David thank you for response my question ,
1. this is core dump stack trace
-- Last Stack Trace
---------------------------------------------------------------
.() at 0x0
XMLString.transcode__Q2_11xercesc_2_89XMLStringFCPCcCPQ2_11xercesc_2_813MemoryManager()
at 0x10108810
InputSource.__ct__Q2_11xercesc_2_811InputSourceFCPCcCPQ2_11xercesc_2_813MemoryManager()
at 0x101afc98
MemBufInputSource.__ct__Q2_11xercesc_2_817MemBufInputSourceFCPCUcCUiCPCcCbCPQ2_11xercesc_2_813MemoryManager()
at 0x102fccfc
bss_ECNS_parseXML.bss_ECNS_parseXML__15BS_PPTManager_iFR25bssObjXMLparse_out_structRC21pptObjCommonIn_structPCcRC28_IDL_SEQUENCE_xmlContextInfoRC22_IDL_SEQUENCE_pptUData(0x3319b4d8,
0x33776108, 0x3378e0f8, 0x34922988, 0x337a8100, 0x337a8110) at 0x1009af10
2. I use while loop for parse xml string , and combine xmlstring
3. In my parse XML function I already defind inline function X for release
XMLString::transcode
class XStr
{
public :
XStr(const char* const toTranscode)
{
fUnicodeForm = XMLString::transcode(toTranscode);
}
~XStr()
{
XMLString::release(&fUnicodeForm);
}
const XMLCh* unicodeForm() const
{
return fUnicodeForm;
}
private :
XMLCh* fUnicodeForm;
};
#define X(str) XStr(str).unicodeForm()
4. mem_controlx is smart point object
for control memory from XMLString::transcode( XML CH * ) return
Best Regards, Sincerely
|--------------------------------->
| David Bertoni |
| <[EMAIL PROTECTED]>|
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| 2008/12/09 上午 09:51|
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| Please respond to |
| [EMAIL PROTECTED]|
| rg |
| |
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Subject|
| Re: MemBufInputSource Core Dump
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>----------------------------------------------------------------------------------------------------------------------|
[EMAIL PROTECTED] wrote:
> Dear Sir :
> I use xerces for parsing XML String , I found some
> question in my test
>
> platform : IBM AIX 5.2
> complier : IBM VA C++
> xerces version : 2-8-0
>
> Q1. xerces can support multi-thread ? ( I found answer
in
> xerces faq from http://xerces.apache.org/xerces-c/faq-parse-3.html#faq-6
)
> need you double confirm
Why do you need confirmation? If you follow the instructions in the
FAQ, you should not have any problems with using Xerces-C in a
multi-threaded application.
>
> Q2. In my function , always core dump in ( new
> MemBufInputSource )
OK, please show us the stack trace for the dump.
> I use C++ while function for test xerces have
memory
> leak
I'm afraid I don't understand what you're saying.
>
> Q3. If I use C++ delete function delete xerces object ,
> why xerces still have memory leak ?
Perhaps the leak is in your code and not in Xerces-C?
>
> Q4. MemBufInputSource have limit usage ?
I'm not sure what you mean by "limit usage." As long as you use the
class correctly, it should work as designed.
>
>
> attach file is my function
>
>
> Source Code
>
=========================================================================================
> try
> {
> XMLPlatformUtils::Initialize();
>
> PPT_METHODTRACE_V1( "" , "================== Now Starting Parse XML
> ==================" ) ;
> string XMLString = (const char * )xmlContextInfoSeq[i].xmlContext ;
I'm not sure why this cast is necessary. What is the type of
xmlContextInfoSeq[i]xmlContext?
> string parseString = "";
> PPT_METHODTRACE_V2( "" , " XMLString :" , XMLString.c_str() );
>
> string bufferId = "prodInfo" ;
> MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager;
> MemoryManager* const manager2 = XMLPlatformUtils::fgMemoryManager;
>
> MemBufInputSource* memBufIS = new MemBufInputSource ((const
> XMLByte*)XMLString.c_str(),
>
> strlen(XMLString.c_str()),
Why not use XMLString.length() here?
