forums usually asking the same identical question.
At least in your case, the question is different from most we've seen. Unfortunately, you haven't asked a clear enough question for us to understand what you are talking about.
What "events" are you talking about? Post a VI that demonstrates the code that you have written so far.

How to Read FPM Events in WDDOBEFOREACTION

Dear All,
I am working on a GAF solution. If the user clicks the PREV or EXIT buttons I want to skip the Check the mandatory field validations. But do not know how to read the FPM Events inside the WDDOBEFOREACTION method inside the View.
Any help is greatly appreciated.
Thank you.
PK

Hi,
Below code can be used to get the current executed FPM event.
DATA io_event type cl_fpm_event.
io_event = wdevent->get_string( 'ID' ).
io_event will have the Event which is being triggered.
FPM event can be captured in WDDOBEFOREACTION, but since this hook method is invoked before any events in the view, so it will throw a dump , if any action is triggered other FPM event.
So it is better to write the validation in Component controller method,(ON_PROCESS ), if we want to Validate based on prev and next buttons.
DATA io_event type cl_fpm_event.
CASE io_event->mv_event_id .
WHEN cl_fpm_event=>'NEXT'. " Global constants can be declared like gc_event_edit,etc
Endcase.
Regards,
Harsha J

Wait events - how to read it

Hi frnds,
As, I'm beginner to performance tuning I dont know
What action do i need to take?
I mean how to read the output which I given below.
this is the output suffering buffer busy waits.
Could anyone please tell me
CLASS TOTAL_WAITS TOTAL_TIME
data block 93303 58711
unused 0 0
system undo header 12 232
undo header 7847 6636
3rd level bmb 0 0
save undo header 0 0
bitmap index block 0 0
file header block 0 0
free list 0 0
undo block 68 207
segment header 422 399
extent map 0 0
2nd level bmb 0 0
system undo block 0 0
sort block 0 0
save undo block 0 0
1st level bmb 1 17
bitmap block 0 0
Thanks, Muhammed Thameem. S

Hello,
"Buffer busy waits" is contention for a buffer (representing a specific
version of a database block) within the Buffer Cache. So, in essence
it is block contention and thus it is most likely something to do with
the design of the tables and indexes supporting the application. A
built-in bottleneck. On indexes, it could be the age-old problem of
insertions into an index on a column with a monotonically-ascending
data value (i.e. timestamps or sequence numbers) which tends to cause
contention on the highest leaf node of the index. On tables, it might
have to do with many concurrent insertions into a table in a
freelist-managed tablespace where the table has only one freelist. It
could also be due to a home-grown implementation of sequence-number
generators (i.e. small table with one row, one column in which contains
the "last value" of a sequence, etc) which lots of people use to avoid
not being "portable across databases" which they think means not using
Oracle sequences (yadda yadda yadda).
I'd look for any SQL statement in the "SQL sorted by Elapsed Time"
section of the AWR report which exhibits high elapsed time but
relatively low CPU time, indicating a lot of wait time. Of course,
there are something like 800 possible wait events in current releases
of Oracle, of which "buffer busy waits" is only one, so this is just
inference and not a direct causal connection to your problem. But,
once I find such statements I'd check to see if they are
accessing/manipulating tables within the CUBS_DATA tablespace, and then
use "select * from table(dbms_xplan.display_awr('sql-id'))" to
get the execution plan(s), and then look for something ineffective
within the execution plan. You might find the script "sqlhistory.sql" helpful
here as well, to get a "historical perspective" on the execution of the
SQL statements over time, in case the buffer busy waits peaked at some
point in the past
Please refer to:
http://www.pubbs.net/201003/oracle/51925-understanding-awr-buffer-waits.html
Also
http://www.remote-dba.net/oracle_10g_tuning/t_buffer_busy_waits.htm
kind regards
Mohamed

How to create event based process chains

Hi All,
I would like to know about event based process chains. In connection to this, could you please answer the following queries,
1. How to create events
2. How to link created event to the process chain in the same BI or BW system and as well as from
    externel BI system.
3. How link one process chain with other process chain (i.e, After completion of one process chain, it
    should trigger other dependent process chain)
Thanks and Regards,
Kotesh.

