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Unlock a region of the stream
Source position: classesh.inc line 1176
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  |