[DUG] Sending data between process on same computer on windows

[Conor Boyd]

I've already given you one scenario (although I admit it's not one
that's going to bother most people), and couldn't find any doco anywhere
to describe why Send/PostMessage failed in that instance.
 
Another scenario was described on the page I linked to: "The easiest way
to do such IPC (inter process communication) is to use the message APIs
like FindWindow + PostMessage. Unfortunately messages may not work
inside of non interactive service/system processes in the NT family."
 
C.

________________________________

From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
On Behalf Of Leigh Wanstead
 
May I ask why sendmessage is not reliable? In what situation will cause
sendmessage fail to break the communication?

	-----Original Message-----
	From: delphi-bounces at delphi.org.nz
[mailto:delphi-bounces at delphi.org.nz]On Behalf Of Myles Penlington
	

	 

	The devil is in the detail in this kind of stuff, and your
actual implementation can have a great effect.

	As implied, the best method will be to develop 2 or 3 different
methods, test and compare the results.

	 

	 

	From: delphi-bounces at delphi.org.nz
[mailto:delphi-bounces at delphi.org.nz] On Behalf Of Conor Boyd
	

	 

	Sorry Leigh, I haven't done enough testing with big volume
messages to be able to answer that for you.

	 

	I was more interested in something that worked and was reliable.

	 

	Cheers,

	 

	Conor

	 

	
________________________________


	From: delphi-bounces at delphi.org.nz
[mailto:delphi-bounces at delphi.org.nz] On Behalf Of Leigh Wanstead
	 

	May I ask which is faster, ipc or sendmessage?

		-----Original Message-----
		From: delphi-bounces at delphi.org.nz
[mailto:delphi-bounces at delphi.org.nz]On Behalf Of Conor Boyd
		 

		I found the IPC functionality from madshi.net
(http://help.madshi.net/IPC.htm <http://help.madshi.net/IPC.htm> ) to
work very nicely.

		 

		I needed a way to send messages from a screensaver I was
writing to another process on the same box, and SendMessage didn't seem
to work when a screensaver was active (which I found strange, but
anyway...), and the IPC stuff from madshi works flawlessly.

		 

		
________________________________


		From: delphi-bounces at delphi.org.nz
[mailto:delphi-bounces at delphi.org.nz] On Behalf Of Leigh Wanstead
		 

		May I ask what is the fastest way to send data between
process on same computer on windows? I assume sendmessage api faster
than semaphore waiting, of course faster than TCP/IP which will go
through huge amounts of tcp/ip stack. I just want lowest overhead on per
call. Anyone have any experiences on that?

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