在Delphi中使用XPath查找元素 [英] Finding elements with XPath in Delphi
本文介绍了在Delphi中使用XPath查找元素的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图在Delphi中的XML文档中找到一个元素。我有这段代码，但是它总是在日志中显示0个元素：
I am trying to find an element in an XML document in Delphi. I have this code, but it always says 0 elements in the log:
function TForm1.KannaSidu: Boolean;
var
Doc: IXMLDOMDocument;
List: IXMLDomNodeList;
begin
try
Doc := CreateOleObject('Microsoft.XMLDOM') as IXMLDomDocument;
Doc.async:=False;
Doc.load(Filename);
except
LogTx('Error on page');
end;
List:=Doc.selectNodes('/html/head');
LogTx(IntToStr(List.length)+' elements');
Result:=False;
end;
那么如何使XPath工作？
So how do I make XPath work?
推荐答案
如果您只是尝试将普通的html文件加载为xml，则可能有多种原因导致失败并阻塞：
If you're just trying to load a plain html file as xml, it would probably have multiple reasons to fail and choke on things like:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
在执行其他操作之前，您必须测试它是否正确加载：
You have to test that it actually loads correctly before doing anything else:
if not Doc.load(filename) then
raise Exception.Create('XML Loading error:' + Trim(Doc.parseError.reason));
它将为您提供发生这种故障的具体原因：
It will give you the specific reason for the failure like this one:
XML Loading error:End tag 'head' does not match the start tag 'link'.
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