利用WebBrowser读取网页中表格的数据（已有大部分代码，但读取失败）
比如这样一个网页：
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<table class="zhangdan_table" width="100%">
<tbody>
<tr class="table_top">
<td width="16%">编号</td>
<td width="19%">班别</td>
<td width="10%">年龄 </td>
<td width="25%">姓名 </td>
<td width="30%">出生年月 </td>
</tr>
<tr class="table_li">
<td><b>001</b> </td>
<td>一（1）</td>
<td><span>￥20</span> </td>
<td>小明</td>
<td>2000-08-01 </td>
</tr>
</tbody>
</table>
</body>
</html>
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, MSHTML, StdCtrls, OleCtrls, SHDocVw;
type
TForm1 = class(TForm)
Button1: TButton;
WebBrowser1: TWebBrowser;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
function GetHtmlTableCell(aTable: IHTMLTable; aRow, aCol: Integer): IHTMLElement;
var
Row: IHTMLTableRow;
begin
Result := nil;
if aTable = nil then Exit;
if aTable.rows = nil then Exit;
Row := aTable.rows.item(aRow, aRow) as IHTMLTableRow;
if Row = nil then Exit;
Result := Row.cells.item(aCol, aCol) as IHTMLElement;
end;
function GetHtmlTable(aDoc: IHTMLDocument2; aIndex: Integer): IHTMLTable;
var
list: IHTMLElementCollection;
begin
Result := nil;
if aDoc = nil then Exit;
if aDoc.all = nil then Exit;
list := aDoc.all.tags('table ') as IHTMLElementCollection;
if list = nil then Exit;
Result := list.item(aIndex, aIndex) as IHTMLTable;
end;
function GetWebBrowserHtmlTableCellText(const AWebBrowser: TWebBrowser;
const TableIndex, RowIndex, ColIndex: Integer;
var ResValue: string): Boolean;
var
Docintf: IHTMLDocument2;
tblintf: IHTMLTable;
node: IHTMLElement;
begin
ResValue := ' ';
docintf := AWebBrowser.Document as IHTMLDocument2;
tblintf := GetHtmlTable(docintf, TableIndex);
node := GetHtmlTableCell(tblintf, RowIndex, ColIndex);
Result := node <> nil;
if Result then
ResValue := Trim(node.innerText);
end;
function GetHtmlTableRowHtml(aTable: IHTMLTable; aRow: Integer): IHTMLElement;
var
Row: IHTMLTableRow;
begin
Result := nil;
if aTable = nil then Exit;
if aTable.rows = nil then Exit;
Row := aTable.rows.item(aRow, aRow) as IHTMLTableRow;
if Row = nil then Exit;
Result := Row as IHTMLElement;
end;
function GetWebBrowserHtmlTableCellHtml(const AWebBrowser: TWebBrowser;
const TableIndex, RowIndex, ColIndex: Integer;
var ResValue: string): Boolean;
var
Docintf: IHTMLDocument2;
tblintf: IHTMLTable;
node: IHTMLElement;
begin
ResValue := ' ';
docintf := AWebBrowser.Document as IHTMLDocument2;
tblintf := GetHtmlTable(docintf, TableIndex);
node := GetHtmlTableCell(tblintf, RowIndex, ColIndex);
Result := node <> nil;
if Result then
ResValue := Trim(node.innerHTML);
end;
function GeHtmlTableHtml(aTable: IHTMLTable; aRow: Integer): IHTMLElement;
var
Row: IHTMLTableRow;
begin
Result := nil;
if aTable = nil then Exit;
if aTable.rows = nil then Exit;
Row := aTable.rows.item(aRow, aRow) as IHTMLTableRow;
if Row = nil then Exit;
Result := Row as IHTMLElement;
end;
function GetWebBrowserHtmlTableHtml(const AWebBrowser: TWebBrowser;
const TableIndex, RowIndex: Integer;
var ResValue: string): Boolean;
var
Docintf: IHTMLDocument2;
tblintf: IHTMLTable;
node: IHTMLElement;
begin
ResValue := ' ';
docintf := AWebBrowser.Document as IHTMLDocument2;
tblintf := GetHtmlTable(docintf, TableIndex);
node := GeHtmlTableHtml(tblintf, RowIndex);
Result := node <> nil;
if Result then
ResValue := node.innerHtml;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
WebBrowser1.Navigate('H:\ReadTable\00.html');
end;
procedure TForm1.Button1Click(Sender: TObject);
var
ResValue: string;
begin
if GetWebBrowserHtmlTableCellText(WebBrowser1, 0, 0, 0, ResValue) then
begin
ShowMessage(ResValue);
end else
begin
ShowMessage('指定的表格不存在 ');
end;
end;
end.
