How to get the Drive letter

[newb]

Dear All,

I am using Qt with Win32 API.

what i have is SP_DEVICE_INTERFACE_DETAIL_DATA DevicePath

using this Device path i get VID AND PID of the usb device

my device path looks like below

"\?\usb#vid_1a8d&pid_1000#358094020874450#{a5dcbf1 0-6530-11d2-901f-00c04fb951ed}"

Is there any way to to map DRIVE LETTER to my DEVICE PATH

so please help me to map drive letter to DevicePath

Thanks for any help.

[squidge]

You can't do this easily. The best way would be to compare the GUID (eg. "\\?\Volume{GUID}\") with that returned by GetVolumeNameForVolumeMountPoint()

[newb]

Hi friend ...

Thanks for the reply...

Can you please tell me where i can get the GUID as you mentioned.i mean which returns that.

i don find anything with the DevicePath

Thanks for any help

[newb]

Hi..

To get the volume GUID as you mentioned i tried the code like below

#define BUFFER_SIZE MAX_PATH

WCHAR volume[BUFFER_SIZE];

BOOL bFlag;

bFlag = GetVolumeNameForVolumeMountPoint( pDetData->DevicePath, volume, BUFFER_SIZE );

the bFlag always returns zero it means false.

is there any problem in my code...

please help me up to get the above function work right

[squidge]

You can't pass a DevicePath to that function, that's why it fails. However, you could pass it to IOCTL_MOUNTMGR_QUERY_POINTS, and that will return a GUID.

[newb]

Thanks for the reply dude...

when i include #include <Mountmgr.h> to use the IOCTL_MOUNTMGR_QUERY_POINTS

i get the below error

fatal error C1083: Cannot open include file: Mountmgr.h: No such file or directory

How can i solve this error.


Please guide me

[squidge]

You probably need the Win32 SDK

[newb]

I have fixed that fatal error C1083: Cannot open include file: Mountmgr.h: No such file or directory by WDK installation

Thanks for the Answer dude ..

I am not able to know how to use the IOCTL_MOUNTMGR_QUERY_POINTS .

I have searched the internet and found some sample code to try with.

but i am not sure whether its correct or not....

can you please let me know how to use the IOCTL_MOUNTMGR_QUERY_POINTS to get the drive letter

Thank you for your time

below is my source coode

HANDLE hUsbDevice = CreateFile( pDetData->DevicePath,
                    GENERIC_READ | GENERIC_WRITE,
                    0, NULL, OPEN_EXISTING, 0, NULL);
 
UCHAR Bytes[10000];
 
PMOUNTMGR_MOUNT_POINTS pMntPoints = (PMOUNTMGR_MOUNT_POINTS) Bytes;
 
MOUNTMGR_MOUNT_POINT mntPoint, *pmnt;
 
DWORD bytesReturned;
 
if (hUsbDevice == INVALID_HANDLE_VALUE)
{
   qDebug()<<"CreateFile failed with error: %d\n"<<GetLastError();
 
} 
else
{
   qDebug ()<<"VALID DEVICE";
 
   BOOL status = DeviceIoControl( hUsbDevice,
                 IOCTL_MOUNTMGR_QUERY_POINTS,
                 &mntPoint,
                 sizeof(MOUNTMGR_MOUNT_POINT),
                 pMntPoints,
                 10000,
                 &bytesReturned,
                 NULL);
 
  wprintf(L"\tBOOL VALUE : %d\n", status); 
 
  qDebug ()<<pMntPoints->MountPoints;
 
}

HANDLE hUsbDevice = CreateFile( pDetData->DevicePath,
                    GENERIC_READ | GENERIC_WRITE,
                    0, NULL, OPEN_EXISTING, 0, NULL);

UCHAR Bytes[10000];

PMOUNTMGR_MOUNT_POINTS pMntPoints = (PMOUNTMGR_MOUNT_POINTS) Bytes;

MOUNTMGR_MOUNT_POINT mntPoint, *pmnt;

DWORD bytesReturned;

if (hUsbDevice == INVALID_HANDLE_VALUE)
{
   qDebug()<<"CreateFile failed with error: %d\n"<<GetLastError();

} 
else
{
   qDebug ()<<"VALID DEVICE";

   BOOL status = DeviceIoControl( hUsbDevice,
                 IOCTL_MOUNTMGR_QUERY_POINTS,
                 &mntPoint,
                 sizeof(MOUNTMGR_MOUNT_POINT),
                 pMntPoints,
                 10000,
                 &bytesReturned,
                 NULL);

  wprintf(L"\tBOOL VALUE : %d\n", status); 

  qDebug ()<<pMntPoints->MountPoints;

}

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[newb]

Dear Experts,

Kindly guide me on my problem

[newb]

Dear juicy....

Kindly have look at my problem and please help me up

[newb]

I am in the beginner level

really i am looking for some guidence

so sorry to be annoying....