ScanTutorials Take the following steps to start a project and to add some code to find the fastest configuration for your scanner using the LEADTOOLS Fast TWAIN feature:

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 "GetFastTwainScan" 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 Leadtools For .NET "<LEADTOOLS_INSTALLDIR>\Bin\DotNet\Win32 " folder and select the following DLLs:
   • Leadtools.dll
   • Leadtools.Twain.dll
   • Leadtools.Codecs.dll
   • Leadtools.WinForms.dll
   Click the Select button and then press the OK button to add the above DLLs to the application.
6. Go to the toolbox (View->Toolbox) and Drag and drop a 3 instance of Button control to the top of the form and set the following properties for them:

   Text	Name
   Select Source	buttonSelectSource
   Find Fast Config	buttonFindFastConfig
   Acquire Fast Config	buttonAcquireFastConfig

7. 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.Twain
                Imports Leadtools.Codecs
                Imports Leadtools.WinForms
                
   

   [C#]

    
                using Leadtools;
                using Leadtools.Twain;
                using Leadtools.Codecs;
                using Leadtools.WinForms;
                
   

8. Declare the following private variable:

   [Visual Basic]

    
                Private WithEvents twnSession As TwainSession
                Private fastConfigResult As TwainFindFastConfigurationResult
                
   

   [C#]

    
                private TwainSession twnSession;
                private TwainFindFastConfigurationResult fastConfigResult;
                
   

9. Add an event handler to the Form1 Load event and code it as follows:

   [Visual Basic]

                Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
                   Try
                      ' Unlock Document support.
                      ' Note that this is a sample key, which will not work in your toolkit.
                      RasterSupport.Unlock(RasterSupportType.Document, "TestKey")
               
                      twnSession = new TwainSession
                      twnSession.Startup(Me, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None)
                   Catch ex As Exception
                      MessageBox.Show(ex.Message)
                   End Try
                End Sub   
                
   

   [C#]

    
                private void Form1_Load(object sender, System.EventArgs e)
                {
                   try
                   {
                      // Unlock Document support.
                      // Note that this is a sample key, which will not work in your toolkit.
                      RasterSupport.Unlock(RasterSupportType.Document, "TestKey");
               
                      twnSession = new TwainSession();
                      twnSession.Startup(this, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);
                   }
                   catch (Exception ex)
                   {
                      MessageBox.Show(this, ex.Message);
                   }
                }
                
   

10. Add an event handler to the Form1 Closing event and code it as follows:

    [Visual Basic]

                 Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
                    Try
                       twnSession.Shutdown()
                    Catch ex As Exception
                       MessageBox.Show(ex.Message)
                    End Try
                 End Sub   
                 
    

    [C#]

                 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
                 {
                    try
                    {
                       twnSession.Shutdown();
                    }
                    catch (Exception ex)
                    {
                       MessageBox.Show(this, ex.Message);
                    }
                 }
                 
    

11. Add an event handler to the buttonSelectSource Click event and code it as follows:

    [Visual Basic]

     
                 Private Sub buttonSelectSource_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonSelectSource.Click
                    Try
                       twnSession.SelectSource(String.Empty)
                    Catch ex As Exception
                       MessageBox.Show(ex.Message)
                    End Try
                 End Sub   
                 
    

    [C#]

                 private void buttonSelectSource_Click(object sender, System.EventArgs e)
                 {
                    try
                    {
                      twnSession.SelectSource(string.Empty);
                    }
                    catch (Exception ex)
                    {
                       MessageBox.Show(this, ex.Message);
                    }
                 }
                 
    

12. Add an event handler to the buttonFindFastConfig Click event and code it as follows:

    [Visual Basic]

     
                 Private Sub buttonFindFastConfig_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonFindFastConfig.Click
                    Try
                       twnSession.EnableFastConfigurationEvent = False
                       fastConfigResult = twnSession.FindFastConfiguration("<LEADTOOLS_INSTALLDIR>\Images", TwainFastUserInterfaceFlags.Show Or TwainFastUserInterfaceFlags.UseThread, 8, 5, Nothing)
                    Catch ex As Exception
                       MessageBox.Show(ex.Message)
                    End Try
                 End Sub   
                 
    

    [C#]

                 private void buttonFindFastConfig_Click(object sender, System.EventArgs e)
                 {
                    try
                    {
                       twnSession.EnableFastConfigurationEvent = false;
                       fastConfigResult = twnSession.FindFastConfiguration(@"<LEADTOOLS_INSTALLDIR>\Images", TwainFastUserInterfaceFlags.Show | TwainFastUserInterfaceFlags.UseThread, 8, 5, null);
                    }
                    catch (Exception ex)
                    {
                       MessageBox.Show(this, ex.Message);
                    }
                 }
                 
    

13. Add an event handler to the buttonAcquireFastConfig Click event and code it as follows:

    [Visual Basic]

                 Private Sub buttonAcquireFastConfig_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonAcquireFastConfig.Click
                    Try
                       twnSession.EnableAcquireMultiPageEvent = False
                 
                       twnSession.AcquireFast("C:\Users\Public\Documents\LEADTOOLS Images\test", _
                                              TwainFastUserInterfaceFlags.Show, _
                                              fastConfigResult.Best.TransferMechanism, _
                                              fastConfigResult.Best.ImageFormat, _
                                              fastConfigResult.Best.BitsPerPixel, _
                                              True, _
                                              fastConfigResult.Best.BufferSize, _
                                              True)
                 
                    Catch ex As Exception
                       MessageBox.Show(ex.Message)
                    End Try
                 End Sub   
                 
    

    [C#]

                 private void buttonAcquireFastConfig_Click(object sender, System.EventArgs e)
                 {
                    try
                    {
                       twnSession.EnableAcquireMultiPageEvent = false;
                 
                       twnSession.AcquireFast(@"C:\Users\Public\Documents\LEADTOOLS Images\test",
                            TwainFastUserInterfaceFlags.Show,
                            fastConfigResult.Best.TransferMechanism,
                            fastConfigResult.Best.ImageFormat,
                            fastConfigResult.Best.BitsPerPixel,
                            true,
                            fastConfigResult.Best.BufferSize,
                            true);
                    }
                    catch (Exception ex)
                    {
                       MessageBox.Show(this, ex.Message);
                    }
                 }
                 
    

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

 

 

---

Products | Support | Contact Us | Copyright Notices

© 2006-2011 All Rights Reserved. LEAD Technologies, Inc.