Linux fwrite () use method, the current time to write the program of the text

fwrite function

1. function function

Used to read and write a data block.

2. General Invocation Form

Fwrite (BUFFER,SIZE,COUNT,FP);

3. Description

(1) Buffer: is a pointer to Fread, which is the storage address of the read-in data. For Fwrite, the address of the data to be output.

(2) Size: The number of bytes to read and write;

(3) Count: The number of bytes of data to read and write;

(4) FP: file-Type pointer

This is an example of working with fwrite function, not only to record their own learning situation, but also to share to friends this fwrite function instance.

This fwrite instance is the program that writes the text at the current time, and this is how the Fwrite function is used.
int markfile (void)
{
FILE *sp;
Char buff[512];
Char count = 0;
char *currentime = NULL;
Char *wday[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
time_t TIMEP;
struct TM *p;
Time (&TIMEP);
p = localtime (&TIMEP);
Currentime = CTime (&TIMEP);
memset (buff,0,512);
sprintf (Buff, "%s", currentime);
printf ("%d/%d/%d", (1900+p->tm_year), (1+p->tm_mon), p->tm_mday);
printf ("%s%d:%d:%d\n", wday[p->tm_wday],p->tm_hour,p->tm_min,p->tm_sec);
if (sp = fopen ("/root/kay/mark.txt", "A +")) = = = NULL)
return 0;
Fwrite (Currentime,size (currentime) -1,1,sp);
Fclose (SP);
return 1;
}

The function of size (currentime) (= 26) is to derive the number of strings that the pointer currentime refers to (including ' m '), but the output is garbled (it should be the number of strings is too long), so I can lose one of the numbers, and I will be able to comfortably correct the result.

In a different way:
int markfile (void)
{
FILE *sp;
Char buff[512];
Char count = 0;
char *currentime = NULL;
Char *wday[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
time_t TIMEP;
struct TM *p;
Time (&TIMEP);
p = localtime (&TIMEP);
Currentime = CTime (&TIMEP);
memset (buff,0,512);
sprintf (Buff, "%s", currentime);
printf ("%d/%d/%d", (1900+p->tm_year), (1+p->tm_mon), p->tm_mday);
printf ("%s%d:%d:%d\n", wday[p->tm_wday],p->tm_hour,p->tm_min,p->tm_sec);
if (sp = fopen ("/root/kay/mark.txt", "A +")) = = = NULL)
return 0;
Fwrite (Currentime, (count = strlen (Buff)), 1,SP);
printf ("%d\n", count);
Fclose (SP);
return 1;
}
Count = strlen (buff) to get the number of characters result is 25,

In contrast, the fwrite () output character does not include The Terminator (' s '), otherwise it will be garbled because of the number of characters

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Linux fwrite () use method, the current time to write the program of the text