列出所有驱动器/分区，并使用 Cocoa 获取/dev/rdisc 设备 [英] List all drives/partitions, and get /dev/rdisc device with Cocoa

问题描述

有没有办法列出可用的驱动器，类似于磁盘工具，并为它获取关联的 /dev/rdisk* 设备?

Is there a way to list available drives, similar to Disk Utility, and get the associated /dev/rdisk* device for it?

磁盘工具可以访问这些数据 - 当您选择一个驱动器并按下信息按钮时，它会列出..

Disk Utility has access to this data - when you select a drive and press the Info button, it lists..

Partition Map Scheme : GUID Partition Table
Disk Identifier : disk0
Media Name : Hitachi HTS541612J9SA00 Media

...或选择一个分区:

..or select a partition:

Disk Identifier : disk0s3
Mount Point : /Volumes/BOOTCAMP

是否有 Cocoa API 来解决这个问题?如果是这样，通过 Interface Builder 显示此内容的最佳方式是什么?

Is there a Cocoa API to get at this? If so, what is the best way to display this via Interface Builder?

推荐答案

正如土拨鼠所指出的，IORegistry 确实是所有与设备相关的事物的首选来源.IOKit 文档非常详细且有用；你应该从 IOKit 基础知识，然后点击 从应用程序访问硬件，然后最后查看 存储设备的设备文件访问指南 如果您想以 BSD 方式获取信息.

As groundhog points out, the IORegistry is indeed the go-to source for all things device-related. The IOKit docs are very detailed and helpful; you should start with IOKit Fundamentals, then hit Accessing Hardware from Applications, then finally check out Device File Access Guide for Storage Devices if you want to get at information the BSD way.

在这种情况下，您可以让磁盘仲裁框架执行一些查询 IO 注册表和注册通知的繁重工作.这节省了大量代码，但要完成您想做的所有事情，您最终需要使用带有底层 IOMedia 对象的 IOKit 函数(请参阅 DADiskCopyIOMedia()).

In this case, you can make the Disk Arbitration framework do some of the heavy lifting of querying the IO registry and registering for notifications. This saves a lot of code, but to do everything you want to do, you'll eventually need to use IOKit functions with the underlying IOMedia object (see DADiskCopyIOMedia()).

您可以轻松地围绕表示 IO 注册表中磁盘的 IOMedia 对象编写 Cocoa 包装器，然后使用对象控制器将属性绑定到您的 UI.

You could readily write a Cocoa wrapper around the IOMedia objects that represent the disks in the IO registry, then use object controllers to bind properties to your UI.

以下是通过磁盘仲裁框架注册磁盘外观通知以帮助您入门的示例:

Here's an example of registering for disk appearance notifications through the Disk Arbitration framework to get you started:

// gcc -Wall -framework Foundation -framework DiskArbitration disk_arbiter.m -o disk_arbiter
/* @file disk_arbiter.m
 * @author Jeremy W. Sherman
 * @date 2009-10-03
 *
 * Demonstrates registering for disk appeared notifications from
 * the DiskArbitration framework.
 *
 * Note that disk appeared notifications are delivered for all
 * already-appeared disks at the time of registration, and then
 * trickle in as the events actually happen thereafter.
 */
#import <Foundation/Foundation.h>
#import <DiskArbitration/DiskArbitration.h>
#import <signal.h>

sig_atomic_t sShouldExit = 0;

static void RegisterInterruptHandler(void);
static void HandleInterrupt(int);

static void OnDiskAppeared(DADiskRef disk, void *__attribute__((__unused__)));

int
main(void) {
  CFStringRef const kDARunLoopMode = kCFRunLoopDefaultMode;

  RegisterInterruptHandler();

  // Set up session.
  DASessionRef session = DASessionCreate(kCFAllocatorDefault);
  DARegisterDiskAppearedCallback(session, NULL/*all disks*/, OnDiskAppeared, (void *)NULL);
  DASessionScheduleWithRunLoop(session, CFRunLoopGetCurrent(), kDARunLoopMode);

  // Run event loop.
  printf("Starting...\n(Press Ctrl-C to exit.)\n\n");
  const Boolean kAndReturnAfterHandlingSource = TRUE;
  const CFTimeInterval kForOneSecond = 1.0;
  while (!sShouldExit)
    (void)CFRunLoopRunInMode(kCFRunLoopDefaultMode,
                             kForOneSecond, kAndReturnAfterHandlingSource);

  // Tear down and exit.
  printf("\nExiting...\n");
  DASessionUnscheduleFromRunLoop(session, CFRunLoopGetCurrent(), kDARunLoopMode);
  CFRelease(session);
  exit(EXIT_SUCCESS);
  return EXIT_SUCCESS;
}

static void
RegisterInterruptHandler(void) {
  struct sigaction sigact;
  sigact.sa_handler = HandleInterrupt;
  (void)sigaction(SIGINT, &sigact, NULL/*discard previous handler*/);
}

static void
HandleInterrupt(int __attribute__((__unused__)) signo) {
  sShouldExit = 1;
  RegisterInterruptHandler();
}


static void
OnDiskAppeared(DADiskRef disk, void *__attribute__((__unused__)) ctx) {
  printf("Lo, a disk appears!\n");
  CFShow(disk);
}

这是示例运行的输出:

$ ./disk_arbiter 
Starting...
(Press Ctrl-C to exit.)

Lo, a disk appears!
<DADisk 0x104f80 [0xa01c01a0]>{id = /dev/disk3}
Lo, a disk appears!
<DADisk 0x105b40 [0xa01c01a0]>{id = /dev/disk2s1}
Lo, a disk appears!
<DADisk 0x105ae0 [0xa01c01a0]>{id = /dev/disk2s2}
Lo, a disk appears!
<DADisk 0x105b60 [0xa01c01a0]>{id = /dev/disk2}
Lo, a disk appears!
<DADisk 0x105950 [0xa01c01a0]>{id = /dev/disk1}
Lo, a disk appears!
<DADisk 0x105bc0 [0xa01c01a0]>{id = /dev/disk1s1}
Lo, a disk appears!
<DADisk 0x105540 [0xa01c01a0]>{id = /dev/disk0}
Lo, a disk appears!
<DADisk 0x105660 [0xa01c01a0]>{id = /dev/disk0s1}
Lo, a disk appears!
<DADisk 0x1054a0 [0xa01c01a0]>{id = /dev/disk0s2}
^C
Exiting...

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