Reading data from socket into buffer

Hi all,
I'm reading packets of data from a socket, and i want to store it into a buffer array.
I don't know the packet length, which means i can't really specify the buffer length.
Is there anyway to get around this?
Thanks,
Hugh

Have a look at BufferedOutputStreamHTH.
Yu SONG

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Error when reading data from socket

Hi,
I am getting the error 'NiRawReadError: An error occured when reading data from socket.' when using the ABAP API 'mo_core_service->invoke_matching'.
And I get this error only when I pass ABAP_TRUE to the paramter 'iv_wait_for_invocation' .
Can anybody help me in correcting this?

Hi Narasa,
The following error is already in discussion in the below forum.Plz consult the forum link you will find the error solution.
Problem in ABAP API - NiRawReadError: error when reading data from socket
Rgds
Ankit

How to detect a -1 in while reading data from socket

Hi
Am faced with a problem in socket reading
Whenever I try to read any data from a socket and I encounter a -1, I assume that the steam has reached End of File and close that connection. This logic was introduced overcome a problem of connection getting closed from the server and the client connection hanging in CLOSE_WAIT state.
Now the problem if the server sends a -1 as part of the data, how do I differenciate between -1 to indicate the End of stream and -1 in the actual data
thanks in advance
jcool

As dannyyates states, the possible return values for read() are a single byte (0..255) or an end of stream (-1), so you have 257 total possible values there. If the other side wrote a byte equal to -1 from its perspective, you would receive a 255 in Java (since both are represented 11111111 in binary - one is interpreted as signed and one is interpreted as unsigned). Your return value from read is between 0x00000000 and 0x000000FF (hex) since read() returns an int (32 bits) rather than a byte (8 bits) and EOF is returned as 0xFFFFFFFF.
Honestly, though, you might just consider using the read(byte[]) method where appropriate. It is much more efficient for reads of more than one byte at a time; it reads a bunch of bytes into an array. Its return value is how many bytes it read, with -1 indicating EOF.

Reading data from socket problem

Hello;
I have implemented a multiplayer game with server java and client flash. I have a socket connection and I get(wait) an encripted data from server. However sometimes I can't get data from server. I know that server is sending the data but I can't see the data on the socket.
Sometimes I cannot get the data in one chunk but I have solved that problem(I hope).. Here is my code:
private function onSocketData(event:ProgressEvent = null) {
     try {
          var input:String = "";
           var byteArray = new ByteArray();
          socket.readBytes(byteArray, 0, socket.bytesAvailable);
           input+= byteArray.toString();
          queueOrg.addToMsgQueue(input);
     } catch (error:Error) {
          trace("SocketConnector -> onSocketData : "+error);
Thanks...

And don't use ready() or available as a test for end of stream like that. That's not what it's for. (What is is for is a moot question.) Using it like that is a recipe for losing data.

