TinyXml 读写XML文件 .

使用Tinyxml创建和读取XML文件的优点：1，可在Windows和Linux中使用；2，方便易学，易用，可在http://sourceforge.net/projects/tinyxml/获取源代码。将其中的文件tinystr.h，tinyxml.h，tinystr.cpp，tinyxmlerror.cpp，tinyxmlparser.cpp和tinyxml.cpp拷贝到您的工程目录，即可方便使用。

    下边我写了一个简单的测试程序，创建XML文件，之后从该文件中读取XML节点元素。测试程序在VS2005中测试通过。

#include <iostream>
#include "tinyxml.h"
using namespace std;
#pragma warning(disable:4996)
#define  XML_STR_FILE           "cat.xml"
#define  XML_STR_ROOT           "xml-root"
#define  XML_STR_CAT_INFO       "cat-info"
#define  XML_STR_CAT_NUM        "num"
#define  XML_STR_CAT_AGE        "age"
#define  XML_STR_CAT_COLOR      "color"
#define  XML_STR_CAT_NAME       "name"
#define  IN
#define  OUT
#define  RET_OK                 0
#define  RET_ERR                -1
#define  NAME_LENGTH            20
#define  COLOR_LENGTH           20
#define  BUF_SIZE               32
#define  XML_RETURN(x)          { if( RET_OK != (x) ) return RET_ERR; }
#define  XML_ASSERT(x)          { if( NULL == (x) ) return RET_ERR; }
struct CAT_INFO
{
    CAT_INFO():iAge(0)
    {
        szName[0] = '/0';
        szColor[0] = '/0';
    };
    int iAge; //age
    char szName[NAME_LENGTH]; //name
    char szColor[COLOR_LENGTH]; //color
};
typedef CAT_INFO * PCAT_INFO;
class Cat_List_Info
{
public:
    Cat_List_Info( bool bDel ):bIsDelete( bDel ), iNum( 0 ), pCatList( NULL )
    {

    };
    ~Cat_List_Info()
    {
        if( bIsDelete && pCatList )
        {
            delete []pCatList;
            pCatList = NULL;
        }
    };
public:
    int iNum; //cats number
    PCAT_INFO pCatList; //list
private:
    bool bIsDelete;
};
//add leaf node
int AddLeafNode( TiXmlNode* pElmParent, const char* pszNode, const char* pszText )
{
    TiXmlElement elmNode(pszNode);
    TiXmlText elmText(pszText);
    XML_ASSERT( elmNode.InsertEndChild( elmText ) );
    XML_ASSERT( pElmParent->InsertEndChild( elmNode ) );
    return RET_OK;
}
//get leaf node
int GetLeafNode( TiXmlNode* pElmParent, char* pszNode, char* pszText )
{
    TiXmlNode *pTemp;
    if ( pElmParent && ( pTemp = pElmParent->FirstChild( pszNode ) ) )
    {
        if ( pTemp = pTemp->FirstChild() )
        {
            strcpy( pszText, pTemp->Value() );
            return RET_OK;
        }
    }
    return RET_ERR;
}
int WriteXmlToFile( IN Cat_List_Info *pCats )
{
    TiXmlDeclaration Declaration( "1.0","", "" );
    TiXmlDocument xmlDoc( XML_STR_FILE );
    xmlDoc.InsertEndChild( Declaration );
    TiXmlElement elmRoot( XML_STR_ROOT );
    char szBuf[BUF_SIZE];
    szBuf[0] = '/0';
    if ( !pCats )
    {
        return RET_ERR;
    }
    if ( pCats->iNum > 0)
    {
        //num
        sprintf( szBuf,"%d", pCats->iNum );
        XML_RETURN( AddLeafNode( &elmRoot, XML_STR_CAT_NUM, szBuf ) );
    }
    else
    {
        return RET_ERR;
    }
    for ( int i = 0; i < pCats->iNum; i++ )
    {
        TiXmlElement elmCat( XML_STR_CAT_INFO );
        //name
        if ( '/0' != pCats->pCatList[i].szName[0] )
        {
            XML_RETURN( AddLeafNode( &elmCat, XML_STR_CAT_NAME, pCats->pCatList[i].szName ) );
        }
        //age
        sprintf( szBuf,"%d", pCats->pCatList[i].iAge );
        XML_RETURN( AddLeafNode( &elmCat, XML_STR_CAT_AGE, szBuf ) );
        //color
        if ( '/0' != pCats->pCatList[i].szColor[0] )
        {
            XML_RETURN( AddLeafNode( &elmCat, XML_STR_CAT_COLOR, pCats->pCatList[i].szColor ) );
        }
        XML_ASSERT( elmRoot.InsertEndChild( elmCat ) );
    }
    XML_ASSERT( xmlDoc.InsertEndChild( elmRoot ) );
    //save
    xmlDoc.SaveFile();
    return RET_OK;
}