1). Doubt regarding first question.
For example, i would like to create time based event (it should be trigger daily at specified time),
where we have to maintain scheduling options while creating event.
When i checked SM62 there i found only two options a). Event name and b). Description.
Could please send any doucument link if you have.
Ans : You can use function modules like "BP_EVENT_RAISE" in a program and schedule the program to trigger.
2). For externel BIW system also same procedure we need to follow or any difference.
Ans : Externally you need to trigger the same event.
3). i found dependent process chain also had scheduling options as direct scheduling insted of start using meta chain or API. As you said dependent process chain should be mata chain. it seems dependent process chain may be Meta chain or Direct scheduilg.
Ans : Its your choice how you want to schedule it.You can either make that dependent chain a metachain or schedule it separately.
I found at the end of first process chain they kept one process like Raise event and second process chain connected with the help of raise event process event name. If you have any idea about this process could explain a bit more.
Ans : May be they are raising the event in the main chain and triggering the dependent chain using this event.
But Metachain is preferred for such thing.Though it does similar thing.
Hope this helps.

How to read the comment field of the Leave of absence Workflow.

Hi,
I have attached a custom Workflow template to the
Standard class "CL_HRASR00_WF_PROCESS_OBJECT" and event "TRIGGERED" for my Personal leave of absence approval.
During the Workflow step, once the approval goes to the final approval step and it is there in the Benifit Administrator's inbox (Portal) for approval, the Benift Admin is having an option of Withdrawing the process(Withdraw Process button). After filling the comments field, once he clicks this withdraw button the standard class "CL_HRASR00_WF_PROCESS_OBJECT" event "WITHDRAWN" gets triggered and it calls a separate workflow.
I need to capture this comment in the new Workflow but not able to do the same.
Can anyone let me know how can I do this. The event container does have any parameter to pass this value to the workflow container. And since the Step_Object GUID also changes I am unable to read it in the second workflow.
Looking for some real help as this has become critical for the project.
Thanks is andvace.

Hi All,
Thanks for your reply Trevor, but I guess you misunderstood my question. What I am not looking for is not the absence data. Basically I need to capture the comments put in by the Benifit administrator in the Leave of absence application form (Personal or Maternity/child care ), incase when he goes for withdrawing the Application submitted by the Employee.
To elaborate it functionality step by step...
1. An employee logs on to portal and submits a LOA application with a few mandatory field ( Commencing date,Returning Date, Reason).
This kicks of a Workflow say WF1 attached to
ABAP Class- CL_HRASR00_WF_PROCESS_OBJECT, Event- TRIGGERED.
2. Then after executing a few tasks to retrive data it goes to the Manager for approval. Once the manager appoves it goes to the Benifit Administrator.
3. The Benifit Administrator can approve the application or has an option of withdrawing it.
4. In case the Benifit Administrator goes for Withdrawal, after putting some comments in the form, it triggers the Event-WITHDRAWN of ABAP Class-CL_HRASR00_WF_PROCESS_OBJECT.
5. This event in turn starts a new Workflow WF2.
6. In this Workflow WF2 I need to pull in the comments put in by the Benifit Admin.
How can I pull this comment?

