Instance Method インスタンスメソッド

readData(ofLength:)

Reads data synchronously up to the specified number of bytes.

Declaration 宣言 

func readData(ofLength length: Int) -> Data

Parameters パラメータ

length

The number of bytes to read from the file handle.

Return Value 戻り値

The data available through the receiver up to a maximum of length bytes, or the maximum size that can be represented by an NSData object, whichever is the smaller. 最大限lengthバイト、またはNSDataオブジェクトによって表現可能な最大限サイズ、どちらかより小さい方に至るまでレシーバを通して利用可能なデータ。

Discussion 議論

If the handle represents a file, this method returns the data obtained by reading length bytes starting at the current file pointer. If length bytes aren’t available, this method returns the data from the current file pointer to the end of the file. If the handle represents a communications channel, the method reads up to length bytes from the channel. Returns an empty NSData object if the handle is at the file’s end or if the communications channel returns an end-of-file indicator.

See Also 参照

Deprecated 非推奨

func readDataToEndOfFile() -> Data
Reads the available data synchronously up to the end of file or maximum number of bytes.
Deprecated 非推奨
func write(Data)
Writes the specified data synchronously to the file handle.
Deprecated 非推奨
var offsetInFile: UInt64
The position of the file pointer within the file represented by the file handle.
Deprecated 非推奨
func seekToEndOfFile() -> UInt64
Places the file pointer at the end of the file referenced by the file handle and returns the new file offset.
Deprecated 非推奨
func seek(toFileOffset: UInt64)
Moves the file pointer to the specified offset within the file represented by the receiver. ファイルポインタをレシーバによって表されるファイル内部の指定されたオフセットに移動します。
Deprecated 非推奨
func closeFile()
Disallows further access to the represented file or communications channel and signals end of file on communications channels that permit writing. 表現されたファイルまたは通信経路へのもっと先のアクセスを禁止します、そして書き込み許可する通信経路上のファイルの終端を合図します。
Deprecated 非推奨
func synchronizeFile()
Causes all in-memory data and attributes of the file represented by the handle to write to permanent storage.
Deprecated 非推奨
func truncateFile(atOffset: UInt64)
Truncates or extends the file represented by the file handle to a specified offset within the file and puts the file pointer at that position.
Deprecated 非推奨
let NSFileHandleNotificationMonitorModes: String
Currently unused. 現在使われません。
Deprecated 非推奨

Related Documentation 関連文書

var availableData: Data
The data currently available in the receiver. レシーバにおいて現在利用可能なデータ。