NIO Socket implementation - delay between select and get data from socket

Hi all,
I have implemented a internal CallAPI for RPC over a socket connection. It works fine but if there are more than five clients and some load I have the phenomena that the READ selector returns a SelectorKey but I did not get any data from the socket.
My implementation is based on NIO has following components:
+ Accept-Thread
Thread handles new clients.
+ Read-Thread
Thread handles the data from the socket for the registered client. Each request is handled in an own Process-Thread. A Thread-Pool implementation is used for processing.
+ Process-Thread
The Process-Thread reads the data from the socket and starts the processing of the logical request.
In my tests I get the notification of data at the socket. The Process-Thread want to read the data for the socket, but no data are available. In some situations if have to read about 20 times and more to get the data. Between each read attempt I have inserted a sleep in the Process-Thread if no data was available. This have improved the problem, but it already exists. I tested the problem with several systems and jvm's but it seams that it is independent from the system.
What can I to do improve the situation?
I already include the read implementation from the grizzly-Framework. But it doesn't improve the situation.
Socket - Init
     protected void openSocket( String host, int port ) throws IOException
          serverChannel = ServerSocketChannel.open();
          serverChannel.configureBlocking( false );
          serverSocket = serverChannel.socket();
          serverSocket.setReuseAddress( true );
          this.serverhost = host;
          this.serverport = port;
          this.srvAcceptSelector = Selector.open();
          this.srvReadSelector = Selector.open();
          InetSocketAddress isa = null;
          if ( serverhost != null )
               isa = new InetSocketAddress( this.serverhost, this.serverport );
          else
               isa = new InetSocketAddress( this.serverport );
          serverSocket.bind( isa, 50 );
          serverChannel.register( this.srvAcceptSelector, SelectionKey.OP_ACCEPT );
     }New Client � Init
     // New Client
     if ( key.isAcceptable())
          keyCountConnect++;
          ServerSocketChannel actChannel =
               (ServerSocketChannel) key.channel();
          // Socket akteptieren
          SocketChannel actSocket = actChannel.accept();
          if ( actSocket != null )
               actSocket.finishConnect();
               actSocket.configureBlocking( false );
               actSocket.socket().setTcpNoDelay( true );
               this.registerSocketList.add( actSocket );
               this.srvReadSelector.wakeup();
     }Read Data from Socket
    protected int readDatafromSocket( ByteArrayOutputStream socketdata )
         throws IOException
         int readedChars = 0;
        int count = -1;
        Selector readSelector = null;
        SelectionKey tmpKey = null;
        if ( sc.isOpen())
              ByteBuffer inputbuffer = null;
             try
                  inputbuffer = bufferpool.getBuffer();
                  while (( count = sc.read( inputbuffer )) > 0 )
                       readedChars += count;
                      inputbuffer.flip();
                       byte[] tmparray=new byte[inputbuffer.remaining()];
                       inputbuffer.get( tmparray );
                       socketdata.write( tmparray );
                      inputbuffer.clear();
                  if ( count < 0 )
                       this.closeSocket();
                       if( readedChars == 0 )
                            readedChars = -1;
                       if ( log.isDebug())
                              log.debug( "Socket is closed! " );
                  else if ( readedChars == 0 )
                       if ( log.isDebug())
                              log.debug( "Reread with TmpSelector" );
                       // Glassfish/Grizzly-Implementation
                     readSelector = SelectorFactory.getSelector();
                     if ( readSelector == null )
                          return 0;
                      count = 1;
                      tmpKey = this.sc.register( readSelector, SelectionKey.OP_READ );
                     tmpKey.interestOps(
                          tmpKey.interestOps() | SelectionKey.OP_READ );
                     int code = readSelector.select( 500 );
                     tmpKey.interestOps(
                         tmpKey.interestOps() & ( ~SelectionKey.OP_READ ));
                     if ( code == 0 )
                         return 0;
                         // Return on the main Selector and try again.
                       while (( count = sc.read( inputbuffer )) > 0 )
                            readedChars += count;
                           inputbuffer.flip();
                            byte[] tmparray=new byte[inputbuffer.remaining()];
                            inputbuffer.get( tmparray );
                            socketdata.write( tmparray );
                           inputbuffer.clear();
                       if ( count < 0 )
                            this.closeSocket();
                            if( readedChars == 0 )
                                 readedChars =-1;
                       else if ( count == 0 )
                              // No data
             finally
                  if ( inputbuffer != null )
                       bufferpool.releaseBuffer( inputbuffer );
                       inputbuffer = null;
                  // Glassfish-Implementierung
                if ( tmpKey != null )
                    tmpKey.cancel();
                if ( readSelector != null)
                    // Bug 6403933
                     try
                        readSelector.selectNow();
                     catch (IOException ex)
                    SelectorFactory.returnSelector( readSelector );
        return readedChars;
    }Thanks for your time.

I've commented on that blog before. It is rubbish:
- what does 'overloading the main Selector' actually mean? if anything?
- 'Although this not clearly stated inside the NIO API documentation': The API documentation doesn't say anything about which Selector you should register channels with. Why would it? Register it with any Selector you like ...
- 'the cost of maintaining multiple Selectors can reduce scalability instead of improving it' Exactly. So what is the point again?
- 'wrapping a ByteBuffer inside a ByteBufferInputStream:' Code is rubbish and redundant. java.nio.channels.Channels has methods for this.
There is no a priori advantage to using multiple Selectors and threads unless you have multiple CPUs. And even then not much, as non-blocking reads and writes don't consume significant amounts of CPU. It's the processing of the data once you've got it that takes the CPU, and that should be done in a separate thread.
So I would re-evaluate your strategy. I suspect you're getting the channel registered with more than one Selector at a time. Implement it the simple way first then see if you really have a problem with 'overloading the main Selector' ...

