It will not only measure the raw values, but also give the percentage values and ratios between channels. This zip file has all the examples and a step-by-step manual. I also created a blog page for this code.
This walkthrough illustrates how to use the BackgroundWorker class to perform time-consuming computations "in the background," while the user interface remains responsive. When you are through, you will have an application that computes Fibonacci numbers asynchronously.
Even though computing a large Fibonacci number can take a noticeable amount of time, the main UI thread will not be interrupted by this delay, and the form will be responsive during the calculation.
Tasks illustrated in this walkthrough include: Note The Cai for programming boxes and menu commands you see might differ from those described in Help depending on your active settings or edition. To change your settings, choose Import and Export Settings on the Tools menu. Creating the Project The first step is to create the project and to set up the form.
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In Solution Explorer, right-click Form1 and select Rename from the shortcut menu. Change the file name to FibonacciCalculator. Click the Yes button when you are asked if you want to rename all references to the code element 'Form1'.
Drag a NumericUpDown control from the Toolbox onto the form. Set the Minimum property to 1 and the Maximum property to Add two Button controls to the form. Set its Enabled property to false. Create an event handler for both of the Button controls' Click events.
For details, see How to: Create Event Handlers Using the Designer. Drag a Label control from the Toolbox onto the form and rename it resultLabel. Drag a ProgressBar control from the Toolbox onto the form. Adding Asynchronous Event Handlers You are now ready to add event handlers for the BackgroundWorker component's asynchronous events.
The time-consuming operation that will run in the background, which computes Fibonacci numbers, is called by one of these event handlers. To implement asynchronous event handlers In the Properties window, with the BackgroundWorker component still selected, click the Events button.
For more information about how to use event handlers, see How to: Create a new method, called ComputeFibonacci, in your form. This method does the actual work, and it will run in the background.
This code demonstrates the recursive implementation of the Fibonacci algorithm, which is notably inefficient, taking exponentially longer time to complete for larger numbers. It is used here for illustrative purposes, to show an operation that can introduce long delays in your application.
Cancel flag to true. This is a race condition. For this ' example, it computes a Fibonacci number and ' reports progress as it does its work. Cancelled will ' not be set to true in your RunWorkerCompleted ' event handler. The BackgroundWorker and DoWorkEventArgs parameters will be used later for progress reporting and cancellation support.
This result will be available to the RunWorkerCompleted event handler. Note The DoWork event handler does not reference the backgroundWorker1 instance variable directly, as this would couple this event handler to a specific instance of BackgroundWorker.
Instead, a reference to the BackgroundWorker that raised this event is recovered from the sender parameter. This is important when the form hosts more than one BackgroundWorker. It is also important not to manipulate any user-interface objects in your DoWork event handler.
Instead, communicate to the user interface through the BackgroundWorker events. DoWork ' Get the BackgroundWorker object that raised this event. This is will be available to the ' RunWorkerCompleted eventhandler. Click ' Reset the text in the result label.
Empty ' Disable the UpDown control until ' the asynchronous operation is done. Value ' Reset the variable for percentage tracking. RunWorkerCompleted ' First, handle the case where an exception was thrown.The K&N FIPK Cold Air Intake will free up some horsepower on its own.
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Sang-ho Lee (silver) of Republic of Korea competes in the Men's Snowboard Parallel Giant Slalom on day 15 of the PyeongChang Winter Olympic Games at Phoenix Snow Park on February 24, in Pyeongchang-gun, Republic of Korea.
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A year old high school junior, Phoebe Cai is already engaged in research at a collegiate level, assisting in the data analysis of a research project at the University of Pennsylvania Medical.