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Java Forum / General / January 2006Unable to know if a socket is closed
Hello ! When I close a socket from a side of it with <code> socket.getInputStream().close(); socket.getOutputStream().close(); socket.close(); </code> it seems to be impossible to detect this closing from the other side. All the methods socket.isBound() socket.isConnected() socket.isClose() returns true. And no exception is thrown when I try to read from this socket. Does someone ever deal with that stuff? Thanks. -o-- > When I close a socket from a side of it with > [quoted text clipped - 15 lines] > > Does someone ever deal with that stuff? The methods isClosed() etc only tell you the state of the Socket *object* itself, not the state of the underlying socket, i.e. they tell you whether you've called the corresponding close() method. To determine whether a socket connection is still active, you must attempt to read from it or write to it. Depending on what mechanism you use, you may get an exception or simply a value indicating EOF. Read the appropriate documentation. /gordon.  Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e Indeed when the socket is closed the read() method returns -1. But in my application context this just does mean there is nothing to read, i.e. I can't conclude my socket has been closed by the other side with that returned code :-( Another idea? Thanks. -o-- > Indeed when the socket is closed the read() method returns -1. > > But in my application context this just does mean there is nothing > to read, i.e. I can't conclude my socket has been closed by the > other side with that returned code :-( If InputStream.read() returns -1, it means you have reached EOF. It does not mean there is nothing to read at the moment, it means you will never be able to read data from the socket again. Exactly what class and method are you using to read from your socket? /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e I'm using the method read(char[], int, int) on an object BufferedReader BufferedReader m_inputStream = new BufferedReader( new InputStreamReader(socket.getInputStream())); -o-- > I'm using the method read(char[], int, int) on an object BufferedReader From the API documentation for BufferedReader.read(char[], int, int): Returns: The number of characters read, or -1 if the end of the stream has been reached. With emphasis: the *end* of the stream. There will be no more data on this stream, ever. /gordon Signature[ do not email me copies of your followups ] g o r d o n + n e w s @ b a l d e r 1 3 . s e Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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