unregisterFileReader

Class: io.reader
Namespace: io

Unregister custom file reader for the Simulation Data Inspector

Syntax

unregisterFileReader(obj,ext)


Description

unregisterFileReader(obj,ext) unregisters the custom file reader specified by obj for the extensions specified by ext. All custom file and workspace variable readers are unregistered when you close MATLAB^®.

Tip

To verify the unregister operation, use the io.reader.getRegisteredFileReaders method or the io.reader.getSupportedReadersForFile method.

Input Arguments

obj — Custom data reader

io.reader subclass object

Custom data reader, specified as an object of a class that inherits from the io.reader base class.

Example: MyCustomFileReader

ext — File extensions supported by custom reader

character vector | string | cell array of character vectors | cell array of strings

File extensions supported by custom reader, specified as a character vector, string, cell array of character vectors, or cell array of strings.

Example: [".xlsx" ".xls"]

Data Types: char | string | cell

Examples

Register Custom File Reader for the Simulation Data Inspector

This example shows how to register a custom file reader with the Simulation Data Inspector, verify registration was successful, and unregister a file reader.

Register the Custom File Reader

This example registers the file reader ExcelFirstColumnTime. For an example that shows how to author the custom file reader, see Import Data Using Custom File Reader. As the name suggests, the custom file reader for this example supports Microsoft® Excel® files. Register the reader for the .xlsx and .xls extensions.

registerFileReader(ExcelFirstColumnTimeReader, [".xlsx" ".xls"]);

Verify Custom Reader Registration

To verify registration of a custom reader, you can use the io.reader.getRegisteredFileReaders method or the io.reader.getSupportedReadersForFile method.

The io.reader.getRegisteredFileReaders returns a string array that contains the names of all registered custom file readers.

io.reader.getRegisteredFileReaders

ans = 
"ExcelFirstColumnTimeReader"

You can also use the io.reader.getSupportedReadersForFile method to see all reader options for a specific file. The built-in option in the returned string array indicates that the Simulation Data Inspector has a built-in Excel file reader.

 io.reader.getSupportedReadersForFile('CustomFile.xlsx')

ans = 1×2 string
    "ExcelFirstColumnTimeReader"    "built-in"

Unregister a Custom File Reader

To unregister a custom file reader, use the unregisterFileReader method. All custom readers are unregistered when you close a MATLAB® session.

unregisterFileReader(ExcelFirstColumnTimeReader, [".xlsx" ".xls"])

Version History

Introduced in R2020b