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CM_Get_Device_ID_Size function

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

Syntax

C++


CMAPI
CONFIGRET
WINAPI CM_Get_Device_ID_Size(
  _Out_ PULONG  pulLen,
  _In_  DEVINST dnDevInst ,
  _In_  ULONG   ulFlags
);

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.

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 function should be called to determine the buffer size required by CM_Get_Device_ID.

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 the local machine, see CM_Get_Child.

Requirements

Target platform	Universal
Version	Available in Microsoft Windows 2000 and later versions of Windows.
Header	Cfgmgr32.h (include Cfgmgr32.h)
Library	Cfgmgr32.lib; OneCoreUAP.lib on Windows 10
DLL	CfgMgr32.dll