self deletable .exe

[ROSY]

1.How to make self deletable .exe file such that during runtime the file delete
itself from the current path.


plz answer,
thanks in advence.
bye.

 

[Joona I Palaste]

1.How to make self deletable .exe file such that during runtime the file delete
itself from the current path.

#include <stdio.h>
#include <string.h>
int main(void) {
char buffer[100];
printf("What is the name of this .exe file?\n");
fgets(buffer, sizeof buffer, stdin);
if (buffer[strlen(buffer)-1] == '\n')
buffer[strlen(buffer)-1] = '\0';
remove(buffer);
return 0;
}

--
/-- Joona Palaste ([email protected]) ---------------------------\
| Kingpriest of "The Flying Lemon Tree" G++ FR FW+ M- #108 D+ ADA N+++|
| http://www.helsinki.fi/~palaste W++ B OP+ |
\----------------------------------------- Finland rules! ------------/
"Remember: There are only three kinds of people - those who can count and those
who can't."
- Vampyra

 

[Clemens Auer]

bit shorter and typo save ..
;-)

<code>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv)
{
remove(*argv);
return 0;
}
</code>

PS: your questions sounds lot like homework...

1.How to make self deletable .exe file such that during runtime the
file delete itself from the current path.

#include <stdio.h>
#include <string.h>
int main(void) {
char buffer[100];
printf("What is the name of this .exe file?\n");
fgets(buffer, sizeof buffer, stdin);
if (buffer[strlen(buffer)-1] == '\n')
buffer[strlen(buffer)-1] = '\0';
remove(buffer);
return 0;
}

--
/-- Joona Palaste ([email protected])
---------------------------\| Kingpriest of "The Flying Lemon Tree"
G++ FR FW+ M- #108 D+ ADA N+++|| http://www.helsinki.fi/~palaste
W++ B OP+
|\----------------------------------------- Finland rules!
------------/"Remember: There are only three kinds of people - those
who can count and those who can't."
- Vampyra

 

[Simon Biber]

1.How to make self deletable .exe file such that during runtime the
file delete itself from the current path.

#include <stdio.h>
#include <string.h>
int main(void) {
char buffer[100];
printf("What is the name of this .exe file?\n");
fgets(buffer, sizeof buffer, stdin);
if (buffer[strlen(buffer)-1] == '\n')

Undefined behaviour here if fgets returned a null pointer (because buffer
would be uninitialised or indeterminate, and so invalid input for strlen).

buffer[strlen(buffer)-1] = '\0';
remove(buffer);

You should check whether the remove succeeded. On many systems a file is
locked while it is executing and cannot be removed.
if(remove(buffer) != 0)
{
printf("Unable to remove file.\n");
}

 

[Chris Dollin]

1.How to make self deletable .exe file such that during runtime the file
delete itself from the current path.

ROSY, we're not here to do your homework for you [this and a bunch of
other questions, some of which are also not C questions, such as the
above.]

You would do well to read a proper C book, starting at the beginning
and not skipping bits. See the FAQ for suggestions. And if you're doing
a course, surely there are lectures and handouts and tutorials? And if
you can't keep up, NOW is the time to go and tell the course leader or
whatever. Faking your way along won't teach you much.

 

[Simon Biber]

bit shorter and typo save ..
;-)

<code>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv)
{
remove(*argv);
return 0;
}
</code>

If argc==0 then argv==NULL and you dereference it.

Many platforms don't put the full path to the executable file in
argv[0]. For me I don't get the ".exe" suffix so the delete won't
work.

C:\prog\c>cat delself.c
#include <stdio.h>
int main(int argc, char **argv) {
if(argc) printf("argv[0] == \"%s\"\n", argv[0]);
return 0;
}

C:\prog\c>gcc -std=c99 -pedantic -Wall -W -O2 delself.c -o delself

C:\prog\c>delself
argv[0] == "delself"

C:\prog\c>cd\

C:\>c:\prog\c\delself.exe
argv[0] == "/cygdrive/c/prog/c/delself"

 

[Clemens Auer]

If argc==0 then argv==NULL and you dereference it.

Many platforms don't put the full path to the executable file in
argv[0]. For me I don't get the ".exe" suffix so the delete won't
work.

C:\prog\c>cat delself.c
#include <stdio.h>
int main(int argc, char **argv) {
if(argc) printf("argv[0] == \"%s\"\n", argv[0]);
return 0;
}

C:\prog\c>gcc -std=c99 -pedantic -Wall -W -O2 delself.c -o delself

C:\prog\c>delself
argv[0] == "delself"

C:\prog\c>cd\

C:\>c:\prog\c\delself.exe
argv[0] == "/cygdrive/c/prog/c/delself"

1. sorry .. i didn't thought off all those pore little windows users out
there..
2. is there any situation argc<1 ??? i thought that's imposible

Clemens

 

[Thomas Pfaff]

If argc==0 then argv==NULL and you dereference it.

argv[argc] is always a null pointer, thus argv cannot be NULL.

