SW006014 Microchip Technology, SW006014 Datasheet - Page 91

• Manufacturer Part Number: SW006014
• Description: C COMPILER MPLAB FOR PIC24 MCU
• Manufacturer: Microchip Technology
• Type: MPLAB® C Compilerr
• Series: PIC24r

Specifications of SW006014

• Supported Families: PIC24
• Core Architecture: PIC
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC24
• Tool Function: Compiler
• Tool Type: Compiler
• Processor Series: PIC24
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: PIC24
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2008 Microchip Technology Inc.
vfprintf
Description:
Include:
Prototype:
Arguments:
Return Value:
Remarks:
Example:
Prints formatted data to a stream using a variable length argument list.
<stdio.h>
<stdarg.h>
int vfprintf(FILE *stream, const char *format,
va_list ap);
stream
format
ap
Returns number of characters generated or a negative number if an
error occurs.
The format argument has the same syntax and use that it has in
printf.
To access the variable length argument list, the ap variable must be ini-
tialized by the macro va_start and may be reinitialized by additional
calls to va_arg. This must be done before the vfprintf function is
called. Invoke va_end after the function returns. For more details see
stdarg.h.
#include <stdio.h>
#include <stdarg.h> /* for va_start,
FILE *myfile;
void errmsg(const char *fmt, ...)
{
}
int main(void)
{
}
Output:
Contents of afile.txt
Error: The letter 'a' is not an integer value.
Error: Requires 3 or more characters.
va_list ap;
va_start(ap, fmt);
vfprintf(myfile, fmt, ap);
va_end(ap);
int num = 3;
if ((myfile = fopen("afile.txt", "w")) == NULL)
else
{
}
fclose(myfile);
errmsg("Error: The letter '%c' is not %s\n", 'a',
printf("Cannot open afile.txt\n");
errmsg("Error: Requires %d%s%c", num,
"an integer value.");
" or more characters.", '\n');
pointer to the open stream
format control string
pointer to a list of arguments
/* for vfprintf, fopen, */
/* fclose, printf,
/* FILE, NULL
/* va_list, va_end
DS51456E-page 87
*/
*/
*/
*/