* RE: Probably a very simple problem - hopefully someone will help me
@ 2001-07-23 14:45 Heribert Dahms
2001-07-23 17:07 ` Kurt Roeckx
0 siblings, 1 reply; 5+ messages in thread
From: Heribert Dahms @ 2001-07-23 14:45 UTC (permalink / raw)
To: 'Kurt Roeckx'; +Cc: cygwin
Hi Kurt,
almost! According to Appendix A of Richard W. Steven's famous
"Advanced Programming in the UNIX Environment" (a "must have" IMHO)
lseek needs including <sys/types.h> before <unistd.h>!
Bye, Heribert (heribert_dahms@icon-gmbh.de)
> -----Original Message-----
> From: Kurt Roeckx [SMTP:Q@ping.be]
> Sent: Monday, July 23, 2001 17:23
> To: cygwin@cygwin.com
> Cc: cygwin@cygwin.com
> Subject: Re: Probably a very simple problem - hopefully someone will
> help me
>
> On Sun, Jul 22, 2001 at 09:51:07PM +0100, David Ayliffe wrote:
> >
> > I get these errors when I compile using the command directly below
> >
> > $ gcc byte_hacking.cpp
> > byte_hacking.cpp: In function 'int main():
> > byte_hacking.cpp:20 implicit declaration of function 'int lseek(...)'
> > byte_hacking.cpp:22 implicit declaration of function 'int read(...)'
> > byte_hacking.cpp:27 implicit declaration of function 'int write(...)'
> > byte_hacking.cpp:25 implicit declaration of function 'int close(...)'
>
> They're not errors, they're warnings.
>
> > //Gets records from a MS Access Database
> >
> > #include <io.h>
> > #include <fcntl.h>
> > #include <stdio.h>
> > #include <sys\stat.h>
>
> It should be <sys/stat.h>, and you forgot: #include <unistd.h>
> which declares all of those functions.
>
>
> Kurt
>
>
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Probably a very simple problem - hopefully someone will help me
@ 2001-07-22 13:53 David Ayliffe
2001-07-22 14:04 ` edward
2001-07-23 8:23 ` Kurt Roeckx
0 siblings, 2 replies; 5+ messages in thread
From: David Ayliffe @ 2001-07-22 13:53 UTC (permalink / raw)
To: cygwin
[-- Attachment #1: Type: text/plain, Size: 2107 bytes --]
Hello and thanks for your time.
I have been subscribed to this list now for 1824 posts but this is my
first post.
I have a file (attached) which I can't compile under cygwin using gcc.
Is it possible for this file to be compiled using cygwin, and if so can
you point me to where I am going wrong? Sorry if this is a REALLY dolly
question but we all start somewhere. PS This code compiles fine under
VC6.
I get these errors when I compile using the command directly below
$ gcc byte_hacking.cpp
byte_hacking.cpp: In function 'int main():
byte_hacking.cpp:20 implicit declaration of function 'int lseek(...)'
byte_hacking.cpp:22 implicit declaration of function 'int read(...)'
byte_hacking.cpp:27 implicit declaration of function 'int write(...)'
byte_hacking.cpp:25 implicit declaration of function 'int close(...)'
Thanks lots
David Ayliffe (mail@ayliffe.com)
Running Windows 2000 Advanced Server (SP2) with Cygwin gcc 2.95.3-5
Also running Suse Linux 7.1 Professional kernel 2.4
<ATTATCHED CODE FOR THOSE WHO CANT BE BOTHERED TO OPEN THE ATTACHMENT>
//Gets records from a MS Access Database
#include <io.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys\stat.h>
//#define database = northwind.mdb;
int main ()
{
int f,buf;
int isuccess = 0;
printf ("Lists records in database\n");
printf ("**************************\n\n");
if (chmod("northwind.mdb",S_IWRITE)!=-1 && (f=open
("northwind.mdb",O_RDWR | O_BINARY))!=-1)
{
//handle, offest, origin
if (lseek (f,0,SEEK_SET)!=1)
{
if (read (f,&buf,2)==2 && buf==0x037D)
{
printf ("Reading records");
lseek (f,346345,SEEK_SET);
buf=0x9090; //nop nop
if (write(f,&buf,2)==2)
{
printf ("Success.");
}
else
{
printf ("Failed due to unknown
reason.");
}
}
else
{
printf("Cannot find start location.
File may not be .mdb file");
}
}
else
{
printf("Seek error.");
}
close(f);
}
else
{
printf ("Cannot find northwind.mdb");
}
return isuccess;
}
<END OF ATTATCHED CODE FOR THOSE WHO CANT BE BOTHERED TO OPEN THE
ATTACHMENT>
[-- Attachment #2: byte_hacking.cpp --]
[-- Type: text/x-c, Size: 964 bytes --]
//Gets records from a MS Access Database
#include <io.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys\stat.h>
#define database = northwind.mdb;
int main ()
{
int f,buf;
int isuccess = 0;
printf ("Lists records in database\n");
printf ("**************************\n\n");
if (chmod("northwind.mdb",S_IWRITE)!=-1 && (f=open ("northwind.mdb",O_RDWR | O_BINARY))!=-1)
{
//handle, offest, origin
if (lseek (f,0,SEEK_SET)!=1)
{
if (read (f,&buf,2)==2 && buf==0x037D)
{
printf ("Reading records");
lseek (f,346345,SEEK_SET);
buf=0x9090; //nop nop
if (write(f,&buf,2)==2)
{
printf ("Success.");
}
else
{
printf ("Failed due to unknown reason.");
}
}
else
{
printf("Cannot find start location. File may not be .mdb file");
}
}
else
{
printf("Seek error.");
}
close(f);
}
else
{
printf ("Cannot find northwind.mdb");
}
return isuccess;
}
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2001-07-23 17:07 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2001-07-23 14:45 Probably a very simple problem - hopefully someone will help me Heribert Dahms
2001-07-23 17:07 ` Kurt Roeckx
-- strict thread matches above, loose matches on Subject: below --
2001-07-22 13:53 David Ayliffe
2001-07-22 14:04 ` edward
2001-07-23 8:23 ` Kurt Roeckx
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