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Dynamic Web TWAIN是一个专为Web应用程序设计的TWAIN扫描识别控件。你只需在TWAIN接口写几行代码，就可以用兼容TWAIN的扫描仪扫描文档或从数码相机/采集卡中获取图像。然后用户可以编辑图像并将图像保存为多种格式，用户可保存图像到远程数据库或者SharePoint。该TWAIN控件还支持上传和处理本地图像。

本文汇集了一些Dynamic Web TWAIN编程方面的常见问题，并且针对这些问题进行了回答，感兴趣的朋友快来了解一下吧~

点击下载Dynamic Web TWAIN正式版

问题1：如何上传到Web服务器？

答：代码如下

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");
}}

问题2：如何使用ADF？我们希望将每个文档保存在单独的文件中。

答：代码如下

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);
}}

问题3：如何使用SSL？

答：您可以使用IfSSL属性。以下JavaScript示例显示了如何使用IfSSL属性。

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");
}}

相关内容推荐：

Dynamic Web TWAIN常见问题（一）：如何选择使用哪个版本？
Dynamic Web TWAIN常见问题（二）：相比其他的TWAIN SDK，主要优势是什么？
Dynamic Web TWAIN常见问题（三）：Dynamic Web TWAIN将使用哪些操作系统？
Dynamic Web TWAIN常见问题（四）：编程问题-没有用户界面怎么工作？
Dynamic Web TWAIN常见问题（五）：编程问题-如何分别设置水平和垂直分辨率？

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