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.
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。