问一个关于输入输出的问题

[jake1121]

如果要把文件分块输入要怎样做呢？

例如在读取数据文件是文件太大，分成几块读入内存要用文件流的什么函数？

[made_in_]

还是用fread之类的函数,只是指定一个buffer和其大小就行了.
size_t fread( void *buffer, size_t size, size_t count, FILE *stream );

[lplpzhuzhu]

msdn上：

#include <stdio.h>

void main( void )
{
FILE *stream;
char list[30];
int i, numread, numwritten;

/* Open file in text mode: */
if( (stream = fopen( "fread.out", "w+t" )) != NULL )
{
for ( i = 0; i < 25; i++ )
list[i] = (char)('z' - i);
/* Write 25 characters to stream */
numwritten = fwrite( list, sizeof( char ), 25, stream );
printf( "Wrote %d items\n", numwritten );
fclose( stream );

}
else
printf( "Problem opening the file\n" );

if( (stream = fopen( "fread.out", "r+t" )) != NULL )
{
/* Attempt to read in 25 characters */
numread = fread( list, sizeof( char ), 25, stream );
printf( "Number of items read = %d\n", numread );
printf( "Contents of buffer = %.25s\n", list );
fclose( stream );
}
else
printf( "File could not be opened\n" );
}

[nsly]

也许在头部定义文件信息，然后针对头部信息的读取，决定你的操作

[yjh1982]

随便哪个标准库都行啊

[wuxq7311]

很好办嘛，定义一个BUF，大小想取多少就取多少，不就OK啦！！

[jack_wq]

就是，fread()不久搞定了！

[jake1121]

能不能写一个简单的例子看看？

先谢谢拉！