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书接上回，这篇介绍那个MContentHandler的实现，这是SAX解析方法的核心所在。
先看看我要解析的XML文件如下所示，其实很简单，因为它除了Element和Attribute以外没有其它东西了。
<?xml version="1.0" encoding="utf-8" ?>
<channels>
<channel id="10" title="时政" >
<content id="1001" title="广东牛奶中毒事件污染源调查结果1周后公布"/>
<content id="1002" title="河南淅川公安局因儿童被拐案设'局耻日'"/>
<content id="1003" title="深圳大学135名师生感染病毒引发腹泻"/>
</channel>
<channel id="11" title="国际">
<content id="1101" title="巴以将于4月7日恢复领导人级和谈"/>
<content id="1102" title="古巴解除长期禁令允许国民入住涉外酒店"/>
<content id="1103" title="联合国决定继续对刚果(金)实行武器禁运"/>
<content id="1104" title="俄拒绝接受美国进攻性战略武器问题建议"/> ......
Reviewer Approved
The following example shows how to parse XML file using Symbian OS C++ class, CParser. CParser is basically a SAX (Simple API for XML)-based XML parser.
It uses an active object to read the XML file chunk by chunk (see CXmlHandler::StartParsingWithAoL() method). On each chunk, it passes the buffer to the XML parser. When the XML parser finds an element, it calls the respective callback functions, for example CXmlHandler::OnStartElementL() or CXmlHandler::OnEndElementL().
To use CParser class, the XmlFramework.lib has to be included in the .mmp file. For more information about CParser, please visit some links at the end of this page.
Contents
[hide]
1 XmlHandler.h
2 XmlHandler.cpp
3 download example
4 See Also
[edit] XmlHandler.h
#ifndef __XMLHANDLER_H__
#define __XMLHANDLER_H__
// INCLUDE FILES
#include <e32base.h>
#include <f32file.h> // ......
Paul.Todd | 09 April, 2007 15:24
I have noticed a couple of people seem to be having problems with using the XML parser in Symbian and there are no examples outside of the devkit. The parser I will be talking about is the xml one, not the one SOAP engine as the SOAP one is Nokia specific.
The key to parsing XML is to understand how SAX based parsing works.
The key to using the Symbian XML API is to understand how SAX works and how its been implemented in Symbian.
SAX is at its core an event driven model that supports data being streamed, making it ideal for devices.
The foundation of the parser is the MContentHandler class which provides the callback interface you need to implement. In fact the first thing you need to do is to create a class deriving from MContentHandler that implements all of the pure virtual methods of MContentHandler
You can then create a CParser class and use your implementation of MContentHandler to provide the call backs required. You will normally only ......
antonypr | 14 April, 2007 00:05
A couple of weeks ago, I had a plan to write an article and example code of using XML parser in Symbian OS. It seems that another Forum Nokia Champion, Paul Todd had the same idea. He posted a nice article about XML parser in Symbian OS 9.x to Forum Nokia Blogs. It's good that I don't need to write the same article. :)
What I would like to share here is a complete example code of XML Parser in Symbian OS. The example code can be run on Symbian OS 8 and 9 phones, which means it can be compiled under S60 2nd Edition FP2/FP3 SDK or S60 3rd Edition SDK. I am planning to release the same example code for UIQ3 soon.
Click here to download my example code of XML parser
The example basically parses an XML file, dataexample.xml, to the main window. The content will be displayed on CEikEdwin control (see picture below).
Note that the code is written as an example; thus it is designed to be as simple as possible. Do not use it in the production code!
On ......
1. login_window.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg_logo"
>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:text="@string/user_name"
/>
<EditText
android:id="@+id/username"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:scrollHorizontally="true"
android:autoText="false"
android:text="user"
android:capitalize="none"
android:gravity="fill_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
......
XML 元素
元素命名
XML元素必须遵守以下的命名规则：
名字可包含字母、数字以及其他的字符
名字不能以数字或者标点符号开始
名字不能以字符“xml”（或者XML、Xml）开始
名字不能包含空格
当您“发明创造”元素名称时，请留意并遵循下面的简单的规则：
您可以使用除保留字外的任何名称，但是理想的做法是使名称具有描述性。使用下划线的名称也是不错的。
例子: <first_name>，<last_name>
应该在名称中避免"-"和"."。比方说，如果您将某个元素命名为"first-name"，那么当您的软件试图从first段来提取名称时可能会出现混乱的局面。或者如果您将某个元素命名为"first.name"，您的软件也许会认为"name"是"first"对象的一个属性。
元素名称可以是你希望的任何长度，但是也不要太夸张。名称应当比较简短，比如：<book_title>，而不是：<the_title_of_the_book>。
XML文档经常有一个对应的数据库，其中的域会对应XML文档中的某个元素。有一个实用的经验，即使用数据库的名称规则命名XML文档中的元素。
非英语的字母比如éòá也是合法的XML元素名，不过需要注意当软件开发商不支持字母时出现� ......
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