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The .NET Framework is designed with a heavy use of method overloading. Most methods are overloaded several times so that you can call the version that requires only the parameters you choose to supply. COM, on the other hand, does not support method overloading. Instead, COM components usually use methods with a long list of optional parameters. Unfortunately, C# does not support optional parameters, which means C# developers are often forced to supply numerous additional or irrelevant values when accessing a COM component. And because COM parameters are often passed by reference, your code cannot simply pass a null reference. Instead, it must declare an object variable and then pass that variable. You can mitigate the problem to some extent by supplying the Type.Missing field whenever you wish to omit an optional parameter. If you need to pass a parameter by reference, you can simply declare a single object variable, set it equal to Type.Missing, and use it in all cases, like this: private static object n = Type.Missing;

When writing code in any language, it is important to remember to include written comments about what each line or group of statements is doing. To keep the JavaFX interpreter from trying to execute this text, you must hide it between comment characters. Table 2-1 shows the two types of comments available in JavaFX.

CHAPTER 12 s LIGHTS, CAMERA, ACTION!

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The following example uses the Microsoft Word COM objects to programmatically create and show a document. Many of the methods the example uses require optional parameters passed by reference. You will notice that the use of the Type.Missing field simplifies this code greatly. Each use is emphasized in the code listing. using System; namespace Apress.VisualCSharpRecipes.12 { class Recipe12_08 { private static object n = Type.Missing; static void Main(string[] args) { // Start Word in the background. Word.ApplicationClass app = new Word.ApplicationClass(); app.DisplayAlerts = Word.WdAlertLevel.wdAlertsNone; // Create a new document (this is not visible to the user). Word.Document doc = app.Documents.Add(ref n, ref n, ref n, ref n);

Console.WriteLine(); Console.WriteLine("Creating new document."); Console.WriteLine(); // Add a heading and two lines of text. Word.Range range = doc.Paragraphs.Add(ref n).Range; range.InsertBefore("Test Document"); string style = "Heading 1"; object objStyle = style; range.set_Style(ref objStyle); range = doc.Paragraphs.Add(ref n).Range; range.InsertBefore("Line one.\nLine two."); range.Font.Bold = 1; // Show a print preview, and make Word visible. doc.PrintPreview(); app.Visible = true; // Wait to continue. Console.WriteLine(Environment.NewLine); Console.WriteLine("Main method complete. Press Enter."); Console.ReadLine(); } } }

JavaFX offers a wide range of functionality to cater to varied requirements of RIA. In this section, you will see a summary of all the graphics-related packages available in JavaFX with a brief description of what they offer, in Table 12-1. You will find more detailed explanations of the APIs as you read through this chapter further. Table 12-1. Graphics API Summary

Then verify that the page actually shoots you an e-mail. Pretend to be a visitor and bring up the contact form in your browser. Enter your own e-mail address in the Your e-mail address box, write yourself a message, and click the Submit button. You should receive the message in your mailbox. If you don t receive it, verify that you entered the correct e-mail address in the properties of the form. If the address is correct but you still don t receive a message, verify that you re checking the right mailbox. If the e-mail address is from your domain, verify that you created it to begin with! Repeat these steps, this time using an e-mail address that s not from your domain a Yahoo! or an MSN address, for example. Nonworking contact forms are a big nuisance the sender gets the impression that he sent you a message, but you never bothered to answer it. Don t let that happen to you.

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