xml - VBScript、MSXML 和命名空间

Question

给定以下 XML:

<?xml version="1.0"?>
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <soap:Body>
        <GetMsisdnResponse xmlns="http://my.domain.com/">
            <GetMsisdnResult>
                <RedirectUrl>http://my.domain.com/cw/DoIdentification.do2?sessionid=71de6551fc13e6625194</RedirectUrl>
            </GetMsisdnResult>
        </GetMsisdnResponse>
    </soap:Body>
</soap:Envelope>

我正在尝试使用 VBScript 中的 XPath 访问 RedirectUrl 元素:

set xml = CreateObject("MSXML2.DOMDocument")
xml.async = false
xml.validateOnParse = false
xml.resolveExternals = false
xml.setProperty "SelectionLanguage", "XPath"
xml.setProperty "SelectionNamespaces", "xmlns:s='http://my.domain.com/' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'"

err.clear
on error resume next
xml.loadXML (xmlhttp.responseText)
if (err.number = 0) then

    redirectUrl = xml.selectSingleNode("/soap:Envelope/soap:Body/s:GetMsisdnResponse/s:GetMsisdnResult/s:RedirectUrl").text
end if

但是找不到 RedirectUrl 节点，因此当我尝试获取 .text 属性时什么也没有。我做错了什么

Answer 1

您使用了错误的命名空间声明。

在你的 XML 中你有

http://www.w3.org/2003/05/soap-envelope

but in your Script, you use

http://schemas.xmlsoap.org/soap/envelope/

This works for me:

xml.setProperty "SelectionNamespaces", "xmlns:s='http://my.domain.com/' xmlns:soap='http://www.w3.org/2003/05/soap-envelope'"

' ...

Set redirectUrl = xml.selectSingleNode("/soap:Envelope/soap:Body/s:GetMsisdnResponse/s:GetMsisdnResult/s:RedirectUrl")

---

换句话说，我会尝试将受 On Error Resume Next 语句影响的行保持在绝对 最低限度。理想情况下，它仅对单个关键行有效(或者您将关键部分包装在 Sub 中)。这使得调试很多更容易。

例如，您在 Set redirectUrl = ... 中缺少 Set 语句。当 On Error Resume Next 开启时，这将无提示地失败。

尝试

' this is better than loadXML(xmlHttp.responseText)
xmlDocument.load(xmlHttp.responseStream)

If (xmlDocument.parseError.errorCode <> 0) Then
  ' react to the parsing error
End If

Xpath = "/soap:Envelope/soap:Body/s:GetMsisdnResponse/s:GetMsisdnResult/s:RedirectUrl"
Set redirectUrl = xml.selectSingleNode(Xpath)

If redirectUrl Is Nothing Then
  ' nothing found
Else
  ' do something
End If

请参阅 - 无需 On Error Resume Next。