How can I limit same application only be launched once in one pc

I designed my first game application. It is a multi-play net chess game, I use RMI to achieved it.But I don't want to any player to open two or more client chess application in their PC(they can cheat in playing by this way).how can I do it?
kind java fans, please give me some tips or suggestion. I am also a java fan....
I will show my loyalty to java and sun and J2EE for ever.....

I had the same problem before. What we did, was to establish a port listener thread inside our application. Once the application starts, it checks if that port is already in use. If not, it establishes the listener and goes on. If the port is in use, the second instance has been started, and can safely terminate. What we did in addition to that, the second instance would pass any commandline parameters through the port communication to the already running instance, so that that program could carry out the task the user requested.
If the application crashed or is killed by the user, this will work also because then the port will be freed automatically by the system.
As you are a beginner you are probably not familiar with socket communication. I'd recommend Bruce Eckel's book "Thinking in Java" which has an excellent chapter on socket programming in Java (actually our solution was based upon his examples - thanks for that Bruce!).
You can download the book here:
http://www.mindview.net/Books
Thomas

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The Mac App Store only has apps for Mac OS X. There are no iOS apps.
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See:
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Hi everyone,
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Yoel -
We're talking about end users of applications you develop in Application Express, not users that login to the development environment.
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John Guo wrote:
For your account choose "no access" by clicking on the triangle.
Hi a.
What ì assume John means to say is you have to block access to your "guest accounts". What John describes is what you should use for any folders and files you keep outside the Home folder of your Admin account. There's also a more advanced thingy called Access Control Lists, but I'm not going to discuss that here.
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Hi,
Thanks for your post!
According to your description, I am afraid your problem is out of support in C#language forum. So i move your thread to off-topic forum!
Best Wishes!
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makes it easier for other visitors to find the resolution later.

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Debbie (guest) wrote:
: Chad Nale (guest) wrote:
: : How can I limit the number of rows returned by a select
: : statement. I have a query where I return the number of
: stores
: : that are located in a given area.. I only want to return the
: : first twenty-five stores. In some instances there may be
: over
: : 200 stores in a given location.
: : I know is SQL 7 that I can set the pagesize to be 25....
: : Anything similiar in Oracle 8i?
: If you are in Sql*Plus, you could add the statement
: WHERE rownum <= 25
: Used together with an appropriate ORDER BY you
: could get the first 25 stores.
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can any body reply me.
thanks

