Issue with IoGetDeviceInterfaces()

I am trying to get list of hard disks in my computer with
IoGetDeviceInterface(). Here is the code:

DbgPrint( "About to list hard disk devices\n" );

nResult = IoGetDeviceInterfaces( (LPGUID)&GUID_DEVCLASS_DISKDRIVE,
NULL, 0, &pDeviceList );
if (nResult != STATUS_SUCCESS)
{
DbgPrint( "IoGetDeviceInterfaces() failed with error %d\n",
nResult );
}
else
{
pTemp = pDeviceList;

DbgPrint( "Printing device list (%d)\n", 0xffff & *pTemp );

while (*pTemp != UNICODE_NULL)
{
RtlInitUnicodeString( &sTemp, pTemp );
nResult = IoGetDeviceObjectPointer ( &sTemp, FILE_ALL_ACCESS, NULL,
&pDO );
if (nResult != STATUS_SUCCESS)
{
DbgPrint( "IoGetDeviceObjectPointer() returned %x\n", nResult );
}
else
{
// TODO: ObDeferenceObject( pDO )
}

pTemp += (sTemp.Length + sizeof( UNICODE_NULL )) / sizeof( WCHAR );
}

// TODO: ExFreePool( pDeviceList );
}

I used code in src\Swtuner\BDAtuner\gentuner\Filter.cpp as an example.
It's quite strange, but I am getting empty list. Here are the debug
printouts:

About to list hard disk devices
Printing device list (0)

This is despite I do have a hard disk in my machine. Also, devcon
shows it clearly.
Any ideas what's the problem and how to get this thing working?

Thanks!

Doron
Wed Mar 14 23:31:17 CDT 2007

you are using the wront GUID. GUID_DEVCLASS_DISKDRIVE is the device class
guid (e.g. the one you find at the top of the INF), not the device interface
GUID. The DEVCLASS part of the name is a clear indication of this.

GUID_DEVINTERFACE_DISK in winioctl.h is probably what you want

d
--
Please do not send e-mail directly to this alias. this alias is for
newsgroup purposes only.
This posting is provided "AS IS" with no warranties, and confers no rights.


<alexander.sandler@gmail.com> wrote in message
news:1173912263.506306.312900@y80g2000hsf.googlegroups.com...
>I am trying to get list of hard disks in my computer with
> IoGetDeviceInterface(). Here is the code:
>
> DbgPrint( "About to list hard disk devices\n" );
>
> nResult = IoGetDeviceInterfaces( (LPGUID)&GUID_DEVCLASS_DISKDRIVE,
> NULL, 0, &pDeviceList );
> if (nResult != STATUS_SUCCESS)
> {
> DbgPrint( "IoGetDeviceInterfaces() failed with error %d\n",
> nResult );
> }
> else
> {
> pTemp = pDeviceList;
>
> DbgPrint( "Printing device list (%d)\n", 0xffff & *pTemp );
>
> while (*pTemp != UNICODE_NULL)
> {
> RtlInitUnicodeString( &sTemp, pTemp );
> nResult = IoGetDeviceObjectPointer ( &sTemp, FILE_ALL_ACCESS, NULL,
> &pDO );
> if (nResult != STATUS_SUCCESS)
> {
> DbgPrint( "IoGetDeviceObjectPointer() returned %x\n", nResult );
> }
> else
> {
> // TODO: ObDeferenceObject( pDO )
> }
>
> pTemp += (sTemp.Length + sizeof( UNICODE_NULL )) / sizeof( WCHAR );
> }
>
> // TODO: ExFreePool( pDeviceList );
> }
>
> I used code in src\Swtuner\BDAtuner\gentuner\Filter.cpp as an example.
> It's quite strange, but I am getting empty list. Here are the debug
> printouts:
>
> About to list hard disk devices
> Printing device list (0)
>
> This is despite I do have a hard disk in my machine. Also, devcon
> shows it clearly.
> Any ideas what's the problem and how to get this thing working?
>
> Thanks!
>

alexander
Thu Mar 15 02:30:06 CDT 2007

Oh my bad.
Thanks a lot Doron. Using right GUID definitely helps :-)

Alexander.

On Mar 15, 6:31 am, "Doron Holan [MS]" <dor...@nospam.microsoft.com>
wrote:
> you are using the wront GUID. GUID_DEVCLASS_DISKDRIVE is the device class
> guid (e.g. the one you find at the top of the INF), not the device interface
> GUID. The DEVCLASS part of the name is a clear indication of this.
>
> GUID_DEVINTERFACE_DISK in winioctl.h is probably what you want
>
> d
> --
> Please do not send e-mail directly to this alias. this alias is for
> newsgroup purposes only.
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
> <alexander.sand...@gmail.com> wrote in message
>
> news:1173912263.506306.312900@y80g2000hsf.googlegroups.com...
>
> >I am trying to get list of hard disks in my computer with
> > IoGetDeviceInterface(). Here is the code:
>
> > DbgPrint( "About to list hard disk devices\n" );
>
> > nResult = IoGetDeviceInterfaces( (LPGUID)&GUID_DEVCLASS_DISKDRIVE,
> > NULL, 0, &pDeviceList );
> > if (nResult != STATUS_SUCCESS)
> > {
> > DbgPrint( "IoGetDeviceInterfaces() failed with error %d\n",
> > nResult );
> > }
> > else
> > {
> > pTemp = pDeviceList;
>
> > DbgPrint( "Printing device list (%d)\n", 0xffff & *pTemp );
>
> > while (*pTemp != UNICODE_NULL)
> > {
> > RtlInitUnicodeString( &sTemp, pTemp );
> > nResult = IoGetDeviceObjectPointer ( &sTemp, FILE_ALL_ACCESS, NULL,
> > &pDO );
> > if (nResult != STATUS_SUCCESS)
> > {
> > DbgPrint( "IoGetDeviceObjectPointer() returned %x\n", nResult );
> > }
> > else
> > {
> > // TODO: ObDeferenceObject( pDO )
> > }
>
> > pTemp += (sTemp.Length + sizeof( UNICODE_NULL )) / sizeof( WCHAR );
> > }
>
> > // TODO: ExFreePool( pDeviceList );
> > }
>
> > I used code in src\Swtuner\BDAtuner\gentuner\Filter.cpp as an example.
> > It's quite strange, but I am getting empty list. Here are the debug
> > printouts:
>
> > About to list hard disk devices
> > Printing device list (0)
>
> > This is despite I do have a hard disk in my machine. Also, devcon
> > shows it clearly.
> > Any ideas what's the problem and how to get this thing working?
>
> > Thanks!