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Inter-Process Communications
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Email
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| Submitted on: |
6/13/2000 2:41:02 PM |
| By: |
Roger D Taylor
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| Level: |
Advanced |
| User Rating: |
By 16 Users |
| Compatibility: |
VB 5.0, VB 6.0 |
| Views: |
29610 |
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OK, we've all been in the situation where you want a multi tread application but since VB is single threaded it is difficult to do, so you create a second vb app and line the two together using winsock .... this is slow and you my be woring in a machine that does not have IP installed .... what choices do you have ..... well you can use pipes, winsock as i've already mentioned and you can also use Read/WriteProcess memory, these are time consuming and difficult to understand and write ..... but hey, what about SendMessage.... yep that good old API call. it allows you to send a data structure to an other process ..... which is fast and the message will always get there .... this code gives you a quick example of how to do this..... hope you fins this code useful ....
You may find that quitting the Client Application after you have sent the message wil cause your VB IDE to crash with a Memory exception .... if you click the control box on this form it might not crash the IDE ... this does not happen as an EXE
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Other 4 submission(s) by this author
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Other User Comments
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 6/13/2000 4:45:22 PM: Stephan Kirchmaier
The best thing I've ever saw on PSC!
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6/13/2000 4:54:41 PM: Roger Taylor
Glad you like it .....
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6/13/2000 6:34:20 PM: webmaistre_alain
a REALLY good piece of code. I will be able to awake the second processor of my bipro with VB ;-)
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6/13/2000 6:35:22 PM: webmaistre_alain
a REALLY good piece of code. I will be able to awake the second processor of my bipro with VB ;-) thanks
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6/14/2000 7:59:50 AM: Erik Forbes
Very nice! :) Solved a couple delimahs for me, actualy. :p
You may want to note to others that they should not use the VB Development Environemnt's 'Stop' button or command any time before calling the 'unhook' function. This crashes VB. :p
Thanks,
Erik Forbes
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6/14/2000 8:24:13 AM: Roger Taylor
Thanks for the note Erik, I made nodes about this problem on the submission form for this item ... it just does not seem to be printed for some reason ......
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6/27/2000 5:34:44 PM: Mike
I dont know if its just me but if the function on the client form has a do loop in it it will not execute the other subs on the other forms till it exits the do in the first one hence this is not 'threading' sorry help me if im wrong
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6/27/2000 5:40:28 PM: Mike
please disregard post it was for a different project sorry.
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7/26/2000 9:50:13 AM: Harry
Why not do Multithreading using Active-X EXE Server in VB? I think it is a better approach than this one...Am i right?
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7/27/2000 7:37:10 AM: The Author of the Code
Harry, The Point of this is not just multithreading, its an example of how to get two completly different applications to talk to one another.
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9/21/2000 8:27:09 AM: marvin
coooool just what I was looking for !
I have two programs that access an SQL Database the one Program stores data into the database (from the serial port) and the other is for looking up the data... the storing program has to inform the reading program when new data arrived.. I first used sendkeys() but that was crappy.... now it's excellent ! good work !
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12/23/2000 10:02:29 PM: Anthony
Is it just me or does this program lock because it won't unhook
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12/30/2000 2:14:58 PM: Roger D Taylor
I guess its just you mate, and it does unhook correctly.
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6/16/2001 9:29:01 AM: xeek
what about dde connections?
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6/19/2001 5:47:19 AM: roger_d_taylor
DDE is ok, but its a nasty beast, this way is much simpler.
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9/4/2002 7:17:33 AM:
Hi Roger,
I can not open the project1.vbp neither the clientapp.vbp. I am getting an error like
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9/4/2002 7:21:37 AM:
Hi Roger,
After trying to load your application with VB5.0 sapnish version I am getting the following error in both .vbp: "The clue "retained" does not exist. Impossible to open project".. Do you know how can I solve this problem?
Thanks,
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12/2/2003 12:42:13 AM: SoloSoftware
It works OK if you are the builder of both apps, however if you take out the hook function from the client the communication fails.
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