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catch (SocketException^) { Console::WriteLine("Receive failed with a time out."); Console::WriteLine("Make sure server is running."); } } } In the code, the use of GetSocketOption() is redundant as the default value is 0, but I wanted to show an example of it being used. One thing that threw me is that the ReceiveFrom() method throws a SocketException if no socket is bound to the IPEndPoint it is expecting to receive data from. I first thought that the timeout was working, but when I extended the timeout value, the SocketException still happened immediately. It wasn t until I had the server bind to the socket that the timeout started working properly.

As a best practice, and to make the results of this test more valuable, the error message should also Tip come from the test database. This allows you to more easily tie a failure to a specific entry, since it is difficult to do that with the data displayed. You could also provide the supplied values in the error message. To do this, simply add a description column to each test table and use it to supply the exception message. Now your tests will be self-documenting.

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It is time to change gears and look at another way of coding network programs. In all of the previous examples when the program called a network function, the program blocked (stopped/suspended) until the network function returned or timed out. In many programs this is just fine, and with multithreading that s usually all you need. But there will come a time when you will need the program to not stop/suspend when it encounters a network function, and in those cases you will use asynchronous network functions. (In previous versions of .NET, you would refer to this as asynchronous socket functions, but with version 2 of the .NET Framework TcpListener, TcpClient, and UdpClient were expanded to support asynchronous functionality. Yeah, I know down in their depths these three are socket code as well, so if you want to be picky I guess you can use the term asynchronous socket function and be completely correct.) Asynchronous functions cause the execution of the code to be broken into two threads. When an asynchronous function is called, the processing of the network functionality breaks off and runs in another thread, while the application continues to run on the original thread. Then when the network functionality thread completes, you process any results in a callback function. There really isn t anything that special about writing asynchronous network code; once you figure out how to do it for one asynchronous method, you know how to do it for them all. The reason is that you code all asynchronous methods in almost exactly the same way. Asynchronous methods are basically synchronous methods divided into two parts: the BeginXxx() method, which specifies the callback method and causes the thread to split, and the EndXxx() method, which processes the callback method when the network functionality completes.

To keep the font selector simple, we ll have the size selection as a separate operation, in its own popover. The GUI for the font size selector will consist of a slider, a label showing the slider s value, and a text view showing a preview of the chosen font at the chosen size. As the user operates the slider, the preview immediately reflects the slider s value. Figure 6 4 shows the GUI in action.

The bitwise AND operator compares the bit pattern of its two operands. If both the bits at the same offset in the bit pattern are 1s, the resulting bit pattern will become a 1; otherwise, it will become a 0. For example: 0101 & 0011 becomes 0001

Some tests just cannot be run in an automated fashion. These tests may require some external actions to prepare certain aspects of a server. An example of this may be testing an IIS failure in which the manual step of stopping the World Wide Web service may be required. Or if you are using VSTS, which does not currently support Windows Forms testing, and you want to test the user interface, then manual testing would be the way to go.

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