November 2016
Beginner to intermediate
816 pages
19h 58m
Japanese
Content preview from Cクイックリファレンス 第2版
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fsetpos
433
const int reclength_file = sizeof(record);
const long seek_id = 123L;
FILE* fp = fopen("records", "rb");
if (fp == NULL)
{
perror("Unable to open records file");
}
else
{
do
{
if (1 > fread(&cur_rec.id, sizeof(long), 1, fp))
{
fprintf(stderr, "Record with ID %ld not found.\n", seek_id);
break;
}
else
//
レコードの残りは読み飛ばす
{
if (fseek(fp, reclength_file - sizeof(long), 1))
{
perror("fseek failed");
break;
}
}
} while (cur_rec.id != seek_id);
■
参照
●
fgetpos()
,
fsetpos()
,
ftell()
,
rewind()
fsetpos
ファイル位置指示子を、前に記録した位置に設定する
#include <stdio.h>
int fsetpos(FILE*
fp
, const fpos_t*
ppos
);
fsetpos()
関数は
FILE
ポインタ引数で指定したファイルの位置指示子を設定する。新位
置の値へのポインタである
ppos ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.