Unlock a region of the stream.
Source position: classesh.inc line 1681
| public function TStreamAdapter.UnlockRegion( | 
| libOffset: LargeUint; | 
| cb: LargeUint; | 
| dwLockType: DWORD | 
| ):HRESULT; virtual; | 
UnLockRegion implements #rtl.types.IStream.UnLockRegion.
This function must be overridden and will raise a runerror 217 when called directly.
| 
 | Unlocks a previously locked region of bytes in the stream. |