- 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 "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 .
- 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
- 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 - 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[C#]private TwainSession twnSession; - 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); } } - 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 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); } - Build, and Run the program to test it.