Dynamsoft TWAIN Products

Hello,

I am nearing the end of my evaluation and have only found one problem I can not seem to pin down to get this integrated into our system.

Current setup:
- uploading files via FTP server (Using FTPUploadAsMultiPagePDF, great PDF construction by the way!)
- All functions are identical to examples with the exception of some name changes. (using ADF and SaveToFile examples).

Once in a while, I get a blank error msg box. If I run the scan again, it runs normally. This might be confusing to some of our end users, do you have any current fix for this?

was also wondering if there was a http sample with a code-behind file?

Hi JayGalway,


To better pinpoint the cause of the problem, would you please be more specific about this? When did you get the blank error message box? (If you are using the SaveToFile sample, you may get messages returned from ErrorString or HTTPPostResponseString.)

Do you mean a http sample which is used to upload scanned images to your web server or database? If yes, you can use the HTTP Post method to achieve your requirement. Also you can refer to the SaveToFile or SaveToDB sample which can be found at:
http://www.dynamsoft.com/Downloads/ASP. ... ample.aspx

Sorry about the long reply.

I have found that on the first scan for the pages I want to have scan features I am getting a error msg box with no message, but only on the first scan.

Here are the code snippits for the scanning

<object classid="clsid:3d25aba1-caec-11cf-b34a-00aa00a28331" viewastext>
<param name="LPKPath" value="DynamicWebTwain.lpk" />
</object>

<object classid="clsid:FFC6F181-A5CF-4EC4-A441-093D7134FBF2" id="DynamicWebTwain1"
width="1" height="1" codebase="DynamicWebTwain.cab#version=6,0">
<param name="_cx" value="847" />
<param name="_cy" value="847" />
<param name="JpgQuality" value="80" />
<param name="Manufacturer" value="DynamSoft Corporation" />
<param name="ProductFamily" value="Dynamic Web TWAIN" />
<param name="ProductName" value="Dynamic Web TWAIN" />
<param name="VersionInfo" value="Dynamic Web TWAIN 6.0" />
<param name="TransferMode" value="0" />
<param name="BorderStyle" value="0" />
<param name="FTPUserName" value="" />
<param name="FTPPassword" value="" />
<param name="FTPPort" value="21" />
<param name="HTTPUserName" />
<param name="HTTPPassword" />
<param name="HTTPPort" value="80" />
<param name="ProxyServer" />
<param name="IfDisableSourceAfterAcquire" value="0" />
<param name="IfShowUI" value="-1" />
<param name="IfModalUI" value="-1" />
<param name="IfTiffMultiPage" value="0" />
<param name="IfThrowException" value="0" />
<param name="MaxImagesInBuffer" value="100" />
<param name="TIFFCompressionType" value="0" />
<param name="IfFitWindow" value="-1" />
</object>

function btnScan_click() {
var WEBTWAIN = document.getElementById("DynamicWebTwain1");
WEBTWAIN.SelectSource();
WEBTWAIN.IfShowUI = false;

WEBTWAIN.OpenSource()
if (WEBTWAIN.ErrorCode != 0) {
alert(WEBTWAIN.ErrorString);
}
else {
//Use Automatic Document Feeder (ADF)
WEBTWAIN.IfFeederEnabled = true;

if (WEBTWAIN.IfFeederEnabled == true) {
if (WEBTWAIN.IfPaperDetectable != true) {
alert("Your scanner can not detect if documents are loaded on the ADF or Flatbed.");
WEBTWAIN.CloseSource();
}
else {
if (WEBTWAIN.IfFeederLoaded == true) {
WEBTWAIN.IfAutoFeed = true;
WEBTWAIN.IfDisableSourceAfterAcquire = true;
WEBTWAIN.XferCount = -1;
WEBTWAIN.AcquireImage();

var strHostIP;
var strFileName;

strHostIP = "ftp.nationaltaxsearch.com"; //the host's ip or name
if ($('[id$=txtFileName]').val() == "") {
strFileName = "DocumentsUpload/Upload" + Date.now + ".pdf";
}
else {
strFileName = "DocumentsUpload/" + $('[id$=txtFileName]').val() + ".pdf";
}

WEBTWAIN.FTPUploadAsMultiPagePDF(strHostIP, strFileName);

if (WEBTWAIN.ErrorCode != 0) {
alert(WEBTWAIN.ErrorString);
if (WEBTWAIN.ErrorString == "HTTP process error")
alert(WEBTWAIN.HTTPPostResponseString);
}
}
else {
alert("There is no paper loaded in ADF.");
WEBTWAIN.CloseSource();
}
}
}
else {
alert("Please make sure the Automatic Document Feeder is available.");
WEBTWAIN.CloseSource();
}
}
}

One other side affect from this is despite having set the ImagesinBuffer to 100, it still only puts out a 1 page pdf on a 5 page scan.

Any help you can offer on these two issues would be appreciated. Once these are done I will be able to show an integrated demo to the directors for purchase approval.

Hi JayGalway,


The possible cause of the problem is that when FTPUploadAsMultiPagePDF is executed, there is no image in buffer. When you scan an image, it will be in the control AFTER the whole function btnScan_click(), which includes AcquireImage(), is executed.

If you would like to upload the images in buffer to your FTP site automatically after scanning, instead of calling the upload method directly after AcquireImage(), you can call the method in the OnPostAllTransfers event.
http://www.dynamsoft.com/help/TWAIN/Eve ... nsfers.htm


To upload all scanned images to your FTP site, you can use the FTPUploadAllAsPDF method.
http://www.dynamsoft.com/help/TWAIN/Web ... lAsPDF.htm

Please keep me updated on this issue.

Thanks for the info on the PDF setup.

Everything has been working well so far.

I have one other problem.

I tested out another model scanner today, and the PDF images are now LZW encoded. How can I force a standard encoding (TIFF(LZW,CCITTF,etc.),JPG,PNG,etc.)? I have tried setting PixelType, TIFFCompressionType, JPGQuality, but none seem to affect images put into a PDF.

Hi JayGalway,

You can use the PDFCompressionType property to set the compression type of PDF files.
http://www.dynamsoft.com/help/TWAIN/Web ... onType.htm