Start Visual Studio .NET.

Choose File->New->Project… from the menu.

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.

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.

• Leadtools.dll
• Leadtools.Twain.dll
• Leadtools.Codecs.dll
• Leadtools.WinForms.dll

Go to the toolbox (View->Toolbox) and Drag and drop 3 instances of Button control to the top of the form and set the following properties for them:

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:

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

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

Declare the following private variable:

            Private WithEvents twnSession As TwainSession
            Private fastConfigResult As TwainFindFastConfigurationResult
            

            private TwainSession twnSession;
            private TwainFindFastConfigurationResult fastConfigResult;
            

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

            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.
                  Dim MY_LICENSE_FILE As String = "d:\temp\TestLic.lic"
                  Dim MY_DEVELOPER_KEY As String = "xyz123abc"
                  RasterSupport.SetLicense(MY_LICENSE_FILE, MY_DEVELOPER_KEY)
                  twnSession = new TwainSession
                  twnSession.Startup(Me.Handle, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None)
               Catch ex As Exception
                  MessageBox.Show(ex.Message)
               End Try
            End Sub   
            

            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.
                  string MY_LICENSE_FILE = "d:\\temp\\TestLic.lic";
                  string MY_DEVELOPER_KEY = "xyz123abc";
                  RasterSupport.SetLicense(MY_LICENSE_FILE, MY_DEVELOPER_KEY);
                  twnSession = new TwainSession();
                  twnSession.Startup(this.Handle, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);
               }
               catch (Exception ex)
               {
                  MessageBox.Show(this, ex.Message);
               }
            }
            

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

            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   
            

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

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

            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   
            

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

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

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

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

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

            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   
            

            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);
               }
            }
            

Build, and Run the program to test it.