如何用tinyxml 库创建并读写xml代码截取

因为自己每次写完之后都忘记了  然后又要从别的地方学习再重新写  还不如记录再这里

//创建
        TiXmlDocument *pXmlDocument = new TiXmlDocument(m_strFilePath.c_str());//
        TiXmlDeclaration *pDeclaretion = new TiXmlDeclaration("1.0", "UTF-8","");//创建xml声明
        pXmlDocument->LinkEndChild(pDeclaretion);
        TiXmlElement *pXmlElement = new TiXmlElement("Symbol");
        pXmlDocument->LinkEndChild(pXmlElement);    
        pXmlDocument->SaveFile(m_strFilePath.c_str());

//读
TiXmlDocument *pXmlDoc = new TiXmlDocument();
    pXmlDoc->LoadFile(strFilePath.c_str());

    TiXmlElement *pRootElement = pXmlDoc->RootElement(); 
    if (pRootElement == NULL)
    {
        return;
    }
    // 第一个子节点  
    TiXmlElement *pSignNode = pRootElement->FirstChildElement("sign"); 
    if (!pSignNode)
    {
        SAFE_DELETE(pSignNode);
        return;
    }
    while (pSignNode != NULL)
    {
        CMapSingleParameter *pMapSingleParameter = new CMapSingleParameter();
        if (!pMapSingleParameter)
        {
            SAFE_DELETE(pMapSingleParameter);
            return ;
        }
        // text
        TCHAR tcharValue[MAX_PATH * 4] = {_T('\0')};

        // name
        const CHAR *pszName = pSignNode->Attribute("name");
        if (pszName != NULL)
        {
            CommonUtil::UTF8ToTCHAR(pszName,tcharValue);
            pMapSingleParameter->AppendParameter(_T("name"), tcharValue);
        }
        
        // height
        const CHAR *pszHeight = pSignNode->Attribute("height");
        if (pszHeight != NULL)
        {
            CommonUtil::UTF8ToTCHAR(pszHeight,tcharValue);
            pMapSingleParameter->AppendParameter(_T("height"), tcharValue);
        }
        //Content
        const CHAR *pszContent = pSignNode->GetText();
        if (pszContent != NULL)
        {
            CommonUtil::UTF8ToTCHAR(pszContent,tcharValue);
            pMapSingleParameter->AppendParameter(_T("content"), tcharValue);
        }

        m_pLatelyVectorSymbol->push_back(pMapSingleParameter);        
        pSignNode = pSignNode->NextSiblingElement();            
    }    



//写
string strFile = m_strFilePath;
    
    //创建文档对象
    TiXmlDocument myXmlDocument;
    //加载文件数据 
    myXmlDocument.LoadFile(strFile.c_str());

    TiXmlElement *pRootElement = myXmlDocument.RootElement(); 
    if (pRootElement == NULL)
    {
        return ;
    }

    if (pRootElement != NULL)
    {
        TiXmlElement *pFirstNode = pRootElement->FirstChildElement("sign");
        if (pFirstNode == NULL)
        {    
            int nSignPos = 0;

            for (TVectorSymbol::iterator ite = m_pLatelyVectorSymbol->begin(); ite != m_pLatelyVectorSymbol->end(); ++ite)
            {
                CMapSingleParameter *pMapSingleParameter = *ite;
                TiXmlElement *insertElement = new TiXmlElement("sign");
                pRootElement->LinkEndChild(insertElement);
                xstring strUnicode = pMapSingleParameter->GetParameterValue(_T("name"));
                TCHAR tcharValue[MAX_PATH*4]= {_T('\0')};
                _tcscpy(tcharValue, strUnicode.c_str());
                char chUtf8[MAX_PATH*4] = {'\0'};
                CommonUtil::TCHARToUTF8(tcharValue, chUtf8);
                insertElement->SetAttribute("name",chUtf8);


                strUnicode = pMapSingleParameter->GetParameterValue(_T("height"));
                _tcscpy(tcharValue, strUnicode.c_str());
                CommonUtil::TCHARToUTF8(tcharValue, chUtf8);
                insertElement->SetAttribute("height",chUtf8);

                strUnicode = pMapSingleParameter->GetParameterValue(_T("content"));
                _tcscpy(tcharValue, strUnicode.c_str());
                CommonUtil::TCHARToUTF8(tcharValue, chUtf8);
                
                TiXmlText *pXmlText = new TiXmlText(chUtf8);
                pXmlText->SetCDATA(true);//添加格式化<![CDATA[]]>
                
                insertElement->LinkEndChild(pXmlText);

                m_nLatelyTotal ++;    
            }        
        }            
    }    
    myXmlDocument.SaveFile(strFile.c_str());
}


//删除节点

    string strFile = m_strFilePath;

    //创建文档对象
    TiXmlDocument myXmlDocument;
    //加载文件数据 
    myXmlDocument.LoadFile(strFile.c_str());

    TiXmlElement *pRootElement = myXmlDocument.RootElement(); 
    if (pRootElement == NULL)
    {
        return ;
    }

    TiXmlElement *pSignNode = pRootElement->FirstChildElement("sign");
    while (pSignNode != NULL)
    {
        m_nLatelyTotal --;
        TiXmlElement *pSignRemoveNode = pSignNode;
        pSignNode= pSignNode->NextSiblingElement("sign");
        pRootElement->RemoveChild(pSignRemoveNode);        
    }

    myXmlDocument.SaveFile(strFile.c_str());