MDEX intermittantly not returning response, getting com.endeca.navigation.ENEConnectionException: Error reading from socket connection buffer.Connection reset

Intermittant issue where certain portlets have the spinning wheel and error getting thrown in the log, and resulting in stuck threads, has anyone seen this?
Caused by: com.endeca.navigation.ENEConnectionException: Error reading from socket connection buffer.Connection reset
        at com.endeca.navigation.OptiInputBuffer.read(Unknown Source)
        at com.endeca.navigation.OptiInputBuffer.readFully(Unknown Source)
        at com.endeca.navigation.OptiInputBuffer.readUInt(Unknown Source)
        at com.endeca.navigation.OptiInputBuffer.readLine(Unknown Source)
        at com.endeca.navigation.OptiBinaryInterp.FormatCat(Unknown Source)
        at com.endeca.navigation.OptiBinaryInterp.FormatCatsWithAncs(Unknown Source)
        at com.endeca.navigation.OptiBinaryInterp.FormatCatGroup(Unknown Source)
        at com.endeca.navigation.OptiBinaryInterp.FormatBin(Unknown Source)
        at com.endeca.navigation.OptiBinaryInterp.FormatBinList(Unknown Source)
        at com.endeca.navigation.OptiBinaryInterp.ParseBinaryNode(Unknown Source)
        at com.endeca.navigation.OptiBackend.getNavigation(Unknown Source)
        at com.endeca.navigation.HttpENEConnection.query(Unknown Source)
        at com.endeca.portal.mdex.MDEXUtil.execute(MDEXUtil.java:433)
        at com.endeca.portal.data.DataSource.execute(DataSource.java:546)

Message appears in logs internmittantly during page rendering which has Breadcrumbs, Results Table, Guided Navigation portlets. There are Agraphs in front of several Dgraphs.

Possible to read data from a web browser into java?

Is it possible to read data from a web browser such as IE or Mozilla into a java applet for use and manipulation? If it is, could someone please post some documentation I could look at or a snip-it of code I could use? Thanks.

This will read the content from a site:
import java.net.*;
import java.io.*;
class Test {
     public static void main(String[] argv) throws Exception {
          URL u = new URL("http://www.google.com");
          URLConnection uc = u.openConnection();
          BufferedReader br = new BufferedReader(new InputStreamReader(uc.getInputStream()));
          String text;
          while( (text = br.readLine()) != null ) {
               System.out.println(text);
}

How to read data from an internal table into a real table?

Hello experts,
I'm relatively new to ABAP and I'm trying to figure out how to read data from an internal table into a table that I created. I'm trying to use the RRW3_GET_QUERY_VIEW_DATA function module to read data from a multiprovider. I'm trying to read data from the e_cell_data and e_axis_data tables into a table that I've already created. Please see code below.
TABLES MULTITAB.
DATA:
query_name TYPE RSZCOMPID,
s_cubename TYPE RSINFOPROV,
t_cell_data TYPE RRWS_T_CELL,
t_axis_data TYPE RRWS_THX_AXIS_DATA,
t_axis_info TYPE RRWS_THX_AXIS_INFO,
wa_t_cell_data like line of t_cell_data,
wa_t_axis_data like line of t_axis_data,
w_corp_tab like line of t_cell_data.
s_cubename = 'CORP_MPO1'.
query_name = 'Z_corp_test'.
    CALL FUNCTION 'RRW3_GET_QUERY_VIEW_DATA'
       EXPORTING
         i_infoprovider           = s_cubename
         i_query                  = query_name
        i_t_parameter            = query_string_tab
       IMPORTING
         e_cell_data              = t_cell_data
         e_axis_data              = t_axis_data
         e_axis_info              = t_axis_info.
If anyone has any information to help me, I would greatly appreciate it. Thanks.

