C#
// Create SMTP object
Smtp mailer = new Smtp();

// Set the message fields.
mailer.From.AsString = "jdoe@domain.com";
mailer.To.AsString = "bill@domain2.com";
mailer.Subject = "Hi";
mailer.BodyPlainText = "This is test message";

// Starts logging SMTP activities into a file. 
mailer.Log.Enabled = true;
mailer.Log.Filename = @"C:\log.txt";
mailer.Log.Clear();

// Specify the server to use. If your server does not require authentication, 
// just omit both last parameters.
mailer.SmtpServers.Add("mail.domain.com", "jdoe", "secret");

// Attempt to connect.
mailer.Connect();

// Display the host name of the server the connection was established with.
Console.WriteLine("Connected to " + mailer.SmtpServers[mailer.GetCurrentSmtpServerIndex()].Name);

// Make sure all the recipients are ok.
if (mailer.TestSend(SendFailureThreshold.AllRecipientsFailed) != TestSendResult.OK)
{
        Console.WriteLine("No recipients can receive the message.");
}// Show refused recipients if any
else if (mailer.GetRefusedRecipients().Count > 0)
{
    Console.WriteLine("The following recipients failed: " + mailer.GetRefusedRecipients().ToString());
}
else
{
    Console.WriteLine("All recipients are ok. Will send the message now.");

    // Send e-mail. If it cannot be delivered, bounce will
    // arrive to bounce@domain3.com, not to joe@domain1.com
    mailer.Send("bounce@domain.com", (string)null);
    Console.WriteLine("Sent to: " + mailer.GetAcceptedRecipients().ToString());
}

// Disconnect from the server
mailer.Disconnect();

VB.NET
' Create SMTP object
Dim mailer As New Smtp

' Set the message fields.
mailer.From.AsString = "jdoe@domain.com"
mailer.To.AsString = "bill@domain2.com"
mailer.Subject = "Hi"
mailer.BodyPlainText = "This is test message"

' Starts logging SMTP activities into a file. 
mailer.Log.Enabled = True
mailer.Log.Filename = "C:\log.txt"
mailer.Log.Clear()

' Specify the server to use. If your server does not require authentication, 
' just remove last 2 parameters.
mailer.SmtpServers.Add("mail.domain.com", "jdoe", "secret")

' Attempt to connect.
mailer.Connect()

' Display the host name of the server the connection was established with.
Console.WriteLine("Connected to " + mailer.SmtpServers(mailer.GetCurrentSmtpServerIndex()).Name)

' Make sure all the recipients are ok.
If mailer.TestSend(SendFailureThreshold.AllRecipientsFailed) <> TestSendResult.OK Then
        Console.WriteLine("No recipients can receive the message.")
Else
    ' Show refused recipients if any
    If mailer.GetRefusedRecipients().Count > 0 Then
        Console.WriteLine("The following recipients failed: " & mailer.GetRefusedRecipients().ToString())
    Else
        Console.WriteLine("All recipients are ok. Will send the message now.")

        ' Send e-mail. If it cannot be delivered, bounce will
        ' arrive to bounce@domain3.com, not to joe@domain1.com
        mailer.Send("bounce@domain.com", CType(Nothing, String))
        Console.WriteLine("Sent to: " + mailer.GetAcceptedRecipients().ToString())
    End If
End If

' Disconnect from the server
mailer.Disconnect()

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1. Dynamic Web TWAIN可以使用哪些操作系统？

• IE 6-9：ActiveX
• IE 10-11：HTML5/ActiveX
• Edge：HTML5
• Chrome/Firefox 26-：NPAPI Plug-in (obsolete)
• Chrome/Firefox 27+：HTML5

• Chrome/Firefox 26-、Safari 6-：NPAPI Plug-in (obsolete)
• Chrome/Firefox 27+、Safari 7+：HTML5

2. Dynamic Web TWAIN是否支持Chrome或FireFox？

3. Dynamic Web TWAIN是否支持数据库？

4. Dynamic Web TWAIN是否支持SSL？

5.我可以使用FTP进行密码上传和下载吗？

6. Dynamic Web TWAIN是否能够在类库（DLL）项目中运行？

7. Dynamic Web TWAIN是否支持条形码阅读器或OCR？

8.我可以扫描大量的文件吗？

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1.如何获取黑白图像？

DWObject.OpenSource();
DWObject.IfShowUI = false;
DWObject.IfDisableSourceAfterAcquire = true;
DWObject.PixelType = EnumDWT_PixelType.TWPT_BW; //Black - White 
image : EnumDWT_PixelType.TWPT_BW, GRAY image: 
EnumDWT_PixelType.TWPT_GRAY, RGB 
image: EnumDWT_PixelType.TWPT_RGB
DWObject.AcquireImage();

2.如何在没有用户界面的情况下运行？

function BeginScan(){
    DWObject.OpenSource();
    DWObject.IfShowUI = false; //set without user interface
    DWObject.IfDisableSourceAfterAcquire = true;

    DWObject.AcquireImage();
}

function DWObject_OnPostTransfer(){
    DWObject.SaveAsBMP("C:\\temp.bmp",0);
}

3.如何只扫描纸张的某一部分？

DWObject.SelectSource();
DWObject.OpenSource();
DWObject.IfShowUI = false;
//Set Image Layout
DWObject.Unit = EnumDWT_UnitType.TWUN_INCHES;
DWObject.SetImageLayout(0, 0, 5, 5);
DWObject.AcquireImage(); 

