Linux 下读XML 的类详解及实现代码

在Linux下写程序，常需要读一些配置文件。现有的XML工具很多，可以方便的编辑和生成XML。

但VC中用的XML解析器在Linux下不能用。只好自已写了个。用了一下，还不错。

#include <stdio.h>#include <stdlib.h>// ********************************************************************** //// XML解析类(honghaier写于2008-11-19)// ********************************************************************** //struct SXMLAttrib{ char mKeyName[100]; //键名 char mValue[100]; //键值}; struct SXMLFrame{public: char mFrameName[100]; //帧名 int mAttrNum; //属性数量 SXMLAttrib* mAttrArray; //属性数组 SXMLFrame* mpSiblFrame; //兄弟结点 SXMLFrame* mpChiFrame; //子结点 SXMLFrame* mpParentFrame; //父结点public: SXMLFrame(); ~SXMLFrame(); void Release_Depath(); SXMLFrame* GetFrame_Depth(char *szFrameName); int GetChildNum(); SXMLFrame* GetChildFrame(int Index); SXMLFrame* GetChildFrame(char *szFrameName); SXMLFrame* GetSiblFrame(); SXMLFrame* GetParentFrame(); SXMLAttrib* GetAttrib(char *szKeyName); bool ParseAttrString(char *szXMLString);};class CXMLFile{ SXMLFrame mRoot; SXMLFrame* mpCurrentFrame; bool mbDepthClose; //闭合private: bool ParseFrameString(char *szXMLString);public: int pFile; CXMLFile(); ~CXMLFile(); void Close(); void Release(); bool Open( const char * pFileName); SXMLFrame* GetRoot(); SXMLFrame* GetFrame_Depth(char *szFrameName); }; //====================================================SXMLFrame::SXMLFrame(){ memset(mFrameName,0,sizeof(mFrameName)); mAttrNum = 0; mAttrArray = NULL; mpSiblFrame = NULL; mpChiFrame = NULL; mpParentFrame = NULL;}SXMLFrame::~SXMLFrame(){ Release_Depath();}void SXMLFrame::Release_Depath(){ if(mAttrNum > 0) { if(mAttrArray) { delete[] mAttrArray; mAttrArray = NULL; } mAttrNum = 0; } if(mpChiFrame) { mpChiFrame->Release_Depath(); delete mpChiFrame; mpChiFrame = NULL; } if(mpSiblFrame) { mpSiblFrame->Release_Depath(); delete mpSiblFrame; mpSiblFrame = NULL; }}SXMLFrame* SXMLFrame::GetFrame_Depth(char *szFrameName){ if(strcmp(mFrameName,szFrameName)==0) { return this; } if(mpChiFrame) { SXMLFrame* tResFrame = mpChiFrame->GetFrame_Depth(szFrameName); if(tResFrame)return tResFrame; } if(mpSiblFrame) { SXMLFrame* tResFrame = mpSiblFrame->GetFrame_Depth(szFrameName); if(tResFrame)return tResFrame; } return NULL;}int SXMLFrame::GetChildNum(){ int count = 0; for(SXMLFrame *temp = mpChiFrame ; temp != NULL ;temp = temp->mpSiblFrame) { count++; } return count;}SXMLFrame* SXMLFrame::GetChildFrame(int Index){ int count = 0; for(SXMLFrame *temp = mpChiFrame ; temp != NULL ;temp = temp->mpSiblFrame) { if(count == Index)return temp; count++; } return NULL;}SXMLFrame* SXMLFrame::GetChildFrame(char *szFrameName){ for(SXMLFrame *temp = mpChiFrame ; temp != NULL ;temp = temp->mpSiblFrame) { if(strcmp(temp->mFrameName,szFrameName)==0) { return temp; } } return NULL;}SXMLFrame* SXMLFrame::GetSiblFrame(){ return mpSiblFrame;}SXMLFrame* SXMLFrame::GetParentFrame(){ return mpParentFrame;}SXMLAttrib* SXMLFrame::GetAttrib(char *szKeyName){ for(int i = 0 ; i < mAttrNum ; i++) { if(strcmp(mAttrArray[i].mKeyName,szKeyName)==0) { return &mAttrArray[i]; } } return NULL;}bool SXMLFrame::ParseAttrString(char *szXMLString){ SXMLAttrib AttribArray[100]; int len = strlen(szXMLString); mAttrNum = 0; int StrPos = 0; bool HaveFrameName = false; for(int i = 0 ;i < len ; i++) { if(i==(len-1)) { if(false == HaveFrameName) { memcpy(mFrameName,szXMLString,len); mFrameName[len]='/0'; HaveFrameName = true; } else { if(( len - StrPos-1 )== 0) { memset(AttribArray[mAttrNum].mValue,0,sizeof(AttribArray[mAttrNum].mValue)); } else { memcpy(AttribArray[mAttrNum].mValue,szXMLString+StrPos,len-StrPos-1); AttribArray[mAttrNum].mValue[len-StrPos-1]='/0'; } mAttrNum++; StrPos = 0; } break; } if(szXMLString[i] == ' '&&szXMLString[i-1] == ' ') { StrPos = i+1; continue; } if(szXMLString[i] == ' ') { if(false == HaveFrameName) { memcpy(mFrameName,szXMLString,i); mFrameName[i]='/0'; HaveFrameName = true; StrPos = i+1; continue; } else { if(( i - StrPos-1 )== 0) { memset(AttribArray[mAttrNum].mValue,0,sizeof(AttribArray[mAttrNum].mValue)); } else { memcpy(AttribArray[mAttrNum].mValue,szXMLString+StrPos,i-StrPos-1); AttribArray[mAttrNum].mValue[i-StrPos-1]='/0'; } mAttrNum++; StrPos = i+1; continue; } } if(szXMLString[i] == '=') { memcpy(AttribArray[mAttrNum].mKeyName,szXMLString+StrPos,i-StrPos); AttribArray[mAttrNum].mKeyName[i-StrPos]='/0'; i++;//跳过一个""" StrPos = i+1; continue; } } mAttrArray = new SXMLAttrib[mAttrNum]; if(!mAttrArray)return false; memcpy(mAttrArray,AttribArray,mAttrNum*sizeof(SXMLAttrib)); return true;}CXMLFile::CXMLFile(){ pFile = 0; mpCurrentFrame = NULL; mbDepthClose = false;}CXMLFile::~CXMLFile(){ Close();}void CXMLFile::Close(){ if( pFile>0) { int error = close( pFile); if( error!=0) { perror("close file failed"); }else { pFile=-1; } Release(); }}void CXMLFile::Release(){ mRoot.Release_Depath();}bool CXMLFile::Open( const char * pFileName){ pFile =0; pFile = open( pFileName,O_RDONLY); if( pFile==-1) { perror(pFileName); return false; } int num = 0; char buffer; bool bReadXMLString = false; int XMLStringNum = 0; char XMLString[1024]; while(num = read(pFile,&buffer,1)>0) { if(buffer =='<') { bReadXMLString = true; XMLStringNum = 0; continue; } if(buffer == '>') { XMLString[XMLStringNum]='/0'; if( false == ParseFrameString(XMLString)) { printf("Read XML error: %s /n",XMLString); return false; } bReadXMLString = false; continue; } if(true == bReadXMLString) { XMLString[XMLStringNum++] = buffer; } } mpCurrentFrame = NULL; mbDepthClose = true; return true;}SXMLFrame* CXMLFile::GetRoot(){ return &mRoot;}SXMLFrame* CXMLFile::GetFrame_Depth(char *szFrameName){ return mRoot.GetFrame_Depth(szFrameName);}bool CXMLFile::ParseFrameString(char *szXMLString){ if(szXMLString[0] == '?')return true; if(szXMLString[0] == '!')return true; if(szXMLString[0] == '/') { //如果是结束 mpCurrentFrame = mpCurrentFrame->GetParentFrame(); mbDepthClose = true; } else { mbDepthClose = false; if( NULL == mpCurrentFrame) { mpCurrentFrame = &mRoot; } SXMLFrame* tNewFrame = new SXMLFrame; tNewFrame->ParseAttrString(szXMLString); if(false == mbDepthClose) { tNewFrame->mpParentFrame = mpCurrentFrame; if( NULL == mpCurrentFrame->mpChiFrame) { mpCurrentFrame->mpChiFrame = tNewFrame; } else { for(SXMLFrame *temp = mpCurrentFrame->mpChiFrame ; temp != NULL ;temp = temp->mpSiblFrame) { if( NULL == temp->mpSiblFrame) { temp->mpSiblFrame = tNewFrame; break; } } } mpCurrentFrame = tNewFrame; } else { tNewFrame->mpParentFrame = mpCurrentFrame->GetParentFrame(); mpCurrentFrame->mpSiblFrame = tNewFrame; mpCurrentFrame = tNewFrame; } } return true;}

用XML工具做了一个简单的XML文件。

<?xml version="1.0" encoding="UTF-8"?><!-- edited with XML Explorer v2.0 by Mergesoft ()--><root> <Honghaier Name="红孩儿" Age="26"></Honghaier></root>

在C++代码中

可以这样使用

CXMLFile xmlfile;xmlfile.Open("1.xml");SXMLFrame* mRootFrame = CXMLFile::GetRoot();int ChildNum = mRootFrame ->GetChildNum(); for(int i = 0 ; i < ChildNum ; i++){ SXMLFrame* tChileFrame = mRootFrame ->GetChildFrame (i); SXMLAttrib* tAttrib = tChileFrame->GetAttrib("Age"); print("%s : %s= %s /n",mChileFrame ->mFrameName,tAttrib->mKeyName,tAttrib->mValue);}

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