一、tinyxml 库
tinyxml 开源精简版本xml 解析库，相比于libxml2 更适合使用于嵌入式设备当中xml数据的解析和构造
TiXmlBase Class Reference
下载TinyXML的网址：
http://www.grinninglizard.com/tinyxml/
二、tinyxml 编译成.so
1、将tinyxml 拷贝到/home/work/目录下
cptinyxml /home/work/tinyxml
cd/home/work/tinyxml/
2、修改Makefile
vim Makefile
28 DEBUG_CFLAGS := -Wall -Wno-format -g -DDEBUG -fpic -shared # 添加-fpic -shared 生成动态库参数
29 RELEASE_CFLAGS := -Wall -Wno-unknown-pragmas -Wno-format -O3 -fpic -shared# 添加-fpic -shared生成动态库参数
84 OUTPUT := libtinyxml.so # 设置输出lib库
93 SRCS := tinyxml.cpp tinyxmlparser.cpp tinyxmlerror.cpp tinystr.cpp # 删掉原本编译进去的xmltest.cpp
105 ${LD} -o $@ ${LDFLAGS} ${OBJS} ${LIBS} ${EXTRA_LIBS} ${CXXFLAGS} # 加入${CXXFLAGS} 参数，输出最终lib库
3、编译生成libtinyxml.so
make
4、交叉编译移植tinyxml 到开发板，需要修改
22 CC := arm-linux-gcc
23 CXX := arm-linux-g++
24 LD := arm-linux-g++
25 AR := arm-linux-ar rc
三、编写测试例子
1、解析xml 数据<xxxxx>data</xxxxxx> 形式存放的xml数据
test.xml 内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<Message xmlns="http://mns.aliyuncs.com/doc/v1">
<MessageId>6D438C3EE5E6E031-1-1579E5A156F-20000000E</MessageId>
<MessageBodyMD5>009F8E6EDCA8CA12AB5F82F5EBE514F7</MessageBodyMD5>
<MessageBody>{"title":"text","content":"测试消息"}</MessageBody>
<ReceiptHandle>1-ODU4OTkzNDYwNi0xNDc1ODM0MjI3LTEtOA==</ReceiptHandle>
<EnqueueTime>1475830486383</EnqueueTime>
<FirstDequeueTime>1475831421138</FirstDequeueTime>
<NextVisibleTime>1475834227000</NextVisibleTime>
<DequeueCount>2</DequeueCount>
<Priority>8</Priority>
</Message>
以上xml数据都是以 <xxxxx>data</xxxxxx> 形式存放的xml数据
对应的解析程序如下：
#include <stdio.h>
#include "tinyxml.h"
int test_xml(const char *xmlfile)
{
TiXmlDocument* myDocument = new TiXmlDocument();
myDocument->LoadFile(xmlfile);
TiXmlElement* rootElement = myDocument->RootElement();
if (rootElement == NULL || strcmp(rootElement->Value(),"Message"))
return -1;
printf("%s:t %s n",rootElement->Value(),rootElement->GetText());
TiXmlElement* element = rootElement->FirstChildElement();
if (element == NULL || strcmp(element->Value(),"MessageId"))
return -1;
printf("%s:t %s n",element->Value(),element->GetText());
while(1){
element = element->NextSiblingElement();
if(element == NULL){
break;
}
printf("%s:t%sn",element->GetText());
}
myDocument->Clear();
delete myDocument;
}
int main(int argc,char* argv[])
{
if(argc<2){
printf("input xml filen");
return -1;
}
test_xml((const char *)argv[1]);
return 0;
}
2、解析item 类型的xml数据
xml数据格式如下：
<ToDo>
<Item priority="1">
<bold>
Book store!
</bold>
</Item>
<Item priority="2">
book1
</Item>
<Item priority="2">
book2
</Item>
</ToDo>
解析源码：
#include <stdio.h>
#include <iostream>
#include <string>
#include "tinyxml.h"
using namespace std;
int loadXML(const char *xmlfile)
{
TiXmlDocument doc;
if(!doc.LoadFile(xmlfile)){
cerr << doc.ErrorDesc() << endl;
return FAILURE;
}
TiXmlElement* root = doc.FirstChildElement();
if(root == NULL)
{
cerr << "Failed to load file: No root element." << endl;
doc.Clear();
return FAILURE;
}
for(TiXmlElement* elem = root->FirstChildElement(); elem != NULL; elem = elem->NextSiblingElement())
{
string elemName = elem->Value();
const char* attr;
attr = elem->Attribute("priority");
printf("attr = %sn",attr);
if(strcmp(attr,"1")==0)
{
TiXmlElement* e1 = elem->FirstChildElement("bold");
TiXmlNode* e2=e1->FirstChild();
cout<<"priority=1t"<<e2->ToText()->Value()<<endl;
}
else if(strcmp(attr,"2")==0)
{
TiXmlNode* e1 = elem->FirstChild();
cout<<"priority=2t"<<e1->ToText()->Value()<<endl;
}
}
doc.Clear();
return 0;
}
int main(int argc,char* argv[])
{
if(argc<2){
printf("input xml filen");
return -1;
}
if(loadXML(argv[1]))
return -1;
return 0;
}
3、生成xml数据
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>
#include "tinyxml.h"
using namespace std;
int saveXML(const char *file){
TiXmlDocument doc;
TiXmlElement* root = new TiXmlElement("root");
doc.LinkEndChild(root);
TiXmlElement* element1 = new TiXmlElement("Element1");
root->LinkEndChild(element1);
element1->SetAttribute("attribute1","some value");
TiXmlElement* element2 = new TiXmlElement("Element2"); ///元素
root->LinkEndChild(element2);
element2->SetAttribute("attribute2","2");
element2->SetAttribute("attribute3","3");
TiXmlElement* element3 = new TiXmlElement("Element3");
element2->LinkEndChild(element3);
element3->SetAttribute("attribute4","4");
TiXmlText* text = new TiXmlText("Some text."); ///文本
element2->LinkEndChild(text);
bool success = doc.SaveFile((char *)file);
doc.Clear();
if(success)
return 0;
else
return -1;
}
int main(int argc,char* argv[]){
if(argc<2){
printf("input save file n");
return -1;
}
if(saveXML((const char *)argv[1]))
return -1;
printf("save xml ok n");
return 0;
}
生成的xml内容如下：
<root> <Element1 attribute1="some value" /> <Element2 attribute2="2" attribute3="3"> <Element3 attribute4="4" />Some text. </Element2> </root> （编辑：李大同）
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