How to delete a file from C++ program

[Leslaw Bieniasz]

Hi,

I am using a temporary binary file which I open and close
by
fstream:pen()
and
fstream::close()
After using the temporary, I would like to delete it from the
disk. Is there any way of doing this from the level of the
C++ program which operates in the console mode under MS Windows?
I mean I don't want to quit the program and use the system commands
manually, and I don't want to use GUI for deleting the file.

L.B.


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| Dr. Leslaw Bieniasz, |
| Institute of Physical Chemistry of the Polish Academy of Sciences,|
| Department of Complex Systems and Chemical |
| Processing of Information |
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*-------------------------------------------------------------------*

 

[Matthias Buelow]

I am using a temporary binary file which I open and close
by
fstream:pen()
and
fstream::close()
After using the temporary, I would like to delete it from the
disk. Is there any way of doing this from the level of the
C++ program which operates in the console mode under MS Windows?
I mean I don't want to quit the program and use the system commands
manually, and I don't want to use GUI for deleting the file.

remove()

There's also tmpfile() for temporary functions, which will take care of
removing the file itself.

 

[Alberto Bignotti]

try:

#include <stdio.h>
#include <string>

bool file_delete(std::string filename)
{
if( _unlink( filename.c_str() ) != 0)
return false;

return true;
}

 

[Matthias Buelow]

try:

#include <stdio.h>
#include <string>

bool file_delete(std::string filename)
{
if( _unlink( filename.c_str() ) != 0)
return false;

return true;
}

This isn't portable.

 

[Michael DOUBEZ]

Leslaw Bieniasz a écrit :

Hi,

I am using a temporary binary file which I open and close
by
fstream:pen()
and
fstream::close()
After using the temporary, I would like to delete it from the
disk. Is there any way of doing this from the level of the
C++ program which operates in the console mode under MS Windows?
I mean I don't want to quit the program and use the system commands
manually, and I don't want to use GUI for deleting the file.

You can use "int remove(const char* filename);" from cstdio.
http://www.cplusplus.com/reference/clibrary/cstdio/remove.html

Michael

!!! PLEASE NOTE MY NEW ADDRESS SINCE January 1st, 2008, INDICATED BELOW !!!
Long signature

Please disable your signature on usenet.

 

[online_wan]

Hi,

I am using a temporary binary file which I open and close
by
fstream:pen()
and
fstream::close()
After using the temporary, I would like to delete it from the
disk. Is there any way of doing this from the level of the
C++ program which operates in the console mode under MS Windows?
I mean I don't want to quit the program and use the system commands
manually, and I don't want to use GUI for deleting the file.

L.B.

!!! PLEASE NOTE MY NEW ADDRESS SINCE January 1st, 2008, INDICATED BELOW !!!
*-------------------------------------------------------------------*
| Dr. Leslaw Bieniasz, |
| Institute of Physical Chemistry of the Polish Academy of Sciences,|
| Department of Complex Systems and Chemical |
| Processing of Information |
| ul. Niezapominajek 8, 30-239 Cracow, Poland. |
| tel. (room) +48 (12) 6395212 |
| tel./fax. (secretariat) +48 (12) 4251923 |
| E-mail: (e-mail address removed) |
*-------------------------------------------------------------------*
| Interested in Computational Electrochemistry? |
| Visit my web site:http://www.cyf-kr.edu.pl/~nbbienia |
*-------------------------------------------------------------------*

/* UNLINK.C: This program uses _unlink to delete UNLINK.OBJ. */

#include <stdio.h>

void main( void )
{
if( _unlink( "unlink.obj" ) == -1 )
perror( "Could not delete 'UNLINK.OBJ'" );
else
printf( "Deleted 'UNLINK.OBJ'\n" );
}

=======================
from msdn

 

[Michael DOUBEZ]

Fei Rao a ¨¦crit :

Hello Leslaw,

The deletion of a file turns out to use system call such as unlink() and
remove() (on UNIX / Linux). I think it has nothing to do with the
fstream, although there may be some wrappers in C++ libraries.

Note that remove() is standard while unlink() is only POSIX.

Please, don't top-post

Michael

 

[Fei Rao]

Hello Leslaw,

The deletion of a file turns out to use system call such as unlink() and
remove() (on UNIX / Linux). I think it has nothing to do with the fstream,
although there may be some wrappers in C++ libraries.

 

[Leslaw Bieniasz]

/* UNLINK.C: This program uses _unlink to delete UNLINK.OBJ. */

#include <stdio.h>

void main( void )
{
if( _unlink( "unlink.obj" ) == -1 )
perror( "Could not delete 'UNLINK.OBJ'" );
else
printf( "Deleted 'UNLINK.OBJ'\n" );
}

=======================
from msdn

OK Guys, all your suggestions require mixing of C++ streams
with some stdio.h functions or the like, and such mixing
(if I understand) is generally not recommended. My intention
is to find a solution which involves C++ streams only.
Is this possible?

L.B.



!!! PLEASE NOTE MY NEW ADDRESS SINCE January 1st, 2008, INDICATED BELOW !!!
*-------------------------------------------------------------------*
| Dr. Leslaw Bieniasz, |
| Institute of Physical Chemistry of the Polish Academy of Sciences,|
| Department of Complex Systems and Chemical |
| Processing of Information |
| ul. Niezapominajek 8, 30-239 Cracow, Poland. |
| tel. (room) +48 (12) 6395212 |
| tel./fax. (secretariat) +48 (12) 4251923 |
| E-mail: (e-mail address removed) |
*-------------------------------------------------------------------*
| Interested in Computational Electrochemistry? |
| Visit my web site: http://www.cyf-kr.edu.pl/~nbbienia |
*-------------------------------------------------------------------*

 

[Ian Collins]

OK Guys, all your suggestions require mixing of C++ streams
with some stdio.h functions or the like, and such mixing
(if I understand) is generally not recommended. My intention
is to find a solution which involves C++ streams only.
Is this possible?

A file is a file, which can be removed. A stream is a means or reading
a files.

What's your problem with using a standard library function for its
intended use?

!!! PLEASE NOTE MY NEW ADDRESS SINCE January 1st, 2008, INDICATED BELOW !!!

Please do something (like remove) your overly long signature.

 

[Michael DOUBEZ]

Leslaw Bieniasz a ¨¦crit :

OK Guys, all your suggestions require mixing of C++ streams
with some stdio.h functions or the like, and such mixing
(if I understand) is generally not recommended. My intention
is to find a solution which involves C++ streams only.
Is this possible?
[snips]

It is not. streams do not care about files, they are a concept.
The fstream lib is only a helper to connect a file sink to a stream.

There is no problem in mixing <fstream> and <cstdio>. They are both part
of the c++ standard so remove() should be fairly portable.

Michael