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实例简析XPath串函数和XSLT

黄舟

Release： 2017-03-01 16:53:37

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XPath(xml Path language)是一种处理XML文档段的语言。XSLT(Extensible Stylesheet Language Transformations,可扩展样式表语言转换)使用XPath描述表达式和地址路径控制节点选取。XSLT可以将XML转换为各种格式，如HTML或其他格式。
下面用一个邮件合并程序来简要说明XPath的串函数。下面的XML文件中包含数据，XSLT文件中包含对邮件格式的定义。MSXML4.0对XML文档应用样式表，产生一个合并的邮件文本文档。
XML文件 Letter.xml



  July 17, 2002
  
     Vicky
     P
     Male
  
  
     900 National Pkwy
     Suite 105
     Bellevue
     WA
     98007
     USA
  
  ESTATE OF JOHN DOE / FILE NO. 12345.6789
  
     Please pay the PRoperty taxes as soon as possible.
  
  
     John
     M
     Sr. Tax Consultant

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XSLT样式表文档 Letter.xsl







   
   
To,










Regarding: 

Dear Mr. Miss 
,



Sincerely,

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上面的样式表举例说明了concat和starts-with XPath串函数和怎样在输出文本中增加新行，还有定义和使用变量。
下面是程序的执行结果。

1.VC6建立Win32控制台应用程序。
2.在stdafx.h中添加下面的代码：

#include 
#include 
#include 
#import "msxml4.dll"
// If this import statement fails, you need to install MSXML 4.0 SP1 from:
//http://msdn.microsoft.com/downloads/sample.asp?url=/MSDN-FILES/027/001/766/msdncompositedoc.xml
#include 
// If this include statement fails, you need to install MSXML 4.0 SP1 SDK from:
//http://msdn.microsoft.com/downloads/sample.asp?url=/MSDN-FILES/027/001/766/msdncompositedoc.xml
// You also need to add the include file and library search path
// to Visual C++'s list of directories (Tools > Options... > Directories).
using namespace MSXML2;
inline void EVAL_HR( HRESULT _hr ) 
   { if FAILED(_hr) throw(_hr); }
#define TEMP_SIZE  _MAX_PATH               // size of short buffer
static _TCHAR   szTemp[TEMP_SIZE];         // multipurpose buffer on stack
static DWord    dwLen;

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3.上面的代码引入MSXML4类型库，包含MSXML头文件，检查HRESULT值并声明了一些全局变量。
4.main函数：

  int main(int argc, char* argv[])
{
 try
 {
  EVAL_HR(CoInitialize(NULL));
  // Make sure that MSXML 4.0 is installed
  if (!isMSXMLInstalled())
   return -1;
  // Make sure that XML and XSL file names are passed
  // as command line parameters
  if (argc < 3)
   // Show proper message here
   return -1;
  
  IXMLDOMDocument2Ptr pXMLDoc = NULL;
  IXMLDOMDocument2Ptr pXSLDoc = NULL;
  
  // Load the XML document
  if (loadDocument(pXMLDoc, argv[1], true))
  {
   // Load the stylesheet
   if (loadDocument(pXSLDoc, argv[2], false))
   {
    _ftprintf(stdout, pXMLDoc->transformNode(pXSLDoc));
   }
   else
   {
    printMSXMLError(pXSLDoc);
   }
  }
  else
  {
   printMSXMLError(pXMLDoc);
  }
 }
 catch(...)
 {//exception handling
 }
 
 _ftprintf(stdout, "\n\nPress Enter to continue...");
 getchar();
 CoUninitialize();
 return 0;
}

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5.XML文件和XSLT样式表文件名作为命令行参数传递给应用程序。主函数通过调用isMSXMLInstalled验证 MSXML4.0是否安装。接下来两次调用loadDocument;先是加载XML文档,然后是加载XSLT样式表。最后调用transformNode进行转换。

6.本例代码下载：http://www.perfectxml.com/CPPMSXML/downloads/20020716MailMerge.zip

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