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ua.filestream.TuaStream.uaFileOpen

uaFileOpen is used to open a file represented by an Object of FileType.

procedure uaFileOpen(Mode: uaByte = uafmOpenWrite);
__fastcall uaFileOpen(uaByte Mode = uafmOpenWrite);

It calls the OPC UA Open method. 

You can find the description at: https://reference.opcfoundation.org/Core/Part20/v105/docs/4.2.2

dOPC version 5.33. Copyright © 2025 by Kassl GmbH.