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

This is the essential difference between the so-called functional and procedural approaches to coding, by the way. Code that just performs a computation or calculation and returns the result is called functional because it s similar in nature to mathematical functions such as cosine, and square root. Procedural code tends to perform a sequence of actions. In some languages, such as F#, the functional style dominates, but C# programs typically use a mixture of both styles.

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Listing 11-8. Determining whether you are willing to read the file bool TextImageHandler::read( QImage *image ) { QTextStream stream( device() ); QString line; line = stream.readLine(); if( line != "TEXT" || stream.status() != QTextStream::Ok ) return false; line = stream.readLine(); QRegExp re( "(\\d+)x(\\d+)" ); int width, height; if( re.exactMatch( line ) ) { bool ok; width = re.cap(1).toInt( &ok ); if( !ok ) return false; height = re.cap(2).toInt( &ok ); if( !ok ) return false; } else return false; ... } Because the header is valid, you can see the second half of the read method (the source code is shown in Listing 11-9). The reading is very similar to the writing. First, a temporary QImage is created; then each line is read and converted to gray scale. The length of each line is checked against the expected image width, and no unexpected characters in the image data are accepted. If the status of the stream is okay when the entire image has been read, the image given as an argument is updated before true is returned to indicate a successful read. Listing 11-9. Read the image from the device and determine whether it all went well. bool TextImageHandler::read( QImage *image ) { ... QImage result( width, height, QImage::Format_ARGB32 ); for( int y=0; y<height; ++y ) {

You ll have noticed that the dot (.) is being used to mean different things here. We can use it to delineate the namespace name and the type name; for example, System.Console means the Console type in the System namespace. It can also be used to break up a namespace name, as in System.IO. Our example also uses it to indicate that we want to use a particular method provided by a class, as in Console.WriteLine. And as you ll see, the dot turns up in a few other places in C#. Broadly speaking, the dot signifies that we want to use something that s inside something else. The C# compiler works out from context exactly what that means.

<wiki:readOnlyAutoComplete completionList="newArticleTitleCompletionList" serviceURL="<%=ResolveUrl ("~/WebServices/ArticleTitleWebServiceasmx") %>" serviceMethod="GetRelatedDocumentTitlesAsLinks" autoHideCompletionListElementParent="true" /> The first parameter passed to it is the ID of another control: completionList This specifies the target control for the results to get loaded into If you recall from Figure 7-21, there s a big space under the text box where the results get loaded This is the completion list, and the control loads the results of the autocomplete query into it The next parameter is serviceURL This is the location of the web service that hosts the supporting functionality Again, an evaluator is used to locate the absolute URI from the relative ~/WebService/ArticleTitleWebServiceasmx The control and behavior could conceivably be used on any page in the directory structure of the web site, so it s a good idea to use an absolute URI to describe the location of the web service.

Although we picked over every line of code in this simple example, we haven t quite finished exploring what Visual Studio did for us when we asked it to create a new application. To fully appreciate its work, we need to step out of the Program.cs source file and look at the whole project.