question about sockets

Dar Scott dsc at swcp.com
Mon Oct 28 10:15:01 EST 2002


On Monday, October 28, 2002, at 03:21 AM, Björnke von Gierke wrote:
>
> I am trying to do some connection stuff using the open socket, write to 
> socket, and accept socket in their datagram form.
> I run a by connecting to my own Jaguar mac, but I only can get one message 
> through and I really don't know what's wrong...

There is a bug in Revolution 1.1.1 concerning datagrams.  Also there are 
features in Revolution 2.0 that will require more work.

This is based on 10.1.x and I assume it will work the same on Jaguar.

In OS X for Revolution 1.1.1 you get a false message when you do the accept 
and you get only one more.

The workaround is two parts:  You need to throw away the false message and 
reopen the accept.  The false message is always empty, so if yours is never 
empty, you can test on that in deciding to throw away a datagram.  After 
you get the real message you need to close the accept and open it again.

To be ready for Revolution 2.0, you should also "close socket" the 
connectionID you get with the callback and ignore the error.  (Or test on 
version.  Or make a note to yourself.)

On Revolution 2.0 you will be able to send datagrams back and receive 
datagrams sent back on that same "connection" identified by the 
connectionID in the callback.  To support this a "connection" is opened for 
you just before the callback.

I have heard a rumor of another potential problem that might show up in 2.
0.  A Revolutionary made several standalones using the new engine and ran 
them on the same computer.  One sent datagrams to the others.  Sometimes 
one of the others would not receive the datagram until its window was 
clicked.  (I may have added my own confusion to this rumor.)  There have 
been lots of engine changes recently, so this may have been taken care of.

Other than these OS X problems which will go away soon, the use of 
datagrams looks very good on Revolution.

Dar Scott




More information about the Use-livecode mailing list