Suspending a backgroundworker

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Jakanapes - 03 May 2006 17:26 GMT

Is it possible to suspend the background worker without cancelling it
or letting it finish and restarting?

My application runs in a loop and I'd like to have a pause button, but
I'm having trouble getting it to work.

I tried to create a loop based on a variable that gets set to false
when pause is pressed so the worker will finish working, and then call
the backgroundWorker1->RunWorkerAsync() again, but this doesn't seem to
work. I check the IsBusy flag, but my app locks up.

Any ideas?

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Jakanapes - 03 May 2006 19:18 GMT

Well, I tried using the cancelling functions of background worker and
it ALMOST works...

When the user presses pause, it calls this, of course:

backgroundWorker1->CancelAsync();

and in my function:

while( true )
        {
            if( worker->CancellationPending )
            {
                e->Cancel = true;
                break;
            }
            else
            {
//some stuff

                worker->ReportProgress( 100, (System::Object^)%output );
}

It'll stop just fine when pause is pressed, but when start is pressed
again( calling backgroundWorker1->RunWorkerAsync(); ) the program
freezes.

If I remove the while( true) and brackets from the function, I can call
it multiple times from the start button.

And if I remove the worker->ReportProgress call from the loop, I can
press pause and start multiple times without freezing the app. I know
it's not the code in backgroundWorker1_ProgressChanged because I've
commented that out and it still froze when worker->ReportProgress was
called.

Any ideas?

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Suspending a backgroundworker

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