But if you read the MSDN page on fopen() that's exactly what the "wb" parameter should prevent, but it still doesn't do what it's supposed to do. The resulting file is identical if you open with "w", "wt" or "wb".
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Question
fopen ("file", "wb") still writes cf-lf text files in VS2005
Using Visual Studio 2005 in pure C (no C++) I have problems with writing a binary file using fopen() and fputc(). Here is my little test program:
int main (int argc, char* argv[])
{
FILE *fp;
fp = fopen ("crlf.tmp", "wb");
fwrite ("abc\n", 1, 4, fp);
fputc ('x', fp);
fputc ('y', fp);
fputc ('z', fp);
fputc ('\n', fp);
fclose (fp);
return 0;
}
When you look at the resulting file in a hex editor, in both cases the linefeeds are translated into a CR-LF pair. Which would be OK if the file was opened as default or as a text-file but not when it is opened in binary mode.
This has for me been an ongoing problem. Last time I circumvented it by replacing my C-style file I/O with MS specific calls like CreateFile() and ReadFile(). But this time I prefer to solve the problem "once and for all". :) Also I need this code to be platform independent and this problem doesn't occur on my Unix systems.
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Answers
Well, the warnings depend on the type of project. If I created an empty project, and pasted in my code, I got no warnings at all Did this test after my origianl post.
At first, I created a Win32 console app with a sample application. Which generates one of those stdafx projects. It's never been clear to me what that stuff is doing, but anyway, in that case it complains about a lot more security related stuff which you can solve with this pre-compiler marcro.
But I only mentioned this to be complete. I don't think it's related. I just started from scratch with a "create empty project", built the app, no warnings whatsoever, and still each linefeed gets translated into a "cr-lf". Go figure ..... :-)
I ran the same code in a cpp win32 console project, no compile errors and it generated a the file without any CR only the LF character.
What hex tool did you use to see if there are any CR's in the file? The resulting filesize is 8 bytes. What do you see as the filesize? (6 bytes for the printable ascii and two newlines).
Anthony, seems you nailed it.
To view the Hex code, I opened the file in UltraEdit and then switched to HEX mode. Seems that UE is first converting the LF's into CR-LF's (I presume that's configurable :-) while reading in the file.
I ftp-ed the file to a Unix box (in binary mode) and used 'od -x' to verify. Indeed no CRs that way.
Thanks,
Willem
>> Seems that UE is first converting the LF's into CR-LF's
That's indeed what UE does (you should get a pop-up asking whether you want to convert the file to DOS format - if you click OK, it will do this replacement).
There are several hex editors for Windows that don't have this "problem", as long as you pick one that is advertised as a hex editor. UltraEdit is a text editor that just happens to have a hex functionality, but it is first and foremost a test editor.
In Windows, I have been using frhed. http://www.codeproject.com
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by: avizitPosted on 2007-08-07 at 19:50:14ID: 19651072
This is prolly because newline in win machines are translated as CR-LF pair.
on unix machines you can usually convert the file to use only \n using the dos2unix command if available
dos2unix filename