Hari,
hi Check out this sample code to use session method
REPORT ztest_report
NO STANDARD PAGE HEADING
                        LINE-SIZE 255
                        MESSAGE-ID ZRASH.
                Internal Table Declarations                          *
*--Internal Table for Data Uploading.
DATA : BEGIN OF IT_FFCUST OCCURS 0,
         KUNNR(10),
         BUKRS(4),
         KTOKD(4),
         ANRED(15),
         NAME1(35),
         SORTL(10),
         STRAS(35),
         ORT01(35),
         PSTLZ(10),
         LAND1(3),
         SPRAS(2),
         AKONT(10),
       END OF IT_FFCUST.
*--Internal Table to Store Error Records.
DATA : BEGIN OF IT_ERRCUST OCCURS 0,
         KUNNR(10),
         EMSG(255),
       END OF IT_ERRCUST.
*--Internal Table to Store Successful Records.
DATA : BEGIN OF IT_SUCCUST OCCURS 0,
         KUNNR(10),
         SMSG(255),
       END OF IT_SUCCUST.
*--Internal Table for Storing the BDC data.
DATA : IT_CUSTBDC LIKE BDCDATA OCCURS 0 WITH HEADER LINE.
*--Internal Table for storing the messages.
DATA : IT_CUSTMSG LIKE BDCMSGCOLL OCCURS 0 WITH HEADER LINE.
DATA : V_FLAG1(1) VALUE ' ',
"Flag used for opening session.
       V_TLINES LIKE SY-TABIX,
       "For storing total records processed.
       V_ELINES LIKE SY-TABIX,
       "For storing the no of error records.
       V_SLINES LIKE SY-TABIX.
       "For storing the no of success records.
         Selection screen                                            *
SELECTION-SCREEN BEGIN OF BLOCK B1.
PARAMETERS : V_FNAME LIKE RLGRAP-FILENAME,
             V_SESNAM LIKE RLGRAP-FILENAME.
SELECTION-SCREEN END OF BLOCK B1.
         Start-of-selection                                          *
START-OF-SELECTION.
*-- Form to upload flatfile data into the internal table.
PERFORM FORM_UPLOADFF.
       TOP-OF-PAGE                                                   *
TOP-OF-PAGE.
WRITE:/ 'Details of the error and success records for the transaction'
ULINE.
SKIP.
         End of Selection                                            *
END-OF-SELECTION.
*-- Form to Generate a BDC from the Uploaded Internal table
PERFORM FORM_BDCGENERATE.
*--To write the totals and the session name.
PERFORM FORM_WRITEOP.
*&      Form form_uploadff
    Form to upload flatfile data into the internal table.
FORM FORM_UPLOADFF .
*--Variable to change the type of the parameter file name.
DATA : LV_FILE TYPE STRING.
LV_FILE = V_FNAME.
*--Function to upload the flat file to the internal table.
CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
      FILENAME                      = LV_FILE
    FILETYPE                      = 'ASC'
      HAS_FIELD_SEPARATOR           = 'X'
    HEADER_LENGTH                 = 0
    READ_BY_LINE                  = 'X'
    DAT_MODE                      = ' '
IMPORTING
    FILELENGTH                    =
    HEADER                        =
    TABLES
      DATA_TAB                      = IT_FFCUST
    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.
*--Deleting the headings from the internal table.
    DELETE IT_FFCUST INDEX 1.
*--Getting the total number of records uploaded.
    DESCRIBE TABLE IT_FFCUST LINES V_TLINES.
ENDIF.
ENDFORM.                    " form_uploadff
*&      Form Form_bdcgenerate
    Form to Generate a BDC from the Uploaded Internal table
FORM FORM_BDCGENERATE .
*--Generating the BDC table for the fields of the internal table.
LOOP AT IT_FFCUST.
    PERFORM POPULATEBDC USING :
                                'X' 'SAPMF02D' '0105',
                                ' ' 'BDC_OKCODE' '/00' ,
                                ' ' 'RF02D-KUNNR' IT_FFCUST-KUNNR,
                                ' ' 'RF02D-BUKRS' IT_FFCUST-BUKRS,
                                ' ' 'RF02D-KTOKD' IT_FFCUST-KTOKD,
                                'X' 'SAPMF02D' '0110' ,
