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IWMDMDevice::GetType

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The GetType method retrieves the operations supported by the device.

Syntax

HRESULT GetType(DWORD*pdwType);

Parameters

pdwType

[out]  Pointer to a DWORD specifying the device type attributes. The possible values returned in pdwType are defined in the following table. Microsoft recommends setting both WMDM_DEVICE_TYPE_SDMI and WMDM_DEVICE_TYPE_NONSDMI flags.

Device type Description
WMDM_DEVICE_TYPE_PLAYBACK The media device supports audio playback.
WMDM_DEVICE_TYPE_RECORD The media device supports audio recording.
WMDM_DEVICE_TYPE_DECODE The media device supports audio format decoding.
WMDM_DEVICE_TYPE_ENCODE The media device supports audio format encoding.
WMDM_DEVICE_TYPE_STORAGE The media device has on-board storage for media files.
WMDM_DEVICE_TYPE_VIRTUAL The media device is not a physical device.
WMDM_DEVICE_TYPE_SDMI The media device can accept SDMI-protected content.
WMDM_DEVICE_TYPE_NONSDMI The media device can accept non-SDMI content.
WMDM_DEVICE_TYPE_NONREENTRANT The media device must synchronize access to Windows Media Device Manager services.
WMDM_DEVICE_TYPE_FILELISTRESYNC The media device allows the file list to be resynchronized.
WMDM_DEVICE_TYPE_VIEW_PREF_METADATAVIEW The media device prefers metadata views while its storages are enumerated.

Return Values

The method returns an HRESULT. All the interface methods in Windows Media Device Manager can return any of the following classes of error codes:

  • Standard COM error codes
  • Windows error codes converted to HRESULT values
  • Windows Media Device Manager error codes

For an extenstive list of possible error codes, see Error Codes.

Possible values include, but are not limited to, those in the following table.

Return code Description
S_OK The method succeeded.
E_INVALIDARG The pdwType parameter is an invalid or NULL pointer.
E_FAIL An unspecified error occurred.

Remarks

The current Microsoft service providers may not provide reliable information about devices, except WMDM_DEVICE_TYPE_NONSDMI or WMDM_DEVICE_TYPE_SDMI. All devices will be reported as supporting the former; devices that support serial numbers also return the latter.

Requirements

Header: Defined in mswmdm.h.

Library: mssachlp.lib

See Also

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