From: colin AT bird DOT fu DOT is DOT saga-u DOT ac DOT jp (Colin Peters) Subject: RE: fread/fwrite problems in b18 3 Jun 1997 09:49:50 -0700 Approved: cygnus DOT gnu-win32 AT cygnus DOT com Distribution: cygnus Message-ID: <01BC7027.115BDE00.cygnus.gnu-win32@gbird0> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8bit Original-To: "'Bala Amavasai'" Original-Cc: "'GNU-Win32'" X-MIME-Autoconverted: from quoted-printable to 8bit by cygnus.com id WAA10108 Original-Sender: owner-gnu-win32 AT cygnus DOT com Bala Amavasai[SMTP:B DOT Amavasai AT sheffield DOT ac DOT uk] wrote: >Hi! I wonder if anyone can help. I've written a short program to remove a >fix sized header (of 512 bytes) from a raw image file. However when I >compile it and run under gcc b18, I do not get the output I expect. That >is the output file size is always 30 bytes. The same code compiles and >works perfectly in Solaris 2.4 and Linux 2.0.27. The truncated version of >the code is fowarded below. See below, it's a binary vs. text problem. >Another problem which I'm facing is that when I allocate a large array, >say 1000x1000 and when I read and write data to/off it, I get junk towards >1/4 way into the array. Once again the same code works very well in the >platforms above. Is there a problem with memory allocation? I'll send a >truncated piece of code later, unless the problem has been previously >logged. I've never heard of this and would be interested to know the specifics. > /* image file */ > if ((infile=fopen(argv[1],"r"))==NULL) Change to fopen(argv[1],"rb"). Files are opened by default in text mode, which is, unfortunately, not the same as binary on win32 machines (and yes there has been a lot of arguing back and forth about what GNU-Win32 should do about it). If you open your files in binary mode then it should work on both UNIX and Win32. > /* create temp file */ > if ((outfile=fopen("outfile","w"))==NULL) Change to fopen("outfile","wb") as above. -- Colin Peters - colin AT bird DOT fu DOT is DOT saga-u DOT ac DOT jp -- Saga University Dept. of Information Science -- http://www.fu.is.saga-u.ac.jp/~colin/index.html -- http://www.geocities.com/Tokyo/Towers/6162/ - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request AT cygnus DOT com" with one line of text: "help".