On Sunday, July 27, 2003, at 02:26 PM, Jez wrote:
Is it possible to send/receive messages between two independent
applications built in Revolution? Or do they have to be merged and built
as a single executable?
There are some platform specific solutions that others can address much better than I.
1.
There is a group working on general IPC (and RPC) for Revolution. Progress is slow. There are many observers, a few are involved in discussion, and at the moment just three are active, one of whom seems to generate more words than real product. (me)
2.
The "open process for update" based communication might work on some platforms. It does not work well enough for me to use on Windows. For some situations, shell() may work, but there are some limitations to stdin and stdout, anyway.
3.
On most platforms and often between platforms there are ways to communicate using files, but it can get tricky.
4.
The most general approach is to use tcp/ip. This will work for intra-computer communication as well as that between computers. However, it does require tcp/ip to be set up on the computer and for isolated computers or those with occasional dialup adaptors, only, this setup can be a little tricky. I think the most important product of #1 above will be something along this line.
In the mean time I have a script library I may just give away if there is an interest. It is called "Simple Remote Send". It allows one application to send a message to a stack in another application. It has no security. It uses UDP, so you can lose messages if you send too many too fast or send across an unreliable medium. The caveats in the comments take up more lines than the actual handlers. To improve reliability, this should be enhanced to handle TCP. This may be blocked by firewalls on the Internet and even many WANs, and an enhancement should include a channel established by a "client" for two-way communications if this is needed. As it is, any program that accepts remote messages leaves its computer open to attack from any attacker who reads the script and can send general UDP packets into your net, so use this only behind a firewall or on an isolated LAN or computer.
Dar
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Dar Scott Consulting http://www.swcp.com/dsc/ Programming Services
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