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CM_Get_Device_ID_Size_Ex function

The CM_Get_Device_ID_Size_Ex function retrieves the buffer size required to hold a device instance ID for a device instance on a local or a remote machine.

Syntax


CMAPI
CONFIGRET
WINAPI CM_Get_Device_ID_Size_Ex(
  _Out_     PULONG pulLen,
  _In_      DEVINST dnDevInst ,
  _In_      ULONG ulFlags,
  _In_opt_  HMACHINE hMachine
);

Parameters

pulLen [out]

Receives a value representing the required buffer size, in characters.

dnDevInst [in]

Caller-supplied device instance handle that is bound to the local machine.

ulFlags [in]

Not used, must be zero.

hMachine [in, optional]

Caller-supplied machine handle to which the caller-supplied device instance handle is bound.

Note  Using this function to access remote machines is not supported beginning with Windows 8 and Windows Server 2012, as this functionality has been removed.

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

The CM_Get_Device_ID_Size_Ex function should be called to determine the buffer size required by CM_Get_Device_ID_Ex.

The size value supplied in the location pointed to by pulLen is less than MAX_DEVICE_ID_LEN, and does not include the identifier string's terminating NULL. If the specified device instance does not exist, the function supplies a size value of zero.

For information about device instance IDs, see Device Identification Strings.

For information about using device instance handles that are bound to a local or a remote machine, see CM_Get_Child_Ex.

Functionality to access remote machines has been removed in Windows 8 and Windows Server 2012 and later operating systems thus you cannot access remote machines when running on these versions of Windows.

Requirements

Version

Available in Microsoft Windows 2000 and later versions of Windows.

Header

Cfgmgr32.h (include Cfgmgr32.h)

Library

Cfgmgr32.lib

See also

CM_Get_Child_Ex
CM_Get_Device_ID_Ex
CM_Get_Device_ID_Size

 

 

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