Linux read the XML class explanation and implementation code below

Read the XML class explanation and implementation code below Linux

To write a program under Linux, you often need to read some configuration files. There are many existing XML tools that make it easy to edit and generate XML.

However, the XML parser used in VC does not work under Linux. I had to write it myself. I used 1. That's not bad.

 #include <stdio.h>
#include <stdlib.h>


// ********************************************************************** //
// XML Parsing class (honghaier Written in 2008-11-19)
// ********************************************************************** //


struct SXMLAttrib
{
 char mKeyName[100]; // Key name 
 char mValue[100]; // The key value 
}
;

 


struct SXMLFrame
{
public:
 char mFrameName[100]; // The frame of 
 int  mAttrNum;  // Number of attributes 
 SXMLAttrib* mAttrArray;  // Attribute array 

 SXMLFrame* mpSiblFrame; // Brother nodes 
 SXMLFrame* mpChiFrame;  // The child node 
 SXMLFrame* mpParentFrame; // The parent node 
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; // closed 
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++;// skip 1 a """
  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] == '/')
 {
 // If it's the end 
 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;
}

Made a simple XML file with the XML tool.

 

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

 

 

In the C++ code

You can use it like this

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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