Partager via

ILockBytes::UnlockRegion (Compact 2013)

  • Article

3/26/2014

This method removes the access restriction on a range of bytes previously restricted with the ILockBytes::LockRegion method.

Syntax

HRESULT UnlockRegion( 
  ULARGE_INTEGER libOffset, 
  ULARGE_INTEGER cb, 
  DWORD dwLockType 
);

Parameters

  • libOffset
    [in] Byte offset for the beginning of the range.
  • cb
    [in] Length, in bytes,of the range that is restricted.

  • dwLockType
    [in] Type of access restrictions previously placed on the range.

    This parameter uses a value from the LOCKTYPE enumeration.

Return Value

The following table shows the return values for this method.

Value

Description

S_OK

The byte range was unlocked.

STG_E_INVALIDFUNCTION

Locking is not supported at all or the specific type of lock requested is not supported.

STG_E_LOCKVIOLATION

The requested unlock cannot be granted.

Remarks

ILockBytes::UnlockRegion unlocks a region previously locked with a call to ILockBytes::LockRegion.

Each region locked must be explicitly unlocked, using the same values for the libOffset, cb, and dwLockType parameters as in the matching calls to ILockBytes::LockRegion.

Two adjacent regions cannot be locked separately and then unlocked with a single unlock call.

To determine whether the platform supports this interface, see Determining Supported COM APIs.

Requirements

Header

objidl.h,
objidl.idl

Library

ole32.lib,
uuid.lib

See Also

Reference

ILockBytes