Dynamsoft TWAIN Products

Hi,
We have been using DT for quite a while in our VB 6.0 application. Now we want move to .Net/C#. We are using the DT 4.1 ActiveX that we purchased earlier for this purpose. However we are facing a few difficulties in Visual Studio 2008.

Our application should display the image in a picturebox control as each page is a scanned. But this doesn't happen with the following code. It shows only the last image when the scanning is completed. How do I show the images as I scan the pages? Please help. Below is the code segment we use now.

[code]
private void TwainHandler_OnPostTransfer(object sender, EventArgs e)
{
if (scannedImage.Image != null)
{
scannedImage.Image.Dispose();
scannedImage.Image = null;
}
scannedImage.Image = TwainHandler.Picture;
// Thread.Sleep(2000); //Added for testing only
GC.Collect();
}
[/code]

> Our application should display the image in a picturebox control as each page is a scanned.
> It shows only the last image when the scanning is completed.

Dynamic TWAIN can not keep the scanned images in buffer. If you want to view the scanned image before saving or uploading them, you can use Dynamic Web TWAIN.

Here is the online demo of Dynamic Web TWAIN. Please have a try and see if it fulfills your requirements.

http://www.dynamsoft.com/Products/WebTW ... ype=ASPNET

Thanks.

Agreed. But we are using this control(4.1) in our VB 6.0 application and this works quite fine there. We are now porting to C# where we face this problem. Also, tried first saving the image to disk and then loading it from disk to a stream and finally showing the image in the picture box using the stream. In this case also, only the last page is shown no matter how many pages I scan. Also, no image is displayed until all the pages are scanned.
The following code also doesn't work. In the case also, only the last page is displayed in the picturebox. Please help.

[code]
private void TwainHandler_OnPostTransfer(object sender, EventArgs e)
{
String _fileName = null;
_fileName = @"c:\images\" + new Random().Next(100000).ToString() + ".tif";
TwainHandler.SaveAsTIFF(_filename);
pictureBox1.Image = Image.FromFile(_filename);
GC.Collect();
}[/code]

Sorry, the code I posted contain a few typos. The actual code is as shown below.

[code]
private void TwainHandler_OnPostTransfer(object sender, EventArgs e)
{
String _fileName = null;
_fileName = @"c:\images\" + new Random().Next(100000).ToString() + ".tif";
TwainHandler.SaveAsTIFF(_fileName );
pictureBox1.Image = Image.FromFile(_fileName );
GC.Collect();
}

Thanks[/code]

Our support team is looking into your issue. I will get you back soon.

Thanks.

We have sent a simple sample of Dynamic TWAIN to you. Please test it and let us know if it works for you.

Thanks.