有人可以解释为什么ChildNodes.FindNode('')( 1 )失败但ChildNodes ['']( 2 )成功吗? ==>
代码:
const
cNodeSOAPEnvelope = 's:Envelope';
cNodeSOAPBody = 's:Body';
cNodeSOAPBodyFault = 's:Fault';
cNodeSOAPHeader = 's:Header';
cNodeFaultCode = 'faultcode';
cNodeFaultString = 'faultstring';
procedure TFrmXMLParsingTests.BtnTestClick(Sender: TObject);
var
SoapBodyNode,
SoapBodyFaultNode,
SoapHeaderNode,
FaultCodeNode,
FaultTextNode,
RootNode: IXmlNode;
begin
RootNode := XMLDoc.DocumentElement;
Assert(RootNode.NodeName = cNodeSOAPEnvelope,'Root node is not SOAP envelope');
SoapBodyNode := RootNode.ChildNodes[cNodeSOAPBody];
SoapBodyFaultNode := SoapBodyNode.ChildNodes[cNodeSOAPBodyFault];
if SoapBodyFaultNode <> nil then
begin
// FaultCodeNode := SoapBodyFaultNode.ChildNodes.FindNode(cNodeFaultCode); (*1*)
// FaultTextNode := SoapBodyFaultNode.ChildNodes.FindNode(cNodeFaultString); (*1*)
FaultCodeNode := SoapBodyFaultNode.ChildNodes[cNodeFaultCode]; (*2*)
FaultTextNode := SoapBodyFaultNode.ChildNodes[cNodeFaultString]; (*2*)
Exit; // Nothing more to do
end; { fault in body }
SoapHeaderNode := RootNode.ChildNodes.FindNode(cNodeSOAPHeader);
Assert(SoapHeaderNode <> nil,'SOAP Header not found');
end;
XML:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<s:Fault>
<faultcode xmlns:a="http://schemas.microsoft.com/exchange/services/2006/types">a:ErrorSchemaValidation</faultcode>
<faultstring xml:lang="nl-NL">The [snip] value.</faultstring>
<detail>
<e:ResponseCode xmlns:e="http://schemas.microsoft.com/exchange/services/2006/errors">ErrorSchemaValidation</e:ResponseCode>
<e:Message xmlns:e="http://schemas.microsoft.com/exchange/services/2006/errors">The request failed schema validation.</e:Message>
<t:MessageXml xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<t:LineNumber>10</t:LineNumber>
<t:LinePosition>30</t:LinePosition>
<t:Violation>The [snip] value.</t:Violation>
</t:MessageXml>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>
感谢
扬
答案 0 :(得分:3)
Read the documentation。当您访问要求不存在的节点的ChildNodes[]
属性时,如果在父XMLDocument的doNodeAutoCreate
属性中启用了Options
标志,则会自动创建一个新节点,否则为{{ 1}}异常将被提出。
更新:由于您的文档中包含多个XML命名空间,因此在使用EXMLDocError
属性和ChildNodes[]
方法时需要考虑命名空间。您的代码未正确找到FindNode()
和<faultcode>
节点的原因是因为它们具有不同的命名空间(实际上,它们根本没有任何命名空间),而<faultstring>
标记具有,但<Fault>
属性和1参数ChildNodes[]
方法要求它们具有与其父节点相同的命名空间。在命名空间节点中搜索具有不同命名空间的子节点时,必须在搜索中包含子节点名称空间才能正确查找子节点。
试试这个:
FindNode()
答案 1 :(得分:0)
编写自己的函数:
function SearchChilds(StartNode: IXMLNode; Nodename: string): IXMLnode;
var i: Integer;
begin
Result := nil;
for i := 0 to StartNode.ChildNodes.Count-1 do
begin
if (StartNode.ChildNodes[i] <> nil) and (StartNode.ChildNodes[i].LocalName = Nodename) then
begin
Result := StartNode.ChildNodes[i];
break;
end;
if StartNode.ChildNodes[i].HasChildNodes then
begin
Result := SearchChilds(StartNode.ChildNodes[i], Nodename);
if Result<>nil then break;
end;
end;
end;