Dynamic Web TWAIN是一個專為Web應用程序設計的TWAIN掃描識別控件。你只需在TWAIN接口寫幾行代碼，就可以用兼容TWAIN的掃描儀掃描文檔或從數碼相機/采集卡中獲取圖像。然后用戶可以編輯圖像并將圖像保存為多種格式，用戶可保存圖像到遠程數據庫或者SharePoint。該TWAIN控件還支持上傳和處理本地圖像。

本文匯集了一些Dynamic Web TWAIN編程方面的常見問題，并且針對這些問題進行了回答，感興趣的朋友快來了解一下吧~

點擊下載Dynamic Web TWAIN正式版

問題1：如何上傳到Web服務器？

答：代碼如下

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

問題2：如何使用ADF？我們希望將每個文檔保存在單獨的文件中。

答：代碼如下

var iDocumentCounter =0; iDocumentCounter =0;

function BeginScan(){function BeginScan(){
    DWObject.OpenSource();DWObject.OpenSource();

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

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

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

function DWObject_OnPosttransfer(){function DWObject_OnPosttransfer(){
iDocumentCounter = iDocumentCounter + 1;= iDocumentCounter + 1;

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

問題3：如何使用SSL？

答：您可以使用IfSSL屬性。以下JavaScript示例顯示了如何使用IfSSL屬性。

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

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

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

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

相關內容推薦：

Dynamic Web TWAIN常見問題（一）：如何選擇使用哪個版本？
Dynamic Web TWAIN常見問題（二）：相比其他的TWAIN SDK，主要優勢是什么？
Dynamic Web TWAIN常見問題（三）：Dynamic Web TWAIN將使用哪些操作系統？
Dynamic Web TWAIN常見問題（四）：編程問題-沒有用戶界面怎么工作？
Dynamic Web TWAIN常見問題（五）：編程問題-如何分別設置水平和垂直分辨率？

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