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鉴于以下文件,我想提取tns:EchoResponse. (为了便于阅读,对原始文档进行了美化。)

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
  xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <tns:EchoResponse 
          xmlns:tns="http://www.apis-it.hr/fin/2012/types/f73" 
          xsi:schemaLocation="http://www.apis-it.hr/fin/2012/types/f73 FiskalizacijaSchema.xsd "
          >
            hello
         </tns:EchoResponse>
    </soap:Body>
</soap:Envelope>

我解析了文档,创建了 XPath 上下文,注册了命名空间soaptns,然后使用以下 XPath 表达式运行了查询。

//soap:Envelope[1]/soap:Body[1]/tns:EchoResponse[1]

不幸的是,只有忽略名称空间并仅使用本地名称的查找似乎有效:

//*[local-name(.) = 'Envelope']/*[local-name(.) = 'Body'][1]/*[local-name(.) = 'EchoResponse'][1]

所以……我做错了什么?我错误地假设了什么?这是处理此文档的代码片段。

    xmlDocPtr xmldoc = xmlReadMemory(databuffer, datasize, ISFEndpointURL(), NULL, 0);
    if(!xmldoc)
    {
        err = -1;
        goto finalize;
    }

    xmlXPathContextPtr xpathCtx = xmlXPathNewContext(xmldoc);
    if(!xpathCtx)
    {
        err = -1;
        xmlFreeDoc(xmldoc);
        goto finalize;
    }

    xmlXPathRegisterNs(xpathCtx, BAD_CAST "soap", BAD_CAST "http://schemas.xmlsoap.org/soap/envelope");
    xmlXPathRegisterNs(xpathCtx, BAD_CAST "tns", BAD_CAST "http://www.apis-it.hr/fin/2012/types/f73");

    // //soap:Envelope[1]/soap:Body[1]/*[local-name(.) = 'EchoResponse']
    xmlXPathObjectPtr xpathObj = xmlXPathEvalExpression(BAD_CAST "./*[local-name(.) = 'Envelope']/*[local-name(.) = 'Body'][1]/*[local-name(.) = 'EchoResponse'][1]", xpathCtx);
    if(!xpathObj)
    {
        err = -1;
        xmlXPathFreeContext(xpathCtx);
        xmlFreeDoc(xmldoc);
        goto finalize;
    }
    if(xmlXPathNodeSetIsEmpty(xpathObj->nodesetval)){
        err = -1;
        xmlXPathFreeObject(xpathObj);
        xmlXPathFreeContext(xpathCtx);
        xmlFreeDoc(xmldoc);
        printf("%s: No XPath result\n", __FUNCTION__);
        goto finalize;
    }


    if(strcmp((char *)xmlXPathCastNodeSetToString(xpathObj->nodesetval), echoText))
    {
        err = 1;
        xmlXPathFreeObject(xpathObj);
        xmlXPathFreeContext(xpathCtx);
        xmlFreeDoc(xmldoc);
        printf("%s: Incorrect echo result: %s\n", __FUNCTION__, xpathObj->stringval);
        goto finalize;
    }

    xmlXPathFreeObject(xpathObj);
    xmlXPathFreeContext(xpathCtx);
4

1 回答 1

2

XML 文档中的soap前缀绑定到命名空间 URI

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

soap而您的代码将XPath 上下文中的前缀绑定到不同的 URI

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

XPath 不匹配任何内容,因为它正在寻找错误的名称空间。

于 2013-01-29T14:50:44.340 回答