Poco库XML文件的生成与解析

来源：互联网发布：电脑有网络但上不到网编辑：程序博客网时间：2024/05/16 02:51

vs2010环境开发

注意：

编译时要记得添加静态库路径，以及包含的头文件路径。如果要直接跑程序，需要将涉及的静态库的动态库版本放置到程序所在的路径下。以便程序自己可以找到。

#include "Poco/DOM/Text.h"  #include "Poco/DOM/Element.h"  #include "Poco/DOM/Comment.h"  #include "Poco/DOM/ProcessingInstruction.h"  #include "Poco/DOM/Attr.h"  #include "Poco/DOM/Document.h"#include "Poco/AutoPtr.h"#include "Poco/DOM/DOMWriter.h"#include "Poco/XML/XMLWriter.h"#include "Poco/FileStream.h"#include "Poco/Util/XMLConfiguration.h"

using Poco::Util::XMLConfiguration;  using Poco::AutoPtr;#pragma comment(lib,"PocoFoundation.lib")#pragma comment(lib,"PocoXML.lib")#pragma comment(lib,"PocoUtil.lib")

xml文件的生成代码

AutoPtr<Poco::XML::Document> pDoc = new Poco::XML::Document;  AutoPtr<Poco::XML::Element> myRoot = pDoc->createElement("Root");  AutoPtr<Poco::XML::Element> myChild = pDoc->createElement("Child");  AutoPtr<Poco::XML::Element> myGrandChild = pDoc->createElement("GrandChild");  AutoPtr<Poco::XML::Text> nameNode = pDoc->createTextNode("my_name_is_xiaoqiang");  AutoPtr<Poco::XML::ProcessingInstruction> pi = pDoc->createProcessingInstruction("xml","version='1.0' encoding='UTF-8'" );  AutoPtr<Poco::XML::Comment> comm = pDoc->createComment("new_day");  myGrandChild->appendChild(nameNode);  myChild->appendChild(myGrandChild);  myRoot->appendChild(myChild);  pDoc->appendChild(pi);  pDoc->appendChild(comm);  pDoc->appendChild(myRoot); Poco::XML::DOMWriter write;  write.setOptions(Poco::XML::XMLWriter::PRETTY_PRINT);  Poco::FileStream ofs("./example.xml",std::ios::in);  write.writeNode(ofs,pDoc);

xml文件的读取

要注意：读取文件时如果找不到对应的Key值，Poco内部会抛出异常直接崩溃。推荐捕获异常，然后返回false之类的才好。

    AutoPtr<XMLConfiguration> pConfig(new XMLConfiguration("./example.xml"));      //std::string prop1 = pConfig->getString("prop1");        //int prop2 = pConfig->getInt("prop2");         //std::string prop3 = pConfig->getString("prop3");      //      //std::string prop4 = pConfig->getString("prop3.prop4");      //prop4 = pConfig->getString("prop3.prop4[@attr]");      //prop4 = pConfig->getString("prop3.prop4[1][@attr]");  std::string prop1 = pConfig->getString("Child.GrandChild");  int i=0;      //int prop2 = pConfig->getInt("prop2");         //std::string prop3 = pConfig->getString("prop3");      //      //std::string prop4 = pConfig->getString("prop3.prop4");      //prop4 = pConfig->getString("prop3.prop4[@attr]");      //prop4 = pConfig->getString("prop3.prop4[1][@attr]");

最好要捕获下异常，防止程序崩溃

std::string prop1;try{prop1 = pConfig->getString("Child.GrandChilds");  }catch(...){}

附录：

<config><prop1>value1</prop1><prop2>123</prop2><prop3><prop4 attr="value3" /><prop4 attr="value4" /></prop3></config>

<?xml version='1.0' encoding='UTF-8'?><!--new_day--><Root><Child><GrandChild>my_name_is_xiaoqiang</GrandChild></Child></Root>

1 0