Question

什么最容易地进入区块一级的批号系统? 我不关心档案,也不关心原封,我不得不在某个时候读一下财务处。是否有这样做的简单方法(在C中)? 或者说,我能看一看什么来源? 我发现,这个网络上没有任何可观的教导,我很谨慎,无法深入到煤炭来源,了解如何做。

Answer 1

是的,见e2fsprogs。这为你提供了工具,能够用Ex2、Ex3和Ex4档案系统做任何事情(!)。它还设有图书馆接口,以便你能够做任何其他事情。

See the included debugfs, it may be sufficient for You tostart. 否则,检查负责人并撰写一些法典。

Answer 2

If you want a simple app then I suggest you can take a look at "dd" utility. I comes as part of GNU Core Utility. Its source is available for download. Take a look at its home page, here.
If you want to achieve same from a C code, then please refer to following code. Hope this helps you. :)

#include <stdio.h>
#include <linux/fs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define SECTOR_NO 10 /*read 10th sector*/

int main()
{
        int sector_size;
        char *buf;
        int n = SECTOR_NO;

        int fd = open("/dev/sda1", O_RDONLY|O_NONBLOCK);
        ioctl(fd, BLKSSZGET, &sector_size);
        printf("%d
", sector_size);
        lseek(fd, n*sector_size, SEEK_SET);

        buf = malloc(sector_size);
        read(fd, buf, sector_size);

        return 0;
}

Answer 3

弃置装置及其内部的分门别类,就像你从(和书写)读到的普通档案一样,例如:

head -c 2048 /dev/sda1 > first_2048_bytes

当然,你们需要扎根。

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