c++ builder 中的 XMLDocument 类详解(12) -关于 XML 属性

//---------------------------------------------------------------------------

#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <msxmldom.hpp>
#include <XMLDoc.hpp>
#include <xmldom.hpp>
#include <XMLIntf.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:	// IDE-managed Components
    TButton *btn_1;
    TButton *btn_2;
    TButton *btn_3;
    TButton *btn_4;
    TButton *btn_5;
    TXMLDocument *XMLDocument1;
    TMemo *Memo1;
    void __fastcall FormCreate(TObject *Sender);
    void __fastcall btn_1Click(TObject *Sender);
    void __fastcall btn_2Click(TObject *Sender);
    void __fastcall btn_3Click(TObject *Sender);
    void __fastcall btn_4Click(TObject *Sender);
    void __fastcall btn_5Click(TObject *Sender);
private:	// User declarations
public:		// User declarations
    __fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormCreate(TObject *Sender)
{
    XMLDocument1->LoadFromFile("D:\\code\\B_C_B\\XMLDocument\\test.xml");
}
//---------------------------------------------------------------------------

void __fastcall TForm1::btn_1Click(TObject *Sender)
{
// XMLDocument1对象的XML属性
    //u前面我们经常用这句代码，因为lines与xml同属于 TStrings
    Memo1->Lines= XMLDocument1->XML;

    //如果不怕麻烦，可以这样写
    Memo1->Lines->Text=XMLDocument1->XML->Text;

    //如果知道了这一点，那xml属性的功能可就多了，并且这里的xl属性是可写的
    //不过这里要谈的是结点的xml属性
}
//---------------------------------------------------------------------------

void __fastcall TForm1::btn_2Click(TObject *Sender)
{
    //根节点的xml属性

    _di_IXMLNode node;
    node=XMLDocument1->DocumentElement;

    //这句话有误，是因为XML是WideString类型
//    Memo1->Lines=node->XML;

    //所以应该写成这样
    Memo1->Lines->Text=node->XML;

    //还有一个更大的区别，节点的xml是只读的
}
//---------------------------------------------------------------------------
void __fastcall TForm1::btn_3Click(TObject *Sender)
{
    //子节点的xml属性

    _di_IXMLNode node;
    node=XMLDocument1->DocumentElement->ChildNodes->Nodes[0];

    Memo1->Lines->Text=node->XML;//会显示一个子结点的全部
}
//---------------------------------------------------------------------------
void __fastcall TForm1::btn_4Click(TObject *Sender)
{
    //属性的xml属性
    _di_IXMLNode node;

    node=XMLDocument1->DocumentElement;
    node=node->AttributeNodes->Nodes[0];
    ShowMessage(node->NodeName);//备注
    ShowMessage(node->NodeValue);//测试

    //用xml属性一次把他们都读出来
    ShowMessage(node->XML);

}
//---------------------------------------------------------------------------
void __fastcall TForm1::btn_5Click(TObject *Sender)
{
    //叶节点的xml属性
    _di_IXMLNode node;
    node=XMLDocument1->DocumentElement;
    node=node->ChildNodes->Nodes[0];
    node=node->ChildNodes->Nodes[0];
    node=node->ChildNodes->Nodes[0];//这就是叶节点

    ShowMessage(node->XML);
    //这时的xml属性和text属性一样了
    ShowMessage(node->Text);
}
//---------------------------------------------------------------------------