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根据以下步骤，您可以创建一个简单的LeadTools应用程序，它可以从TWAIN源获取图像：

1. 打开Visual Studio .NET。

2. 点击 文件->新建->项目…。

3. 打开新建项目对话框后，在模板中选择"Visual C#"或"Visual Basic"，随后选择"Windows窗体应用程序"。在名称栏中输入项目名称"Acquiring an Image"，并使用"浏览"按钮选择您工程的存储路径，点击"确定"。

4. 在"解决方案资源管理器"中，右击"引用"，选择"添加引用"。在"引用管理器"中，浏览选择Leadtools For .NET文件夹" <LEADTOOLS_INSTALLDIR>\Bin\DotNet\Win32",选择以下的DLL：

• Leadtools.dll
• Leadtools.Twain.dll
• Leadtools.Codecs.dll
• Leadtools.WinForms.dll

点击"确定"按钮，将以上所有的DLL添加到应用程序中。

5. 将Form1调整到设计视图，在工具箱（视图->工具箱）拖拽一个RasterImageViewer实例至窗体。若您的工具箱没有RasterImageViewer，点击工具->选择工具箱项…。点击浏览从"<LEADTOOLS_INSTALLDIR>\Bin\DotNet\Win32"中选择Leadtools.WinForms.DLL，点击打开并确定。

6. 切换至Form1的设计视图，从工具箱（视图->工具箱）里拖拽3个RadioButton控件的实例至窗体上，根据以下表格修改属性：

7. 从工具箱（视图->工具箱）拖拽4个Button控件的实例至窗体上，根据以下表格修改相关属性：

8. 切换至Form1的代码视图，在文件开始添加以下代码：

1: [C#] 
  2:    using Leadtools;
  3:    using Leadtools.Twain;
  4:    using Leadtools.Codecs;
  5:    using Leadtools.WinForms;

9. 声明以下私有变量：

1: [C#] 
  2:    private TwainSession twnSession;

10. 为Form1的Load事件添加事件句柄，并添加以下代码：

1: [C#] 
  2: 
  3: private void Form1_Load(object sender, System.EventArgs e)
  4: {
  5:    try
  6:    {
  7:       twnSession = new TwainSession();
  8:       twnSession.Startup(this, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);
  9:    }
 10:    catch (Exception ex)
 11:    {
 12:       MessageBox.Show(this, ex.Message);
 13:    }
 14: }

11. 为Form1的Closing事件添加事件句柄，代码如下：

1: [C#] 
  2: private void Form1_FormClosing(object sender, FormClosingEventArgs e)
  3: {
  4:    try
  5:    {
  6:       twnSession.Shutdown();
  7:    }
  8:    catch (Exception ex)
  9:    {
 10:       MessageBox.Show(this, ex.Message);
 11:    }
 12: }

12. 为twnSession AcquirePage事件添加事件句柄，并添加以下代码：

1: [C#] 
  2: 
  3: private void twnSession_AcquirePage(object sender, TwainAcquirePageEventArgs e)
  4: {
  5:    rasterImageViewer1.Image = e.Image;
  6: }

13. 为buttonAcquire Click 事件添加事件句柄，并添加以下代码：

1: [C#] 
  2: 
  3: private void buttonAcquire_Click(object sender, System.EventArgs e)
  4: {
  5:    try
  6:    {
  7:       twnSession.AcquirePage += new EventHandler<TwainAcquirePageEventArgs>(twnSession_AcquirePage);
  8:       twnSession.Acquire(TwainUserInterfaceFlags.Show);
  9:    }
 10:    catch (Exception ex)
 11:    {
 12:       MessageBox.Show(this, ex.Message);
 13:    }
 14: }

14. 为buttonSelectSource Click事件添加事件句柄，并添加以下代码：

1: [C#] 
  2: 
  3: private void buttonSelectSource_Click(object sender, System.EventArgs e)
  4: {
  5:    try
  6:    {
  7:       twnSession.SelectSource(string.Empty);
  8:    }
  9:    catch (Exception ex)
 10:    {
 11:       MessageBox.Show(this, ex.Message);
 12:    }
 13: }

