我编写了以下函数来使用 Xerces 3.0.1 创建 XML 文件,如果我使用“foo.xml”或“../foo.xml”的文件路径调用此函数,它会很好用,但如果我传入“c:/foo.xml”然后我在这一行得到一个异常
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,但不适用于绝对路径吗?
非常感谢。
const int ABSOLUTE_PATH_FILENAME_PREFIX_SIZE = 9;
void OutputXML(xercesc::DOMDocument* pmyDOMDocument, std::string filePath)
{
//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();
}
您的文件路径似乎不正确。它应该是 file:///C:/。请参阅以下内容了解更多信息:
http://en.wikipedia.org/wiki/File_URI_scheme http://en.wikipedia.org/wiki/File_URI_scheme
UPDATE:以下代码适用于 Visual Studio 2008。使用您的代码以及 Xerces 附带的一些示例,这是一个快速破解。
#include <windows.h>
#include <iostream>
#include <string>
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/dom/DOM.hpp>
#include <xercesc/util/OutOfMemoryException.hpp>
#include <xercesc/framework/XMLFormatter.hpp>
#include <xercesc/framework/LocalFileFormatTarget.hpp>
#include <xercesc/dom/DOMDocument.hpp>
#include <xercesc/dom/DOMImplementation.hpp>
#include <xercesc/dom/DOMImplementationRegistry.hpp>
#include <xercesc/dom/DOMLSSerializer.hpp>
#include <xercesc/dom/DOMLSOutput.hpp>
using namespace xercesc;
using namespace std;
void OutputXML(xercesc::DOMDocument* pmyDOMDocument, std::string filePath);
class XStr
{
public :
XStr(const char* const toTranscode)
{
// Call the private transcoding method
fUnicodeForm = XMLString::transcode(toTranscode);
}
~XStr()
{
XMLString::release(&fUnicodeForm);
}
const XMLCh* unicodeForm() const
{
return fUnicodeForm;
}
private :
XMLCh* fUnicodeForm;
};
#define X(str) XStr(str).unicodeForm()
int _tmain(int argc, _TCHAR* argv[])
{
try
{
XMLPlatformUtils::Initialize();
}
catch(const XMLException& e)
{
char* message = XMLString::transcode(e.getMessage());
cout << "Error Message: " << message << "\n";
XMLString::release(&message);
return 1;
}
int errorCode = 0;
{
DOMImplementation* impl = DOMImplementationRegistry::getDOMImplementation(X("Core"));
if (impl != NULL)
{
try
{
DOMDocument* doc = impl->createDocument(
0, // root element namespace URI.
X("company"), // root element name
0); // document type object (DTD).
DOMElement* rootElem = doc->getDocumentElement();
DOMElement* prodElem = doc->createElement(X("product"));
rootElem->appendChild(prodElem);
DOMText* prodDataVal = doc->createTextNode(X("Xerces-C"));
prodElem->appendChild(prodDataVal);
DOMElement* catElem = doc->createElement(X("category"));
rootElem->appendChild(catElem);
catElem->setAttribute(X("idea"), X("great"));
DOMText* catDataVal = doc->createTextNode(X("XML Parsing Tools"));
catElem->appendChild(catDataVal);
DOMElement* devByElem = doc->createElement(X("developedBy"));
rootElem->appendChild(devByElem);
DOMText* devByDataVal = doc->createTextNode(X("Apache Software Foundation"));
devByElem->appendChild(devByDataVal);
OutputXML(doc, "C:/Foo.xml");
doc->release();
}
catch (const OutOfMemoryException&)
{
XERCES_STD_QUALIFIER cerr << "OutOfMemoryException" << XERCES_STD_QUALIFIER endl;
errorCode = 5;
}
catch (const DOMException& e)
{
XERCES_STD_QUALIFIER cerr << "DOMException code is: " << e.code << XERCES_STD_QUALIFIER endl;
errorCode = 2;
}
catch(const XMLException& e)
{
char* message = XMLString::transcode(e.getMessage());
cout << "Error Message: " << message << endl;
XMLString::release(&message);
return 1;
}
catch (...)
{
XERCES_STD_QUALIFIER cerr << "An error occurred creating the document" << XERCES_STD_QUALIFIER endl;
errorCode = 3;
}
} // (inpl != NULL)
else
{
XERCES_STD_QUALIFIER cerr << "Requested implementation is not supported" << XERCES_STD_QUALIFIER endl;
errorCode = 4;
}
}
XMLPlatformUtils::Terminate();
return errorCode;
}
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());
// Specify the target for the XML output.
XMLFormatTarget *formatTarget = new LocalFileFormatTarget(tempFilePath);
// 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();
}
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