How to do independent progress bar?

Kukulkan · **Posted:** Fri Apr 13, 2012 8:45 am

I have to call a DLL function which uses up to 20 seconds. I want to give the user some feedback, that it is still working. No, there is no callback for that DLL function.

I thought about adding a simple ProgressBarGadget() and using a thread to update the status. If the DLL is finished, I can terminate the thread and remove the progress bar. So far, the idea is easy, but I think I will have problems updating a gadget from a thread, right? Is it a risk to try to update the progress bar using SetGadgetState() from inside a thread (cross plattform)? Or is this absolutely ok?

Kukulkan

J. Baker · **Posted:** Fri Apr 13, 2012 8:51 am

Don't know if this will help you but I was able to do it without a thread on OS X. Read last post here...
viewtopic.php?f=13&t=47122&hilit=progressbar

dige · **Posted:** Fri Apr 13, 2012 12:36 pm

I guess it will be OK. I did this in several cases with no problems (but windows only).
For more safety, you can open a new window inside the thread and create the gadget there.

Kukulkan · **Posted:** Fri Apr 13, 2012 2:00 pm

My implementation is always crashing on SetGadgetState() inside the thread. I compile threadsave but nothing helped. I'll try the idea to do it in a seperate window which is opened by the thread itself. Maybe this helps...

Thanks anyway,

Kukulkan

idle · **Posted:** Fri Apr 13, 2012 9:18 pm

don't think there's any nice way to do it threaded on linux
can you thread the loading of the dll instead?
then you could open a new window with a progress bar

Kukulkan · **Posted:** Mon Apr 16, 2012 7:21 am

Hi,

is it allowed to utilize a DLL, that was loaded and initialized in the main thread, out from a thread?

Untested code to describe my question:

Code:

ProtoType s_getVersion()
Global s_getVersion.s_getVersion

Procedure Thread(SomeVal.i)
  Protected r.i = s_getVersion() ; <-- is this allowed in a thread?
  If r.i > 0
    Debug PeekS(r.i, -1, #PB_Ascii)
  EndIf
EndProcedure

Libname.s = "SomeLibrary.dll"
; init in main thread
hLib.i = OpenLibrary(#PB_Any, Libname.s)
s_getVersion = GetFunction(hLib, "getVersion")
CreateThread(@Thread(), 0)

Is this allowed or are there also drawbacks on different operating systems?

Kukulkan

PMV · **Posted:** Mon Apr 16, 2012 8:31 pm

There should be no big difference between the 3 OS, but of
course i have no experience, except on windows. If a DLL is
thread-safe or not is up to the DLL-author.

A single call to one function from a DLL is no problem. After
OpenLibrary(), the functions are available from every thread.

MFG PMV

Kukulkan · **Posted:** Tue Apr 17, 2012 6:21 am

Thank you. Upon this, I will try...

Kukulkan

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How to do independent progress bar?

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