IO2GTableListener.onChanged

To get notifications about row changes in a specific table, an instance of the class implementing the IO2GTableListener interface must be subscribed to the Update operation of this table. It is accompished by calling the IO2GTable.subscribeUpdate method with the O2GTableUpdateType.Update parameter. For example, if you want to get notifications about the updates of the Trades table, write the following line:

Process a notification about updates of the Trades table [hide]

    // Create session which uses table manager
    mSession = CO2GTransport::createSession();
    mSession->useTableManager(Yes, NULL);
 
    //...
    // After the login, get instances of the table manager and Trades table
    IO2GTableManager *tableManager = mSession->getTableManager();
    IO2GTradesTable *tradesTable = (IO2GTradesTable)tableManager->getTable(Trades);
 
    // ...
    // Subscribe listener, listen to inserts into the Trades table, unsubscribe listener
    TableListener *tableListener = new TableListener();
    tradesTable->subscribeUpdate(Update, tableListener);
    uni::Sleep(1000);
    offersTable->unsubscribeUpdate(Update, tableListener);
 
    // Implementation of IO2GTableListener interface public method onChanged
    void TableListener::onChanged(const char *rowID, IO2GRow *rowData)
~    {
        IO2GTradeTableRow *trade = (IO2GTradeTableRow *)(rowData);
        std::cout << "Trade information changed " << rowID << std::endl;
        std::cout << "TradeID: " << trade.getTradeID() <<
                     " Close = " << trade.getClose() << std::endl;
    }

Parameters
`rowID`	The identifier of the row. The parameter has the value of the row identifier for a specific trading table. For example, for the Accounts table, it has the value of the AccountID field. The complete list of the identifiers is shown below.
`rowData`	The object representing a row of a table. In order to process the parameter, you need to know what table it belongs to. It could be accomplished by calling the `IO2GRow`.`getTableType` method. After that, you must cast the parameter to an appropriate class. For example, for a row of the Accounts table, use the `IO2GAccountTableRow` class. The complete list of the classes is shown below. In case the update has been received from the server, the parameter contains a new instance of the object. In case the cause of the update is calculated fields, the instance of the object is equal to the previous call of this method, but calculated fields contain new values. One can use `IO2GRow.isCellChanged` to find out if fields have been changed.

Table name	`rowID`	Cast `rowData` to	Casting syntax
Accounts	AccountID	`IO2GAccountTableRow`	`IO2GAccountTableRow row = (IO2GAccountTableRow )(rowData);`
Offers	OfferID	`IO2GOfferTableRow`	`IO2GOfferTableRow row = (IO2GOfferTableRow )(rowData);`
Trades	TradeID	`IO2GTradeTableRow`	`IO2GTradeTableRow row = (IO2GTradeTableRow )(rowData);`
ClosedTrades	TradeID	`IO2GClosedTradeTableRow`	`IO2GClosedTradeTableRow row = (IO2GClosedTradeTableRow )(rowData);`
Orders	OrderID	`IO2GOrderTableRow`	`IO2GOrderTableRow row = (IO2GOrderTableRow )(rowData);`
Messages	MsgID	`IO2GMessageTableRow`	`IO2GMessageTableRow row = (IO2GMessageTableRow )(rowData);`
Summary	OfferID	`IO2GSummaryTableRow`	`IO2GSummaryTableRow row = (IO2GSummaryTableRow )(rowData);`