How to combine string

[Frank Hung]

Dear all,
I want to create file, of which name is [current date+".log"].
But i do not know how to do. My sample code is shown as bellow:

... sprintf(buf2,"%d/%d/%d %d:%d:%d",
tims->tm_mon+1,
tims->tm_mday,
tims->tm_year+1900,
tims->tm_hour,
tims->tm_min,
tims->tm_sec);

f=fopen(buf2,"a"); /* open log */->will create file "2003-10-27"

But i want to create file, "2003-10-27.log".
Can anyone teach me how to do?

[Thomas Pfaff]

fr********@qdi.com.tw (Frank Hung) writes:

Dear all,
I want to create file, of which name is [current date+".log"].
But i do not know how to do. My sample code is shown as bellow:

... sprintf(buf2,"%d/%d/%d %d:%d:%d",
tims->tm_mon+1,
tims->tm_mday,
tims->tm_year+1900,
tims->tm_hour,
tims->tm_min,
tims->tm_sec);
See strftime in <time.h>.
f=fopen(buf2,"a"); /* open log */->will create file "2003-10-27"
But i want to create file, "2003-10-27.log".

You can strcpy ".log" to buf2 before calling fopen.

[Alex]

"Frank Hung" <fr********@qdi.com.tw> wrote in message
news:e3**************************@posting.google.c om...

Dear all,
I want to create file, of which name is [current date+".log"].
But i do not know how to do. My sample code is shown as bellow:

... sprintf(buf2,"%d/%d/%d %d:%d:%d",
tims->tm_mon+1,
tims->tm_mday,
tims->tm_year+1900,
tims->tm_hour,
tims->tm_min,
tims->tm_sec);

f=fopen(buf2,"a"); /* open log */->will create file "2003-10-27"
Not according to the format in the sprintf call.
But i want to create file, "2003-10-27.log".
Can anyone teach me how to do?

Just specify the appropriate format in the call to sprintf:

sprintf(buf2, "%4d-%02d-%02d.log", tims->tm_year + 1900,
tims->tm_mon + 1, tims->tm_mday);
f = fopen(buf2, "a");

Better still, use strftime() in much the same way.

[Irrwahn Grausewitz]

Thomas Pfaff <th**********@tiscali.no> wrote:

fr********@qdi.com.tw (Frank Hung) writes:

Dear all,
I want to create file, of which name is [current date+".log"].
But i do not know how to do. My sample code is shown as bellow:

... sprintf(buf2,"%d/%d/%d %d:%d:%d",
tims->tm_mon+1,
tims->tm_mday,
tims->tm_year+1900,
tims->tm_hour,
tims->tm_min,
tims->tm_sec);

See strftime in <time.h>.

f=fopen(buf2,"a"); /* open log */->will create file "2003-10-27"
But i want to create file, "2003-10-27.log".

You can strcpy ".log" to buf2 before calling fopen.

Better use strcat. ;-)
Or append ".log" to the sprintf format string.

Regards
--
Irrwahn
(ir*******@freenet.de)

[Thomas Pfaff]

Irrwahn Grausewitz <ir*******@freenet.de> writes:

Thomas Pfaff <th**********@tiscali.no> wrote:

You can strcpy ".log" to buf2 before calling fopen.

Better use strcat. ;-)

Since strftime returns the number of characters written to the destination,
you might aswell use strcpy and save the time needed to discover something
you already know.

But I won't claim this is what I had in mind in my first post. I did mean
to write strcat ;-) Thanks.