xml操作C++表述

VC中tinyxml使用方法简介

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：

World

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：

Welcome to MyApp

Thank you for using 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