![]() ![]() When the file adapter was used, the XML pipeline would throw an exception during disassembly when the illegal UTF-8 character was encountered. Occasionally, a UTF-8 XML document would contain an illegal character. The JMS BizTalk adapter was replacing the File Adapter as the customer was moving to a messaging solution centered on JMS. Recently, a customer using the JNBridge JMS Adapter for BizTalk Server ran into some unexpected behavior. To be absolutely sure, you need a good binary editor that has the ability to convert between encodings according to the specifications behind the encodings. The problem is that just viewing the document in a text editor isn’t going to tell you that. If the document is composed without regard to the underlying encoding, it’s very easy to end up with an UTF-8 document containing an illegal character. In UTF-8, the degree symbol is multi-byte, 0xC2B0. In Windows 1252 (and many other encodings), the degree symbol in hex is 0xB0, a single byte. However, the degree symbol, °, is different. My point is that the very first line of the document,, doesn’t necessarily indicate that what you see is what you get.įor the most part, UTF-8 and Windows 1252 encodings are identical if all the characters are single byte. When I paste the XML into another editor and save it to disk, the resulting encoding will not be UTF-8 because the encoding copied and pasted is Windows 1252. Lets say I highlighted and copied the XML from the Visual Studio XML editor to the clipboard. However, if I compose this same document in a generic text editor and save it to disk, the encoding will most likely be Windows 1252, not UTF-8. If this file is saved to disk, the encoding is truly UTF-8, including the UTF-8 Byte Order Marker. Consider this simple XML document composed in the Visual Studio XML editor: ![]() ![]() Next time, I'll talk about the DOM object itself and how to add, remove, and query nodes.How does one view an XML document? Notepad, or the XML editor in Visual Studio? XML is text, after all, so theoretically any text editor will do the job. Working with stylesheets is pretty complicated so I'm not going to delve into them here. The xslt function takes a DOM object or a filename or url specifying an XML document, a filename or url specifying an XSL stylesheet, and the output destination and performs the transform. The final XML function provided by MATLAB deals with transforming XML documents with XSL Stylesheets. In that case, you just need to adjust the amount of memory available to Java, using the new preference panel. This means that if you read in a 200MB XML file, you're going to run out of memory, no matter how much free main memory MATLAB says is available. The amount of memory set aside for Java is system dependent, but is generally between 64 and 256 MB. One gotcha when working with xmlread is that because the created DOM object is a Java object, it is stored in Java memory. Of course, you can also use xmlwrite to save the XML document to disk, by calling xmlwrite with the following signature: xmlwrite(outfile,xDoc) Without any additional arguments, xmlwrite will display the contents of the DOM in the Command Window: xmlwrite(xDoc) Just to make sure this object has all our XML text, let's use the next MATLAB XML function: xmlwrite. To learn more about interacting with Java objects in MATLAB, see my previous article. The " null" is simply what the .DeferredDocumentImpl's implementation of toString() dumps to the MATLAB Command Window. The xmlread function returns a Java object that represents the file's Document Object Model, or DOM. Xmlfile = fullfile(matlabroot, 'toolbox/matlab/general/info.xml') ĭon't worry that the return value says: " ". This function takes either a URL or a filename and creates a Java XML object in the workspace: There are three functions in MATLAB to specifically deal with XML files. Today I'm going to describe the functions for reading, writing, and transforming XML files. This will be the first in a series of non-consecutive posts about working with XML in MATLAB. Fortunately for us, MATLAB has some built in functions for handling XML file. Much of the data on the Internet is stored in some flavor of XML. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |