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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// Create POP3 object
Pop3 pop = new Pop3();

// Enable logging to file
pop.Log.Enabled = true;
pop.Log.Filename = @"C:\log.txt";
pop.Log.Clear();

// Connect to POP3 server
pop.Connect("mail.domain.com");
pop.Login("bounce", "secret");

// Download headers and bodies of all messages.
MailMessageCollection msgs = pop.DownloadMessageHeaders(1, -1, -1);
                        
// Loop through all messages in the mailbox
foreach (MailMessage msg in msgs)
{
        string strLine = msg.BodyPlainText;
        Console.WriteLine("From: " + msg.From.Email);
                                
        // Get failed email address
        string str_invalid_email =  GetInvalidEmailAddressME(msg);

        // If str_invalid_email is non-empty then failed email 
        // address was found
        if (str_invalid_email.Length > 0)
        {
                // Remove failed email from database
                RemoveEmailFromDatabase(str_invalid_email);

                // Display invalid adress
                Console.WriteLine("Invalid email: " + str_invalid_email);                

                // Delete bounced email from server to avoid
                // processing it next time
                pop.DeleteMessage(msg.IndexOnServer);
        }
}

// Disconnect from POP3 server
pop.Disconnect();

// The function checks whether the message is bounced and extracts 
// failed address 
// from bounced message. Valid only for MailEnable servers
static string  GetInvalidEmailAddressME(MailMessage msg)
{
        string str_invalid_email = msg.BodyPlainText;

        // Check if this is a bounced message report
        if (msg.Subject.IndexOf("Delivery Failure") == -1)
{ 
                return "";
        }
        if (msg.From.ToString().IndexOf("POSTMASTER") == -1)
        {
                return "";
        }

        // Now we're sure this is a bounced message report
        int i_start;
        i_start = str_invalid_email.IndexOf("SMTP:");

        // Check if bounced message report contains "Recipient:" field
        if (i_start == -1)
        {
                return "";
        }
                        
        // Get failed address
        i_start += 5;
        i_end = str_invalid_email.IndexOf("]",i_start);
        str_invalid_email.Substring(i_start, i_end);
                        
        return str_invalid_email;
}

// The function checks whether the message is bounced and extracts 
// failed address 
// from bounced message. Valid only for Communigate Pro servers
static string  GetInvalidEmailAddressCP(MailMessage msg)
{
string str_invalid_email = msg.BodyPlainText;

        // Check if this is a bounced message report
        if (msg.Subject.IndexOf("Undeliverable mail") == -1) 
        {
                return "";
        }
        if (msg.From.ToString().IndexOf("MAILER-DAEMON") == -1) 
        {
                return "";
        }

        // Now we're sure this is a bounced message report
        int i_start;
        i_start = str_invalid_email.IndexOf("to '<");

        // Check if bounced message report contains 
        // "Failed to deliver to " field
        if (i_start == -1)
        { 
                return "";
        }
                        
        // Get failed address
        i_start += 5;
        i_end = str_invalid_email.IndexOf("]",i_start);
        str_invalid_email.Substring(i_start, i_end);
                        
        return str_invalid_email;
}

// This function must remove (or disable) specified
// email address from mailing list
static void RemoveEmailFromDatabase(string str_invalid_email)
{
// TODO: Add your code here                        
}

Dim pop As New Pop3

' Enable logging to file
pop.Log.Enabled = True
pop.Log.Filename = "C:\log.txt"
pop.Log.Clear()

' Connect to POP3 server
pop.Connect("mail.domain.com")
pop.Login("jdoe", "secret")

' Download headers and bodies for all messages.
Dim msgs As MailMessageCollection = pop.DownloadMessageHeaders(1, -1, -1)

' Loop through all messages in the mailbox
Dim msg As MailMessage
For Each msg In msgs
        Dim strLine As String = msg.BodyPlainText
        Console.WriteLine("From: " + msg.From.Email)

        ' Get failed email address
        Dim str_invalid_email As String = GetInvalidEmailAddressME(msg)

        ' If str_invalid_email is non-empty then failed email 
        ' address was found
        If str_invalid_email.Length > 0 Then
                'Remove failed email from database
                RemoveEmailFromDatabase(str_invalid_email)

                ' Display invalid address
                Console.WriteLine("Invalid email: " & str_invalid_email)

                ' Delete bounced email from server to avoid
                ' processing it next time
                pop.DeleteMessage(msg.IndexOnServer)
        End If
Next
Console.ReadLine()

' Disconnect from POP3 server
pop.Disconnect()

' The function checks whether the message is bounced and extracts 
' failed address 
' from bounced message. Valid only for MailEnable servers
Function GetInvalidEmailAddressME(ByVal msg As MailMessage) As String
        Dim str_invalid_email As String = msg.BodyPlainText

        ' Check if this is a bounced message report
        If msg.Subject.IndexOf("Delivery Failure") = -1 Then
                Return ""
        End If
        If msg.From.ToString().IndexOf("POSTMASTER") = -1 Then
                Return ""
        End If

        ' Now we're sure this is a bounced message report
        Dim i_start As Integer, i_end As Integer
        i_start = str_invalid_email.IndexOf("SMTP:")

        ' Check if bounced message report contains "Recipient:" field
        If i_start = -1 Then
                Return ""
        End If

        ' Get failed address
        i_start += 5
        i_end = str_invalid_email.IndexOf("]", i_start)
        str_invalid_email.Substring(i_start, i_end)

        Return str_invalid_email
End Function

' The function checks whether the message is bounced and extracts 
' failed address 
' from bounced message. Valid only for Communigate Pro servers
Function GetInvalidEmailAddressCP(ByVal msg As MailMessage) As String
        Dim str_invalid_email As String = msg.BodyPlainText

        ' Check if this is a bounced message report
        If msg.Subject.IndexOf("Undeliverable mail") = -1 Then
                Return ""
        End If
        If msg.From.ToString().IndexOf("MAILER-DAEMON") = -1 Then
                Return ""
        End If

        ' Now we're sure this is a bounced message report
        Dim i_start As Integer, i_end As Integer
        i_start = str_invalid_email.IndexOf("to '<")

        ' Check if bounced message report contains 
        ' "Failed to deliver to " field
        If i_start = -1 Then
                Return ""
        End If

        ' Get failed address
        i_start += 5
        i_end = str_invalid_email.IndexOf("]", i_start)
        str_invalid_email.Substring(i_start, i_end)

        Return str_invalid_email
End Function

' This function must remove (or disable) specified
' email address from mailing list
Sub RemoveEmailFromDatabase(ByVal str_invalid_email As String)
        ' TODO: Add your code here                        
End Sub