Hi,
<li>Once you call the function module RRW3_GET_QUERY_VIEW_DATA, lets say data is available in the corresponding tables e_cell_data e_axis_data which you have mentioned.
<li>Modify your internal table defined for other purpose, with data from e_cell_data e_axis_data like below.
LOOP AT t_cell_data INTO wa_t_cell_data.
"Get the required data from t_cell_data.
MOVE-CORRESPONDING wa_t_cell_data TO it_ur_tab.
"Modify your internal table wih data
MODIFY it_ur_tab TRANSPORTING <field1> <field2> <field3>.
ENDLOOP.
LOOP AT t_axis_data INTO wa_t_axis_data.
"Get the required data from t_cell_data.
MOVE-CORRESPONDING wa_t_axis_data TO it_ur_tab.
"Modify your internal table wih data
MODIFY it_ur_tab TRANSPORTING <field1> <field2> <field3>.
ENDLOOP.
Thanks
Venkat.O

Read data from E$ table and insert into staging table

Hi all,
I am a new to ODI. I want your help in understanding how to read data from an "E$" table and insert into a staging table.
Scenario:
Two columns in a flat file, employee id and employee name, needs to be loaded into a datastore EMP+. A check constraint is added to allow data with employee names in upper case only to be loaded into the datastore. Check control is set to flow and static. Right click on the datastore, select control and then check. The rows that have violated the check constraint are kept in E$_EMP+ table.
Problem:
Issue is that I want to read the data from the E$_EMP+ table and transform the employee name into uppercase and move the corrected data from E$_EMP+ into EMP+. Please advise me on how to automatically handle "soft" exceptions in ODI.
Thank you

Hi Himanshu,
I have tried the approach you suggested already. That works. However, the scenario I described was very basic. Based on the error logged into the E$_EMP table, I will have to design the interface to apply more business logic before the data is actually merged into the target table.
Before the business logic is applied, I need to read each row from the E$EMP table first and I do not know how to read from E$EMP table.

Reading data From XML file and setting into ViewObject to Pouplate ADF UI

Hi,
I have following requirement.
I would like to read data from XML file and populate the data in ViewObject so that the data can be displayed in the ADF UI.
Also when user modifies the data in the ADF UI, it should be modified back into to ViewObject.
Here is an example - XML file contains Book Title and Author. I would like to read Book Title and Author from XML file and set it into ViewObject Attribute and then display Book title and Author in ADF UI page. Also when user modifies Book title and Author, I would like to store it back in View Object.
Please help me with this requirement and let me know if any solution exist in ADF, for populating the ADF UI screen fields with external XML file data.
Thanks

Read chapter 42 http://download.oracle.com/docs/cd/E16162_01/web.1112/e16182/bcadvvo.htm of the fusion developer guide
Section 42.7, "Reading and Writing XML"
Section 42.8, "Using Programmatic View Objects for Alternative Data Sources"
Timo

I am writing datas into a FIFO ,i am reading datas from fifo .but when i am writing datas like a a(0),a(1),a(2 like that.when i am reading dating datas a(0)comes to a(3 ) rd place .what is the reason ?

I am writing datas into a FIFO in FPGA Target side ,i am reading datas from fifo in windows host side .but when i am writing datas like a a(0),a(1),a(2 like that.when i am reading dating datas a(0)comes to a(3 ) rd place, a(1) comes to a a(0) .what is the reason ?

Please use a shorter title in your subject line and not post the entire question in therre. (See the subject line I created.) There is also no such word as "datas". Data is already plural.
Please read http://stackoverflow.com/help/how-to-ask. Your question is hard to read because you aren't using proper punctuation and capitalization of your sentences. It looks like one run-on sentence.
Beyond that, it is impossible to help you solve our problem with just your question. Please provide some more information. Perhaps even attach code we can look at. Show us what the data you are sending is supposed to look like, and what it actually looks like.

To read data from exel file into sap

hi all,
How to read data from exel file into the internal table in abap?
Regards,
sugeet.

