获得当前硬盘上全部盘符

这一系列文章是根据cutebunny 的BLOG “windows的磁盘操作” 写成的,主要是部分修改原作中的代码,使之兼容Unicode和Windows 7 64bit. 原文可以在下面的网址找到

http://cutebunny.blog.51cto.com 。 本文是参考 “windows的磁盘操作之五——获取物理磁盘上的所有逻辑分区号”写成。

程序实现了获得当前硬盘上全部盘符的功能(分区可能没有分配盘符,比如:win7一般都会隐藏起来最前面的分区)。

// emuPart.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "windows.h"

/******************************************************************************
* Function: get disk's physical number from its drive letter
*           e.g. C-->0 (C: is on disk0)
* input: letter, drive letter
* output: N/A
* return: Succeed, disk number
*         Fail, -1
******************************************************************************/
DWORD GetPhysicalDriveFromPartitionLetter(TCHAR letter)
{
    HANDLE hDevice;               // handle to the drive to be examined
    BOOL result;                 // results flag
    DWORD readed;                   // discard results
    STORAGE_DEVICE_NUMBER number;   //use this to get disk numbers
 
    TCHAR path[MAX_PATH];
    wsprintf(path, L"\\\\.\\%c:", letter);
    hDevice = CreateFile(path, // drive to open
                         GENERIC_READ | GENERIC_WRITE,    // access to the drive
                         FILE_SHARE_READ | FILE_SHARE_WRITE,    //share mode
                         NULL,             // default security attributes
                         OPEN_EXISTING,    // disposition
                         0,                // file attributes
                         NULL);            // do not copy file attribute
    if (hDevice == INVALID_HANDLE_VALUE) // cannot open the drive
    {
        fprintf(stderr, "CreateFile() Error: %ld\n", GetLastError());
        return DWORD(-1);
    }
 
    result = DeviceIoControl(
                hDevice,                // handle to device
                IOCTL_STORAGE_GET_DEVICE_NUMBER, // dwIoControlCode
                NULL,                            // lpInBuffer
                0,                               // nInBufferSize
                &number,           // output buffer
                sizeof(number),         // size of output buffer
                &readed,       // number of bytes returned
                NULL      // OVERLAPPED structure
            );
    if (!result) // fail
    {
        fprintf(stderr, "IOCTL_STORAGE_GET_DEVICE_NUMBER Error: %ld\n", GetLastError());
        (void)CloseHandle(hDevice);
        return (DWORD)-1;
    }
    printf("%d %d %d\n\n", number.DeviceType, number.DeviceNumber, number.PartitionNumber);
 
    (void)CloseHandle(hDevice);
    return number.DeviceNumber;
}

/******************************************************************************
* Function: get disk's drive letters from physical number
*           e.g. 0-->{C, D, E} (disk0 has 3 drives, C:, D: and E:)
* input: phyDriveNumber, disk's physical number
* output: letters, letters array
* return: Succeed, the amount of letters
*         Fail, -1
******************************************************************************/
DWORD GetPartitionLetterFromPhysicalDrive(DWORD phyDriveNumber, TCHAR **letters)
{
    DWORD mask;
    DWORD driveType;
    DWORD bmLetters;
    DWORD diskNumber;
    TCHAR path[MAX_PATH]; 
    TCHAR letter;
    DWORD letterNum;
    WORD i;
    TCHAR *p;
 
    bmLetters = GetLogicalDrives();
    if (0 == bmLetters)
    {
        return (DWORD)-1;
    }
 
    letterNum = 0;
    for (i = 0; i < sizeof(DWORD) * 8; i++)
    {
        mask = 0x1u << i;
        if ((mask & bmLetters) == 0)        //get one letter
        {
            continue;
        }
        letter = (TCHAR)(0x41 + i);    //ASCII change
        wsprintf(path, L"%c:\\", letter);
        driveType = GetDriveType(path);
        if (driveType != DRIVE_FIXED)
        {
            bmLetters &= ~mask;     //clear this bit
            continue;
        }
        diskNumber = GetPhysicalDriveFromPartitionLetter(letter);
        if (diskNumber != phyDriveNumber)
        {
            bmLetters &= ~mask;     //clear this bit
            continue;
        }
        letterNum++;
    }
 
    //build the result
    *letters = (TCHAR *)malloc(letterNum);
    if (NULL == *letters)
    {
        return (DWORD)-1;
    }
    p = *letters;
    for (i = 0; i < sizeof(DWORD) * 8; i++)
    {
        mask = 0x1u << i;
        if ((mask & bmLetters) == 0)
        {
            continue;
        }
        letter = (TCHAR)(0x41 + i);    //ASCII change
        *p = letter;
		printf("%c",letter);
        p++;
    }
   
    return letterNum;
}

int _tmain(int argc, _TCHAR* argv[])
{
	TCHAR	*List;

	GetPartitionLetterFromPhysicalDrive(0,&List);

	getchar();
	return 0;
}

 

运行结果如下 (注意,运行时需要管理员的权限)
emupart

最后一行给出了PhysicalDrive0 上的三个盘符

参考:
1.cutebunny 的BLOG “windows的磁盘操作” 可以在这里下载 WindowsDisk

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