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16-Bit Language Tools Libraries
fgetpos
Description:
Include:
Prototype:
Gets the stream's file position.
<stdio.h>
int fgetpos(FILE * stream , fpos_t * pos );
Arguments:
stream
pos
target stream
position-indicator storage
Return Value:
Remarks:
Returns 0 if successful; otherwise, returns a non-zero value.
The function stores the file-position indicator for the given stream in
*pos if successful, otherwise, fgetpos sets errno .
Example:
/*
/*
/*
/*
/*
/*
/*
This program opens a file and reads bytes at */
several different locations. The fgetpos */
function notes the 8th byte. 21 bytes are */
read then 18 bytes are read. Next the */
fsetpos function is set based on the */
fgetpos position and the previous 21 bytes */
are reread. */
#include <stdio.h> /*
/*
/*
/*
for fgetpos, fread,
printf, fopen, fclose,
FILE, NULL, perror,
fpos_t, sizeof
*/
*/
*/
*/
int main(void)
{
FILE *myfile;
fpos_t pos;
char buf[25];
if ((myfile = fopen("sampfgetpos.c", "rb")) ==
NULL)
printf("Cannot open file\n");
else
{
fread(buf, sizeof(char), 8, myfile);
if (fgetpos(myfile, &pos) != 0)
perror("fgetpos error");
else
{
fread(buf, sizeof(char), 21, myfile);
printf("Bytes read: %.21s\n", buf);
fread(buf, sizeof(char), 18, myfile);
printf("Bytes read: %.18s\n", buf);
}
if (fsetpos(myfile, &pos) != 0)
perror("fsetpos error");
fread(buf, sizeof(char), 21, myfile);
printf("Bytes read: %.21s\n", buf);
fclose(myfile);
}
}
Output:
Bytes read: program opens a file
Bytes read: and reads bytes at
Bytes read: program opens a file
DS51456E-page 54
? 2008 Microchip Technology Inc.
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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