15. 为buttonSaveTemplateFile Click事件添加事件句柄，并添加以下代码：

1: [C#] 
  2: 
  3: private void buttonSaveTemplateFile_Click(object sender, System.EventArgs e)
  4: {
  5:    try
  6:    {
  7:       twnSession.SaveTemplateFile(@"c:\test.ltt");
  8:    }
  9:    catch (Exception ex)
 10:    {
 11:       MessageBox.Show(this, ex.Message);
 12:    }
 13: }

16. 为buttonLoadTemplateFile Click事件添加事件句柄，并添加以下代码：

1: [C#] 
  2: 
  3: private void buttonLoadTemplateFile_Click(object sender, System.EventArgs e)
  4: {
  5:    try
  6:    {
  7:       twnSession.LoadTemplateFile(@"c:\test.ltt");
  8:    }
  9:    catch (Exception ex)
 10:    {
 11:       MessageBox.Show(this, ex.Message);
 12:    }
 13: }

17. 为radioNative CheckedChanged事件添加事件句柄，并添加以下代码：

1: [C#] 
  2: 
  3: private void radioNative_CheckedChanged(object sender, System.EventArgs e)
  4: {
  5:    try
  6:    {
  7:       TwainCapability capability = new TwainCapability();
  8:       capability.Information.ContainerType = TwainContainerType.OneValue;
  9:       capability.Information.Type = TwainCapabilityType.ImageTransferMechanism;
 10:       capability.OneValueCapability.ItemType = TwainItemType.Uint16;
 11:       capability.OneValueCapability.Value = (UInt16)TwainTransferMechanism.Native;
 12:       twnSession.SetCapability(capability, TwainSetCapabilityMode.Set);
 13:    }
 14:    catch (Exception ex)
 15:    {
 16:       MessageBox.Show(this, ex.Message);
 17:    }
 18: }

18. 为radioMemory CheckedChanged事件添加事件句柄，代码如下：

1: [C#] 
  2: 
  3: private void radioMemory_CheckedChanged(object sender, System.EventArgs e)
  4: {
  5:    try
  6:    {
  7:       TwainCapability capability = new TwainCapability();
  8:       capability.Information.ContainerType = TwainContainerType.OneValue;
  9:       capability.Information.Type = TwainCapabilityType.ImageTransferMechanism;
 10:       capability.OneValueCapability.ItemType = TwainItemType.Uint16;
 11:       capability.OneValueCapability.Value = (UInt16)TwainTransferMechanism.Memory;
 12:       twnSession.SetCapability(capability, TwainSetCapabilityMode.Set);
 13:    }
 14:    catch (Exception ex)
 15:    {
 16:       MessageBox.Show(this, ex.Message);
 17:    }
 18: }

19. 为radioFile CheckedChanged事件添加事件句柄，代码如下：

1: [C#] 
  2: 
  3: private void radioFile_CheckedChanged(object sender, System.EventArgs e)
  4: {
  5:    try
  6:    {
  7:       TwainCapability capability = new TwainCapability();
  8:       capability.Information.ContainerType = TwainContainerType.OneValue;
  9:       capability.Information.Type = TwainCapabilityType.ImageTransferMechanism;
 10:       capability.OneValueCapability.ItemType = TwainItemType.Uint16;
 11:       capability.OneValueCapability.Value = (UInt16)TwainTransferMechanism.File;
 12:       twnSession.SetCapability(capability, TwainSetCapabilityMode.Set);
 13:    }
 14:    catch (Exception ex)
 15:    {
 16:       MessageBox.Show(this, ex.Message);
 17:    }
 18: }

20. 编译并运行程序。

转载来自//blog.gcpowertools.com.cn/post/2014/09/09/acquire-an-image-by-leadtools.aspx