在Windows上使用Xerces 3.0.1和C ++编写XML [英] writing XML with Xerces 3.0.1 and C++ on windows

问题描述

我有以下函数，我写了使用Xerces 3.0.1创建一个XML文件，如果我使用filePathfoo.xml或../foo.xml调用此函数它很好，但如果我传入c：/foo.xml然后我在这行上得到一个例外

  XMLFormatTarget * formatTarget = new LocalFileFormatTarget（ TARGETPATH）;有人可以解释为什么我的代码适用于相对路径，但不是绝对路径吗？
  

非常感谢。

  const int ABSOLUTE_PATH_FILENAME_PREFIX_SIZE = 9; 
 
 void OutputXML（xercesc :: DOMDocument * pmyDOMDocument，std :: string filePath）
 {
 //返回具有所需功能的第一个注册的实现。在这种情况下，我们在具有LS功能...或加载/保存的DOM实现之后。 
 DOMImplementation * implementation = DOMImplementationRegistry :: getDOMImplementation（LLS）; 
 
 //创建一个DOMLSSerializer，用于将DOM树序列化为XML文档。 
 DOMLSSerializer * serializer =（（DOMImplementationLS *）） - > createLSSerializer（）; 
 
 //通过插入换行符使输出更加人性化。 
 if（serializer-> getDomConfig（） - > canSetParameter（XMLUni :: fgDOMWRTFormatPrettyPrint，true））
 serializer-> getDomConfig（） - > setParameter（XMLUni :: fgDOMWRTFormatPrettyPrint，true）; 
 
 //要编写的XML中要使用的行尾序列。 
 serializer-> setNewLine（XMLString :: transcode（\r\\\
））; 
 
 //将路径转换为Xerces兼容的XMLCh *。 
 XMLCh * tempFilePath = XMLString :: transcode（filePath.c_str（））; 
 
 //计算字符串的长度。 
 const int pathLen = XMLString :: stringLen（tempFilePath）; 
 
 //为Xerces字符串分配内存以充分保存路径。 
 XMLCh * targetPath =（XMLCh *）XMLPlatformUtils :: fgMemoryManager-> allocate（（pathLen + ABSOLUTE_PATH_FILENAME_PREFIX_SIZE）* sizeof（XMLCh））; 
 
 //将依赖平台的绝对路径文件修复为标准URI格式。 
 XMLString :: fixURI（tempFilePath，targetPath）; 
 
 //指定XML输出的目标。 
 XMLFormatTarget * formatTarget = new LocalFileFormatTarget（targetPath）; 
 // XMLFormatTarget * myFormTarget = new StdOutFormatTarget（）; 
 
 //创建一个新的空输出目标对象。 
 DOMLSOutput * output =（（DOMImplementationLS *）实现） - > createLSOutput（）; 
 
 //将流设置为我们的目标。 
 output-> setByteStream（formatTarget）; 
 
 //将序列化输出写入目的地。 
 serializer-> write（pmyDOMDocument，output）; 
 
 //清理。 
 serializer-> release（）; 
 XMLString :: release（& tempFilePath）; 
删除formatTarget; 
 output-> release（）; 
} 
  

解决方案

您是否使用Windows Vista？也许你没有必要的权限？
看到这个问题：两行Xerces程序中的异常

i have the following function i wrote to create an XML file using Xerces 3.0.1, if i call this function with a filePath of "foo.xml" or "../foo.xml" it works great, but if i pass in "c:/foo.xml" then i get an exception on this line

XMLFormatTarget *formatTarget = new LocalFileFormatTarget(targetPath);

can someone explain why my code works for relative paths, but not absolute paths please? many thanks.

const int ABSOLUTE_PATH_FILENAME_PREFIX_SIZE = 9;

void OutputXML(xercesc::DOMDocument* pmyDOMDocument, std::string filePath)
{
    //Return the first registered implementation that has the desired features. In this case, we are after a DOM implementation that has the LS feature... or Load/Save.
    DOMImplementation *implementation = DOMImplementationRegistry::getDOMImplementation(L"LS");

    // Create a DOMLSSerializer which is used to serialize a DOM tree into an XML document.
    DOMLSSerializer *serializer = ((DOMImplementationLS*)implementation)->createLSSerializer();

    // Make the output more human readable by inserting line feeds.
    if (serializer->getDomConfig()->canSetParameter(XMLUni::fgDOMWRTFormatPrettyPrint, true))
        serializer->getDomConfig()->setParameter(XMLUni::fgDOMWRTFormatPrettyPrint, true);

    // The end-of-line sequence of characters to be used in the XML being written out. 
    serializer->setNewLine(XMLString::transcode("\r\n")); 

    // Convert the path into Xerces compatible XMLCh*.
    XMLCh *tempFilePath = XMLString::transcode(filePath.c_str());

    // Calculate the length of the string.
    const int pathLen = XMLString::stringLen(tempFilePath);

    // Allocate memory for a Xerces string sufficent to hold the path.
    XMLCh *targetPath = (XMLCh*)XMLPlatformUtils::fgMemoryManager->allocate((pathLen + ABSOLUTE_PATH_FILENAME_PREFIX_SIZE) * sizeof(XMLCh));

    // Fixes a platform dependent absolute path filename to standard URI form.
    XMLString::fixURI(tempFilePath, targetPath);

    // Specify the target for the XML output.
    XMLFormatTarget *formatTarget = new LocalFileFormatTarget(targetPath);
    //XMLFormatTarget *myFormTarget = new StdOutFormatTarget();

    // Create a new empty output destination object.
    DOMLSOutput *output = ((DOMImplementationLS*)implementation)->createLSOutput();

    // Set the stream to our target.
    output->setByteStream(formatTarget);

    // Write the serialized output to the destination.
    serializer->write(pmyDOMDocument, output);

    // Cleanup.
    serializer->release();
    XMLString::release(&tempFilePath);
    delete formatTarget;
    output->release();
}

解决方案

Are you using Windows Vista? perhaps you don't have the necessary permissions? See this question: Exception in two line Xerces program

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