C--文件操作

_lseek

<io.h>，_lseek returns the offset, in bytes, of the new position from the beginning of the file. _lseeki64 returns the offset in a 64-bit integer.

例：

 /* Find current position: */   pos = _lseek( fh, 0L, SEEK_CUR );   if( pos == -1L )      perror( "_lseek to current position failed" );   else      printf( "Position for current position seek = %ld\n", pos );

 fwrite ,wrtie,writefile的关系

Fwrite是C库函数，write是Linux系统API函数，writefile是windows系统API函数。

宽字节

保存到文件

fwprintf(fp,L"%d\r\n",100);