c++ builder 中的 XMLDocument 类详解(4) - 攻取根目录下元素数

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



#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

    TXMLDocument *XMLDocument1;

    TButton *btn_1;

    TButton *btn_2;

    TButton *btn_3;

    void __fastcall FormCreate(TObject *Sender);

    void __fastcall btn_1Click(TObject *Sender);

    void __fastcall btn_2Click(TObject *Sender);

    void __fastcall btn_3Click(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)

{

    //打开

    XMLDocument1->LoadFromFile("D:\code\BCB\xml\test.xml");

}

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



void __fastcall TForm1::btn_1Click(TObject *Sender)

{

    //第一种方法

    ShowMessage(IntToStr(XMLDocument1->DocumentElement->ChildNodes->Count));

}

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

void __fastcall TForm1::btn_2Click(TObject *Sender)

{

    //第二种方法



    _di_IXMLNodeList nodeList;//定义一个节点列表对象



    //把根节点下面的结点赋值给节点列表对象

    nodeList=XMLDocument1->DocumentElement->ChildNodes;

    ShowMessage(IntToStr(nodeList->Count));

}

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void __fastcall TForm1::btn_3Click(TObject *Sender)

{

    //第三种方法



    _di_IXMLNode node;//定义一个节点对象

    _di_IXMLNodeList nodeList;//定义一个节点对象集



    //根节点也是一个节点, 把它赋给节点对象

    node=XMLDocument1->DocumentElement;

    nodeList=node->ChildNodes;

    ShowMessage(IntToStr(nodeList->Count));

}

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