FileHandle class has a lot of deprecated methods. What do I use instead?

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Created Aug ’21

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In Swift the FileHandle class has a lot of deprecated methods. For example: FileHandle.close FileHandle.readDataToEndOfFile both are marked as deprecated.

What are supposed to use?

Answered by Claude31 in 685770022

At the end of FileHandle documentation page, you have the list of instance methods that you can use:

func close()
func offset() -> UInt64
func read(upToCount: Int) -> Data?
func readToEnd() -> Data?
func seek(toOffset: UInt64)
func seekToEnd() -> UInt64
func synchronize()
func truncate(atOffset: UInt64)
func write(contentsOf: T)

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Answer 1

OOPer OP

Aug ’21

FileHandle.close (FileHandle.closeFile() ?) -> close() throws

(As far as I checked, close() is not deprecated.)

FileHandle.readDataToEndOfFile -> readToEnd() throws

The header doc says that deprecated APIs may throw exceptions (this means Objective-C exceptions which cannot be handled in Swift safely). So their replacements may very probably be throws-methods which may throw Swift errors and can be handled in Swift safely.

You would be able to find replacements searching in Instance Methods in the documentation of FileHandle.

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Answer 2

Claude31 OP

Aug ’21

Accepted Answer

At the end of FileHandle documentation page, you have the list of instance methods that you can use:

func close()
func offset() -> UInt64
func read(upToCount: Int) -> Data?
func readToEnd() -> Data?
func seek(toOffset: UInt64)
func seekToEnd() -> UInt64
func synchronize()
func truncate(atOffset: UInt64)
func write(contentsOf: T)

0