Hi Sugeet,
Use the following code.
DATA : BEGIN OF tbl_asset occurs 0,
         anlkl LIKE anla-anlkl,          " Asset Class
         bukrs LIKE anla-bukrs,          " Company Code
         ranl1 LIKE ra02s-ranl1,         " Asset #
         txt50 LIKE anla-txt50,          " Description 1
         txa50 LIKE anla-txa50,          " Description 2
         sernr LIKE anla-sernr,          " Serial #
         invnr LIKE anla-invnr,          " Inventory #
         menge LIKE anla-menge,          " Quantity
         meins LIKE anla-meins,          " Base UOM
         inken LIKE anla-inken,          " Inventory
END OF tbl_asset.
DATA : w_filename TYPE IBIPPARMS-path,
       w_file     TYPE string.
start-of-selection.
*popup for file path from user
CALL FUNCTION 'F4_FILENAME'
EXPORTING
   PROGRAM_NAME        = SYST-CPROG
   DYNPRO_NUMBER       = SYST-DYNNR
IMPORTING
   FILE_NAME           = w_filename          .
MOVE w_filename TO w_file .
* upload data
CALL FUNCTION 'GUI_UPLOAD'
EXPORTING
    FILENAME                      = w_file
    FILETYPE                      = 'ASC'
    HAS_FIELD_SEPARATOR           = 'X'
TABLES
    DATA_TAB                      = tbl_asset
EXCEPTIONS
   FILE_OPEN_ERROR               = 1
   FILE_READ_ERROR               = 2
   NO_BATCH                      = 3
   GUI_REFUSE_FILETRANSFER       = 4
   INVALID_TYPE                  = 5
   NO_AUTHORITY                  = 6
   UNKNOWN_ERROR                 = 7
   BAD_DATA_FORMAT               = 8
   HEADER_NOT_ALLOWED            = 9
   SEPARATOR_NOT_ALLOWED         = 10
   HEADER_TOO_LONG               = 11
   UNKNOWN_DP_ERROR              = 12
   ACCESS_DENIED                 = 13
   DP_OUT_OF_MEMORY              = 14
   DISK_FULL                     = 15
   DP_TIMEOUT                    = 16
   OTHERS                        = 17
IF SY-SUBRC <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
for HAS_FIELD_SEPARATOR Use
'X': Fields are separated by tabs.
SPACE: Fields are not separated by tabs. In this case, the table must contain only one column or all columns must be contained in the file in their entire length.
Hope it helps...
Lokesh
Pls. reward appropriate points

Read data from Excel and write into oracle database

Hi
I want to know how can i read data from excel and write into oracle database using java.Kindly help me out to find a solution.
Thanks and Regards
Neeta

Hai,
I am suggesting the solution.
I will try out and let u know soon.
Make a coma separated file from your excel file.
Assuming that your requirement allows to make a csv file.
This file may be passed as an file object to be read by java.Using JDBC you must be able to populate the data base.You can also use String Tokenizer if needed.
You do not want to go via sql Loader?
For reading the excel file itself do you want java?

Reading Data from Unix file and write into an Internal table

Dear all,
                 I am having an requirement of reading data from unix file and write the same into an internal table..how to do that ...experts please help me in this regard.

Hi,
do like this
PARAMETERS: p_unix LIKE rlgrap-filename OBLIGATORY.
DATA: v_buffer(2047) TYPE c.
DATA: BEGIN OF i_buffer OCCURS 0,
        line(2047) TYPE c,
END OF i_buffer.
* Open the unix file..
OPEN DATASET p_unix FOR INPUT IN TEXT MODE.
<b>IF sy-subrc NE 0.
*** Error Message "Unable to open file.
ELSE.</b>
   DO.
     CLEAR: v_buffer.
     READ DATASET p_unix INTO v_buffer.
     IF sy-subrc NE 0.
        EXIT.
     ENDIF.
     MOVE v_buffer TO i_buffer.
     APPEND i_buffer.
ENDDO.
ENDIF.
CLOSE DATASET p_unix.
<b>Reward points if it helps,</b>
Satish

Reading data from an infocube into wd application

Hi,
How can we read data from an infocube.I have to read data from two infocubes and then display it in table in an wd application.
I have found an FM RSDRI_INFOPROV_READ to read , but how to use the same in wd application.

Hi Sanjeev,
Use CALL FUNCTION To use FM in WD.
something like this..
Declarations for BAPI_HU_DELETE_FROM_DEL
DATA : Del     TYPE BAPIDELICIOUSDELIVERY-DELIVERY_NUMBER,
         Return1 TYPE TABLE OF BAPIRET2.
del = lv_imp_outdel.
DATA : HUKEY    TYPE BAPIHUKEY-HU_EXID,
         wa_hukey TYPE BAPIHUKEY-HU_EXID.
loop at lt_pack_mat into ls_pack_mat.
wa_hukey = ls_pack_mat-HANDLING_UNIT.
MOVE wa_hukey TO hukey.
endloop.
Calling BAPI_HU_DELETE_FROM_DEL
CALL FUNCTION 'BAPI_HU_DELETE_FROM_DEL'
    EXPORTING
      DELIVERY = del
      HUKEY    = HUKEY
    TABLES
      RETURN   = Return1.
Commit Work
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT' .
Chers,
Kris.

Reading data from socket into buffer

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