How to read a very BIG XML-File

Hello together,
how can I read a XML file of e.g. 2 GByte in ABAP ( Release 4.6C ). The file should be read from the Application-Server ( not from the Front-End ).
Problem: Too much MEMORY is needed by the upload of the complete file into an internal table. In order to produce a stream, the complete file must be uploaded. The parser works with parse_event ( Event-triggered ) and is not creating a DOM. The parsing itself is no problem.
Possible solution: Feed the stream with parts of the file. But how !?
Here is some coding of the program:
data: l_xml_filename    type localfile,
        l_event_sub       type i,
        l_boolean         type c,
        l_subrc           type i.
Datei mit Größe in XML-Tabelle einlesen:
l_xml_filename = 'I:TEMPGeboIsp-PSGK37.xml'.
perform read_file_in_xml_table using    p_xml_filename
                                 changing g_xml_table
                                          g_xml_size.
XML-Dokument aus Tabelle bilden:     =========================
iXML factory erzeugen:
go_ixml = cl_ixml=>create( ).
stream factory erzeugen:
p_streamfactory = go_ixml->create_stream_factory( ).
XML-Dokument erzeugen:
p_xml_document = go_ixml->create_document( ).
Input-Stream erzeugen:
p_istream = p_streamfactory->create_istream_itable(
                      table = g_xml_table
                      size = g_xml_size ).
p_parser = go_ixml->create_parser( stream_factory = p_streamfactory
                                     istream        = p_istream
                                     document       = p_xml_document ).
l_event_sub = if_ixml_event=>co_event_element_pre +
                if_ixml_event=>co_event_element_post.
call method p_parser->set_event_subscription( l_event_sub ).
l_boolean = p_parser->set_dom_generating( ' ' ).
The program works fine but needs too much memory because of the big internal table.
I would be very happy if somebody could help me!
Thanks in advance!
Thomas
P.s.: German answers are welcome!
Message was edited by:
        Thomas13 Scheuermann
Message was edited by:
        Thomas13 Scheuermann

Hello myself,
nobody has answered my question, so now I answer myself!!
The wrong part is to read the file with "open dataset" and to create the inputstream with
p_istream = p_streamfactory->create_istream_itable(
table = g_xml_table
size = g_xml_size ).
Better ist to create the inputstream with
p_istream = p_streamfactory->create_istream_uri(
.......................PUBLIC_ID = ''
.......................SYSTEM_ID = '
applserver\I$\TEMP\Datei.XML' ).
In this way no space is needed for the file.
Best regards,
Thomas
Message was edited by:
        Thomas13 Scheuermann

How to read multiple dat files.

Hello Everyone!
I am working on a project that requires one file that creates a JFrame with a current file title, JTextFields that accesses two .dat files and a JButton.
The user clicks a JButton to cycle through the first sequential .dat file. When the end of the first file is reached the file is closed, the JFrame title is changed to the second file title as the user continues to click the JButton to continue on viewing the second file?s records, until the second reaches the end of file.
The project requires using Try-Catches to catch the EOF exceptions and IOExceptions and Thread or Runnable.
I have been able to get one file to read and display its records; however, researching back through my text on how to read/write to files I haven?t been able to determine how to get to the end of the file and proceed to the next file without triggering the EOFException. I have even tried multiple Try-Catches (one for each file within the actionPerformed method) and that ends up ignoring the first file records and only displays the second files records.
This is a school project and we have only covered just the bare basics of Java over the last two months. So, any hints that anyone can provide can only be of what type of procedure will be needed or what procedure won?t help to complete the task, without giving away the solution.
I have spent approximately 40 hours of study time on this project and believe that I have definitely run into a major snag.
The following is the code I have so far:
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class StudentRead extends JFrame implements ActionListener
   private JLabel gradStudentList = new JLabel("GRADUATE Student List");
   private JLabel undergradStudentList = new JLabel("UNDERGRADUATE Student List");
   private Font bigFont = new Font("Helvetica", Font.ITALIC, 24);
   private JLabel userprompt = new JLabel("View the students");
   private JTextField idNumText = new JTextField(4);
   private JTextField lastNameText = new JTextField(15);
   private JTextField firstNameText = new JTextField(15);
   private JButton viewRecordButton = new JButton("View Record");
   private JLabel idNumberLabel = new JLabel("ID Number");
   private JLabel lastNameLabel = new JLabel("Last name");
   private JLabel firstNameLabel = new JLabel("First name");
   private Container con = getContentPane();
   DataInputStream gradStudentInStream;
   DataInputStream undergradStudentInStream;
   public StudentRead()
      super("Read Student Records");
      try
         gradStudentInStream = new DataInputStream(new FileInputStream("GradStudents.dat"));
         undergradStudentInStream = new DataInputStream(new FileInputStream("UndergradStudents.dat"));
      catch(IOException e)
         System.err.println("File not opened");
         System.exit(1);
      setSize(325, 200);
      con.setLayout(new FlowLayout());
      gradStudentList.setFont(bigFont);
      con.add(gradStudentList);
      con.add(userprompt);
      con.add(idNumberLabel);
      con.add(idNumText);
      con.add(lastNameLabel);
      con.add(lastNameText);
      con.add(firstNameLabel);
      con.add(firstNameText);
      con.add(viewRecordButton);
      viewRecordButton.addActionListener(this);
      setVisible(true);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   public void actionPerformed(ActionEvent e1)
      String lastName, firstName;
      int IdNum;
      try
         IdNum = gradStudentInStream.readInt();
         lastName = gradStudentInStream.readUTF();
         firstName = gradStudentInStream.readUTF();
         idNumText.setText(String.valueOf(IdNum));
         lastNameText.setText(lastName);
         firstNameText.setText(firstName);
      catch(EOFException e2)
         closeFile();
         System.exit(0);
      catch(IOException e3)
         System.err.println("Error reading file");
         System.out.println("out");
         System.exit(1);
   public void closeFile()
      try
         gradStudentInStream.close();
         System.exit(0);
      catch(IOException e)
         System.err.println("Error closing file");
         System.exit(1);
   public static void main(String[] args)
      StudentRead rsr = new StudentRead();
}