                                ' ' 'BDC_OKCODE' '/00',
                                ' ' 'KNA1-ANRED' IT_FFCUST-ANRED,
                                ' ' 'KNA1-NAME1' IT_FFCUST-NAME1,
                                ' ' 'KNA1-SORTL' IT_FFCUST-SORTL,
                                ' ' 'KNA1-STRAS' IT_FFCUST-STRAS,
                                ' ' 'KNA1-ORT01' IT_FFCUST-ORT01,
                                ' ' 'KNA1-PSTLZ' IT_FFCUST-PSTLZ,
                                ' ' 'KNA1-LAND1' IT_FFCUST-LAND1,
                                ' ' 'KNA1-SPRAS' IT_FFCUST-SPRAS,
                                'X' 'SAPMFO2D' '0120',
                                ' ' 'BDC_OKCODE' '/00',
                                'X' 'SAPMF02D' '0125',
                                ' ' 'BDC_OKCODE' '/00',
                                'X' 'SAPMF02D' '0130',
                                ' ' 'BDC_OKCODE' '=ENTR',
                                'X' 'SAPMF02D' '0340',
                                ' ' 'BDC_OKCODE' '=ENTR',
                                'X' 'SAPMF02D' '0360',
                                ' ' 'BDC_OKCODE' '=ENTR',
                                'X' 'SAPMF02D' '0210',
                                ' ' 'KNB1-AKONT' IT_FFCUST-AKONT,
                                ' ' 'BDC_OKCODE' '/00',
                                'X' 'SAPMF02D' '0215',
                                ' ' 'BDC_OKCODE' '/00',
                                'X' 'SAPMF02D' '0220',
                                ' ' 'BDC_OKCODE' '/00',
                                'X' 'SAPMF02D' '0230',
                                ' ' 'BDC_OKCODE' '=UPDA'.
*--Calling the transaction 'fd01'.
    CALL TRANSACTION 'FD01' USING IT_CUSTBDC MODE 'N' UPDATE 'S'
    MESSAGES INTO IT_CUSTMSG.
    IF SY-SUBRC <> 0.
*--Populating the error records internal table.
      IT_ERRCUST-KUNNR = IT_FFCUST-KUNNR.
      APPEND IT_ERRCUST.
      CLEAR IT_ERRCUST.
*--Opening a session if there is an error record.
      IF V_FLAG1 = ' '.
        PERFORM FORM_OPENSESSION.
        V_FLAG1 = 'X'.
      ENDIF.
*--Inserting the error records into already open session.
      IF V_FLAG1 = 'X'.
        PERFORM FORM_INSERT.
      ENDIF.
*--Populating the Success records internal table.
    ELSE.
      IT_SUCCUST-KUNNR = IT_FFCUST-KUNNR.
      APPEND IT_SUCCUST.
      CLEAR IT_SUCCUST.
    ENDIF.
*--Displaying the messages.
    IF NOT IT_CUSTMSG[] IS INITIAL.
      PERFORM FORM_FORMATMSG.
    ENDIF.
*--Clearing the message and bdc tables.
    CLEAR : IT_CUSTBDC[],IT_CUSTMSG[].
ENDLOOP.
*--Getting the total no of error records.
DESCRIBE TABLE IT_ERRCUST LINES V_ELINES.
*--Getting the total no of successful records.
DESCRIBE TABLE IT_SUCCUST LINES V_SLINES.
*--Closing the session only if it is open.
IF V_FLAG1 = 'X'.
    PERFORM FORM_CLOSESESS.
ENDIF.
ENDFORM.                    " Form_bdcgenerate
*&      Form populatebdc
      FOrm to Populate the BDC table.
FORM POPULATEBDC USING    VALUE(P_0178)
                           VALUE(P_0179)
                           VALUE(P_0180).
IF P_0178 = 'X'.
    IT_CUSTBDC-PROGRAM = P_0179.
    IT_CUSTBDC-DYNPRO = P_0180.
    IT_CUSTBDC-DYNBEGIN = 'X'.
ELSE.
    IT_CUSTBDC-FNAM = P_0179.
    IT_CUSTBDC-FVAL = P_0180.
ENDIF.
APPEND IT_CUSTBDC.
CLEAR IT_CUSTBDC.
ENDFORM.                    " populatebdc
*&      Form FORM_OPENSESSION
      Form to Open a session.
FORM FORM_OPENSESSION .
*--Variable to convert the given session name into reqd type.
DATA : LV_SESNAM(12).
LV_SESNAM = V_SESNAM.
*--Opening a session.
CALL FUNCTION 'BDC_OPEN_GROUP'
   EXPORTING
     CLIENT                    = SY-MANDT
     GROUP                     = LV_SESNAM
     HOLDDATE                  = '20040805'
     KEEP                      = 'X'
     USER                      = SY-UNAME
