fseek

最新推荐文章于 2017-03-29 11:05:00 发布

一路阳光随行

最新推荐文章于 2017-03-29 11:05:00 发布

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分类专栏： C/C++

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详情请看 http://www.cplusplus.com/reference/cstdio/fseek/

（1） fseek()

定义： int fseek ( FILE * stream, long int offset, int origin );

功能：重新设置stream的位置到offset处基于文件头/文件尾/当前位置

参数：stream: 只想一个文件对象的指针.

offset: 二进制文件: Number of bytes to offset from origin. 文本文件: Either zero, or a value returned byftell.

origin: 偏移基于的位置.

It is specified by one of the following constants defined in<cstdio> exclusively to be used as arguments for this function:

Constant	Reference position
SEEK_SET	文件头
SEEK_CUR	当前位置
SEEK_END	文件

Library implementations are allowed to not meaningfully support SEEK_END (therefore, code using it has no real standard portability).

返回值：成功返回0 失败返回非0

/* fseek example */
#include <stdio.h>

int main ()
{
  FILE * pFile;
  pFile = fopen ( "example.txt" , "wb" );
  fputs ( "This is an apple." , pFile );
  fseek ( pFile , 9 , SEEK_SET );
  fputs ( " sam" , pFile );
  fclose ( pFile );
  return 0;
}

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