4.如何在不显示设备选择对话框的情况下选择设备？

DWObject.OpenSourceManager();

for(i = 0, i<=DWObject.SourceCount - 1,i++){
    if (DWObject.GetSourceNameItems(i) == "Specified device name")
        DWObject.SelectSourceByIndex (i);
}

//if can't find the specified source, it'll select default source
DWObject.AcquireImage(); 

5.如何在不使用UI获取图像时禁用进度指示器对话框？

DWObject.IfShowUI = false;
DWObject.IfDisableSourceAfterAcquire = true;
DWObject.OpenSource();
DWObject.IfShowIndicator = false;
DWObject.AcquireImage();

6.如何分别设置水平和垂直分辨率？

DWObject.SelectSource();
DWObject.OpenSource();

//Set XRESOLUTION current value.
DWObject.Capability = 0x1118; //ICAP_XRESOLUTION
DWObject.CapType = 5; //TWON_ONEVALUE
DWObject.CapValue = 300;
if (DWObject.CapSet == false){
    alert( "Failed to set the x-resolution. " + DWObject.ErrorString);
}

//Set YRESOLUTION current value.
DWObject.Capability = 0x1119; //ICAP_YRESOLUTION
DWObject.CapType = 5; //TWON_ONEVALUE
DWObject.CapValue = 200;
if (DWObject.CapSet == false){
   alert( "Failed to set the y-resolution." + DWObject.ErrorString);
}

DWObject.AcquireImage();

7.如何上传到Web服务器？

DWObject = document.getElementById("dwtcontrolContainer");
//dwtcontrolContainer is the id of the Dynamic Web TWAIN on the page (An object or an embed).
function btnScan_onclick() 
{
DWObject.SelectSource();
DWObject.OpenSource();
DWObject.AcquireImage();
}
function btnUpload_onclick() 
{
var strActionPage;
var strHostIP;
var CurrentPathName = unescape(location.pathname); // get current PathName in 
plain ASCII 
var CurrentPath = CurrentPathName.substring(0, CurrentPathName.lastIndexOf("/") 
+ 1); 
strActionPage = CurrentPath + "SaveToFile.aspx"; //the ActionPage's file path
strHostIP = "localhost"; //The host's IP or name 
DWObject.HTTPPort = 80; 
DWObject.HTTPUploadThroughPost(strHostIP,0,strActionPage,"imageData.tif");
if (DWObject.ErrorCode != 0)
alert(DWObject.ErrorString);
else //succeed
alert("Image Uploaded successfully");
}

8.如何使用ADF？希望将每个文档保存在一个单独的文件中。

var iDocumentCounter =0;

function BeginScan(){
    DWObject.OpenSource();

    DWObject.IfShowUI = false;
    DWObject.IfDisableSourceAfterAcquire = true;
    if(DWObject.Duplex != TWDX_NONE)
        DWObject.IfDuplexEnabled = true; //enable duplex

DWObject.IfFeederEnabled = true;
    if (DWObject.IfFeederEnabled == true){
         DWObject.XferCount = -1;

         if(DWObject.IfFeederLoaded == True)
             DWObject.AcquireImage();
    }
}

function DWObject_OnPosttransfer(){
iDocumentCounter = iDocumentCounter + 1;

if(DWObject.SaveAsBMP("C:\\Image\\" + iDocumentCounter + ".bmp", 0) == false)
    alert( DWObject.ErrorString);
}

9.我如何使用SSL？

function btnUpload_onclick() 
{
   DWObject.HTTPPort = 80; 
   DWObject.IfSSL = false; // if 80 is the port number of 
non-secure port

   /* 
   DWObject.HTTPPort = 443; 
   DWObject.IfSSL = true; // if 443 is the port number of secure 
port
   */

   DWObject.HTTPUploadThroughPost("127.0.0.1", 0, 
"/SaveToFile.php", "imageData.jpg");

   if (DWObject.ErrorCode != 0)
      alert(DWObject.ErrorString);
   else //succeed
     alert("Successful");
}

10.如何将新扫描的图像添加到现有的多页TIFF文件中？

function Scan_Click(){
   DWObject.AcquireImage();
}
function DWObject_OnPostTransfer(){
   DWObject.CloseSource();
   DWObject.IfTiffMultiPage = true;
   DWObject.SaveAsTIFF("SaveAsTIFF.tif", 0);
   if (DWObject.ErrorCode != 0)
      alert (DWObject.ErrorString);
   else //succeed
      alert ("Successful");
}

11.如何在保存之前旋转图像？

12.如果缓冲区中有多个图像，如何查看指定的图像？

function NextImage_Click(){
   if (DWObject.HowManyImagesInBuffer == 0) 
   
      alert ("There is no image in buffer");

   DWObject.CurrentImageIndexInBuffer += 1;
}

13.如何进行双面扫描？
function DuplexScan_Click(){
   DWObject.SelectSource();
   DWObject.OpenSource();
   DWObject.IfShowUI = false;
   DWObject.IfDuplexEnabled = true; //enable duplex
   DWObject.AcquireImage();
} 

14.如何以反转颜色扫描图像？

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