Take the following steps to start a project and to add some code to obtain 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 click 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 "\LEAD Technologies\LEADTOOLS xx\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 click 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 the 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. 
                     RasterSupport.Unlock(RasterSupportType.Document, "TestKey") 
                     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. 
                     RasterSupport.Unlock(RasterSupportType.Document, "TestKey"); 
                     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 brightneesValue As Integer = 50 
                      twCapability.OneValueCapability.ItemType = TwainItemType.Fix32 
                      twCapability.OneValueCapability.Value = brightneesValue 
                      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 brightneesValue = 50; 
                      twCapability.OneValueCapability.ItemType = TwainItemType.Fix32; 
                      twCapability.OneValueCapability.Value = brightneesValue; 
                      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 = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) & "//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 = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "//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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