C++ XLST 转换无法使用 MSXML 3.0 工作
我是 C++ 新手,继承了以下代码,该代码应该使用 XSLT 文件转换给定的 XML 以仅吐出文本值。
它可以很好地加载 XML 和 XSLT,transformnode() 调用返回成功,但尚未应用任何转换。底部的原始输出包含完整的原始 XML。
它使用 MSXML 3.0。我使用 Xselerator 来验证 XSLT 是否有效且有效(即返回字符串“This is a test message..”)。
下面是代码(减去所有错误处理):
IXMLDOMNode *m_pXslt;
ESSXsltData::Initialise(void)
{
IUnknown *l_pUnknown = NULL;
IXMLDOMDocument *l_pXSLDocument = NULL;
HRESULT hr = CoCreateInstance(__uuidof(DOMDocument), NULL, CLSCTX_ALL, IID_IUnknown, (LPVOID *)&l_pUnknown);
hr = l_pUnknown->QueryInterface(IID_IXMLDOMDocument,(LPVOID *)&l_pXSLDocument);
CString l_sFileName(RetrieveXsltFileName().c_str() );
hr = l_pXSLDocument->load(l_vFileName, &l_bSuccess);
hr = l_pXSLDocument->QueryInterface(IID_IXMLDOMNode, (LPVOID *)(&m_pXslt) );
}
HRESULT ESSXsltData::ApplyXslt(const char *p_pszESSXml, std::vector< std::string > &p_CommentLines)
{
IUnknown *l_pUnknown = NULL;
IXMLDOMDocument *l_pDocument = NULL;
if (p_pszESSXml)
{
VARIANT_BOOL l_bSuccess;
HRESULT hr = CoCreateInstance(__uuidof(DOMDocument), NULL, CLSCTX_ALL, IID_IUnknown, (LPVOID *)&l_pUnknown);
hr = l_pUnknown->QueryInterface(IID_IXMLDOMDocument,(LPVOID *)&l_pDocument);
hr = l_pDocument->loadXML(CComBSTR(p_pszESSXml) , &l_bSuccess);
hr = l_pDocument->QueryInterface(IID_IXMLDOMNode, (LPVOID *)(&m_pXslt) );
BSTR l_bsOutput = NULL;
hr = l_pDocument->transformNode(m_pXslt, &l_bsOutput);
COLE2T l_AsciiOutput(l_bsOutput);
log << "AsciiOutput: " << l_AsciiOutput << "\n";
}
}
p_pszESSXml 字符串是:
<ESS><Message>This is a test message...</Message></ESS>
XSLT 是:
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl">
<xsl:output method="text" indent="yes"/>
<xsl:template match="ESS">
<xsl:apply-templates select="Message"/>
</xsl:template>
<xsl:template match="Message">
<xsl:value-of select="."/>
</xsl:template>
</xsl:stylesheet>
I'm new to C++ and inherited the following code that is supposed to transform the given XML using the XSLT file to just spit out the text values.
It loads both the XML and XSLT fine and the transformnode() call returns success but no transformation has been applied. The original output at the bottom contains the original XML intact .
It is using MSXML 3.0. I've used Xselerator to validate that the XSLT is valid and works (i.e. the string "This is a test message.." is returned).
Here is the code (minus all the error handling):
IXMLDOMNode *m_pXslt;
ESSXsltData::Initialise(void)
{
IUnknown *l_pUnknown = NULL;
IXMLDOMDocument *l_pXSLDocument = NULL;
HRESULT hr = CoCreateInstance(__uuidof(DOMDocument), NULL, CLSCTX_ALL, IID_IUnknown, (LPVOID *)&l_pUnknown);
hr = l_pUnknown->QueryInterface(IID_IXMLDOMDocument,(LPVOID *)&l_pXSLDocument);
CString l_sFileName(RetrieveXsltFileName().c_str() );
hr = l_pXSLDocument->load(l_vFileName, &l_bSuccess);
hr = l_pXSLDocument->QueryInterface(IID_IXMLDOMNode, (LPVOID *)(&m_pXslt) );
}
HRESULT ESSXsltData::ApplyXslt(const char *p_pszESSXml, std::vector< std::string > &p_CommentLines)
{
IUnknown *l_pUnknown = NULL;
IXMLDOMDocument *l_pDocument = NULL;
if (p_pszESSXml)
{
VARIANT_BOOL l_bSuccess;
HRESULT hr = CoCreateInstance(__uuidof(DOMDocument), NULL, CLSCTX_ALL, IID_IUnknown, (LPVOID *)&l_pUnknown);
hr = l_pUnknown->QueryInterface(IID_IXMLDOMDocument,(LPVOID *)&l_pDocument);
hr = l_pDocument->loadXML(CComBSTR(p_pszESSXml) , &l_bSuccess);
hr = l_pDocument->QueryInterface(IID_IXMLDOMNode, (LPVOID *)(&m_pXslt) );
BSTR l_bsOutput = NULL;
hr = l_pDocument->transformNode(m_pXslt, &l_bsOutput);
COLE2T l_AsciiOutput(l_bsOutput);
log << "AsciiOutput: " << l_AsciiOutput << "\n";
}
}
The p_pszESSXml string is:
<ESS><Message>This is a test message...</Message></ESS>
The XSLT is:
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl">
<xsl:output method="text" indent="yes"/>
<xsl:template match="ESS">
<xsl:apply-templates select="Message"/>
</xsl:template>
<xsl:template match="Message">
<xsl:value-of select="."/>
</xsl:template>
</xsl:stylesheet>
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修好了。
它重新分配 m_pXslt 以等于 XML 应该被验证。
有人一直在复制和粘贴。
Fixed it.
It was reassigning m_pXslt to equal the XML is was supposed to be validating.
Someone has been copying and pasting.