Details

This message is generated when a file operation is requested for a file that is not currently open.
A file can be opened using OpenRead, OpenWrite, or OpenAppend.
Off[message] switches off the message; On[message] switches it on. For example: Off[General::openx].

Examples

The argument in Read does not correspond to a stream that is open for reading:

Wolfram Language code: Read["DATA"]

An open stream can be created from a string using StringToStream:

Wolfram Language code:

Module[{s, result}, 
	s = StringToStream["{1,2,3}"];
	result = Read[s];
	Close[s];
	result
	]

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