CODEWITHSUNDEEP
.netwinformsc++-clibackgroundworker
capricorn_heitus
capricorn_heitus

Reputation: 73

Cancelling BackgroundWorker - Windows Forms (C++/CLI)

I am triggering CancelAsync() method on a button click event to stop a Background Worker in my Windows Form code. The following is the sample code,

// Windows Form

private: System::Void startButton_Click(System::Object^  sender, System::EventArgs^  e) {
        testBgWorker->RunWorkerAsync();
        }

private: System::Void testBgWorker_DoWork(System::Object^  sender, System::ComponentModel::DoWorkEventArgs^  e) {

            CalculateDistance* calcDistance = new CalculateDistance();
        calcDistance->doCalculations();
         }

private: System::Void stopButton_Click(System::Object^  sender, System::EventArgs^  e) {

            testBgWorker->CancelAsync();
         }

// CalculateDistance.cpp   

void CalculateDistance::doCalculations() {
    for (int i=0; i<1000, i++) 
    {
        // some calculations here
    }
}

How can I cancel the BackgroundWorker (exit from for loop)? CancelAsync() doesn't seem to do the job.

Thanks.

Upvotes: 0

Views: 1006

Answers (1)

paparazzo
paparazzo

Reputation: 45096

You need to check for cancel in the CalulateDistance loop. In C# it looks like this. Some good examples on msdn.microsoft.com. And you need to mark the backgoundworker as support cancelling.

 if (worker.CancellationPending)
        {
            e.Cancel = true;
            return "cancelled";
        }

Upvotes: 2

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