Scan documents with ADF Scanner...

[bharate.umesh]

Hello.

I'm developing an application with VintasoftTwain.Net library 5.0.

It is working fine with FLATBED scanner. It scans document one by one.

I used the following code.

Dim oImageMemoryStream as memorystream

If bFirstImage Then
oImageMemoryStream = VSTwain.GetImageAsStream(0, ImageFileFormat.TIFF)

bFirstImage = False
Else
VSTwain.SaveImageToStream(0, oImageMemoryStream, ImageFileFormat.TIFF)

oImageMemoryStream = VSTwain.GetImageAsStream(0, ImageFileFormat.TIFF)
End If

And then it is uploaded to the FTP.

I want to know, how I upload the multiple pages with ADF scanner?

How I detect whether the Scanner is FLATBED or ADF?

And How I create a single TIFF file, if I scanned 100 pages?

Please specify the code.

Thanks,
Umesh

[Alex]

Hello Umesh,

I want to know, how I upload the multiple pages with ADF scanner?

Your code has logical mistake, here is correct code:

Code: Select all

Dim oImageMemoryStream as memorystream

If bFirstImage Then
  oImageMemoryStream = VSTwain.GetImageAsStream(0, ImageFileFormat.TIFF)
  bFirstImage = False
Else
  VSTwain.SaveImageToStream(0, oImageMemoryStream, ImageFileFormat.TIFF)
  ' Next line of code is not necessary because it removes previously saved images
  ' oImageMemoryStream = VSTwain.GetImageAsStream(0, ImageFileFormat.TIFF)
End If

How I detect whether the Scanner is FLATBED or ADF?

Please read description of the FlatbedPresent and FeederPresent properties in the documentation.

And How I create a single TIFF file, if I scanned 100 pages?

Please read the description of the SaveImage method and see this FAQ:
http://www.vintasoft.com/vstwain-dotnet ... fWithoutUi

Best regards, Alexander

[bharate.umesh]

Thanks Alexy.

But I have the problem, when I scanned multiple images and upload it to the FTP.

Suppose I placed 2 pages into ADF scanner, acquired it and finally upload the file to the FTP.

I get the first image scanned correctly, but the second image is the copy of first image .

Actually getting the result 2 pages with the content of the first page.

Since I'm using VintaSoftTwain.NET SDK v6.0

Please give your suggestions.

[Alex]

I get the first image scanned correctly, but the second image is the copy of first image.

What value of the MaxImages property do you use?

You should use the code below if value of the MaxImages property is greater 1:

Code: Select all

If bFirstImage Then
  oImageMemoryStream = VSTwain.GetImageAsStream(VSTwain1.NumImages - 1, ImageFileFormat.TIFF)
  bFirstImage = False
Else
  VSTwain.SaveImageToStream(VSTwain1.NumImages - 1, oImageMemoryStream, ImageFileFormat.TIFF)
End If