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c ++中的Xpath查询(Xpath Query in c++)

 我需要在C ++中使用xpath查询来直接从节点<revisions>获取idNumber 。 我尝试了以下内容，它总是返回null 。 请让我知道我做错了什么。 
 

 xml文件： 
 

<?xml version="1.0" encoding="UTF-8" ?>

<cw:vessel version="1.07.0075" creationDate="2016-01-26" xmlns:cw="urn:container">
    <!-- saved from url=(0024)http://www.systemsoftsol.com/ -->
    <Exchanger>
        <revisions>
            <revision>
               <idNumber>1401889476</idNumber>
               <revNumber>0</revNumber>
               <revDate>2014-06-04</revDate>
               <operator>devin</operator>
               <notes>read me</notes>
            </revision>
        </revisions>
  </Exchanger>
</cw:vessel>

 

 我的代码到目前为止： 
 

void GetProperties()
{
    HRESULT                         hr = NOERROR;
    CComPtr<::IXMLDOMDocument3>     m_pxmlDomDocument = NULL;
    CComPtr<::IXMLDOMNode>          pNode = NULL;
    IXMLDOMNodeList*                pChildlist = NULL;
    VARIANT_BOOL                    vLoadBool = VARIANT_FALSE;
    hr = m_pxmlDomDocument.CoCreateInstance(__uuidof(DOMDocument60));
    hr = m_pxmlDomDocument->setProperty(BSTR(L"SelectionLanguage"), (CComVariant)L"XPath");
    hr = m_pxmlDomDocument->setProperty((CComBSTR)"MaxElementDepth", (CComVariant)INT_MAX);
    if (FAILED(hr))
    {
        hr = ERROR_XML_PARSE_ERROR;
    }
    CComVariant varXmlFileName(_T("xmlfileinput"));
    m_pxmlDomDocument->load(varXmlFileName, &vLoadBool);
    hr = m_pxmlDomDocument->get_documentElement(&pDocRoot);
    hr = pDocRoot->selectSingleNode(_T("//Exchanger"), &pNode);
    pNode->get_childNodes(&pChildlist);
    long size;
    hr = pChildlist->get_length(&size);
    for (int i = 0; i < size; i++)
    {
        CComPtr<::IXMLDOMNode> referNode;
        hr = pChildlist->get_item(i, &referNode);
        if (referNode != NULL)
        {
            CString         csXPathQuery;
            csXPathQuery.Append(_T("/idNumber"));// i need this from above xml
            CComBSTR                    csBstrQuery(csXPathQuery);
            CComPtr<::IXMLDOMNode> pPa;
            hr = referNode->selectSingleNode(csBstrQuery.m_str, &pPa);
        }
    }
}   

 

 selectSingleNode()在上面的代码片段中返回null ，即使我在xml文件中仍然有idNumber 。 

I need a xpath query in C++ to get the idNumber directly from the node <revisions>. I tried the following and it always returns null. Please let me know what I am doing wrong. 
 

xml File:
 

<?xml version="1.0" encoding="UTF-8" ?>

<cw:vessel version="1.07.0075" creationDate="2016-01-26" xmlns:cw="urn:container">
    <!-- saved from url=(0024)http://www.systemsoftsol.com/ -->
    <Exchanger>
        <revisions>
            <revision>
               <idNumber>1401889476</idNumber>
               <revNumber>0</revNumber>
               <revDate>2014-06-04</revDate>
               <operator>devin</operator>
               <notes>read me</notes>
            </revision>
        </revisions>
  </Exchanger>
</cw:vessel>

 

My code so far:
 

void GetProperties()
{
    HRESULT                         hr = NOERROR;
    CComPtr<::IXMLDOMDocument3>     m_pxmlDomDocument = NULL;
    CComPtr<::IXMLDOMNode>          pNode = NULL;
    IXMLDOMNodeList*                pChildlist = NULL;
    VARIANT_BOOL                    vLoadBool = VARIANT_FALSE;
    hr = m_pxmlDomDocument.CoCreateInstance(__uuidof(DOMDocument60));
    hr = m_pxmlDomDocument->setProperty(BSTR(L"SelectionLanguage"), (CComVariant)L"XPath");
    hr = m_pxmlDomDocument->setProperty((CComBSTR)"MaxElementDepth", (CComVariant)INT_MAX);
    if (FAILED(hr))
    {
        hr = ERROR_XML_PARSE_ERROR;
    }
    CComVariant varXmlFileName(_T("xmlfileinput"));
    m_pxmlDomDocument->load(varXmlFileName, &vLoadBool);
    hr = m_pxmlDomDocument->get_documentElement(&pDocRoot);
    hr = pDocRoot->selectSingleNode(_T("//Exchanger"), &pNode);
    pNode->get_childNodes(&pChildlist);
    long size;
    hr = pChildlist->get_length(&size);
    for (int i = 0; i < size; i++)
    {
        CComPtr<::IXMLDOMNode> referNode;
        hr = pChildlist->get_item(i, &referNode);
        if (referNode != NULL)
        {
            CString         csXPathQuery;
            csXPathQuery.Append(_T("/idNumber"));// i need this from above xml
            CComBSTR                    csBstrQuery(csXPathQuery);
            CComPtr<::IXMLDOMNode> pPa;
            hr = referNode->selectSingleNode(csBstrQuery.m_str, &pPa);
        }
    }
}   

