- 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 "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 .
- 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
- Go to the toolbox (View->Toolbox) and Drag and drop a 4 instance 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 - 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, "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. 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 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); } } - 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 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); } } - 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); } } - 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); } } - Build, and Run the program to test it.