deepak_1your.com wrote:
hi,
If you want to read a file guarding yourself agianst exceptions....
check this article.... the code presented in this article might suit your needs...
[http://1your.com/fusion/infusions/articles/readarticle.php?article_id=17|http://1your.com/fusion/infusions/articles/readarticle.php?article_id=17]
And how does that help with a DataInputStream?

Why and how to use events in abap objects

Dear all,
Please explain me why and how to use events in abap objects with real time example
regards
pankaj giri

Hi Pankaj,
I will try to explain why to use events... How to use is a different topic.. which others have already answered...
This is same from your prev. post...
Events :
Technically speaking :
" Events are notifications an object receives from, or transmits to, other objects or applications. Events allow objects to perform actions whenever a specific occurrence takes place. Microsoft Windows is an event-driven operating system, events can come from other objects, applications, or user input such as mouse clicks or key presses. "
Lets say you have an ALV - An editable one ...
Lats say - Once you press some button you want some kind of validation to be done.
How to do this ?
Raise an Event - Which is handled by a method and write the validation code.
Now you might argue, that I can do it in this way : Capture the function code - and call the validate method.
Yes, in this case it can be done.. But lets say .. you change a field in the ALV and you want the validation to be done as soon as he is done with typing.
Where is the function code here ? No function code... But there is an event here - The data changed event.
So you can raise a data changed event that can be handled and will do the validation.
It is not user friendly that you ask the user to press a button (to get the function code) for validation each time he enters a data.
The events can be raised by a system, or by a program also. So in this case the data changed event is raised by a system that you can handle.
Also, Lets say on a particular action you want some code to trigger. (You can take the same example of validation code). In this case the code to trigger is in a separate class. The object of which is not available here at this moment. (This case happens very frequently).
Advantage with events : Event handlers can be in a separate class also.
e.g : In the middle of some business logic .. you encounter a error. You want to send this information to the UI (to user - in form of a pop up) and then continue with some processing.
In many cases - A direct method call to trigger the pop up is not done. Because (in ideal cases) the engine must not interact with UI directly - Because the UI could be some other application - like a windows UI but the error comes from some SAP program.
So - A event is raised from the engine that is handled in the UI and a pop up is triggered.
Here -- I would have different classes (lets say for different Operating Systems). And all these classes must register to the event ERROR raised in application.
And these different classes for different Operation systems will have different code to raise a pop-up.
Now you can imagine : If you coded a pop-up for Windows (in your application logic) .. it will not work for Mac or Linux. But of you raise a event.. that is handled separately by a different UI classes for Win, Linux or Mac they will catch this event and process accordingly.
May be I complicated this explanation .... but I couldn't think of a simpler and concrete example.
Cheers.
Varun.

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