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Tip If you want to record sounds outside, and don t want to drag a laptop around with you, buy a cheap dictaphone. The quality may suffer a little because you are not recording straight to high-quality digital, but you can always clean up the sound with Audacity (http://audacity.sourceforge.net/) or similar software.

In fact, the base Control class, which all forms derive from, itself derives from the Component class, as shown in Figure 1-3 Component classes are fairly straightforward They simply need to implement the IComponent interface (from the SystemComponentModel namespace) The IComponent interface is quite simple (if a little unintuitive): Public Interface IComponent Inherits IDisposable Event Disposed As EventHandler Property Site As ISite End Interface.

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Figure 1-3. Control and component inheritance Essentially, IComponent extends IDisposable (which forces objects to implement a Dispose() method that releases resources). On top of that, IComponent adds an event that fires when it s been disposed and a Site property. The Site property binds the component to its container. This is the starting point that allows a container (like a form) to manage a collection of components. Most components don t implement IComponent directly. Instead, they take a simpler shortcut, and derive from the System.ComponentModel.Component class, which provides a standard implementation of IComponent. One awkward difference between controls and components is the way that they re tracked in a form. As you ve already seen, the Form class includes a Controls collection that tracks every control on the form. Unfortunately, components don t use a similar model of containment. Instead, components are given the option of adding themselves to a private component container called components. The component container isn t a part of the basic Form class. However, Visual Studio automatically defines it and adds it to every form class you create. The component container is intended only to help make sure components are cleaned up properly. It s not meant to help you keep track of what components a form uses. The general rule of thumb is that if a component holds on to unmanaged resources, it should add itself to the component container. This way, when the form is destroyed it can dispose of any components that need to be released. However, if a component doesn t use unmanaged resources and doesn t need any special cleanup, it probably won t add itself to the component container at all.

private void btnStartListener_Click(object sender, EventArgs e)

Note The component container is one of the messier workarounds in .NET. One problem is that, because

the component must add itself to the container, there s no way for you to tell just by looking at your form code whether or not a given component will be added. For a hands-on look at components, be sure to read 18, which develops a set of validation components and considers how you can track them in a form.

{ string _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;"; try { OracleConnection _connObj = new OracleConnection(_connstring); // Create a new queue object OracleAQQueue _queueObj = new OracleAQQueue("EDZEHOO.MY_JOBS_QUEUE", _connObj); _connObj.Open(); // The Listen function is a blocking call - it will wait // indefinitely until a message is received. _queueObj.Listen(null); // Once we're here this means a message has been detected in the queue. // We can now proceed to dequeue that message OracleTransaction _txn = _connObj.BeginTransaction(); // Dequeue the message. _queueObj.DequeueOptions.Visibility = OracleAQVisibilityMode.OnCommit; _queueObj.DequeueOptions.Wait = 10; OracleAQMessage _deqMsg = _queueObj.Dequeue(); MessageBox.Show("Dequeued Payload Data: " + ConvertFromByteArray((byte[])_deqMsg.Payload) + "\n" + "Dequeued Payload Hex: " + ConvertToHexString((byte[])_deqMsg.Payload) + "\n" + "Message ID of Dequeued Payload : " + ConvertToHexString(_deqMsg.MessageId) + "\n" + "Correlation : " + _deqMsg.Correlation); _txn.Commit(); _queueObj.Dispose(); _connObj.Close(); _connObj.Dispose(); _connObj = null; } catch (Exception ex) {

To start recording sound effects, you will need a microphone. You can use either a standard microphone with a 2.5mm jack that plugs into the mic socket of your sound card, or a USB microphone that is specifically designed for computers. Both will give good results, but it is best to avoid headset microphones because they tend to be optimized for recording voice rather than general sound effects. In addition to the microphone, you will need software to sample the sound and save it to your hard drive. Most operating systems come with a basic program that can record sound, but you will likely get better results from other sound software such as Audacity (Figure 10-3), which is an open source application for Windows, Mac OS X, and Linux. You can download Audacity (for free) from http://audacity.sourceforge.net/.

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