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。这个TWAIN控件还支持上传和处理本地图像。
Dynamic Web TWAIN能够在所有主流浏览器上面进行网页扫描。兼容 Firefox, Mozilla , Chrome , Safari , Opera以及其他的浏览器；目前主要有三个版本：ActiveX, Plugin 和 Mac。
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();
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);
}DWObject.SelectSource(); DWObject.OpenSource(); DWObject.IfShowUI = false; //Set Image Layout DWObject.Unit = EnumDWT_UnitType.TWUN_INCHES; DWObject.SetImageLayout(0, 0, 5, 5); DWObject.AcquireImage();
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(); DWObject.IfShowUI = false; DWObject.IfDisableSourceAfterAcquire = true; DWObject.OpenSource(); DWObject.IfShowIndicator = false; DWObject.AcquireImage();
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();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");
}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);
}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");
}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");
}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();
} 
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