wpf demo (gif , multithredading,httpwatch)

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Introduction

the demo with GIF animation ,multithreading,and use httpwatch to get the url of flv file

Background

c# wpf httpwatch

Points of Interest

Did you learn anything interesting/fun/annoying while writing the code? Did you do anything particularly clever or wild or zany?

History

Keep a running update of any changes or improvements you've made here.

the demo includes:

gif animation in wpf

multithreading in wpf

use httpwatch to get the url of flv file 

1.gif animation in wpf

the first problem is how to show gif aninamation in wpf ?

here I use a library called "GifImageLib". :) this is a prefect work! it works fine !

2.multithreading in wpf

the multithreading in wpf called "Dispatcher" . After I searched in msdn.I wrote the code for multithreading.

 

 BackgroundWorker _backgroundWorker=null;
        string flvUrl = string.Empty;
        string strUrl = string.Empty;
        public Window1()
        {
            InitializeComponent();
         }

        private delegate void DoWorkDelegate(int time);
        private void btnGet_Click(object sender, RoutedEventArgs e)
        {
            /**/////first try , gif stoped
            //imageLoad.Visibility = Visibility.Visible;
            //new Thread(() =>
            //{
            //    Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>
            //    {
            //        Thread.Sleep(5000);
            //        imageLoad.Visibility = Visibility.Hidden;
            //        tbWait.Visibility = Visibility.Hidden;

            //    }));
            //}).Start();
            _backgroundWorker = new BackgroundWorker();
            _backgroundWorker.DoWork+=new DoWorkEventHandler(DoWork);
            _backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(FinsihWork);
            BeforeWork();
            _backgroundWorker.RunWorkerAsync();
            _backgroundWorker.Dispose();
        }
        private void DoWork(object sender, DoWorkEventArgs e)
        {
            //fake the process
             for (int i = 0; i < 10; i ++)
            {
                Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>
                {
                    WorkProgress.Value = i*10;
                }));
                Thread.Sleep(100);
            }
            try
            {
                if(strUrl!=string.Empty)
                    parseUrl(strUrl);
            }
            catch
            {
                    flvUrl="error";
            }
        }
        private void BeforeWork()
        {
            imageLoad.Visibility = Visibility.Visible;
            WorkProgress.Visibility = Visibility.Visible;
            WorkProgress.Maximum = 100;
            WorkProgress.Minimum = 0;
            WorkProgress.Value = 0;
            btnGet.IsEnabled = false;
            strUrl = textBox1.Text;
        }

        private void FinsihWork(object sender,RunWorkerCompletedEventArgs e)
        {
            WorkProgress.Visibility = Visibility.Hidden;
            imageLoad.Visibility = Visibility.Hidden;
            btnGet.IsEnabled = true;
            if (flvUrl != "error")
                tbResult.Text = flvUrl;
        }

 

 this is BackgroundWorker demo.

 

   _backgroundWorker.DoWork+=new DoWorkEventHandler(DoWork);

you can coding your work which needed long time.

 

 _backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(FinsihWork);

 

you can coding which you needed after the long time task.

3.use httpwatch to get the url of flv file

you can get the free httpwatch version from httpwatch.com . and you only need add com preference(httpwatch) to project

the code I using c#

      private bool UrlExistsUsingHttpWebRequest(string url)
        {
            try
            {
                System.Net.WebRequest.Create(url);
                return true;
            }
            catch
            {
                return false;
            }
        }

        private void tbResult_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (flvUrl != "error") 
                System.Diagnostics.Process.Start(flvUrl);
        }

 

Ok,finished

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