Create text file with the name as System date

[maheshnarra]

Hi,

I want to create a text file with the name as SYSTEM DATE...
for example---28/04/2008:9:11:50.txt
The File name should be allocated dynamically.

Can you provide me some details how to write the code for this..

Plese help me.

[donbock]

The first thing you want to do is confirm that a filename of that form is legal for the operating systems that you intend to run your program on.

Step 1: obtain the system date and time in the desired format.

Step 2: create a file with that filename.

Which step are you having trouble with?

[maheshnarra]

hi,
thanks for the reply.
i cant able to understand how to create a file with the file name.
i tried this code.

#include <time.h>
#include<stdio.h>
#include<sys/types.h>
#include<sys/types.h>
#include<fcntl.h>
int main()
{
char s[30];
int fp;
size_t i;
struct tm tim;
time_t now;
now = time(NULL);
tim = *(localtime(&now));
i = strftime(s,30,"%b %d, %Y; %H:%M:%S\n",&tim);
printf("%s\n",s);
}
output of this is
Dec 21, 2010; 10:30:34

i want to open a file like this :
Dec 21, 2010; 10:30:34.txt

Please give me suggestion regarding this.Is it possible to open a file like this?

[johny10151981]

For Some os it is not possible. as Example Windows. You cannot add : to a file name. Cause it is a special character that separates directory from file name

[donbock]

I suggest you use strftime format string "%Y-%m-%dT%H-%M-%S.txt". This avoids troublesome characters (such as ":" and space). It also has the added benefit that an alphabetical listing (such as when you list the contents of a directory) appear in chronological order.

It isn't obvious to me why you terminated your format string with newline.

(I'm suggesting a variant of the W3C DTF standard for date/time strings -- replace colons with dashes and omit the time zone designator.)

By the way, you should confirm that the return code from strftime is nonzero.

[maheshnarra]

Hi,
Thanks for your suggestions.I kept the
strftime format string "%Y-%m-%d T%H-%M-%S.txt" and tried.The output is 2010-12-22T10-20-31.txt
but the text file is not opening in the directory.

[donbock]

How are you trying to open the text file?

[maheshnarra]

I opened a file like this `date +%d-%m-%Y`.txt
I can able to create the file successfully.
Actually i want to append the data from mouse into this file.I got the data from mouse using libusb API and i can print that data.

Please help me how to append the data from mouse into file (20-10-2020.txt).Is it possible to append data into the file if we create a file like this..

Please give me some suggestions regarding this.

thanku

[donbock]

Please show us the C code that opens the file.

[maheshnarra]

thanks for your suggestions.I can able to open the file.I formatted the fopen incorrectly.Now i got it.