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Lock a region of bytes in the stream
Source position: types.pp line 324
function IStream.LockRegion(  | 
libOffset: LargeUint;  | 
cb: LargeUint;  | 
dwLockType: DWORD  | 
):HRESULT;  | 
LockRegion locks a region of the storage, starting at libOffset, for cbCount bytes. The applied lock is of type dwLockType. The function returns zero if the lock was successfully applied.
On error, a nonzero exit code is returned.