int ReadXmlFromFile( OUT Cat_List_Info *pCats )
{
    TiXmlElement *pRootNode = NULL;
    TiXmlElement *pTemp = NULL;
    char szBuf[BUF_SIZE];
    szBuf[0] = '/0';
    if (!pCats)
    {
        return RET_ERR;
    }
    TiXmlDocument xmlDoc( XML_STR_FILE );
    if( !xmlDoc.LoadFile() )
        return RET_ERR;
    XML_ASSERT( pRootNode = xmlDoc.RootElement() );
    pTemp = pRootNode->FirstChildElement( XML_STR_CAT_NUM );
    if ( pTemp )
    {
        GetLeafNode( pRootNode, XML_STR_CAT_NUM, szBuf );
        pCats->iNum = atoi( szBuf );
    }
    if ( pCats->iNum > 0 )
    {
        TiXmlNode *pCat = NULL;
        pCat = pRootNode->FirstChild( XML_STR_CAT_INFO );
        if ( pCat )
        {
            for ( int i = 0; i < pCats->iNum; i++ )
            {
                //name
                GetLeafNode( pCat, XML_STR_CAT_NAME, pCats->pCatList[i].szName );
                //age
                GetLeafNode( pCat, XML_STR_CAT_AGE, szBuf );
                pCats->pCatList[i].iAge = atoi(szBuf);
                //color
                GetLeafNode( pCat, XML_STR_CAT_COLOR, pCats->pCatList[i].szColor );
                pCat = pCat->NextSibling();
            }
        }
    }
    else
    {
        return RET_ERR;
    }
    return RET_OK;
}
int main(int argc, char* argv[])
{
    Cat_List_Info cats(true);
    cats.iNum = 2;
    cats.pCatList = new CAT_INFO[cats.iNum];
    if ( NULL == cats.pCatList )
    {
        cout<<"no memory..."<<endl;
        return RET_ERR;
    }
    cats.pCatList[0].iAge = 5;
    strcpy( cats.pCatList[0].szColor, "white" );
    strcpy( cats.pCatList[0].szName, "Bob" );

    cats.pCatList[1].iAge = 6;
    strcpy( cats.pCatList[1].szColor, "black" );
    strcpy( cats.pCatList[1].szName, "Tom" );
    int iRet = WriteXmlToFile( &cats );

    iRet = ReadXmlFromFile( &cats );
    if ( RET_OK == iRet )
    {
        for ( int i = 0; i < cats.iNum; i++ )
        {
            cout<<i<<" cat's name is "<<cats.pCatList[i].szName<<endl;
            cout<<i<<" cat's age is "<<cats.pCatList[i].iAge<<endl;
            cout<<i<<" cat's color is "<<cats.pCatList[i].szColor<<endl;
        }
    }
    system( "pause" );
    return 0;
}

下边是生成的cat.xml文件

<?xml version="1.0" ?>
<xml-root>
    <num>2</num>
    <cat-info>
        <name>Bob</name>
        <age>5</age>
        <color>white</color>
    </cat-info>
    <cat-info>
        <name>Tom</name>
        <age>6</age>
        <color>black</color>
    </cat-info>
</xml-root>

从cat.xml文件读取节点元素，进行打印