XPATH包含(字符串,字符串)不工作

我有一个XML文件,如下所示。。。

<a>
  <b>
    <version>1.0</version>
    <c>
       <Module>foo.EXE</Module>
    </c>
    <c>
       <Module>bar.DLL</Module>
    </c>
  </b>
</a>

    CComPtr<MSXML2::IXMLDOMNodeList> oRes = NULL ;
    HRESULT hResult = m_StartNode->selectNodes(sQuery, &oRes) ;

当sQuery是 //a/b/c[Module[contains(.,'EXE')]] ,则hResult为E_FAIL,并且::GetLastError()返回0。

无可否认,我对XPATH还不熟悉,但为什么不返回所有包含“EXE”的Module元素的“c”元素呢。

其他简单的XPATH表达式也可以工作。 //a/b/c

下面是一个完整的控制台应用程序,演示了这个问题。

// XMLTest.cpp : Defines the entry point for the console application.
#include "stdafx.h"
#import <msxml3.dll> raw_interfaces_only rename("value", "xmlvalue")

int _tmain(int argc, _TCHAR* argv[])
{
    CoInitialize(NULL);
    CComPtr<MSXML2::IXMLDOMDocument> thedoc;
    thedoc.CoCreateInstance(__uuidof(MSXML2::DOMDocument));
    _variant_t filename(L"c:\\shared\\test\\BlackListSmall.xml");
    VARIANT_BOOL success;
    HRESULT res = thedoc->load(filename, &success);
    _bstr_t sQuery = L"//a/b/c[Module[contains(.,'EXE')]]";
    CComPtr<MSXML2::IXMLDOMNodeList> oRes;
    thedoc->selectNodes(sQuery, &oRes);
    thedoc = NULL;
    oRes = NULL;
    CoUninitialize();
    return 0;
}

这是stdafx.h的内容

#pragma once
#include "targetver.h"
#include <stdio.h>
#include <tchar.h>
#ifndef STRICT
#define STRICT
#endif
#define _ATL_APARTMENT_THREADED
#define _ATL_NO_AUTOMATIC_NAMESPACE
#define _ATL_CSTRING_EXPLICIT_CONSTRUCTORS  // some CString constructors will be explicit
#include <atlbase.h>
#include <atlcom.h>
#include <atlctl.h>
using namespace ATL;

First-chance exception at 0x7564fbae in XMLTest.exe: 0xE0000001: 0xe0000001.
First-chance exception at 0x7564fbae in XMLTest.exe: 0xE0000001: 0xe0000001.
First-chance exception at 0x7564fbae in XMLTest.exe: 0xE0000001: 0xe0000001.

... 当我中断所有异常时,调用堆栈不提供真正的信息。

#import <msxml4.dll> raw_interfaces_only rename("value", "xmlvalue")
...
CComPtr<MSXML2::IXMLDOMDocument2> thedoc; //changed from IXMLDOMDocument
...
HRESULT res = thedoc->load(filename, &success);    // unchanged
_bstr_t lang = L"SelectionLanguage";  // inserted 
_variant_t xpathlang = L"XPath";      // inserted
thedoc->setProperty(lang,xpathlang);  // inserted
_bstr_t sQuery = L"//a/b/c[Module[contains(.,'EXE')]]";  //unchanged
...

再次感谢迪米特