如何从Windows 7中的驱动器号获取可移动设备的物理驱动器号？

Question

我试图查找物理驱动器号(如,我需要N在\\.\PhysicalDriveN打开读取的块设备)从光盘驱动器在Windows 7的驱动器盘符本页面表明IOCTL_STORAGE_GET_DEVICE_NUMBER应该工作,但它返回0表示C:和D的驱动器号:(其中D:是可移动驱动器),因此不能正确.还建议使用IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS,但在D:上失败并出现ERROR_INVALID_FUNCTION.

我不禁觉得我错过了某个关键概念.

这是我的代码:

#include "stdafx.h"
#include "Windows.h"


void printLastError(){
  DWORD lastError;
  DWORD bytesReturned;
  WCHAR outbuf[2048];

  lastError = GetLastError();

  bytesReturned = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,
    NULL, lastError, LANG_USER_DEFAULT, outbuf, 2048, NULL);

  if (bytesReturned > 0){
    wprintf(outbuf);
  } else {
    printf("Error %d while formatting error %d\n", GetLastError(),     lastError);
  }
}

void readDeviceNumberByExtents(HANDLE hFile){
  BOOL ioctlSuccess;
  DWORD bytesReturned;

  VOLUME_DISK_EXTENTS vde;

  ioctlSuccess = DeviceIoControl(hFile,
    IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS,
    NULL, 0, &vde, sizeof(vde), &bytesReturned, NULL);

    if (ioctlSuccess != 0){
      printf("%d\n", vde.Extents->DiskNumber );
    } else {
      printLastError();
  }
}

void readDeviceNumberByStorage(HANDLE hFile){
  BOOL ioctlSuccess;
  DWORD bytesReturned;

  STORAGE_DEVICE_NUMBER sdn;

  ioctlSuccess = DeviceIoControl(hFile,
    IOCTL_STORAGE_GET_DEVICE_NUMBER,
    NULL, 0, &sdn, sizeof(sdn), &bytesReturned, NULL);

  if (ioctlSuccess != 0){
    printf("%d\n", sdn.DeviceNumber );
  } else {
    printLastError();
  }
}

void runTest(WCHAR* driveName){
  HANDLE driveHandle;
  DWORD diskNumber;

  driveHandle = CreateFile(driveName,
    0,
    FILE_SHARE_READ | FILE_SHARE_WRITE,
    NULL,
    OPEN_EXISTING,
    FILE_ATTRIBUTE_NORMAL,
    NULL);

  if (driveHandle != INVALID_HANDLE_VALUE){
    wprintf(L"Opened %s\n", driveName);

    printf("Device number by extents: ");
    readDeviceNumberByExtents(driveHandle);
    printf("Device number by storage: ");
    readDeviceNumberByStorage(driveHandle);

    CloseHandle(driveHandle);
  } else {
    printf("Failure!\n");   
  }
}

int _tmain(int argc, _TCHAR* argv[])
{
  runTest(L"\\\\.\\C:");
  printf("\n");
  runTest(L"\\\\.\\D:");

  getc(stdin);
  return 0;
}

...以及以管理员身份运行它时的输出:

Opened \\.\C:
Device number by extents: 0
Device number by storage: 0

Opened \\.\D:
Device number by extents: Incorrect function.
Device number by storage: 0

Answer 1

在"\\.\PhysicalDriveN"只有工作(的东西,像)硬盘驱动器,而不是可移动磁盘.如果某些东西像可移动磁盘(或软盘,CD-ROM等),则"\\.\X:"打开原始驱动器(其他驱动器不支持分区,因此它们之间的区别"\\.\x:"和"\\.\PhysicalDiskN"不存在).您通常希望用来GetDriveType确定您拥有的磁盘类型,并且只有在DRIVE_FIXED您说这是您尝试查找驱动器号并使用"\\.\PhysicalDriveN"它时才会使用它.