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how do I raise an event?

Posted on 2004-09-13
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Last Modified: 2011-10-03
I use VB 6.0   I see that there are multiple places that I have to put code to handle events and
I keep getting it wrong.  I want to do I have a form that has a button.  When that button is clicked,
another program that is running at the same time as the first program catches a "p1_button_in"
event and turns a light on.
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Question by:dwcronin
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by:unknown_routine
ID: 12047788
You can not raise an event that happens in the 1st program in the second program.


However you can use Message API functions, so when that event happen in the 1st program

they send it to the second and second program turns the light on.
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by:unknown_routine
ID: 12047801
Another easier ways is that when event happens in the 1st program it writes a flag variable to  a textfile and

seconds program check that files to do some action.
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by:unknown_routine
ID: 12047810
if still unclear,
please explain more clearly.
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Author Comment

by:dwcronin
ID: 12047874
I was trying to avoid something like writing to a file.  That is going to use disk access and I know that is slow.
I am trying to get the second program to respond immediately to the first programs button click.
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Erick37 earned 125 total points
ID: 12048094
This sample may help you:

Share Data Between Apps Without COM
http://www.thescarms.com/vbasic/PassString.asp
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by:unknown_routine
ID: 12048187
Then Consider writing and readiing from the registry which is very fast.

if you need the code I can supply it here.

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by:aParser
ID: 12048550
What you're talking about -- I think -- is interprocess communication.  There are many ways to do it, one of the most common is the textfile approach that unknown_routine gave you.

The approach that I used under NT 4.0 is to use mailslots.  The more modern approach is to use Microsoft Messaging.

You could also use callbacks.  It is a slightly more sophisticated approach, but one that requires a fair amount of coding.
http://msdn.microsoft.com/library/en-us/vb98/html/vbsmpCallback.asp?frame=true

You could also do something like store the hWnd of your "lightbulb" program, then when your "click" application starts, you read the hWnd (or title) from whereever you've stored it.  When the user clicks the button in the "click" application, you make the "lightbulb" application the foreground application and use SendKeys to send a key sequence that activates your lightbulb.

You could also look at the SendMessage and PostMessage APIs.  This would be a very low-level approach.
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