fstream - clobbering

From	ruben safir <ruben@mrbrklyn.com>
Newsgroups	comp.lang.c++
Subject	fstream - clobbering
Date	Mon, 6 Jun 2011 08:16:08 +0000 (UTC)
Organization	PANIX Public Access Internet and UNIX, NYC
Lines	32
Message-ID	<isi2c8$flj$1@reader1.panix.com> (permalink)
NNTP-Posting-Host	www2.mrbrklyn.com
Mime-Version	1.0
Content-Type	text/plain; charset=UTF-8
Content-Transfer-Encoding	8bit
X-Trace	reader1.panix.com 1307348168 16051 96.57.23.82 (6 Jun 2011 08:16:08 GMT)
X-Complaints-To	abuse@panix.com
NNTP-Posting-Date	Mon, 6 Jun 2011 08:16:08 +0000 (UTC)
User-Agent	Pan/0.133 (House of Butterflies)
Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!news.dougwise.org!feed.ac-versailles.fr!news.in2p3.fr!in2p3.fr!kanaga.switch.ch!switch.ch!newsfeed-00.mathworks.com!panix!not-for-mail
Xref	x330-a1.tempe.blueboxinc.net comp.lang.c++:6264

Show key headers only | View raw

I'm trying to figure out why the data file seems to be clobbered




 void Deck::add_questions(Question &enter){
	   //open file
	   Deck tmp;
	   std::ofstream all_quest( tmp.database.c_str(), std::ios::binary );
	   if(!all_quest){
	     std::cerr << "can't open question database for writing" << std::endl;
	     exit(1);
	   }
	   all_quest.seekp( 0, std::ios_base::end);
	   std::cout << "value of enter.quest ============> \n\n" << enter.quest << "Size of string\n" << sizeof(char) *enter.quest.size()  << std::endl;
	   all_quest.write(enter.quest.c_str(), sizeof(char) * enter.quest.size() );
	   all_quest.write(enter.answer.c_str(), sizeof(char) * enter.answer.size() );
	   all_quest.close();
	   return;
	   
   }




I don't think that std::ios::binary clobbers the file and  
all_quest.seekp( 0, std::ios_base::end);

should be setting the the put pos at the end of the file.


Ruben

Back to comp.lang.c++ | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

fstream - clobbering ruben safir <ruben@mrbrklyn.com> - 2011-06-06 08:16 +0000
  Re: fstream - clobbering ruben safir <ruben@mrbrklyn.com> - 2011-06-06 06:10 -0400

csiph-web