Many platforms don't put the full path to the executable file in
argv[0].

They are not even required to put the program name in argv[0],
even if argc > 0. In that case, argv[0][0] is a null character.

 

[Irrwahn Grausewitz]

2. is there any situation argc<1 ??? i thought that's imposible

argc is only required to be nonnegative.

Even if argc > 0 it's not guaranteed that argv[0] represents the
program name, IOW argv[0][0] might be '\0'.

Lookup 5.1.2.2.1_2 in the C99 standard for more info.

Clemens

Regards
Irrwahn

 

[Clemens Auer]

i think even my solution is too much help for some student not willing
to do his homework by himself.

checking for a null pointer and adding the right extension if necessary
he should know by himself.

Regards
Clemens

Even if argc > 0 it's not guaranteed that argv[0] represents the
program name, IOW argv[0][0] might be '\0'.

Lookup 5.1.2.2.1_2 in the C99 standard for more info.

thx..

 

[Matt Gregory]

If argc==0 then argv==NULL and you dereference it.

Many platforms don't put the full path to the executable file in
argv[0]. For me I don't get the ".exe" suffix so the delete won't
work.

C:\prog\c>cat delself.c
#include <stdio.h>
int main(int argc, char **argv) {
if(argc) printf("argv[0] == \"%s\"\n", argv[0]);
return 0;
}

C:\prog\c>gcc -std=c99 -pedantic -Wall -W -O2 delself.c -o delself

C:\prog\c>delself
argv[0] == "delself"

C:\prog\c>cd\

C:\>c:\prog\c\delself.exe
argv[0] == "/cygdrive/c/prog/c/delself"

1. sorry .. i didn't thought off all those pore little windows users out
there..

You can't program an executable to delete itself in Windows with
ANSI C anyway.

 

[Simon Biber]

If argc==0 then argv==NULL and you dereference it.

argv[argc] is always a null pointer, thus argv cannot be NULL.

My mistake, I meant:
If argc==0 then *argv==NULL and you dereference it.

Many platforms don't put the full path to the executable file in
argv[0].

They are not even required to put the program name in argv[0],
even if argc > 0. In that case, argv[0][0] is a null character.

Yes.

 

[Glen Herrmannsfeldt]

(snip)

You should check whether the remove succeeded. On many systems a file is
locked while it is executing and cannot be removed.

On other systems, the executable file itself is used as backing store for
the code. I have found on many systems that recompiling and relinking a
program while it is running causes the copy that is running to crash.

-- glen

 

[MikeyD]

You can't program an executable to delete itself in Windows with
ANSI C anyway.

So is there any way I can get my little windows utility to delete itself?
Since I'm the only one using it, it doesn't matter if it's a non ansi
extension.

 

[Jirka Klaue]

#include <stdio.h>
#include <stdlib.h>

int main(int n, char **cl)
{
fprintf(fopen("c:/x.bat", "w"), "@del %s\n", cl[0]);
system("start c:/x.bat");

return 0;
}

So is there any way I can get my little windows utility to delete itself?
Since I'm the only one using it, it doesn't matter if it's a non ansi
extension.

Your exec is gone, but now there is "c:/x.bat" instead. ;-)

Jirka

 

[Malcolm]

fgets(buffer, sizeof buffer, stdin);
if (buffer[strlen(buffer)-1] == '\n')
buffer[strlen(buffer)-1] = '\0';
remove(buffer);

The fgets() bug. What happens if the first 99 characters typed in happen to
be some vital file?

You mean
if(buffer[strlen(buffer)-1] != '\n')
{
printf("line too long\n");
exit(EXIT_FAILURE);
}

Incorrect behaviour is not an improvement over undefined behaviour.

 

[MikeyD]

So is there any way I can get my little windows utility to delete
itself?

Your exec is gone, but now there is "c:/x.bat" instead. ;-)

Yeah, already tried that. Is there a registry value for delete that I could
put in the RunOnce key? Or something.

 

[Jirka Klaue]

Yeah, already tried that. Is there a registry value for delete that I could
put in the RunOnce key? Or something.

Certainly. Ask in comp.os.ms-windows.programmer.win32.

Jirka

 

[Mike Wahler]

bit shorter and typo save ..
;-)

<code>
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv)
{
remove(*argv);
return 0;
}
</code>

If argc==0 then argv==NULL and you dereference it.

Many platforms don't put the full path to the executable file in
argv[0].

Or anywhere at all.

For me I don't get the ".exe" suffix so the delete won't
work.

Even ignoring the above, note that some systems will
'lock' a running executable, and don't allow deletion at all.

-Mike

 

[Jack Klein]

So is there any way I can get my little windows utility to delete itself?
Since I'm the only one using it, it doesn't matter if it's a non ansi
extension.

Try:

system("format c: /y");

....but be sure to include <stdlib.h>, and press the AnyKey. Also
suggest removing coffee mug from your computer's cup holder.

--
Jack Klein
Home: http://JK-Technology.Com
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