Take the following steps to start a project and to add some code that acquires the images using Fast Twain:
- 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 "UsingFastTwainFeature" 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
Click the Select button and then press the OK button to add the above DLLs to the application.
- Go to the toolbox (View->Toolbox) and Drag and drop 2 instances of RadioButton control to the top of the form and set the following properties for them:
| Text |
Name |
Checked |
| Native |
radioNative |
False |
| Memory |
radioMemory |
False |
- 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 |
| Fast Acquire |
buttonFastAcquire |
- Go to the toolbox (View->Toolbox) and Drag and drop an instance of Check Box control to the top of the form and set the following properties for them:
| Name |
Name |
| Use Buffer Size |
checkBoxUseBufferSize |
- Go to the toolbox (View->Toolbox) and Drag and drop 2 instances of Text Box control to the top of the form and change the following properties:
| Property |
Value |
| Name |
textBufferSize |
| Name |
textFileName |
- 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
textFileName.Text = "c:\twain_test.tif"
textBufferSize.Text = "2048"
Try
' Unlock Document support.
' Note that this is a sample key, which will not work in your toolkit.
RasterSupport.SetLicense(RasterSupportType.Document, "TestKey")
twnSession = new TwainSession
twnSession.Startup(Me, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.InitializeMultithreaded)
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
[C#]
private void Form1_Load(object sender, System.EventArgs e)
{
textFileName.Text = @"c:\twain_test.tif";
textBufferSize.Text = "2048";
try
{
// Unlock Document support.
// Note that this is a sample key, which will not work in your toolkit.
RasterSupport.SetLicense(RasterSupportType.Document, "TestKey");
twnSession = new TwainSession();
twnSession.Startup(this, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.InitializeMultithreaded);
}
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 buttonFastAcquire Click event and code it as follows:
[Visual Basic]
Private Sub buttonFastAcquire_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonFastAcquire.Click
Dim transferMode As TwainTransferMode
Dim transferFormat As RasterImageFormat
If radioMemory.Checked Then
transferMode = TwainTransferMode.Buffer
transferFormat = RasterImageFormat.CcittGroup4
Else
transferMode = TwainTransferMode.Native
transferFormat = RasterImageFormat.Tif
End If
Try
twnSession.AcquireFast(textFileName.Text, _
TwainFastUserInterfaceFlags.Show Or TwainFastUserInterfaceFlags.UseThread, _
transferMode, _
transferFormat, _
1, _
True, _
Convert.ToInt32(textBufferSize.Text), _
checkBoxUseBufferSize.Checked)
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
[C#]
private void buttonFastAcquire_Click(object sender, System.EventArgs e)
{
TwainTransferMode transferMode;
RasterImageFormat transferFormat;
if (radioMemory.Checked)
{
transferMode = TwainTransferMode.Buffer;
transferFormat = RasterImageFormat.CcittGroup4;
}
else
{
transferMode = TwainTransferMode.Native;
transferFormat = RasterImageFormat.Tif;
}
try
{
twnSession.AcquireFast(textFileName.Text,
TwainFastUserInterfaceFlags.Show | TwainFastUserInterfaceFlags.UseThread,
transferMode,
transferFormat,
1,
true,
Convert.ToInt32(textBufferSize.Text),
checkBoxUseBufferSize.Checked);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
- Build, and Run the program to test it.
