Get Twain Capability

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Take the following steps to start a project and to add some code to get a Twain Capability:
  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 "GetTwainCapability" 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 4 instances of Button control to the top of the form and set the following properties for them:
    Text Name
    Select Source buttonSelectSource
    Use Capability buttonUseCapability
    Set Brightness buttonSetBrightness
    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, "LEAD Technologies, Inc.", "LEAD TWAIN .NET", "Version 16", "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.
                      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 System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.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 buttonUseCapability Click event and code it as follows: [Visual Basic]
    
                Private Sub buttonUseCapability_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonUseCapability.Click
                   Try
                      Dim twGetCapability As TwainCapability = twnSession.GetCapability(TwainCapabilityType.ImageTransferMechanism, TwainGetCapabilityMode.GetCurrent)
                      
                      If twGetCapability.Information.ContainerType = TwainContainerType.OneValue Then
                         Dim capValue As TwainCapabilityValue = twGetCapability.OneValueCapability.Value
                         
                         If capValue <> TwainCapabilityValue.TransferMechanismFile Then
                            Dim twSetCapability As TwainCapability
                            
                            twSetCapability = new TwainCapability
                            twSetCapability.Information.ContainerType = TwainContainerType.OneValue
                            twSetCapability.Information.Type = TwainCapabilityType.ImageTransferMechanism
                            
                            twSetCapability.OneValueCapability.ItemType = TwainItemType.Uint16
                            twSetCapability.OneValueCapability.Value = TwainCapabilityValue.TransferMechanismFile
                            
                            twnSession.SetCapability(twSetCapability, TwainSetCapabilityMode.Set)
                         End If
                      End If
                   Catch ex As Exception
                      MessageBox.Show(ex.Message)
                   End Try
                End Sub
                
    
    [C#]
    
                 
                private void buttonUseCapability_Click(object sender, System.EventArgs e)
                {
                   try
                   {
                      TwainCapability twGetCapability = twnSession.GetCapability(TwainCapabilityType.ImageTransferMechanism, TwainGetCapabilityMode.GetCurrent);
                      
                      if (twGetCapability.Information.ContainerType == TwainContainerType.OneValue)
                      {
                         TwainCapabilityValue capValue = (TwainCapabilityValue)twGetCapability.OneValueCapability.Value;
                         
                         if (capValue != TwainCapabilityValue.TransferMechanismFile)
                         {
                            TwainCapability twSetCapability;
                            
                            twSetCapability = new TwainCapability();
                            twSetCapability.Information.ContainerType = TwainContainerType.OneValue;
                            twSetCapability.Information.Type = TwainCapabilityType.ImageTransferMechanism;
                            
                            twSetCapability.OneValueCapability.ItemType = TwainItemType.Uint16;
                            twSetCapability.OneValueCapability.Value = TwainCapabilityValue.TransferMechanismFile;
                            
                            twnSession.SetCapability(twSetCapability, TwainSetCapabilityMode.Set);
                         }
                      }
                   }
                   catch (Exception ex)
                   {
                      MessageBox.Show(this, ex.Message);
                   }
                }
                
    
  13. Add an event handler to the buttonSetBrightness Click event and code it as follows: [Visual Basic]
    
                 
                Private Sub buttonSetBrightness_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonSetBrightness.Click
                   Try
                      Dim twCapability As TwainCapability = new TwainCapability
                      
                      twCapability.Information.ContainerType = TwainContainerType.OneValue
                      twCapability.Information.Type = TwainCapabilityType.ImageBrightness
                      
                      Dim brightnessValue As Integer = 50
                      twCapability.OneValueCapability.ItemType = TwainItemType.Fix32
                      twCapability.OneValueCapability.Value = brightnessValue
                      
                      twnSession.SetCapability(twCapability, TwainSetCapabilityMode.Set)
                   Catch ex As Exception
                      MessageBox.Show(ex.Message)
                   End Try
                End Sub
                
    
    [C#]
    
                 
                private void buttonSetBrightness_Click(object sender, System.EventArgs e)
                {
                   try
                   {
                      TwainCapability twCapability = new TwainCapability();
                      
                      twCapability.Information.ContainerType = TwainContainerType.OneValue;
                      twCapability.Information.Type = TwainCapabilityType.ImageBrightness;
                      
                      float brightnessValue = 50;
                      twCapability.OneValueCapability.ItemType = TwainItemType.Fix32;
                      twCapability.OneValueCapability.Value = brightnessValue;
                      
                      twnSession.SetCapability(twCapability, TwainSetCapabilityMode.Set);
                   }
                   catch (Exception ex)
                   {
                      MessageBox.Show(this, ex.Message);
                   }
                }
                
    
  14. 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
                   Try
                      Dim twnPros As TwainProperties = twnSession.Properties
                      Dim dataTransfer As TwainDataTransferProperties = twnPros.DataTransfer
                      dataTransfer.FileName = "C:\Users\Public\Documents\LEADTOOLS Images\Twain.bmp"
                      twnPros.DataTransfer = dataTransfer
                      twnSession.Properties = twnPros
                      twnSession.Acquire(TwainUserInterfaceFlags.Show)
                   Catch ex As Exception
                      MessageBox.Show(ex.Message)
                   End Try
                End Sub
                
    
    [C#]
    
                 
                private void buttonAcquire_Click(object sender, System.EventArgs e)
                {
                   try
                   {
                      TwainProperties twnPros = twnSession.Properties;
                      TwainDataTransferProperties dataTransfer = twnPros.DataTransfer;
                      dataTransfer.FileName = @"C:\Users\Public\Documents\LEADTOOLS Images\Twain.bmp";
                      twnPros.DataTransfer = dataTransfer;
                      twnSession.Properties = twnPros;
                      twnSession.Acquire(TwainUserInterfaceFlags.Show);
                   }
                   catch (Exception ex)
                   {
                      MessageBox.Show(ex.Message);
                   }
                }
                
    
  15. Build, and Run the program to test it.

 

 


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