如何检测硬盘驱动器是否通过USB连接? [英] How do I detected whether a hard drive is connected via USB?

问题描述

我正在尝试为朋友和家人编写一个小备份程序，并希望它尽可能简单易用.我不想问用户将他们的数据备份到哪里，我只想搜索并使用连接到计算机的第一个USB硬盘.获取硬盘驱动器的唯一 ID 也可能是一个好主意，就像下次运行备份时仔细检查一样.

I am trying to write a little backup program for friends and family and want it to be as simple to use a possible. I don't want to have to ask the user where to backup their data to, I just want to search for and use the first USB hard drive connected to the computer. Obtaining the unique ID of the hard drive would probably be a good idea too, just as a double check for next time the backup runs.

推荐答案

我花了一点时间环顾四周，发现了一个名为 SetupDiEnumDeviceInfo 的函数，它确实提供了一个解决方案来了解硬盘驱动器是否可移动，但有了这些信息我仍然无法(还)将我找到的内容映射回驱动器号！

I spent a little time looking around and found a function called SetupDiEnumDeviceInfo which did provide a solution to know whether a hard drive was removable or not but with that information I still can't (yet) map what I find back to a drive letter!

这是我目前所拥有的(以下代码创建了一个 dll):

Here's what I have so far (following code creates a dll):

#include "stdafx.h"
#include <setupapi.h>
#include <devguid.h>
#include <cfgmgr32.h>
extern "C" __declspec(dllexport) int usb_hard_drives() {
  HDEVINFO hdevinfo = SetupDiGetClassDevs(&GUID_DEVCLASS_DISKDRIVE, NULL, NULL, DIGCF_PRESENT);
  if (hdevinfo == INVALID_HANDLE_VALUE) return -1;
  DWORD MemberIndex = 0;
  SP_DEVINFO_DATA sp_devinfo_data;
  ZeroMemory(&sp_devinfo_data, sizeof(sp_devinfo_data));
  sp_devinfo_data.cbSize = sizeof(sp_devinfo_data);
  int c = 0;
  while (SetupDiEnumDeviceInfo(hdevinfo, MemberIndex, &sp_devinfo_data)) {
    DWORD PropertyRegDataType;
    DWORD RequiredSize;
    DWORD PropertyBuffer;
    if (SetupDiGetDeviceRegistryProperty(hdevinfo, &sp_devinfo_data, SPDRP_CAPABILITIES, &PropertyRegDataType, (PBYTE)&PropertyBuffer, sizeof(PropertyBuffer), &RequiredSize)) {
      if (PropertyBuffer && CM_DEVCAP_REMOVABLE == CM_DEVCAP_REMOVABLE) {
        // do something here to identify the drive letter.
        c++;
      }
    }       
    MemberIndex++;
  }
  SetupDiDestroyDeviceInfoList(hdevinfo);
  return c;
}

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