计算机科学论坛--[原创]跪求：VC中tinyxml使用方法，哪位高手哥哥指教一下啊！

1.加载文件。
TiXmlDocument doc( "demo.xml" );
doc.LoadFile();
2.
void main(void)
{
TiXmlDocument doc("example1.xml");
bool loadOkay = doc.LoadFile();
if (loadOkay)
{
  printf("\n%s:\n", pFilename);
  dump_to_stdout( &doc ); // defined later in the tutorial
}
else
{
  printf("Failed to load file \"%s\"\n", pFilename);
}
return;
}
example1.xml 的内容如果是：
<?xml version="1.0" ?>
<Hello>World</Hello>
输出为：
DOCUMENT
+ DECLARATION
+ ELEMENT Hello
  + TEXT[World]
3.建立文档的方法.
void build( )
{               TiXmlDocument doc;
TiXmlDeclaration * decl = new TiXmlDeclaration( "1.0", "", "" );
TiXmlElement * element = new TiXmlElement( "Hello" );
TiXmlText * text = new TiXmlText( "World" );
element->LinkEndChild( text );
doc.LinkEndChild( decl );
doc.LinkEndChild( element );
doc.SaveFile( "example1.xml" );
}
4.设定节点属性。
TiXmlElement  window = new TiXmlElement( "Demo" );
window->SetAttribute("name", "Circle");
window->SetAttribute("x", 5);
window->SetAttribute("y", 15);
window->SetDoubleAttribute("radius", 3.14159);
5.获取元素的所有属性，并打印出属性名称和值
int printElement(TiXmlElement* pElement, unsigned int indent)
{
if ( !pElement ) return 0;

TiXmlAttribute* pAttrib=pElement->FirstAttribute();
int i=0;
int ival;
double dval;
const char* pIndent=getIndent(indent);
printf("\n");
while (pAttrib)
{
printf( "%s%s: value=[%s]", pIndent, pAttrib->Name(), pAttrib->Value());

if (pAttrib->QueryIntValue(&ival)==TIXML_SUCCESS)    printf( " int=%d", ival);
  if (pAttrib->QueryDoubleValue(&dval)==TIXML_SUCCESS) printf( " d=%1.1f", dval);
  printf( "\n" );
  i++;
  pAttrib=pAttrib->Next();
}
return i;
}
6.写入文件，其实上面已经用到了。
doc.SaveFile( saveFilename );
7.建立一个其内容如下的文档：
<?xml version="1.0" ?>
<MyApp>
    
    <Messages>
        <Welcome>Welcome to MyApp</Welcome>
        <Farewell>Thank you for using MyApp</Farewell>
    </Messages>
    <Windows>
        <Window name="MainFrame" x="5" y="15" w="400" h="250" />
    </Windows>
    <Connection ip="192.168.0.1" timeout="123.456000" />
</MyApp>

void main( )
{
TiXmlDocument doc;
TiXmlElement* msg;
TiXmlDeclaration* decl = new TiXmlDeclaration( "1.0", "", "" );  //文档声明
doc.LinkEndChild( decl );

TiXmlElement * root = new TiXmlElement( "MyApp" );
doc.LinkEndChild( root );  //根元素

TiXmlComment * comment = new TiXmlComment();//xml注释
comment->SetValue(" Settings for MyApp " );
root->LinkEndChild( comment );  //插入根元素之间
TiXmlElement * msgs = new TiXmlElement( "Messages" );
root->LinkEndChild( msgs );  //定义元素Messages，插入到root

msg = new TiXmlElement( "Welcome" );  //定义新元素，并插入到msgs
msg->LinkEndChild( new TiXmlText( "Welcome to MyApp" ));
msgs->LinkEndChild( msg );

msg = new TiXmlElement( "Farewell" );  //定义新元素，并插入到msgs
msg->LinkEndChild( new TiXmlText( "Thank you for using MyApp" ));
msgs->LinkEndChild( msg );

TiXmlElement * windows = new TiXmlElement( "Windows" );
root->LinkEndChild( windows );  //root中插入新元素windows

TiXmlElement * window;
window = new TiXmlElement( "Window" );
windows->LinkEndChild( window ); //定义新元素，并设定其属性。
window->SetAttribute("name", "MainFrame");
window->SetAttribute("x", 5);
window->SetAttribute("y", 15);
window->SetAttribute("w", 400);
window->SetAttribute("h", 250);

