Question

I’m building an app in Visual C++ 2008 Express Edition, a Windows forms app, hence using Managed C++/CLI.

I’m new to this and need guidance on the following:

I have a function that basically reboots a HID interface device. I want to show a progress bar (kind of a dummy progress bar for about 30 seconds) that progresses every second to 30 counts. After this is over, I want the code after all this to execute.

I tried doing this with the System.Windows.Forms timer and it just executes the code right after the timer->Enabled = true event.

Here is some code if it helps:

   private:System::Void hidReboot(System::Void) {
    System::UInt16 res = 0;

    //bring up form to display progress bar

    res = SendRebootCmd();
    if (res == true)
    {
        timer1->Enabled = true; //in this tick event..i have the progress bar stuff
        //some other code here
    }
}

So basically, where the comment says //some other code here, I want to do that only when the progress bar is done and the timer has counted up to 30 ticks (1 second tick increments – 30 seconds).

I’ve tried putting a while loop there, but I can’t use that as it hangs the UI thread, thus not raising the tick event of the timer.

Any suggestions, readings or tips would be greatly appreciated. Thanks!

Answer 1

You should not put any kind of wait into that function. Just start the timer and then exit the function.

Add the remainder of the function in the timer with a check that determines if the countdown has finished.