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如何通过编程获得所有指定的USB设备在电脑上所占的盘符(如E,F...),请给出完整的解决方案或者最好能给出完整的代码.谢谢!
网友回答：
http://community.csdn.net/Expert/FAQ/FAQ_Index.asp?id=193595
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BOOL GetDisksProperty(HANDLE hDevice, PSTORAGE_DEVICE_DESCRIPTOR pDevDesc)
{
STORAGE_PROPERTY_QUERY Query; // input param for query
DWORD dwOutBytes; // IOCTL output length
BOOL bResult; // IOCTL return val
// specify the query type
Query.PropertyId = StorageDeviceProperty;
Query.QueryType = PropertyStandardQuery;
// Query using IOCTL_STORAGE_QUERY_PROPERTY
bResult = ::DeviceIoControl(hDevice, // device handle
IOCTL_STORAGE_QUERY_PROPERTY, // info of device property
&Query, sizeof(STORAGE_PROPERTY_QUERY), // input data buffer
pDevDesc, pDevDesc->Size, // output data buffer
&dwOutBytes, // outs length
(LPOVERLAPPED)NULL);
return bResult;
}
/****************************************************************************
*
* FUNCTION: chFirstDriverFrameMask(ULONG unitmask)
*
* PURPOSE: get the logic name of driver
*
****************************************************************************/
char chFirstDriveFromMask (ULONG unitmask)
{
char i;
for (i = 0; i < 26; ++i)
{
if (unitmask & 0x1)
break;
unitmask = unitmask >> 1;
}
return (i + A);
}
/****************************************************************************
*
* FUNCTION: ReInitUSB_Disk_Letter()
*
* PURPOSE: get the usb disks, and filling the szMoveDiskName with them
*
****************************************************************************/
void ReInitUSB_Disk_Letter()
{
int k = 0;
DWORD MaxDriveSet, CurDriveSet;
DWORD drive, drivetype;
TCHAR szBuf[300];
HANDLE hDevice;
PSTORAGE_DEVICE_DESCRIPTOR pDevDesc;
for(k=0; k<26; k++)
szMoveDiskName[k] = \0;
k = 1;
// Get available drives we can monitor
MaxDriveSet = CurDriveSet = 0;
MaxDriveSet = GetLogicalDrives();
CurDriveSet = MaxDriveSet;
for ( drive = 0; drive < 32; ++drive )
{
if ( MaxDriveSet & (1 << drive) )
{
DWORD temp = 1<<drive;
_stprintf( szDrvName, _T("%c:\\"), A+drive );
switch ( GetDriveType( szDrvName ) )
{
case 0: // The drive type cannot be determined.
case 1: // The root directory does not exist.
drivetype = DRVUNKNOWN;
break;
case DRIVE_REMOVABLE: // The drive can be removed from the drive.
drivetype = DRVREMOVE;
szMoveDiskName[k] = chFirstDriveFromMask(temp);
szMoveDiskName[0]=k;
k++;
break;
case DRIVE_CDROM: // The drive is a CD-ROM drive.
break;
case DRIVE_FIXED: // The disk cannot be removed from the drive.
drivetype = DRVFIXED;
sprintf(szBuf, "\\\\?\\%c:", A+drive);
hDevice = CreateFile(szBuf, GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, NULL, NULL);
if (hDevice != INVALID_HANDLE_VALUE)
{
pDevDesc = (PSTORAGE_DEVICE_DESCRIPTOR)new BYTE[sizeof(STORAGE_DEVICE_DESCRIPTOR) + 512 - 1];
pDevDesc->Size = sizeof(STORAGE_DEVICE_DESCRIPTOR) + 512 - 1;
if(GetDisksProperty(hDevice, pDevDesc))
{
if(pDevDesc->BusType == BusTypeUsb)
{
szMoveDiskName[k] = chFirstDriveFromMask(temp);
szMoveDiskName[0]=k;
k++;
}
}
delete pDevDesc;
CloseHandle(hDevice);
}
break;
case DRIVE_REMOTE: // The drive is a remote (network) drive.
drivetype = DRVREMOTE;
szMoveDiskName[k] = chFirstDriveFromMask(temp);
szMoveDiskName[0]=k;
k++;
break;
case DRIVE_RAMDISK: // The drive is a RAM disk.
drivetype = DRVRAM;
break;
}
}
}
}