CM_Get_Class_PropertyW function (cfgmgr32.h)

The CM_Get_Class_Property function retrieves a device property that is set for a device interface class or device setup class.

Syntax

CMAPI CONFIGRET CM_Get_Class_PropertyW(
  [in]      LPCGUID          ClassGUID,
  [in]      const DEVPROPKEY *PropertyKey,
  [out]     DEVPROPTYPE      *PropertyType,
  [out]     PBYTE            PropertyBuffer,
  [in, out] PULONG           PropertyBufferSize,
  [in]      ULONG            ulFlags
);

Parameters

[in] ClassGUID

Pointer to the GUID that identifies the device interface class or device setup class for which to retrieve a device property that is set for the device class. For information about specifying the class type, see the ulFlags parameter.

[in] PropertyKey

Pointer to a DEVPROPKEY structure that represents the device property key of the requested device class property.

[out] PropertyType

Pointer to a DEVPROPTYPE-typed variable that receives the property-data-type identifier of the requested device class property, where the property-data-type identifier is the bitwise OR between a base-data-type identifier and, if the base data type is modified, a property-data-type modifier.

[out] PropertyBuffer

Pointer to a buffer that receives the requested device class property. CM_Get_Class_Property retrieves the requested property value only if the buffer is large enough to hold all the property value data. The pointer can be NULL.

[in, out] PropertyBufferSize

The size, in bytes, of the PropertyBuffer buffer. If the PropertyBuffer parameter is set to NULL, *PropertyBufferSize must be set to zero. As output, if the buffer is not large enough to hold all the property value data, CM_Get_Class_Property returns the size of the data, in bytes, in *PropertyBufferSize.

[in] ulFlags

Class property flags:

CM_CLASS_PROPERTY_INSTALLER

ClassGUID specifies a device setup class. Do not combine with CM_CLASS_PROPERTY_INTERFACE.

CM_CLASS_PROPERTY_INTERFACE

ClassGUID specifies a device interface class. Do not combine with CM_CLASS_PROPERTY_INSTALLER.

Return value

If the operation succeeds, the function returns CR_SUCCESS. Otherwise, it returns one of the CR_-prefixed error codes defined in Cfgmgr32.h.

Remarks

CM_Get_Class_Property is part of the Unified Device Property Model.

Requirements

See also

SetupDiGetClassProperty