Ваша проблема заключается в том, что событие OnDocumentComplete будет запущено для КАЖДОГО набора фреймов + верхнего документа. Вот пример кода, как правильно реализовать это событие:
procedure TFrm_browser.BrowserDocumentComplete(ASender: TObject; const pDisp: IDispatch; var URL: OleVariant);
var CurrentBrowser: IWebBrowser2;
TopBrowser: IWebBrowser2;
Doc : IHTMLDocument2;
begin
CurrentBrowser := pDisp as IWebBrowser2;
TopBrowser := (ASender as TWebbrowser).DefaultInterface;
if Assigned(CurrentBrowser) and Assigned(TopBrowser) then
begin
Doc := CurrentBrowser.Document as IHTMLDocument2;
if CurrentBrowser = TopBrowser then
begin
if Assigned(FOnCompleteDocLoaded) then
FOnCompleteDocLoaded(Self, Doc);
end
else
begin
if Assigned(FOnFrameSetLoaded) then
FOnFrameSetLoaded(Self, Doc);
end;
end;
end;
Вы должны обработать каждый набор фреймов и верхний документ.
EDIT
Поскольку в ОП нет подсказки, я создал небольшой тестовый проект:
unit Unit4;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, OleCtrls, SHDocVw, StdCtrls, Mshtml;
type
TForm1 = class(TForm)
WebBrowser1: TWebBrowser;
Memo1: TMemo;
procedure FormCreate(Sender: TObject);
procedure WebBrowser1DocumentComplete(ASender: TObject; const pDisp: IDispatch; var URL: OleVariant);
private
{ Private declarations }
procedure GetH3Tags(Doc : IHTMLDocument2);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
WebBrowser1.Navigate('http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_frame_cols');
end;
procedure TForm1.GetH3Tags(Doc: IHTMLDocument2);
var Elements: IHTMLElementCollection;
Element : IHTMLElement;
Index : Integer;
begin
Elements := Doc.all.tags('h3') as IHTMLElementCollection;
Index := Elements.length;
while Index > 0 do
begin
Dec(Index);
Element := Elements.item(Index, '') as IHTMLElement;
Memo1.Lines.Add(Element.innerText);
end;
end;
procedure TForm1.WebBrowser1DocumentComplete(ASender: TObject; const pDisp: IDispatch; var URL: OleVariant);
var CurrentBrowser: IWebBrowser2;
TopBrowser: IWebBrowser2;
Doc : IHTMLDocument2;
begin
CurrentBrowser := pDisp as IWebBrowser2;
TopBrowser := (ASender as TWebbrowser).DefaultInterface;
if Assigned(CurrentBrowser) and Assigned(TopBrowser) then
begin
Doc := CurrentBrowser.Document as IHTMLDocument2;
if CurrentBrowser = TopBrowser then
begin
// get tags for top level document
GetH3Tags(Doc);
end
else
begin
// get tags for each frameset
GetH3Tags(Doc);
end;
end;
end;
end.
Файл DFM:
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 427
ClientWidth = 899
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
PixelsPerInch = 96
TextHeight = 13
object WebBrowser1: TWebBrowser
Left = 209
Top = 0
Width = 690
Height = 427
Align = alClient
TabOrder = 0
OnDocumentComplete = WebBrowser1DocumentComplete
ExplicitLeft = 56
ExplicitTop = 24
ExplicitWidth = 300
ExplicitHeight = 150
ControlData = {
4C00000050470000222C00000000000000000000000000000000000000000000
000000004C000000000000000000000001000000E0D057007335CF11AE690800
2B2E126208000000000000004C0000000114020000000000C000000000000046
8000000000000000000000000000000000000000000000000000000000000000
00000000000000000100000000000000000000000000000000000000}
end
object Memo1: TMemo
Left = 0
Top = 0
Width = 209
Height = 427
Align = alLeft
Color = clHighlight
TabOrder = 1
end
end
Этот образец получит все теги H3 с этой страницы:
http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_frame_cols
@ Tlama: это хороший пример, когда OnDocumentcomplete будет срабатывать несколько раз.