使用的函数： int _open( const char *filename, int oflag [, int pmode] ); int _close( int handle ); int _read( int handle, void *buffer, unsigned int count ); int _write( int handle, const void *buffer, unsigned int count ); __int64 _telli64( int handle ); __int64 _lseeki64( int handle, __int64 offset, int origin );
其中_telli64和_lseeki64是读取大文件的关键
例子(msdn)：
//以二进制方式读一个文件 #include <fcntl.h> /* Needed only for _O_RDWR definition */ #include <io.h> #include <stdlib.h> #include <stdio.h>
char buffer[60000];
void main( void ) { int fh; unsigned int nbytes = 60000, bytesread;