TiXmlElement * cxn = new TiXmlElement( "Connection" );
root->LinkEndChild( cxn );
cxn->SetAttribute("ip", "192.168.0.1");
cxn->SetDoubleAttribute("timeout", 123.456); // floating point attrib

dump_to_stdout( &doc );
doc.SaveFile( "appsettings.xml" );  //保存文件
}
8.对象到XML的转换。
///class
#include <string>
#include <map>
using namespace std;

typedef std::map<std::string,std::string> MessageMap;

// a basic window abstraction - demo purposes only
class WindowSettings
{
public:
int x,y,w,h;
string name;

WindowSettings()
: x(0), y(0), w(100), h(100), name("Untitled")
{
}

WindowSettings(int x, int y, int w, int h, const string& name)
{
  this->x=x;
  this->y=y;
  this->w=w;
  this->h=h;
  this->name=name;
}
};

class ConnectionSettings
{
public:
string ip;
double timeout;
};

class AppSettings
{
public:
string m_name;
MessageMap m_messages;
list<WindowSettings> m_windows;
ConnectionSettings m_connection;

AppSettings() {}

void save(const char* pFilename);
void load(const char* pFilename);

// just to show how to do it
void setDemoValues()
{
  m_name="MyApp";
  m_messages.clear();
  m_messages["Welcome"]="Welcome to "+m_name;
  m_messages["Farewell"]="Thank you for using "+m_name;
  m_windows.clear();
  m_windows.push_back(WindowSettings(15,15,400,250,"Main"));
  m_connection.ip="Unknown";
  m_connection.timeout=123.456;
}
};
///创建文件，并加载
int main(void)
{
AppSettings settings;

settings.save("appsettings2.xml");
settings.load("appsettings2.xml");
return 0;
}
///创建，修改和保存
int main(void)
{
// block: customise and save settings
{
  AppSettings settings;
  settings.m_name="HitchHikerApp";
  settings.m_messages["Welcome"]="Don't Panic";
  settings.m_messages["Farewell"]="Thanks for all the fish";
  settings.m_windows.push_back(WindowSettings(15,25,300,250,"BookFrame"));
  settings.m_connection.ip="192.168.0.77";
  settings.m_connection.timeout=42.0;

  settings.save("appsettings2.xml");
}

// block: load settings
{
  AppSettings settings;
  settings.load("appsettings2.xml");
  printf("%s: %s\n", settings.m_name.c_str(),
   settings.m_messages["Welcome"].c_str());
  WindowSettings & w=settings.m_windows.front();
  printf("%s: Show window '%s' at %d,%d (%d x %d)\n",
   settings.m_name.c_str(), w.name.c_str(), w.x, w.y, w.w, w.h);
  printf("%s: %s\n", settings.m_name.c_str(), settings.m_messages["Farewell"].c_str());
}
return 0;
}
输出：
HitchHikerApp: Don't Panic
HitchHikerApp: Show window 'BookFrame' at 15,25 (300 x 100)
HitchHikerApp: Thanks for all the fish
9.XML到对象的转换。
void AppSettings::load(const char* pFilename)
{
TiXmlDocument doc(pFilename);
if (!doc.LoadFile()) return;

TiXmlHandle hDoc(&doc);
TiXmlElement* pElem;
TiXmlHandle hRoot(0);

// block: name
{
  pElem=hDoc.FirstChildElement().Element();
  // should always have a valid root but handle gracefully if it does
  if (!pElem) return;
  m_name=pElem->Value();

// save this for later
hRoot=TiXmlHandle(pElem);
}

// block: string table
{
m_messages.clear(); // trash existing table

  pElem=hRoot.FirstChild( "Messages" ).FirstChild().Element();
  for( pElem; pElem; pElem=pElem->NextSiblingElement())
  {
   const char *pKey=pElem->Value();
   const char *pText=pElem->GetText();
   if (pKey && pText)
   {
    m_messages[pKey]=pText;
   }
  }
}

