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SendMessage to service application (delphi  7)

Posted on 2009-05-05
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Last Modified: 2012-06-27
how can I send a message using SendMessage to a service application? it looks like the FindWindow doesnt find any window.

I dont want to use TCP/IP communication. I just need a quick way to send a short message without arguments to the service.
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Question by:WebWolf1
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by:Johnjces
ID: 24307054
Have a look at this Q still up on EE.

http://www.experts-exchange.com/Programming/Languages/Pascal/Delphi/Q_24376994.html

There is a link, I think, for SimpleIPC which uses FindWindow (source is included) that might help you and the entuire thread might be of assistance. Her is some of my info.....

If you do not want to use TCP/IP you could use mailslots which are not like email.

I have used them (mailslots) and they work just great.

You could also use a components called TssSimpleIPC from SunnisSoft. This uses WIndows Messaging (added via FindWindow).

http://www.sunisoft.com
http://www.torry.net/vcl/system/appscommunications/simpleipc.zip

It works very well in services and applications and it is free. Not sure what version of Delphi so could take some tweaking in newer versions.

John
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by:Johnjces
ID: 24307093
Added...

I must add that I have never used FIndWindow to "talk" to a service. I am pretty certain that you cannot talk to a service from an application using findwindow since a service does not have a window to find.

From service to application seems to work great for me and I had no problems in Vista either.

You will have to use a mailslot component. Look on torry or delphipages for mailslots.

John
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Expert Comment

by:Hypo
ID: 24333464
If you for some reason can't send Windows messages to the service (like if the service don't have a window handle), then you could have your service create a named pipe, to which your other applications then can connect to and send messages. (I think this is quite a common way to communicate with services).
Rlibby (who is an expert in this forum), has created and published a vary good unit that can help you with pipe communication. To download, goto http://home.roadrunner.com/~rllibby/source.html, and get the file pipes.zip.

regards
Hypo
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WebWolf1 earned 0 total points
ID: 24365137
You are both wrong. FindWindow works well in services unless you know the class name.
I fixed it.
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