>
bufferId.c_str(),
> false,
> manager2
> );
>
> DOMInputSource * inSource = new Wrapper4InputSource(memBufIS,true,
> manager);
You have indicated to Wrapper4InputSource that it owns the object
pointed to by "memBufIS," so it will delete the instance in its destructor.
> DOMImplementation *impl =
> DOMImplementationRegistry::getDOMImplementation(X(""));
>
> DOMBuilder* parser = ((DOMImplementationLS*)impl)->
> createDOMBuilder(DOMImplementationLS::MODE_SYNCHRONOUS, 0);
>
> DOMDocument* xmlDoc;
> xmlDoc = parser->parse(*inSource);
> DOMElement * root = xmlDoc->getDocumentElement();
> DOMNodeList * list = xmlDoc->getElementsByTagName(X("ObjInfo"));
>
> //=============================//
> // XMLSize_t Use Size_t //
> // default start from value 0 //
> //=============================//
> for ( XMLSize_t index_Attr = 0 ; index_Attr < list->getLength() ;
> index_Attr++ )
> {
> DOMElement * elem =
> static_cast<DOMElement*>(list->item(index_Attr)) ;
> string lot_id = "" ;
> string eqp_id = "" ;
> string value = "" ;
>
> objectIdentifier mem_control ;
> const XMLCh * tmpxmlch = elem->getAttribute(X("ObjType"));
> mem_control.identifier = XMLString::transcode(tmpxmlch);
You need to call XMLString::release() on the pointer returned by
XMLString::transcode(). I don't know what the type of
mem_control.identifier is, but this could be a leak.
> value = (const char *)mem_control.identifier ;
Why do you need this cast?
>
> PPT_METHODTRACE_V2( "" , " Objtype value :" , value.c_str() );
>
> if ( value == "Equipment" )
> {
> objectIdentifier mem_control2 ;
> const XMLCh * tmpxmlch2 = elem->getAttribute(X("Value"));
> mem_control2.identifier = XMLString::transcode(tmpxmlch2);
Again, this may be a leak.
> eqp_id = (const char *)mem_control2.identifier;
Again, why do you need this cast?
> PPT_METHODTRACE_V2( "" , " eqp_id :" , eqp_id.c_str() );
> setIDLstring(strObjXMLparse_out.strXMLvalueSeq[i].eqpID ,
> eqp_id ) ;
> PPT_METHODTRACE_V2( "" , "
> strObjXMLparse_out.strXMLvalueSeq[i].eqpID " ,
> strObjXMLparse_out.strXMLvalueSeq[i].eqpID );
> }
> else if ( value == "Lot" )
> {
> objectIdentifier mem_control3 ;
> const XMLCh * tmpxmlch3 = elem->getAttribute(X("Value")) ;
> mem_control3.identifier = XMLString::transcode(tmpxmlch3);
Perhaps another leak.
> lot_id = (const char *)mem_control3.identifier ;
Another strange cast.
> PPT_METHODTRACE_V2( "" , " lot_id :" , lot_id.c_str() );
>
setIDLstring(strObjXMLparse_out.strXMLvalueSeq[i].lotID,lot_id)
> ;
> PPT_METHODTRACE_V2( "" , "
> strObjXMLparse_out.strXMLvalueSeq[i].lotID " ,
> strObjXMLparse_out.strXMLvalueSeq[i].lotID );
> }
>
> }
> delete inSource ;
> delete parser ;
>
> }
> catch (const XMLException& toCatch)
> {
> char* message = XMLString::transcode(toCatch.getMessage());
> PPT_METHODTRACE_V2( "" , "Error during initialization :" , message );
> XMLString::release(&message);
> return 1;
If you return from this path, you will leave the library initialized.
Since you have no other catch handlers, this could be an exception
that's not from the XMLPlatformUtils::Initialize() call.
> }
>
> XMLPlatformUtils::Terminate();
>
> PPT_METHODTRACE_V1( "" , "================== Now Ending Parse XML
> ==================" ) ;
>
>
> Best Regards, Sincerely
>
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