Question

I would like to know whether i can get the drive information using the

SP_DEVICE_INTERFACE_DETAIL_DATA’s DevicePath

my device path looks like below

“\?\usb#vid_04f2&pid_0111#5&39fe81e&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed}”

also please tell me in the winapi they say “To determine whether a drive is a USB-type drive, call SetupDiGetDeviceRegistryProperty and specify the SPDRP_REMOVAL_POLICY property.”

i too use SetupDiGetDeviceRegistryProperty like below

while ( !SetupDiGetDeviceRegistryProperty( hDevInfo,&DeviceInfoData,
    SPDRP_REMOVAL_POLICY,&DataT,( PBYTE )buffer,buffersize,&buffersize ))

but i dont know how can i get the drive type using the above..

Please help me up

Answer 1

Probably what you are looking for you will be find here http://support.microsoft.com/kb/264203/en. Another link http://support.microsoft.com/kb/305184/en can be also interesting for you.

UPDATED: Example from http://support.microsoft.com/kb/264203/en shows you how to use to determine whether USB-Drive is removable. You can also use SetupDiGetDeviceRegistryProperty with SPDRP_REMOVAL_POLICY on the device instance (use SetupDiEnumDeviceInfo, SetupDiGetDeviceInstanceId and then SetupDiGetDeviceRegistryProperty). If returned DWORD has CM_REMOVAL_POLICY_EXPECT_SURPRISE_REMOVAL or CM_REMOVAL_POLICY_EXPECT_ORDERLY_REMOVAL as value, the drive is removable.

Moreover the code example show how to open device handle which you can use with DeviceIoControl function to retrieve a lot of useful information which you can need. IOCTL_STORAGE_QUERY_PROPERTY (see http://msdn.microsoft.com/en-us/library/ff566997%28v=VS.85%29.aspx) with different QueryType and PropertyId only one example. You can use IOCTL_STORAGE_GET_DEVICE_NUMBER for example to receive storage volumes and their disk number.

If you will have full STORAGE_DEVICE_NUMBER information about your USB device we will be able to find all other information about it with different ways. One of the easiest is: just enumerate all drive letters with QueryDosDevice and query STORAGE_DEVICE_NUMBER for every drive. If you will find full match in STORAGE_DEVICE_NUMBER you will find the drive letter.