//------------------------------------------------------------------- // ECLCommNotify class // // This sample demonstrates the use of: // // ECLCommNotify::NotifyEvent // ECLCommNotify::NotifyError // ECLCommNotify::NotifyStop // ECLConnection::RegisterCommEvent // ECLConnection::UnregisterCommEvent //------------------------------------------------------------------- //................................................................... // Define a class derived from ECLCommNotify //................................................................... class MyCommNotify: public ECLCommNotify { public: // Define my own constructor to store instance data MyCommNotify(HANDLE DataHandle); // We have to implement this function void NotifyEvent(ECLConnection *ConnObj, BOOL Connected); // We choose to implement this function void NotifyStop (ECLConnection *ConnObj, int Reason); // We will take the default behaviour for this so we // don't implement it in our class: // void NotifyError (ECLConnection *ConnObj, ECLErr ErrObject); private: // We will store our application data handle here HANDLE MyDataH; };
//................................................................... void MyCommNotify::NotifyEvent(ECLConnection *ConnObj, BOOL Connected) // // This function is called whenever the communications link // with the host connects or disconnects. // // For this example, we will just write a message. Note that we // have access the the MyDataH handle which could have application // instance data if we needed it here. // // The ConnObj pointer is to the ECLConnection object upon which // this event was registered. //................................................................... { if (Connected) printf("Connection %c is now connected.\n", ConnObj->GetName()); else printf("Connection %c is now disconnected.\n", ConnObj->GetName()); return; } //................................................................... MyCommNotify::MyCommNotify(HANDLE DataHandle) // Constructor //................................................................... { MyDataH = DataHandle; // Save data handle for later use } //................................................................... void MyCommNotify::NotifyStop(ECLConnection *ConnObj, int Reason) //................................................................... { // When notification ends, display message printf("Comm link monitoring for %c stopped.\n", ConnObj->GetName()); } //................................................................... // Create the class and start notification on connection 'A'. //................................................................... void Sample30() { ECLConnection *Conn; // Ptr to connection object MyCommNotify *Event; // Ptr to my event handling object HANDLE InstData; // Handle to application data block (for example) try { Conn = new ECLConnection('A'); // Create connection obj Event = new MyCommNotify(InstData); // Create event handler Conn->RegisterCommEvent(Event); // Register for comm events // At this point, any comm link event will cause the // MyCommEvent::NotifyEvent() function to execute. For // this sample, we put this thread to sleep during this // time. printf("Monitoring comm link on 'A' for 60 seconds...\n"); Sleep(60000);
// Now stop event generation. This will cause the NotifyStop // member to be called. Conn->UnregisterCommEvent(Event); delete Event; // Don't delete until after unregister! delete Conn; } catch (ECLErr Err) { printf("ECL Error: %s\n", Err.GetMsgText()); } } // end sample