Hello,
I have a worker thread that needs to call a method that only works on the
main/UI thread. One way to accomplish this in managed code is to use
Control.Invoke. However, in my case I don't have a .NET UI control from
which I can call Invoke. I have tried to create a temporary, invisible
Windows form and call Invoke against this, and while this sort of worked, it
highlighted additional problems (which I have not resolved) and is generally
not a very clean solution.
If I were writing in unmanaged code, I would likely use
CoMarshalInterT hreadInterfaceI nStream. I could also post a message back to
the main thread. Is something like this possible in managed code or are
there ways other than Control.Invoke to pass an interface pointer to a
different thread?
One other potential challenge is that my code is not responsible for
starting the secondary thread; it is started by the framework in which my
code executes. For a detailed discussion of what exactly I'm trying to
accomplish, see http://groups.google.ca/group/micros...3ce7d2f03e67e3.
Thanks!
Notre
Dec 12 '05
14  6964 
Notre,
In that thread on Joel's form, I was talking about creating an
implementation of ISynchronizeInv oke for worker threads. I'm not sure
that would help your current problem, however, as you are trying to
marshall back to the main ui thread.
If you are using .NET 2.0, I think that there is some static class that
lets you marshall to the main ui thread without a Control. I haven't
gotten to play much with 2.0, but I remember stumbling on something
like that when I was trying 2.0 out... I'm taking a breif look at
MSDN2, but I can't seem to find it right now.
Sean
Notre Poubelle wrote: Hi Charles,
Thanks for the response and the link. I did review the reference, but to be
quite honest I don't know if I followed everything that was said there.
I'm not sure if I could implement the ISynchronizeInv oke interface. The
only implementation I could find of this was in System.Windows. Forms.Control.
I started to look at the Invoke method with a disassembler, but got lost in
all the details. I'd hate to have to redo all the work MS did in
implementing this, although maybe that's the only way, short of creating a
temporary form and (somehow) resolving the other problems that I've run into
using that approach.
Notre
Hi Sean,
Thanks for your reply. I am using .NET 2.0, so if such a static class does
exist, it would be perfect for my needs! I'll have a look around in the docs
and if I can't find it, I'll start a new discussion thread to see if anyone
else knows about it.
Notre
Hi Notre
I think, as has probably been said elsewhere, the reason why forms and
controls can be so readily interrupted is that they have a message loop. If
we are just talking about a bespoke class then, unless it has an idle
period, it cannot be interrupted. The class would have to, periodically,
look for some signal that another process was trying to do stuff. If it is a
worker thread then it could explicitly look for a signal each time round its
processing loop.
Charles
"Notre Poubelle" <no************ @online.nospam> wrote in message
news:B7******** *************** ***********@mic rosoft.com... Hi Charles,
Thanks for the response and the link. I did review the reference, but to
be
quite honest I don't know if I followed everything that was said there.
I'm not sure if I could implement the ISynchronizeInv oke interface. The
only implementation I could find of this was in
System.Windows. Forms.Control.
I started to look at the Invoke method with a disassembler, but got lost
in
all the details. I'd hate to have to redo all the work MS did in
implementing this, although maybe that's the only way, short of creating a
temporary form and (somehow) resolving the other problems that I've run
into
using that approach.
Notre
Hi Sean
I am having the same problem: i need to raise events from worker thread
to the main thread(not UI thread) in the main thread's context.
The static class that was suggested earlier is probably:
Synchronization Context that works perfectly with the UI thread but ONLY
with it(probably because it works with the windows message queue and
worker threads does not have that). although docs mentioned otherwise.
BTW BackgroundThrea d uses this class so it also good only for UI main
threads.
Other thoughts i am having are:
1)implementing message pump for the worker thread so it could receive
windows messages
2)Poll shared queue for incomming messages from the worker thread(i'd
hate to do that since i want the user to be free of that)
I will be more then happy to hear if u found any other solution since i
am frustrated about this situation.
Regards
Shay
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