winforms code 128

winforms code 128

winforms code 128

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while(true) { Console::WriteLine("Waiting for client connection."); TcpClient^ client = socket->AcceptTcpClient(); Thread ^thr = gcnew Thread( gcnew ParameterizedThreadStart(server, &TcpServer::ProcessThread)); thr->Start(client); } } As you can see from the code, all sending and receiving of data is of type String. What s more interesting is that I am able to use standard WriteLine() and ReadLine() methods to handle communication over the Internet! The following two lines make this possible: StreamWriter^ writer = gcnew StreamWriter(client->GetStream()); StreamReader^ reader = gcnew StreamReader(client->GetStream()); These lines create a StreamWriter and StreamReader object (which I covered in 8) from the NetworkStream object returned by the TcpClient class s GetStream() method. All that socket stuff is now (almost) completely hidden. There are only two catches: First, you need to flush the messages manually using the Flush() method, or the messages stay in the stream s buffer until the buffer is full. Second, you need to catch an IOException from the ReadLine() and WriteLine() methods. When this exception happens, you can assume that the network connection has been closed and you can go ahead and close things up. Listing 19-8. A TCP Client Implementing Helper Classes using using using using namespace namespace namespace namespace System; System::IO; System::Net; System::Net::Sockets;

In the Test Manager window, select the ValidateUserTest and view its properties. Select the ellipsis for the Data Connection String property, and then browse to the ServiceTestDB.mdf file and select it. Leave the Data Access property as Sequential. Next, select the ValidateUserTest table from the Data Table Name property. This will add the DataSource attribute to the ValidateUserTest method in the ServiceTests class (it is much easier to do it this way than typing the attribute in manually). Now that everything is hooked up, you need to be able to read the information from the ValidateUserTest table. To access the information in the row, you use the TestContext.DataRow property and access the data as you normally would from a database, as shown in Listing 12-6.

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void main() { TcpClient^ server; StreamWriter^ writer; StreamReader^ reader; String^ msg; try { server = gcnew TcpClient("127.0.0.1", 12345); writer = gcnew StreamWriter(server->GetStream()); reader = gcnew StreamReader(server->GetStream()); } catch (SocketException^ se) { Console::WriteLine("Connection to server failed with error: {0}", se->Message); return; }

- (void)fontListControllerDidSelect:(NSNotification *)notification { FontListController *flc = [notification object]; UIPopoverController *popoverController = flc.container; [popoverController dismissPopoverAnimated:YES]; [self handleDismissedPopoverController:popoverController]; self.currentPopover = nil; }

Listing 12-6. Data-Driven Test Method C# /// <summary> ///A test case for AddUser (string, string) ///</summary> [TestMethod()] [DataSource("System.Data.SqlClient", "Data Source=.\\SQLEXPRESS; AttachDbFilename=\"C:\\ServiceTestDB.mdf\";Integrated Security=True; User Instance=True", "AddUserTest", DataAccessMethod.Sequential)] public void AddUserTest() { Service target = new Service(); string userName = testContextInstance.DataRow["au_username"].ToString(); string password = testContextInstance.DataRow["au_password"].ToString(); PasswordType type = (PasswordType)testContextInstance.DataRow["au_password_type"]; int expected = Convert.ToInt32(testContextInstance.DataRow["au_expected"]); int actual; actual = target.AddUser(userName, password); if (userName == "Test User 2") _newUserId = actual; Assert.AreEqual(expected, actual, "EffortTrackingServiceTests.localhost.Service.AddUser did " + "not return the expected value."); } VB ''' <summary> '''A test case for AddUser (string, string) '''</summary> <TestMethod()> _ <DataSource("System.Data.SqlClient", "Data Source=.\\SQLEXPRESS; " & _ "AttachDbFilename=\"C:\\ServiceTestDB.mdf\";Integrated Security=True; _ User Instance=True", _ "AddUserTest", DataAccessMethod.Sequential)> Public Sub AddUserTest() Dim target As Service = New Service() Dim userName As String = testContextInstance.DataRow("au_username").ToString() Dim password As String = testContextInstance.DataRow("au_password").ToString() Dim type As PasswordType = _ CType(PasswordType, testContextInstance.DataRow("au_password_type"))

msg = reader->ReadLine(); Console::WriteLine(msg); while (true) { Console::Write("Message ('q' to quit): "); msg = Console::ReadLine(); if (msg->ToLower()->Equals("q")) break; try { writer->WriteLine(msg); writer->Flush(); msg = reader->ReadLine(); Console::WriteLine(msg); } catch (IOException^) { break; // connection lost } } Console::WriteLine("Ended connection with server."); server->Close(); } Okay, I sort of fibbed. There is a third catch. To simplify the client, you should also use a StreamWriter and StreamReader, as shown in Listing 19-8. Notice that the client also places the WriteLine() and ReadLine() methods within a try/catch block. In most cases, a server should not come down with clients attached, but there are no rules saying it can t. Thus, if the WriteLine() or ReadLine() method throws an IOException, you can assume that the server has severed its connection and that you need to close the client connection. One bonus of TcpClient is that it shuts down gracefully on its own and therefore doesn t even provide a Shutdown() method like the Socket class does.

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