[fpc-pascal] Best way to transfer data between applications?
shiruba at galapagossoftware.com
Mon Oct 29 04:52:42 CET 2012
I am familiar with the basic underlying methods available for transferring data between processes on Windows and Unix, i.e. Pipes, Shared memory, and TCP/IP - but what I am not familiar with is any higher level functionality that may be available on FPC.
As an example: I have one application with a daemon that uses the IPC component to write to a file in CSV format, and then the user application reads this (GPS location) data via IPC. Then I have to re-convert this string data into a series of floating point values manually, though. The IPC component doesn't seem to be reliable on all platforms either (it sometimes blocks on OS X, and at least the debug client doesn't seem to work at all on Windows 7).
Another disadvantage is that the sequence of launching the applications matters, and what's more, it seems there can only be one "client" per "server" in many cases.
I would prefer to use built-in functionality, rather than learn yet another library - and if learning a library, I would prefer to use one with lots of users that is actively maintained. Likewise, I would prefer to actually "pass" the data, rather than just pass a pointer to it. I plan to have the processes run on the same machine, so I don't need a solution that works with networking, though that would be fine, of course.
Along the same lines, a convenient way to call functions/procedures with parameters from the "other" process would be greatly appreciated. (i.e. something like RPC that handles OOP).
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