Take the following steps to start a project and to add some code that updates a gauge during processing and detects a user interrupt:

1. Start Visual Studio .NET.
2. Choose File->New->Project… from the menu.
3. In the New Project dialog box, choose either "Visual C# Projects" or "Visual Basic Projects" in the Projects Type List, and choose "Windows Application " in the Templates List.
4. Type the project name as "Updating a Guage and Detecting User Interrupt" in the Project Name field, and then choose OK. If desired, type a new location for your project or select a directory using the Browse button, and then choose OK .
5. In the "Solution Explorer" window, right-click on the "References" folder, and select "Add Reference…" from the context menu. In the "Add Reference" dialog box, select the ".NET" tab and browse to the "<LEADTOOLS_INSTALLDIR>\Bin\DotNet\Win32 " folder and select the following DLLs:
   • Leadtools.dll
   • Leadtools.Codecs.dll
   • Leadtools.Codecs.Cmp.dll
   • Leadtools.WinForms.dll
   • Leadtools.ImageProcessing.Core.dll
   Click the Select button and then press the OK button to add the above DLLs to the application.
6. Make sure Form1 is in design view. Go to the toolbox (View->Toolbox) and Drag and drop an instance of RasterImageViewer to the form. If you do not have RasterImageViewer in your toolbox, select Tools->Add Remove Toolbox Items from the menu. Click Browse, select Leadtools.WinForms.DLL from the "\LEAD Technologies\LEADTOOLS 17\Bin\DotNet\Win32" folder, click Open, and then click OK.
7. From the toolbox (View->Toolbox), add a ProgressBar, a Button (Text = "Median") and and another Button (Text = "Cancel").
8. Switch to Form1 code view (right-click Form1 in the solution explorer then select View Code ) and add the following lines at the beginning of the file:

   [Visual Basic]

               Imports Leadtools
               Imports Leadtools.Codecs
               Imports Leadtools.WinForms
               Imports Leadtools.ImageProcessing
               Imports Leadtools.ImageProcessing.Core
               
   

   [C#]

                
               using Leadtools;
               using Leadtools.Codecs;
               using Leadtools.WinForms;
               using Leadtools.ImageProcessing;
               using Leadtools.ImageProcessing.Core;
               
   

9. Add an event handler to the Form1 Load event and add the following code:

   [Visual Basic]

               Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
                  ' load an image into our viewer
                  Dim codecs As New RasterCodecs()
                  rasterImageViewer1.Image = codecs.Load("C:\Users\Public\Documents\LEADTOOLS Images\Image3.cmp")
                  
                  ' disable the cancel button for now
                  Button2.Enabled = False
               End Sub
               
   

   [C#]

               private void Form1_Load(object sender, System.EventArgs e)
               {
                  // load an image into our viewer
                  RasterCodecs codecs = new RasterCodecs();
                  rasterImageViewer1.Image = codecs.Load(@"C:\Users\Public\Documents\LEADTOOLS Images\Image3.cmp");
                  
                  // disable the cancel button for now
                  button2.Enabled = false;
               }
               
   

10. Double-click the "median" button on the form to add the event handler for it and add the following code:

    [Visual Basic]

                Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
                   canceled = False
                   ProgressBar1.Value = 0
                   
                   ' disable the median button and enable the cancel button
                   Button1.Enabled = False
                   Button2.Enabled = True
                   
                   Dim command As New MedianCommand(40)
                   
                   ' subscribe to the progress event
                   AddHandler command.Progress, AddressOf median_Progress
                   
                   ' run the median command
                   command.Run(RasterImageViewer1.Image)
                   
                   ' enable the median button and disable the cancel button
                   Button1.Enabled = True
                   Button2.Enabled = False
                   ProgressBar1.Value = 0
                End Sub
                
    

    [C#]

                private void button1_Click(object sender, System.EventArgs e)
                {
                   canceled = false;
                   progressBar1.Value = 0;
                   
                   // disable the median button and enable the cancel button
                   button1.Enabled = false;
                   button2.Enabled = true;
                   
                   MedianCommand command = new MedianCommand(40);
                   
                   // subscribe to the progress event
                   command.Progress += new EventHandler<RasterCommandProgressEventArgs>(median_Progress);
                   
                   // run the median command
                   command.Run(rasterImageViewer1.Image);
                   
                   // enable the median button and disable the cancel button
                   button1.Enabled = true;
                   button2.Enabled = false;
                   progressBar1.Value = 0;
                }
                   
                
    

11. Double-click the "cancel" button on the form to add the event handler for it and add the following code: [Visual Basic]

                Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
                   ' Cancel the median command
                   canceled = True
                End Sub
                
    

    [C#]

                private void button2_Click(object sender, System.EventArgs e)
                {
                   // Cancel the median command
                   canceled = true;
                }
                
    

12. Add the below code to the Form1 class: [Visual Basic]

                Private canceled As Boolean
                Private Sub median_Progress(ByVal sender As System.Object, ByVal e As RasterCommandProgressEventArgs)
                   ' update the value of the progress bar
                   ProgressBar1.Value = e.Percent
                   
                   ' determine whether the cancel button has been pressed
                   If (canceled) Then
                      e.Cancel = True
                   End If
                   
                   Application.DoEvents()
                End Sub
                
    

    [C#]

                private bool canceled;
                private void median_Progress(object sender, RasterCommandProgressEventArgs e)
                {
                   // update the value of the progress bar
                   progressBar1.Value = e.Percent;
                   
                   // determine whether the cancel button has been pressed
                   if(canceled)
                      e.Cancel = true;
                   
                   Application.DoEvents();
                }
                
    

13. Build, and Run the program to test it.

 

 

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