itextsharp barcode vb net Getting to Know the API in Java

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Getting to Know the API
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The MSXML API prefixes the DOM class names with IXMLDOM Thus, the Document interface becomes IXMLDOMDocument, Element becomes IXMLDOMElement, and so on Most of the names are direct matches, with a few exceptions (for example, the MSXML parser names the Attr interface IXMLDOMAttribute) Using the MSXML DOM interfaces is relatively straightforward, assuming that you are familiar with the things you need to do to work with COM interfaces, such as using VARIANT data types, checking HRESULT return values from functions, and using BSTRs instead of regular strings The documentation provided with the MSXML SDK is fairly complete and well documented, although a little light on sample code snippets This is compounded by the unfortunate fact that, unlike the Xerces distribution, the MSXML SDK installer does not install any example code to learn from It takes some searching, but it is possible to find some sample code on the MSDN site under the Web and Internet Samples Home page at (http://msdnmicrosoftcom/downloads/samples/internet/ defaultasp) There is a separate section under XML for downloading XML-related sample code, whether you are using C++, Visual Basic, ASP, NET, or JScript This section, like the Xerces one preceding it, will focus on C++, although the concepts illustrated here are easily portable across other language binding implementations
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Using MSXML4
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To use MSXML4, your application needs to initialize the COM interfaces for the application s thread, obtain the appropriate MSXML interfaces, and call the desired DOM methods In this section, we will examine how some common DOM operations are performed using the MSXML library This section assumes that you
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The Document Object Model: Processing Structured Documents
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are familiar with Microsoft s COM specification and using COM classes If you are not familiar with COM, you should still be able to follow along A full tutorial on COM is beyond the scope of this chapter and book; more information on COM is available on the MSDN site and from several third-party books on the subject
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Initializing the Parser
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Nothing special needs to be done to initialize the MSXML parser outside of initializing the COM system, which must be done before you can call any COM methods To initialize COM and begin using the MSXML parser DOM classes, your application calls the CoInitialize() method like this:
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CoInitialize();
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For each successful call to CoInitialize(), your application must call the CoUninitialize() method to close the COM library and free any resources that it is maintaining The call to CoUninitialize() looks like this:
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CoUninitialize();
Creating a Document
Creating a new DOM Document in MSXML is accomplished in two steps First, you must retrieve the class ID (CLSID) of the COM class you wish to create, which in this case is the class ID for DOMDocument Next, you call CoCreateInstance() to create an instance of the class For example, the code to create a new, empty DOM Document can be written as
// Get the CLSID for the MSXML4 DOMDocument CLSID CLSID_DOMDocument40; HRESULT hr; hr = CLSIDFromProgID(OLESTR("Msxml2DOMDocument40"), &CLSID_DOMDocument40); // now create a new instance of the document IXMLDOMDocument *pDocument = NULL; hr = CoCreateInstance(CLSID_DOMDocument40, // Class of object to create NULL, // pointer to Iunknow interface Leave as NULL CLSCTX_INPROC_SERVER, // context for the newly created object IID_IXMLDOMDocument2, // ID of the interface being requested (LPVOID *)&pDocument // receives the new document );
After the call to CoCreateInstance(), the returned DOM document in the pDocument pointer is empty and ready to receive content
6: Applications
Adding Content to Documents
Once you have obtained a pointer to the DOMDocument interface, you can use it to add new document objects to the document The MSXML parser provides the standard DOM interfaces needed to create the various types of document elements For example, to add elements to the newly created document in the previous example, the following code could be used:
BSTR sNodeName = NULL; IXMLDOMElement *pElem = NULL; IXMLDOMNode *pNode; IXMLDOMText *pText; // new node named "rootNode" sNodeName = ::SysAllocString("rootNode"); pDocument->createElement(sNodeName, &pElem); // append new root node, get back result node pDocument->appendChild(pElem, &pNode); ::SysFreeString(sNodeName); pElem->Release(); // new node named "firstNode" sNodeName = ::SysAllocString("firstNode"); pDocument->createElement(sNodeName,&pElem); pNode->appendChild(pElem, &pNode); ::SysFreeString(sNodeName); pElem->Release(); BSTR sText = ::SysAllocString("New Text Node"); pDocument->createTextNode(sText, &pText); pNode->appendChild(pText, &pNode); ::SysFreeString(sText); pText->Release();
This code creates a new root node for the document, named rootNode It then creates an Element named firstNode, which it appends to the root node Finally, it creates a new Text node with the text New Text Node, which is appended as the first child of the node firstNode The resulting document structure looks like this:
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