     PROG                      = SY-CPROG
IMPORTING
   QID                       =
   EXCEPTIONS
     CLIENT_INVALID            = 1
     DESTINATION_INVALID       = 2
     GROUP_INVALID             = 3
     GROUP_IS_LOCKED           = 4
     HOLDDATE_INVALID          = 5
     INTERNAL_ERROR            = 6
     QUEUE_ERROR               = 7
     RUNNING                   = 8
     SYSTEM_LOCK_ERROR         = 9
     USER_INVALID              = 10
     OTHERS                    = 11
IF SY-SUBRC <> 0.
    WRITE :/ 'Session not open'.
ENDIF.
ENDFORM.                    " FORM_OPENSESSION
*&      Form FORM_INSERT
      fORM TO INSERT ERROR RECOED INTO A SESSION.
FORM FORM_INSERT .
*--Inserting the record into session.
CALL FUNCTION 'BDC_INSERT'
    EXPORTING
      TCODE                  = 'FD01'
    POST_LOCAL             = NOVBLOCAL
    PRINTING               = NOPRINT
    SIMUBATCH              = ' '
    CTUPARAMS              = ' '
    TABLES
      DYNPROTAB              = IT_CUSTBDC
    EXCEPTIONS
      INTERNAL_ERROR         = 1
      NOT_OPEN               = 2
      QUEUE_ERROR            = 3
      TCODE_INVALID          = 4
      PRINTING_INVALID       = 5
      POSTING_INVALID        = 6
      OTHERS                 = 7
IF SY-SUBRC <> 0.
    WRITE :/ 'Unable to insert the record'.
ENDIF.
ENDFORM.                    " FORM_INSERT
*&      Form FORM_CLOSESESS
      Form to Close the Open Session.
FORM FORM_CLOSESESS .
CALL FUNCTION 'BDC_CLOSE_GROUP'
    EXCEPTIONS
      NOT_OPEN    = 1
      QUEUE_ERROR = 2
      OTHERS      = 3.
IF SY-SUBRC <> 0.
ENDIF.
ENDFORM.                    " FORM_CLOSESESS
*&      Form FORM_FORMATMSG
      Form to format messages.
FORM FORM_FORMATMSG .
*--Var to store the formatted msg.
DATA : LV_MSG(255).
CALL FUNCTION 'FORMAT_MESSAGE'
    EXPORTING
      ID        = SY-MSGID
      LANG      = SY-LANGU
      NO        = SY-MSGNO
      V1        = SY-MSGV1
      V2        = SY-MSGV2
      V3        = SY-MSGV3
      V4        = SY-MSGV4
    IMPORTING
      MSG       = LV_MSG
    EXCEPTIONS
      NOT_FOUND = 1
      OTHERS    = 2.
IF SY-SUBRC = 0.
    WRITE :/ LV_MSG.
ENDIF.
ULINE.
ENDFORM.                    " FORM_FORMATMSG
*&      Form form_writeop
      To write the totals and the session name.
FORM FORM_WRITEOP .
WRITE :/ 'Total Records Uploaded :',V_TLINES,
           / 'No of Error Records :',V_ELINES,
           / 'No of Success Records :',V_SLINES,
           / 'Name of the Session :',V_SESNAM.
ULINE.
ENDFORM.                    " form_writeop
Don't forget to reward if useful..

How can change language of application dynamic?

In the dialog I have combo box in which I can select desire language for application. When I select value I save this value in the config file. But language change ONLY when I exit and again enter to the application. How can change language of application dynamic (without exit from application) ?

alexpass wrote:
In the dialog I have combo box in which I can select desire language for application. When I select value I save this value in the config file. But language change ONLY when I exit and again enter to the application. How can change language of application dynamic (without exit from application) ?I guess your application sets the locale at "startup", based on the contents of the config file, using a call to java.util .Locale.setDefault(Locale). Did you try to call this method in response to the selection in the combobox?
This won't refresh all widgets already created however. You probably have to re-create them all.
There may be case-by-case way to refresh them, for example Locale-dependent layout may be taken into account dynamically. Try and tell us.

How can I limit same application only be launched once in one pc

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