Twain Feeder Tutorial # 2

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Take the following steps to start a project:
  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 "TwainFeeder2" 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 1 instance of Button control to the top of the form and set the following properties for them:
    Text Name
    Acquire buttonAcquire
  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
                
    
    [C#]
    
                private TwainSession twnSession;
                
    
  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.
                      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);
                   }
                }
                
    
  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 buttonAcquire Click event and code it as follows: [Visual Basic]
    
                Private Sub buttonAcquire_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonAcquire.Click
                   Dim twainCap As TwainCapability = New TwainCapability
                   
                   twnSession.SelectSource(String.Empty)
                   
                   Try
                      twainCap.Information.Type = TwainCapabilityType.FeederEnabled
                      twainCap.Information.ContainerType = TwainContainerType.OneValue
                      
                      Dim enable As Boolean = True
                      twainCap.OneValueCapability.ItemType = TwainItemType.Bool
                      twainCap.OneValueCapability.Value = enable
                      
                      twnSession.SetCapability(twainCap, TwainSetCapabilityMode.Set)
                      MessageBox.Show(Me, "CAP_FEEDERENABLED capability is enabled")
                      
                      ' check if there is document loaded in the feeder
                      twainCap = twnSession.GetCapability(TwainCapabilityType.FeederLoaded, TwainGetCapabilityMode.GetValues)
                      ' check if the selected driver supports duplex capability
                      enable = CType(twainCap.OneValueCapability.Value, Boolean)
                      If enable Then
                         MessageBox.Show(Me, "There is document loaded in the feeder")
                      Else
                         MessageBox.Show(Me, "There is no document loaded in the feeder")
                      End If
                   Catch ex As Exception
                      MessageBox.Show(Me, ex.Message)
                   End Try
                   
                   ' try to acquire pages using CAP_FEEDERENABLED and CAP_FEEDERLOADED capabilities
                   twnSession.Acquire(TwainUserInterfaceFlags.Show Or TwainUserInterfaceFlags.Modal)
                End Sub
                
    
    [C#]
    
                private void buttonAcquire_Click(object sender, System.EventArgs e)
                {
                   TwainCapability twainCap = new TwainCapability();
                   twnSession.SelectSource(string.Empty);
                   
                   try
                   {
                      twainCap.Information.Type = TwainCapabilityType.FeederEnabled;
                      twainCap.Information.ContainerType = TwainContainerType.OneValue;
                      
                      bool enable = true;
                      twainCap.OneValueCapability.ItemType = TwainItemType.Bool;
                      twainCap.OneValueCapability.Value = enable;
                      
                      twnSession.SetCapability(twainCap, TwainSetCapabilityMode.Set);
                      MessageBox.Show(this, "CAP_FEEDERENABLED capability is enabled");
                      
                      // check if there is document loaded in the feeder
                      twainCap = twnSession.GetCapability(TwainCapabilityType.FeederLoaded, TwainGetCapabilityMode.GetValues);
                      // check if the selected driver supports duplex capability
                      enable = (bool)twainCap.OneValueCapability.Value;
                      if (enable)
                         MessageBox.Show(this, "There is document loaded in the feeder");
                      else
                         MessageBox.Show(this, "There is no document loaded in the feeder");
                   }
                   catch (Exception ex)
                   {
                      MessageBox.Show(this, ex.Message);
                   }
                   
                   // try to acquire pages using CAP_FEEDERENABLED and CAP_FEEDERLOADED capabilities
                   twnSession.Acquire(TwainUserInterfaceFlags.Show | TwainUserInterfaceFlags.Modal);
                }
                
    
  12. Build, and Run the program to test it.

 

 


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