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The message consumer Now that we have a producer of messages, we need something to consume them. There are several ways that messages can be consumed using the MessageQueue object. Synchronous receive The simplest way to consume a message is to use the MessageQueue s synchronous Receive method. Receive blocks the calling thread until a message can be received. If no messages are in the queue, the method waits until either a message arrives, or, if a timeout is specified, the timeout expires. Listing 17.11 shows the Receive method being used with no specified timeout.

choose View Designer. Then, using the toolbox, drag three labels and three text box controls onto the design surface. Stack the labels vertically. A thin blue line (a snap line) will

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A state diagram shows the entry point (a black filled-in blob) and then arrows that show transition from one state to another. Some of the arrows have guard conditions on them that identify what must happen for the transition to take place. The diagram in Figure 13-11 shows that when the game starts, it moves into the Title Screen state, and then, if the Start button is pressed, the game moves into the Playing Game state. Once the player has no lives left, the game program moves back onto the title screen. State diagrams are very useful for showing how a program will behave and telling the programmer that at certain points, the program must behave in a certain way. For example, the diagram in Figure 13-11 shows that testing the start key when the player is playing the game is unnecessary. Developers often use state diagrams when developing games in which game items have a range of possible states.

Listing 17.11 The Receive method used with no timeout specified (C#)

help guide the alignment. When the labels are aligned correctly, release the label control. As shown in Figure 5-1, a small blue horizontal line also appears to the left of the label control. This line represents the minimum space between a control and another control or between a control and its container.

You can set lots of breakpoints in a program. The program will stop at each breakpoint you ve set for a statement. Real programmers call this hitting a breakpoint, so I suppose we should, too.

System.Messaging.Message msg = messageQueue1.Receive(); string s="(null)"; if (msg != null & msg.Body != null) { s = msg.Body.ToString(); } UpdateMessageDisplay(s);

If you now run the program, you ll see that when it gets to the line that you ve marked as a breakpoint, it stops. This will work whether you re using a PC or a genuine Xbox for the development. This is impressive as a technical feat in that when you re using the Xbox, you re controlling the program remotely from XNA Game Studio 2.0, but I guess that today it s okay to take these things for granted. When your program hits the breakpoint, it will stop and give you the display shown in Figure 10-8.

Microsoft Visual C# 2005 Express Edition: Build a Program Now!

In the case of a Windows Forms application, while the main thread of the application is waiting on Receive to return it is unable to process any Win32 messages. This causes the application to hang and be unresponsive. When a message is received, the application will resume processing the messages. Asynchronous processing using BeginReceive A more desirable way of interacting with a message queue is to use the asynchronous processing support built into the MessageQueue object. Listing 17.12 shows the use of BeginReceive and ReceiveCompletedEventHandler.

10

like the one shown in Figure 5-2.

Listing 17.12 BeginReceive returns before a message is received (C#)

Now that the program has stopped, you can take a look at the values of the variables and see what s gone wrong. This is very easy to do; just rest the mouse pointer over the identifier of the variable in the code that you re interested in. A box will pop up and tell you the value in that variable, as shown in Figure 10-9, where I placed the cursor over the fraction variable.

entered in the text box. To align the labels correctly, move each label until you see a horizontal purple line instead of a blue line, as shown in Figure 5-3. In Figure 5-4, Labels 1 and 2 have been properly aligned with the baseline of the corresponding text box contents, but Label 3 is still aligned with the bottom of the text box itself.

private void button1_Click(object sender, System.EventArgs e) { try { BeginReceive returns messageQueue1.BeginReceive(); before the message is } received catch(Exception ex) { UpdateMessageDisplay(ex.ToString()); } }

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