.NET/ASP.NET/C#/VB.NET PDF Document SDK

This happens to be a special name the C# compiler will expect your program to provide one static method called Main, and it ll run that method when the program is launched The method name is followed by a parameter list, which declares the input the method requires This particular example s parameter list is (string[] args), which says that it expects just a single input and that the code will refer to it using the name args It expects this input to be a sequence of text strings (the square brackets indicating that multiple strings may be passed instead of just one) As it happens, this particular program doesn t use this input, but it s a standard feature of the specially named Main method command-line arguments are passed in here.

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Let s take a look at how this has been implemented using Atlas. This functionality, similar to the login functionality you saw earlier, is implemented on the master page. In this case, Atlas Script is used, and you can see the script here: <textBox id="<%= titleTB.ClientID %>"> <behaviors> <wiki:readOnlyAutoComplete completionList="newArticleTitleCompletionList" serviceURL="<%=ResolveUrl ("~/WebServices/ArticleTitleWebService.asmx") %>" serviceMethod="GetRelatedDocumentTitlesAsLinks" autoHideCompletionListElementParent="true" /> </behaviors> <validators> <regexValidator regex="/[A-Za-z\d \,\.\ ]+/" /> </validators> </textBox> First it assigns the text box to point at a specific control. It does this using an evaluator that assigns the ID to the bizarre-looking <%= titleTB.ClientID %>, which evaluates the ID of the titleTB control and assigns it to the ID of the Atlas TextBox control. This is good practice when you are using a master page scenario; because the ID is evaluated at runtime, you don t hard-code it at design time. To get autocomplete functionality with this control, you use a behavior. However, as you ll see from the code, the behavior is a new one you haven t seen yet and is tagged as a <wiki:readOnlyAutoComplete> behavior. The wiki: prefix indicates that it is a control in the wiki namespace, and this namespace is defined in JavaScript libraries as you saw in earlier chapters. In this case, the Editor.js and ReadOnlyAutoComplete.js files in the Controls directory define this namespace. If you look at ReadOnlyAutoComplete.js, you ll see this code: Type.registerNamespace('Wiki'); Wiki.ReadOnlyAutoCompleteBehavior = function(associatedElement) { Wiki.ReadOnlyAutoCompleteBehavior.initializeBase(this); Type.registerSealedClass('Wiki.ReadOnlyAutoCompleteBehavior', Web.UI.Behavior); Web.TypeDescriptor.addType('wiki', 'readOnlyAutoComplete', Wiki.ReadOnlyAutoCompleteBehavior); This implements the complete behavior. As you can see at the bottom, it is registered as a sealed class that derives from Web.UI.Behavior, making it an overridden behavior. So, now that you know where this comes from, let s take a look at the behavior declaration again:

status() != QTextStream::Ok ) return false; return true; } Most fonts today are not monospace, which means that the width of a character depends on the character; an i requires less space than an M Another problem is that most fonts are higher than they are wide The ASCII art image plugin does not take this into account, so even if a monospace font is used, the result appears to be stretched It s hard to compensate for this in the write method because you never know which font the user will use to view the image All in all, the results are not perfect, but you can still tell what the image shows..

We ll return to this later in the chapter when we write a program that makes use of command-line arguments, but for now, our example doesn t use it So we ll move on to the final part of the example the code inside the Main method that was the one part we added to Visual Studio s contributions and which represents the only work this program does:.

Console.WriteLine("Hello, world");

This shows the C# syntax for invoking a method. Here we re using a method provided by the Console class, which is part of the .NET Framework class library, and it is defined in the System namespace. We could have written the fully qualified name, in which case the code would look like this:

Figure 11-3. The source image alongside the resulting ASCII art Although writing is a straightforward process, reading is quite the opposite because you can never trust the input stream to be valid. It can contain anything, including something completely unexpected (corrupted data or a completely different file format, for example), or the file might be missing data. This means that the read method is more complex than the write method. In Listing 11-8 you can see how the header is read and validated. As with writing, it starts with a QTextStream being created. The first line is read, and you ensure that it equals TEXT. If it does not, the entire operation is aborted. The dimensions, which follow the first line, are matched and filtered out using a regular expression. If the expression fails to match, or if any of the dimensions fails to convert to a number, the operation is aborted. Now you know that the header is okay so you can start reading the image data.

System.Console.WriteLine("Hello, world");

But because of the using System; directive earlier, we can use the shorter version it means the same thing, it s just more concise. The Console class provides the ability to display text in a console window and to read input typed by the user in an old-fashioned command-line application. In this case, we re invoking the class s WriteLine method, passing it the text "Hello, world". The WriteLine method will write whatever text we provide out to the console window.