Question

I want to make a program that zip by backup files, but the program hangs when zipping files. I tried to use backgroundworker to execute the work.

this is my code so far:

private: System::Void threadTest_Click(System::Object^  sender, System::EventArgs^  e) {
         debug->Text = L"Zipping...";
         zip->RunWorkerAsync();
         if(zip->IsBusy)
         {
            bkProgress->Increment(20);
            Application::DoEvents();
         }
         //zip->OnDoWork();
     }

This is DoWork code for my backgroundworker:

private: System::Void zip_DoWork(System::Object^  sender, System::ComponentModel::DoWorkEventArgs^  e) {
            //zipping file code here
            refreshAll();
     }

I found out that refreshAll()won’t run and I can’t tell when the thread is stopped, I think I did something wrong here, can you give me some tips, I am really new to CLR. Thanks

Answer 1

if RefreshAll make changes to GUI, you have to take care to the following rule:

Never change the GUI from another thread than the main thread where the Gui was created.

In you case you have to use Form::Invoke method to switch to the main thread like that

this->Invoke(gcnew RefreshAllDelegate(), new Object[] { message });

And of course you have to create a delegate RefreshAllDelegate.