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From: kate.rahul on 6 Mar 2007 11:34
Hi,

I have written sample code.
This enumerates the available device list from the system using the
SetupXXX API. But I got the error "0x000006f8 - The supplied user
buffer is not valid for the requested operation" from the API
SetupDiGetDeviceInfoListDetail().

I have taken care to initialize the cbsize member with
"sizeof(SP_DEVINFO_LIST_DETAIL_DATA)"

Error occured in the VC++ 8.0 only but this error did not occur in the
VC++ 6.0.

///////////// Code start here ////////////////
PCWSTR szMachineName = NULL;
HDEVINFO devs = INVALID_HANDLE_VALUE;
DWORD devIndex;
SP_DEVINFO_DATA devInfo;
SP_DEVINFO_LIST_DETAIL_DATA devInfoListDetail;

//Get the device information set of all devices on a local machine.
devs = SetupDiGetClassDevsEx(NULL,
NULL,
NULL,
DIGCF_ALLCLASSES | DIGCF_PROFILE |
DIGCF_PRESENT,
NULL,
szMachineName,
NULL);

//Retrieve information associated with a device information set
devInfoListDetail.cbSize = sizeof(SP_DEVINFO_LIST_DETAIL_DATA);
if(!SetupDiGetDeviceInfoListDetail(devs,
&devInfoListDetail))
{
if(devs != INVALID_HANDLE_VALUE)
{
SetupDiDestroyDeviceInfoList(devs);
}
}

//
// now enumerate them
//

devInfo.cbSize = sizeof(devInfo);
for(devIndex=0;SetupDiEnumDeviceInfo(devs,devIndex,&devInfo);
devIndex++)
{
LPTSTR desc;
desc = GetDeviceDescription(devs,
&devInfo);
AfxMessageBox(desc);
}
///////////// Code end here ////////////////


Regards,
Rahul

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