xmlReaderForMemory crashes on 2nd time call

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C

XML

after making google for long time also, i am unable to find reason/solution for crashing of xmlReaderForMemory,still with valid parameters.

i have created two parser function using libxml2,when i call individually they are working fine.But when i call one after another it is getting crashed on xmlReaderForMemory by giving error s follows:

First-chance exception at 0x7c918fea in nayak.exe: 0xC0000005: Access violation writing location 0x00000010. Unhandled exception at 0x7c918fea in nayak.exe: 0xC0000005: Access violation writing location 0x00000010.

now i am giving the code of the two functions:

FIRST FUNCTION:

char* CB_omniParser(char *omnistring){

  char *parseResult,;
  const char *fileName = omnistring;   
  char *temp,*texttemp,*result=0; 
  int i,len=0,error;
  xmlTextReaderPtr reader;
  len= strlen(omnistring);
   if(len==0)
	   return 0;	
    reader = xmlReaderForMemory(fileName,len,"",NULL,0);	
			
   if(reader){

	  temp = (char *) GlobalAlloc(GPTR, sizeof(char)*len);
	  parseResult = (char *) GlobalAlloc(GPTR,sizeof(char)*len+1);
	  while(error=xmlTextReaderRead(reader)) {
		if(error==-1){				
			return 0; // on failure
		}			
		switch(xmlTextReaderNodeType(reader)) {

		  case XML_READER_TYPE_ELEMENT: 
				
			  temp = (char *)xmlTextReaderConstName(reader);
				strcat(parseResult,temp);					
				strcat(parseResult,"#");	
			    xmlTextReaderMoveToElement(reader);	 					
			    continue;
 
			case XML_READER_TYPE_TEXT:	
				temp = (char *)xmlTextReaderConstValue(reader); 
				strcat(parseResult,temp);							
				strcat(parseResult,"|");							
				continue;				

		}	

	}
	
	xmlFreeTextReader(reader);
	xmlCleanupParser();
	return parseResult;//on success returns the parsed omni string
   }
   else
	return 0; // on failure
}

second function:

char* CB_xmlParserFromMemory(char *xmlstring){
   char *xmlParseresult;	
   char *temp; 
   int i,len,,error;;

   xmlTextReaderPtr reader1;

   len= strlen(xmlstring);
   if(len==0)
	  return 0;
   reader1 = xmlReaderForMemory(xmlstring,len,NULL,NULL,0);
   if(reader1){

	temp = (char *) GlobalAlloc(GPTR, sizeof(char)*len);
	while(error=xmlTextReaderRead(reader1)) {

		if(error==-1){
			return 0; // on failure
		}			
		switch(xmlTextReaderNodeType(reader1)) {

			case XML_READER_TYPE_ELEMENT: 
				
				temp = (char *)xmlTextReaderConstName(reader1);					
				
					strcat(xmlParseresult,"\"");
					strcat(xmlParseresult,temp);
					strcat(xmlParseresult,"\"");
					strcat(xmlParseresult,":");
				
				xmlTextReaderMoveToElement(reader1);	 
				  continue;
 
			case XML_READER_TYPE_TEXT:				
				
				temp = (char *)xmlTextReaderConstValue(reader1); 
				strcat(xmlParseresult,"\"");
				strcat(xmlParseresult,temp);
				strcat(xmlParseresult,"\"");
				strcat(xmlParseresult,",");
			continue;				

		}	

	}		
	  xmlCleanupParser();		
	  xmlFreeTextReader(reader1);		
	  GlobalFree(temp);
	   return xmlParseresult;//on success returns the parsed omni string	
	}
	else
		return 0; // on failure
}

both the functions are working individually fine.but if i call one function after another then both crashes at above given place...ith same error..plz help me.....