itextsharp barcode vb net Using the Node s userData Field in Java

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Using the Node s userData Field
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Occasionally, it is useful to store some application-specific data with a particular document node, or perhaps the entire document For example, your application may
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display some data in a user interface that is associated with a particular node, and it may be inefficient to regenerate the data each time you want to display it The DOM_Node class cannot be subclassed, so the Xerces library provides a separate mechanism for storing application-defined data with document nodes Each node has a property named userData, which can be accessed using the Xerces API methods setUserData() and getUserData() Note, however, that the memory pointed to by the userData field is not automatically deleted for you when the node is deleted It is your application s responsibility to delete any memory pointed to by this field This code shows how to set and retrieve the userData field:
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DOM_Node myNode; typedef struct { int someValue; char *someString; } myStruct, *myStructPtr; // make a new myStruct and give it some values // NOTE: your responsibility to delete! myStructPtr theData = new myStruct; theData->someValue = 5; theData->someString = new char[10]; strcpy(theData->someString, "hello"); // set the user data field // assume we somehow got a Node from the document myNodesetUserData(theData); // later on, we can retrieve it theData = (myStructPtr)myNodegetUserData(); delete [] theData->someString; delete theData;
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The DOM method cloneNode() does not clone the data pointer associated with the userData field The Xerces FAQ has an in-depth discussion of why this decision was made, but the upshot is that if you want to clone the userData pointer along with the node, you will have to write your own wrapper interface that performs the cloning operation
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It should be noted that the userData field is considered an experimental part of the Xerces DOM API, and it may disappear in future versions The new DOM Level 3
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The Document Object Model: Processing Structured Documents
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specification, although not yet final, is considering a mechanism that would be more flexible than the current userData implementation in Xerces (more on this in 11)
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Where to Get More Information About Xerces
The Xerces website is a good source for information, providing quality documentation along with a maintained FAQ and several good example projects to use as starting points for your own projects In addition, the Xerces parser is supported by a community of knowledgeable developers on the xerces-c-dev and xerces-j-dev mailing lists who are always willing to help new developers Before posting a question to the mailing list, however, make sure you read the FAQ many of the most commonly asked questions are already answered there, and it will save you a lot of time (and embarrassment) if you can find an answer to your question there first
The Microsoft MSXML Parser
The MSXML parser is Microsoft s implementation of the Core DOM Level 1 interfaces, along with a collection of Microsoft-specific extension APIs MSXML version 4 also provides support for XML Schema (XSD), XPath 10, the SAX2 API (an alternative to DOM processing), and XSLT 10
Where to Get MSXML4
You can download MSXML4 from the Microsoft Developer Network website at http://msdnmicrosoftcom Go to the MSDN Downloads | Web Development | XML Web Services area, and you will find installers for the current version of MSXML in a variety of languages, along with the redistributable files necessary to include with your application so it can use the MSXML library
Installing MSXML4
When MSXML4 is installed on the user s computer, it is installed in what Microsoft calls side-by-side mode, in which any previous existing version of MSXML is left untouched This prevents introduction of incompatibilities with previous versions; different versions of the Microsoft Windows operating system and Microsoft Internet Explorer are released with different versions of MSXML
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The MSXML4 SDK installation creates an MSXML 40 directory on the computer s hard drive containing three directories: doc, inc, and lib The doc directory contains the MSXML4 SDK documentation in a standard WinHelp file The inc folder contains the MSXML header files that contain the necessary DOM definitions, and the lib folder contains the import library that your application must link to in order to use the MSXML4 DLL
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