Linux 下读XML 的类详解及实现代码

 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 (www.mergesoft.com)-->
<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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