Get a Fast Twain Scan from a Scanner

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:

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 .
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.

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:

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

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;

Declare the following private variable: [Visual Basic]


             
            Private WithEvents twnSession As TwainSession
            Private fastConfigResult As TwainFindFastConfigurationResult

[C#]


             
            private TwainSession twnSession;
            private TwainFindFastConfigurationResult fastConfigResult;

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.
                  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, "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.
                  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, "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: [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);
               }
            }

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);
               }
            }

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("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

[C#]


            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: [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);
               }
            }

Build, and Run the program to test it.