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Since there is a TcpClient, you must be thinking that there has to be a UdpClient (and you d be right). The UdpClient simplifies the already simple UDP socket in two ways, though there already isn t much left to simplify. One area that is made easier is that you don t need to worry about binding; the myriad of UdpClient constructors handles it for you. Here is a list of the constructors available to you: UdpClient() UdpClient(AddressFamily^) UdpClient(int port) UdpClient(IPEndPoint^) UdpClient(int port, AddressFamily^) UdpClient(String^ hostname, int port)

Dim expected As Integer = _ Convert.ToInt32(testContextInstance.DataRow("au_expected")) Dim actual As Integer actual = target.AddUser(userName, password) If userName = "Test User 2" Then _newUserId = actual End If Assert.AreEqual(expected, actual, _ "EffortTrackingServiceTests.localhost.Service.AddUser did " _ & "not return the expected value.") End Sub The DataSource attribute indicates to VSTS that an external data source is being used to drive this particular test method. The syntax for the DataSource constructor is Connection String, Table, Access Method. The connection string is a standard database connection string. The table is the table in the database that contains your test data, and the access method is how the test should access the data.

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We have examined all these parameters already in some form in the constructor already covered, but I ll recap them so you don t have to go searching for them. The AddressFamily can be either InterNetwork (version 4 IP address) or InterNetworkV6 (version 6 IP address). The port parameter is an integer from 0 to 65535, but you should not use 0 1024 as these numbers are reserved as well-known ports. IPEndPoint is a combination of the IP address and the port. Finally, hostname is the human-friendly(ish) name you give to an IP address, like the one you type into Internet Explorer. The other benefit of using UdpClient is that you no longer have to worry about not receiving the whole message package by allocating too small a buffer. With UdpClient the Receive() method returns the buffer; all you have to do is provide a handle to return it to. Listings 19-9 and 19-10 contain all the basic code needed for a UDP client-server application using UdpClient. Listing 19-9. A UDP Server That Accepts Multiple Concurrent Clients Using UdpClient using using using using namespace namespace namespace namespace System; System::Net; System::Net::Sockets; System::Text;

Here, you see the reason for putting the container property in FontListController. After the user makes a selection, FontListController shoots off a notification. DudelViewController picks it up, and uses the container property to dismiss the popover. This method also calls the main handler for all our popovers, which you should now revise to this:

void main() { IPEndPoint^ ipep = gcnew IPEndPoint(IPAddress::Any, 54321); UdpClient^ server = gcnew UdpClient(ipep); Console::WriteLine("Waiting for client connection."); array<unsigned char>^ message; while(true) { IPEndPoint^ Remote = gcnew IPEndPoint(IPAddress::Any, 0); message = server->Receive(Remote); Console::WriteLine("[{0}] [{1}]", Remote->ToString(), Encoding::ASCII->GetString(message, 0, message->Length)); server->Send(message, message->Length, Remote); } } Listing 19-10. A UDP Client Using UdpClient using using using using namespace namespace namespace namespace System; System::Net; System::Net::Sockets; System::Text;

Note The access method has no effect on a unit test. The test will always be run using the sequential

void main() { UdpClient^ client = gcnew UdpClient();

IPEndPoint^ Remote = gcnew IPEndPoint(IPAddress::Parse("127.0.0.1"), 54321); while (true) { Console::Write("Message ('q' to quit): "); String^ input = Console::ReadLine(); if (input->ToLower()->Equals("q")) break; array<unsigned char>^ message = Encoding::ASCII->GetBytes(input); client->Send(message, message->Length, Remote); message = client->Receive(Remote); Console::WriteLine("[{0}] {1}", Remote->ToString(), Encoding::ASCII->GetString(message, 0, message->Length)); } } There is not much difference between client and server, is there In Listing 19-10, I threw in the UdpClient class s Send() method s ability to autobind to a port, but you could have just as easily used a UdpClient constructor with more information so that the constructor itself would bind to the port. Just remember that if you do this, the client and IP address and the port pairs must be different.

The test will be run once for every row of data in the table. The DataRow property of the testContextInstance changes for every method according to the DataSource attribute for the method.

- (void)handleDismissedPopoverController:(UIPopoverController*)popoverController { if ([popoverController.contentViewController isMemberOfClass: [FontListController class]]) { // this is the font list, grab the new selection FontListController *flc = (FontListController *) popoverController.contentViewController; self.font = [UIFont fontWithName:flc.selectedFontName size:self.font.pointSize]; } self.currentPopover = nil; }

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