how to create barcode in vb net 2012 The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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This code creates three objects: a comment, an element, and a text node, and appends them to a document object named doc (assuming the code has earlier either created this document or retrieved it from somewhere else, like the parser)
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Parsing a Document File
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Documents are not always created in memory from scratch The much more common case is one where you have a document stored in persistent memory, such as on disk, and you want to load and parse it to build a DOM structure There is no standard way of accomplishing this in the DOM API under Levels 1 or 2, so each implementation is free to provide its own methods for doing this The way Xerces accomplishes this task is by providing a class called InputSource An InputSource specifies a source of data, whether it is a file, memory buffer, URL, and so on The Xerces library reads data from the InputSource and constructs a DOM from it In addition to specifying a source of data, the Xerces parser allows the application to set a variety of parser configuration options that are used when the file is parsed, such as whether to use validation, whether to use namespaces, what kind of error handler to use, and so on The Xerces library provides InputSource-derived classes for files, memory buffers, URLs, and standard input You will never use the InputSource class directly; your application will make use of one of the derived classes, depending on the source of the data This process is illustrated here:
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LocalFileInputSource *theSource; // input source for the file // define some default options for the parser DOMParser::ValSchemes valScheme = DOMParser::Val_Auto; bool bNamespaces = false; bool bSchema = false; // create the parser (ok to use new() here because // DOMParser is not a DOM_ class) DOMParser* parser = new DOMParser; // set the parser options parser->setValidationScheme(valScheme); parser->setDoNamespaces(bNamespaces); parser->setDoSchema(bSchema); // parse the file theSource = new LocalFileInputSource("myfilexml"); try { parser->parse(theSource);
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} catch { // } catch { // } catch { // }
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(const XMLException& toCatch) handle the XMLException (const DOM_DOMException& toCatch) handle the DOMException () handle all other kinds of exceptions, like memory exceptions
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// get the document from the parser DOM_Document doc = parser->getDocument(); // perform any document operations delete theSource; // deallocate the memory we allocated earlier delete parser;
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In this example, some local variables are first declared that will store the input source for the document and some parsing options In particular, the valScheme variable is set to the constant value DOMParser::ValAuto, which means perform automatic validation if a DTD is present in the file Other possible values are ValNever, which means never validate; and ValAlways, which means always validate The bNamespaces and bSchema variables are each set to false, indicating that you do not want the parser to handle namespaces or schemas Next, a DOMParser object is created on the heap This is okay to do here because DOMParser is not a DOM class, but a utility class provided by Xerces that parses an InputSource and builds a DOM_Document After the parser is created, the various options are set by calling the setValidationScheme, setDoNamespaces, and setDoSchema methods A LocalFileInputSource, which is one of the InputSource-derived classes, is created on the application heap, along with the path to the file to parse (hard-coded here to "myfilexml") Once everything is ready, the parser s parse() method is called, which reads the input source and creates a document This method can throw exceptions, so you need to surround the call with a try-catch block to catch any exceptions that arise There are two specific handlers for DOM_DOMExceptions (which means there s something wrong with the document
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