readme.txt

局域网消息广播

局域网消息广播
ALMailSlot v1.06
----------------

Description:

        ALMailSlot is a component which allows applications to send messages
        across a network using mailslots.


Published Properties & Events:

        Active          When set to True, the component will send and receive
                        new messages.

        CheckInterval   How often the component will check for and read new
                        messages, in milliseconds.

        MailBox         An 8 character name that specifies the mailbox which
                        the mailslots will be sent through.

        ThreadPriority  The priority of the thread that checks for new
                        messages.

        OnNewMessage    This event gets triggered when a new message is
                        received. The machine sending the messages passes its
                        computer name, user name, and the actual message
                        text.


Public Properties & Procedures:

        Broadcast       This procedure will broadcast the given text too all
                        machines.

        SendMessage     This procedure will send the given text to the
                        specified recipient (computer name).

        Computer        This is the name of the local machine. (Read Only)

        UserName        This is the name of the user currently logged in.
                        (Read Only)


Some notes about mailslots and the component:

Unfortunately, under Windows 95/98 you can only send a maximum of approx. 400
bytes through a mailslot. If you want to send more than 400 bytes, you'll
have to split the message up into multiple messages.

Mailslots will send out messages using all the protocols setup on the machine
that will support message sending. This is why sometimes you receive two (or
more) messages. The only way to get around this problem is to include some
sort of indicator in your message, like a counter or the time sent. So, for
example, you could send out '1Hello', then when the receiving machine gets
the message it will strip the 1 from the start and display the 'Hello'. When
it receives the same message again, it will check to see if it has a '1', if
it does, ignore it because this message has already been received.

The mailbox name cannot be greater than 8 characters in length if you are
using Windows 95. Windows 98 and NT will allow for a mailbox name of 255
characters. This is why I have limited the components mailbox name to 8
characters.


Andrew Leigh ([e-mail])
http://www.alphalink.com.au/~leigh/components