// block: windows
{
m_windows.clear(); // trash existing list

  TiXmlElement* pWindowNode=hRoot.FirstChild( "Windows" ).FirstChild().Element();
  for( pWindowNode; pWindowNode; pWindowNode=pWindowNode->NextSiblingElement())
  {
   WindowSettings w;
   const char *pName=pWindowNode->Attribute("name");
   if (pName) w.name=pName;

   pWindowNode->QueryIntAttribute("x", &w.x); // If this fails, original value is left

as-is
   pWindowNode->QueryIntAttribute("y", &w.y);
   pWindowNode->QueryIntAttribute("w", &w.w);
   pWindowNode->QueryIntAttribute("hh", &w.h);

m_windows.push_back(w);
}
}

// block: connection
{
  pElem=hRoot.FirstChild("Connection").Element();
  if (pElem)
  {
   m_connection.ip=pElem->Attribute("ip");
   pElem->QueryDoubleAttribute("timeout",&m_connection.timeout);
  }
}
}

10.一个比较完整的例子，加载任意的XML文档，并在控制台上输出。
//
#include "stdafx.h"
#include "tinyxml.h"

// ----------------------------------------------------------------------
// STDOUT dump and indenting utility functions
// ----------------------------------------------------------------------
const unsigned int NUM_INDENTS_PER_SPACE=2;

const char * getIndent( unsigned int numIndents )
{
static const char * pINDENT=" + ";
static const unsigned int LENGTH=strlen( pINDENT );
unsigned int n=numIndents*NUM_INDENTS_PER_SPACE;
if ( n > LENGTH ) n = LENGTH;

return &pINDENT[ LENGTH-n ];
}

// same as getIndent but no "+" at the end
const char * getIndentAlt( unsigned int numIndents )
{
static const char * pINDENT=" ";
static const unsigned int LENGTH=strlen( pINDENT );
unsigned int n=numIndents*NUM_INDENTS_PER_SPACE;
if ( n > LENGTH ) n = LENGTH;

return &pINDENT[ LENGTH-n ];
}

int dump_attribs_to_stdout(TiXmlElement* pElement, unsigned int indent)
{
if ( !pElement ) return 0;

void dump_to_stdout( TiXmlNode* pParent, unsigned int indent = 0 )
{
if ( !pParent ) return;

TiXmlNode* pChild;
TiXmlText* pText;
int t = pParent->Type();
printf( "%s", getIndent(indent));
int num;

switch ( t )
{
case TiXmlNode::DOCUMENT:
printf( "Document" );
break;

case TiXmlNode::ELEMENT:
  printf( "Element [%s]", pParent->Value() );
  num=dump_attribs_to_stdout(pParent->ToElement(), indent+1);
  switch(num)
  {
   case 0:  printf( " (No attributes)"); break;
   case 1:  printf( "%s1 attribute", getIndentAlt(indent)); break;
   default: printf( "%s%d attributes", getIndentAlt(indent), num); break;
  }
  break;

case TiXmlNode::COMMENT:
printf( "Comment: [%s]", pParent->Value());
break;

case TiXmlNode::UNKNOWN:
printf( "Unknown" );
break;

case TiXmlNode::TEXT:
  pText = pParent->ToText();
  printf( "Text: [%s]", pText->Value() );
  break;

case TiXmlNode::DECLARATION:
  printf( "Declaration" );
  break;
default:
  break;
}
printf( "\n" );
for ( pChild = pParent->FirstChild(); pChild != 0; pChild = pChild->NextSibling())
{
  dump_to_stdout( pChild, indent+1 );
}
}

// load the named file and dump its structure to STDOUT
void dump_to_stdout(const char* pFilename)
{
TiXmlDocument doc(pFilename);
bool loadOkay = doc.LoadFile();
if (loadOkay)
{
  printf("\n%s:\n", pFilename);
  dump_to_stdout( &doc ); // defined later in the tutorial
}
else
{
  printf("Failed to load file \"%s\"\n", pFilename);
}
}

// ----------------------------------------------------------------------
// main() for printing files named on the command line
// ----------------------------------------------------------------------
int main(int argc, char* argv[])
{
for (int i=1; i<argc; i++)
{
dump_to_stdout(argv[i]);
}
return 0;
}


	W 3 C h i n a ( since 2003 ) 旗下站点苏ICP备05006046号《全国人大常委会关于维护互联网安全的决定》《计算机信息网络国际联网安全保护管理办法》	100.586ms