 

selectSingleNode() returns null in the above piece of code even though I still have the idNumber in the xml file.

原文：https://stackoverflow.com/questions/35580202
更新时间：2023-11-10 14:11

最满意答案

 我刚写了一些可能有帮助的代码。 这还没有使用任何scala DSL用于硒。 
 

class EnrollTest extends FlatSpec with ShouldMatchers{

  var driver = new FirefoxDriver
  driver.manage.timeouts.implicitlyWait(10, TimeUnit.SECONDS)


  val beginnersPage = BeginnersPage.open(driver)

  "Enroll button" should "open enroll page" in {
    try {
      val timeOfFirstCourse = beginnersPage.enrollForTheFirstCourse
      val enrollPage = new EnrollPage(driver)

      enrollPage.shouldBeOpen
      enrollPage.courseDetails should include(timeOfFirstCourse)
    }
    finally{
      driver.quit
    }
  }

}

 

 和页面类： 
 

object BeginnersPage{
  val url = "http://"+System.getProperty("testUrl", "www.2ndlanguage.co.uk")+"/beginners.action"

  def open(driver : WebDriver) : BeginnersPage = {
    driver.get(url)
    new BeginnersPage(driver)
  }

}

class BeginnersPage(driver : WebDriver){
  private var firstEnrollButton: WebElement = driver.findElement(By.xpath("//div[@class='newPriceBoxRight']/a/div"))
  private var firstCourseTime: WebElement = driver.findElement(By.xpath("//div[@class='newPriceBoxLeft']//span[@id='time']"))

  def enrollForTheFirstCourse : String = {
    val time = firstCourseTime.getText
    firstEnrollButton.click
    time
  }
}

class EnrollPage(driver : WebDriver){
  def isOpen = driver.getCurrentUrl startsWith "http://www.2ndlanguage.co.uk/offer.action"
  def courseDetails = driver.findElement(By.id("courseDetailsTextArea")).getText
}


I just wrote some code which might be of help. This isn't using any scala DSL for selenium yet.
 

class EnrollTest extends FlatSpec with ShouldMatchers{

  var driver = new FirefoxDriver
  driver.manage.timeouts.implicitlyWait(10, TimeUnit.SECONDS)


  val beginnersPage = BeginnersPage.open(driver)

  "Enroll button" should "open enroll page" in {
    try {
      val timeOfFirstCourse = beginnersPage.enrollForTheFirstCourse
      val enrollPage = new EnrollPage(driver)

      enrollPage.shouldBeOpen
      enrollPage.courseDetails should include(timeOfFirstCourse)
    }
    finally{
      driver.quit
    }
  }

}

 

And the page classes:
 

object BeginnersPage{
  val url = "http://"+System.getProperty("testUrl", "www.2ndlanguage.co.uk")+"/beginners.action"

  def open(driver : WebDriver) : BeginnersPage = {
    driver.get(url)
    new BeginnersPage(driver)
  }

}

class BeginnersPage(driver : WebDriver){
  private var firstEnrollButton: WebElement = driver.findElement(By.xpath("//div[@class='newPriceBoxRight']/a/div"))
  private var firstCourseTime: WebElement = driver.findElement(By.xpath("//div[@class='newPriceBoxLeft']//span[@id='time']"))

  def enrollForTheFirstCourse : String = {
    val time = firstCourseTime.getText
    firstEnrollButton.click
    time
  }
}

class EnrollPage(driver : WebDriver){
  def isOpen = driver.getCurrentUrl startsWith "http://www.2ndlanguage.co.uk/offer.action"
  def courseDetails = driver.findElement(By.id("courseDetailsTextArea")).getText
}

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