RT Thread虚拟文件系统如何使用f_gets等函数

发布于 2023-11-27 19:22:44 浏览：409 订阅该版

a1012112796 2023-11-28

这家伙很懒，什么也没写！

直接上例程吧:

test.cpp
```CXX
#include "rtthread.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

static void test_w(void) 
{
    int fd = open("test.txt", O_CREAT | O_WRONLY | O_TRUNC);
    if (fd < 0)
    {
        rt_kprintf("can't open test file\n");
        return;
    }

static const char str[] = "1 hello world\n3 hello rt-thread \n3 hello linux \n";

write(fd, str, sizeof(str));
    close(fd);
}
MSH_CMD_EXPORT(test_w, test_w);

#include "dfs_file.h"

namespace FF { // 借助 c++ 解决头文件结构体冲突的问题，用 c 得分成两个 c 文件写，也可以解决。

#include "ff.h"

void read_elm(void *fp, char *pbuffer, int len)
{
    f_gets(pbuffer, len, (FIL *)fp);
}

} // namespace FF

static void test_read()
{
    int fd = open("test.txt", O_RDONLY);
    if (fd < 0)
    {
        rt_kprintf("can't open test file\n");
        return;
    }

char buffer[256] = {0};

dfs_lock();

struct dfs_file *fp = fd_get(fd);
    RT_ASSERT(fp && fp->vnode->data); // v1: fp->vnode->data 换成 fp->data

FF::read_elm(fp->vnode->data, buffer, sizeof(buffer));
    ::rt_kprintf("get : '%s'\n", buffer);

dfs_unlock();

close(fd);
}
MSH_CMD_EXPORT(test_read, test_read);

```

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231128/253234699f0acadd9bbe40895a04a695.png.webp)