Problems with API and VB IDE/Compiler
Hello, experts.
I have the following situation:
1. I have made a usercontrol using VB.
2. The usercontrol uses timeSetEvent API function like so:
m_hTmr = timeSetEvent(50, 5, AddressOf pTimerProc, &H0&, PERIODIC + CALLBACK_FUNCTION)
-.The pTimerProc is a procedure, declared in a Module in this project.
-.The pTimerProc refers back to the properties of the UserControl.
3. Everything works just fine while I'm testing it in the VB IDE.
The problem:
When I compile the source and test it, it crashes with "illegal operation" error.
The error comes out exactly when the timer "clicks"
I've heard that there are problems when implementing multi-threading in VB.
Is this the problem here, and how can I solve it?
I have the following situation:
1. I have made a usercontrol using VB.
2. The usercontrol uses timeSetEvent API function like so:
m_hTmr = timeSetEvent(50, 5, AddressOf pTimerProc, &H0&, PERIODIC + CALLBACK_FUNCTION)
-.The pTimerProc is a procedure, declared in a Module in this project.
-.The pTimerProc refers back to the properties of the UserControl.
3. Everything works just fine while I'm testing it in the VB IDE.
The problem:
When I compile the source and test it, it crashes with "illegal operation" error.
The error comes out exactly when the timer "clicks"
I've heard that there are problems when implementing multi-threading in VB.
Is this the problem here, and how can I solve it?
Just as a curiosity (not an answer :-)): what's wrong with SetTimer, and why should you use timeSetEvent?
Just for your information: when I need a timer without a form (e.g. in a class), I usually use this:
http://www.vbaccelerator.com/home/VB/Code/Libraries/Subclassing/SSubTimer/article.asp
library (it's a subclassing helper, but a timer also).
M.
ASKER
Hi, marconovaro.
About the SSubtimer class, I'm familiar with it.
The reason I don't use it in this application - it is too much overload to include it in a short-coded style program. What I mean - In that case I don't neet it's whole functionability, I just need a simple timer.
The difference between the SetTimer and timeSetEvent:
the timeSetEvent function sets a multimedia timer that runs in it's own thread, and the SetTimer function runs in the same thread.
About the SSubtimer class, I'm familiar with it.
The reason I don't use it in this application - it is too much overload to include it in a short-coded style program. What I mean - In that case I don't neet it's whole functionability, I just need a simple timer.
The difference between the SetTimer and timeSetEvent:
the timeSetEvent function sets a multimedia timer that runs in it's own thread, and the SetTimer function runs in the same thread.
ASKER
Another difference is that the SetTimer function posts a message to the message queue, and timeSetEvent calls directly it's callback function.
Julian_K:
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Experts: Post your closing recommendations! Who deserves points here?
Julian_K, an EE Moderator will handle this for you.
Moderator, my recommended disposition is:
Refund points and save as a 0-pt PAQ.
DanRollins -- EE database cleanup volunteer
Moderator, my recommended disposition is:
Refund points and save as a 0-pt PAQ.
DanRollins -- EE database cleanup volunteer
ASKER
Yep, that's ok with me.
Thanks, Dan Rollins.
Thanks, Dan Rollins.
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ASKER
If I use SetTimer/KillTimer API functions instead, everything works fine. Grrrr!!!! (realy angry at Microsoft)