netsnmptrapd 's win32 c++ language's problem

Hello..
   
   I download netsnmp5.2.2 release version..and I did following things

   <1> modify libsnmptrapd's snmptrapd.c file
          a> delete #define WIN32SERVICE line(I don't want to use windows 
service)
          b> delete main function (excluding collision)
          c> compile and link libsnmptrapd(use windows vc++6.0, following 
all the same)
   <2> modify snmptrapd program's snmptrapd.c filename to snmptrapd.cpp
   <3> add extern "C" to some function declaration(for avoid link error)
   <4> compile and link snmptrapd pragram

    but when I run my new snmptrapd program, the problems come out:
         a> when my snmptrapd open for about 5minutes, it couldn't receive 
trap messages anymore, I debugged this problem, I found the block reason is 
for snmp_logging.c's log_handler_stdouterr's "printf" funtion, when the 
code excute to printf line, it block, and no action..
         b>at above circumstances, when I press "ctrl+c", it could print 
last message


    could someone tell me why?? does my porting has error?? or netsnmp's 
trapd has some error??
    
     expert my question's answer...................;-)


Best Regards
Anders

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