15

如何使用 DIHtmlParser 从标签中解析Name: & Value文本？我尝试使用 Clever Components 的 TCLHtmlParser 进行此操作，但失败了。第二个问题是 DIHtmlParser 是否可以解析单个标签，例如循环遍历其子标签。对于这样一个简单的问题，它简直就是一场噩梦。

<div class="tvRow tvFirst hasLabel tvFirst" title="example1">
  <label class="tvLabel">Name:</label>
  <span class="tvValue">Value</span>
<div class="clear"></div></div>

<div class="tvRow tvFirst hasLabel tvFirst" title="example2">
  <label class="tvLabel">Name:</label>
  <span class="tvValue">Value</span>
<div class="clear"></div></div>
4

3 回答 3

17

您可以使用IHTMLDocument2DOM 从 HTML 中解析您需要的任何元素：

uses ActiveX, MSHTML;

const
  HTML =
  '<div class="tvRow tvFirst hasLabel tvFirst" title="example1">' +
  '<label class="tvLabel">Name:</label>' +
  '<span class="tvValue">Value</span>' +
  '<div class="clear"></div>' +
  '</div>';

procedure TForm1.Button1Click(Sender: TObject);
var
  doc: OleVariant;
  el: OleVariant;
  i: Integer;
begin
  doc := coHTMLDocument.Create as IHTMLDocument2;
  doc.write(HTML);
  doc.close;
  ShowMessage(doc.body.innerHTML);
  for i := 0 to doc.body.all.length - 1 do
  begin
    el := doc.body.all.item(i);
    if (el.tagName = 'LABEL') and (el.className = 'tvLabel') then
      ShowMessage(el.innerText);
    if (el.tagName = 'SPAN') and (el.className = 'tvValue') then
      ShowMessage(el.innerText);
  end;
end;

我想提一下我今天发现的另一个非常好的 HTML 解析器：htmlp（Delphi Dom HTML Parser and Converter）。它不像IHTMLDocument2显然那样灵活，但它非常易于使用、快速、免费，并且支持旧 Delphi 版本的 Unicode。

示例用法：

uses HtmlParser, DomCore;

function GetDocBody(HtmlDoc: TDocument): TElement;
var
  i: integer;
  node: TNode;
begin
  Result := nil;
  for i := 0 to HtmlDoc.documentElement.childNodes.length - 1 do
  begin
    node := HtmlDoc.documentElement.childNodes.item(i);
    if node.nodeName = 'body' then
    begin
      Result := node as TElement;
      Break;
    end;
  end;
end;

procedure THTMLForm.Button2Click(Sender: TObject);
var
  HtmlParser: THtmlParser;
  HtmlDoc: TDocument;
  i: Integer;
  body, el: TElement;
  node: TNode;
begin
  HtmlParser := THtmlParser.Create;
  try
    HtmlDoc := HtmlParser.parseString(HTML);
    try
      body := GetDocBody(HtmlDoc);
      if Assigned(body) then
        for i := 0 to body.childNodes.length - 1 do
        begin
          node := body.childNodes.item(i);
          if (node is TElement) then
          begin
            el := node as TElement;
            if (el.tagName = 'div') and (el.GetAttribute('class') = 'tvRow tvFirst hasLabel tvFirst') then
            begin
              // iterate el.childNodes here...
              ShowMessage(IntToStr(el.childNodes.length));
            end;
          end;
        end;
    finally
      HtmlDoc.Free;
    end;
  finally
    HtmlParser.Free
  end;
end;
于 2013-01-16T00:40:36.200 回答
0

使用 HTML Parser 处理您的 html 文件。

也许DIHtmlParser会完成这项工作。

RegEx 不是解析器，从 HTML 转换为 JSON 不是一个明智的选择。

于 2013-01-15T23:02:12.553 回答
0

还可以将HTMLP 解析器与 THtmlFormatter 和OXml XPath 解析结合使用

uses
  // Htmlp
  HtmlParser,
  DomCore,
  Formatter,
  // OXml
  OXmlPDOM,
  OXmlUtils;

function HtmlToXHtml(const Html: string): string;
var
  HtmlParser: THtmlParser;
  HtmlDoc: TDocument;
  Formatter: THtmlFormatter;
begin
  HtmlParser := THtmlParser.Create;
  try
    HtmlDoc := HtmlParser.ParseString(Html);
    try
      Formatter := THtmlFormatter.Create;
      try
        Result := Formatter.GetText(HtmlDoc);
      finally
        Formatter.Free;
      end;
    finally
      HtmlDoc.Free;
    end;
  finally
    HtmlParser.Free;
  end;
end;

type
  TCard = record
    Store: string;
    Quality: string;
    Quantity: string;
    Price: string;
  end;
  TCards = array of TCard;

function ParseCard(const Node: PXMLNode): TCard;
const
  StoreXPath = 'div[1]/ax';
  QualityXPath = 'div[3]';
  QuantityXPath = 'div[4]';
  PriceXPath = 'div[5]';
var
  CurrentNode: PXMLNode;
begin
  Result := Default(TCard);
  if Node.SelectNode(StoreXPath, CurrentNode) then
     Result.Store := CurrentNode.Text;
  if Node.SelectNode(QualityXPath, CurrentNode) then
     Result.Quality := CurrentNode.Text;
  if Node.SelectNode(QuantityXPath, CurrentNode) then
     Result.Quantity := CurrentNode.Text;
  if Node.SelectNode(PriceXPath, CurrentNode) then
     Result.Price := CurrentNode.Text;
end;

procedure THTMLForm.OpenButtonClick(Sender: TObject);
var
  Html: string;
  Xml: string;
  FXmlDocument: IXMLDocument;
  QueryNode: PXMLNode;
  XPath: string;
  NodeList: IXMLNodeList;
  i: Integer;
  Card: TCard;
begin
  Html := System.IOUtils.TFile.ReadAllText(FileNameEdit.Text, TEncoding.UTF8);
  Xml := HtmlToXHtml(Html);
  Memo.Lines.Text := Xml;

  // Parse with XPath
  FXMLDocument := CreateXMLDoc;
  FXMLDocument.WriterSettings.IndentType := itIndent;
  if not FXMLDocument.LoadFromXML(Xml) then
    raise Exception.Create('Source document is not valid');
  QueryNode := FXmlDocument.DocumentElement;
  XPath := '//div[@class="row pricetableline"]';
  NodeList := QueryNode.SelectNodes(XPath);
  for i := 0 to NodeList.Count -1 do
  begin
    Card := ParseCard(NodeList[i]);
    Memo.Lines.Text := Memo.Lines.Text + sLineBreak +
      Format('%0:s %1:s %2:s %3:s', [Card.Store, Card.Quality, Card.Quantity, Card.Price]);
  end;

  Memo.SelStart := 0;
  Memo.SelLength := 0;
end;
于 2016-03-28T21:40:16.533 回答