Returns a Boolean value that indicates whether a readable stream has data that can be read without blocking.


func CFReadStreamHasBytesAvailable(_ stream: CFReadStream!) -> Bool



The stream to examine.

Return Value

TRUE if data can be read from stream without blocking, otherwise FALSE. If stream cannot tell if data is available without actually trying to read the data, this function returns TRUE.

See Also

Examining Stream Properties

func CFReadStreamGetBuffer(CFReadStream!, CFIndex, UnsafeMutablePointer<CFIndex>!) -> UnsafePointer<UInt8>!

Returns a pointer to a stream’s internal buffer of unread data, if possible.

func CFReadStreamCopyError(CFReadStream!) -> CFError!

Returns the error associated with a stream.

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