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virtual void OnStop() override { this->timer->Stop(); eventLog1->WriteEntry("SimpleWinService Stopped"); } virtual void OnPause() override { this->timer->Stop(); eventLog1->WriteEntry("SimpleWinService Paused"); } virtual void OnContinue() override { eventLog1->WriteEntry("SimpleWinService Continued"); this->timer->Start(); } private: System::Diagnostics::EventLog^ System::Timers::Timer^ timer;

eventLog1;

#import "FreehandTool.h" - (IBAction)touchFreehandItem:(id)sender { self.currentTool = [FreehandTool sharedFreehandTool]; [freehandButton setImage:[UIImage imageNamed:@"button_bezier_selected.png"]]; }

Now you re ready to test the web service. 1. Press Ctrl+F5 and start the application without debugging. The directory listing will display for MyWebService. 2. Click MyService.asmx to open the web service .asmx page, as shown in Figure 8-21.

components;

#pragma region Windows Form Designer generated code void InitializeComponent(void) { this->components = (gcnew System::ComponentModel::Container()); this->eventLog1 = (gcnew System::Diagnostics::EventLog()); (cli::safe_cast<System::ComponentModel::ISupportInitialize^> (this->eventLog1))->BeginInit(); // // eventLog1 // this->eventLog1->Log = L"Application"; this->eventLog1->Source = L"SimpleWinService"; // // SimpleWinService // this->CanPauseAndContinue = true; this->ServiceName = L"SimpleWinService"; (cli::safe_cast<System::ComponentModel::ISupportInitialize^> (this->eventLog1))->EndInit(); } #pragma endregion private: void timer_Tick(System::Object^ sender, System::Timers::ElapsedEventArgs^ e) {

Figure 8-21. The MyService web service page 3. Click GetLocalWeather to bring up the test parameter page. You can enter any valid integer here for the zip code parameter, since our sample ignores the zip code. Click Invoke, and the dismal yet accurate local weather forecast will be returned, as shown in Figure 8-22.

this->timer->Stop(); eventLog1->WriteEntry("SimpleWinService Elapsed Event Occurred"); this->timer->Start(); } }; }

That s it! The final drawing tool button in our toolbar is complete. Try it out and see how it works. Figure 4 7 shows a bit of art created with our Dudel tools.

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With other application types, you would now be ready to compile and run. Not so with Windows services. You now need to add one ServiceProcessInstaller class and a ServiceInstaller class for each service that makes up the Windows service. These classes then are used by the service configuration application to register the Windows service correctly within the registry. To perform the actual registering process, you normally use the service configuration application provided by .NET called InstallUtil.exe. (You can use other installation programs or even write your own, but doing this is beyond the scope of this book.) Fortunately, the process for creating the ServiceProcessInstaller and ServiceInstaller class is mostly automated. Here are the steps you will follow: 1. Switch to the Design view of the service. You can double-click SimpleWinService.h to do this. 2. Right-click anywhere on the Design view window to bring up the menu shown in Figure 15-5.

For a more realistic example, we will hook up the database portion to return the city name when you pass in the zip code. 1. Create a table in your MyDatabase database named CityZip. The CREATE TABLE statement is shown in Listing 8-4. Listing 8-4. CityZip CREATE TABLE Statement USE [MyDatabase] GO /****** Object: Table [dbo].[CityZip] ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[CityZip]( [zipcode] [int] NULL, [city] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ) ON [PRIMARY] 2. With this simple two-column table, you need to insert only one row to get things started. You can add any others for your local town. Insert into CityZip (zipcode, city) Values (98024, 'Seattle') 3. Replace the throw new System.NotImplementedException() template code for the GetCityName service with the code for accessing the database from the web service, as shown in Listing 8-5. Listing 8-5. Get City Database Lookup { SqlConnection cn = new SqlConnection( ConfigurationManager.ConnectionStrings["MyDatabase"].ToString()); SqlCommand cmd = new SqlCommand("SELECT city FROM cityzip " + "WHERE zipcode = @zipcode", cn); SqlDataReader dr; string mystring = ""; cmd.CommandType = CommandType.Text; cmd.Parameters.AddWithValue("@zipcode", ZipCode); cn.Open(); dr = cmd.ExecuteReader(CommandBehavior.CloseConnection); while (dr.Read()) { mystring = dr["city"].ToString(); } return mystring; }

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