f_printf

The f_printf function writes formatted string to the file.

int f_printf (
  FIL* FileObject,     /* File object */
  const char* Foramt,  /* Format stirng */
  ...
);

Parameters

FileObject
Pointer to the open file object structure.
Format
Pointer to the null-terminated format string.
...
Optional arguments.

Return Values

When the function succeeded, number of characters written is returned. When the function failed due to disk full or any error, an EOF will be returned.

Description

The f_printf() is a wrapper function of f_putc() and f_puts(). The format control directive is a sub-set of standard library shown as follos:

QuickInfo

Available when _FS_READONLY == 0 and _USE_STRFUNC is 1 or 2. When it is set to 2, '\n's contained in the output are converted to "\r\n".

Example

    f_printf(&fil, "%6d", -200);         // "  -200"
    f_printf(&fil, "%02u", 5);           // "05"
    f_printf(&fil, "%ld", 12345678L);    // "12345678"
    f_printf(&fil, "%08lX", 1194684UL);  // "00123ABC"
    f_printf(&fil, "%s", "String");      // "String"
    f_printf(&fil, "%c", 'a');           // "a"

See Also

f_open, f_putc, f_puts, f_gets, f_close, FIL

Return