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Interprocess Messaging in Windows

We are facing a problem in sending messages between two different EXEs on the same machine using WIN API.

The sending EXE uses PostMessage or PostThreadMessage to send a user defined message to the target process. This operation completes successfully, as per the errorcode.
But the target EXE, which uses PeekMessage API to read the message never gets this message.

It would be great if someone could throw some light on what could be the problem or a better way to implement this. We are using Delphi 6.0 to implement this.

Thanks in advance.

PaulCaswell

I came across something simillar a while ago and eventually used CreateFileMapping as the main transport between the processes. I actually used both as in my scenario, many processes talked amongst themselves so I used the shared file as the data transport system and posting messages to inform target processes of pending messages. If this is something you could use, let me know and I'll post some source.

Paul

cookre

If your message code is some WIN_USER+x, I'd suggest using RegisterWindowMessage():
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/messagesandmessagequeues/messagesandmessagequeuesreference/messagesandmessagequeuesfunctions/registerwindowmessage.asp?frame=true

MS is starting to use some codes above WIN_USER, so custom codes now have to be explicitly registered.

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