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 "\LEAD Technologies\LEADTOOLS 15\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 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

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.
      RasterSupport.Unlock(RasterSupportType.Document, "TestKey")

      twnSession = new TwainSession
      twnSession.Startup(Me, "LEAD Technologies, Inc.", "LEAD Twain .NET", "Version 14", "LEADTools Twain test sample", 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, "LEAD Technologies, Inc.", "LEAD Twain .NET", "Version 14", "LEADTools Twain test sample", 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:\Program Files\LEAD Technologies\LEADTOOLS 15\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:\Program Files\LEAD Technologies\LEADTOOLS 15\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:\Program Files\LEAD Technologies\LEADTOOLS 15\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:\Program Files\LEAD Technologies\LEADTOOLS 15\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.

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Get a Fast Twain Scan from a Scanner