ILockBytes::UnlockRegion

Removes the access restriction on a previously locked range of bytes.

HRESULT UnlockRegion(

ULARGE_INTEGER libOffset,	//Specifies the byte offset for the beginning of the range
ULARGE_INTEGER cb,	//Specifies the length of the range in bytes
DWORD dwLockType	//Specifies the access restriction previously placed on the range
);

Parameters
libOffset

[in]Specifies the byte offset for the beginning of the range.

[in]Specifies, in bytes, the length of the range that is restricted.

dwLockType

[in]Specifies the type of access restrictions previously placed on the range. This parameter uses a value from the LOCKTYPE enumeration.

Return Values
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.

Comments
This method unlocks a region previously locked with the ILockBytes::LockRegion method. Locked regions must later be explicitly unlocked by calling ILockBytes::UnlockRegion with exactly the same values for the libOffset, cb, and dwLockType parameters. Two adjacent regions cannot be locked separately and then unlocked with a single unlock call.

See Also
ILockBytes::LockRegion, LOCKTYPE

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