Flatbed scanning region

[subhajit]

hi all,

Please help me out. My scanner is a flatbed canon scanner (canon 5600f) with twain compatible and my application is based on C#.net 3.5.
I just want to tell the scanner to scan a specific region, that means, that light bar(sensor) will travel a specific region. I found some solution in the net, but unfortunately those are not working. The sensor travel allover the region. Below is my code,
TwainImageLayout layout = new TwainImageLayout();
rc = DSilayout(appid, srcds, TwDG.Image, TwDAT.ImageLayout, TwMSG.Get, layout);
if (rc != TwRC.Success)
{
CloseSrc();
return false;
}

// 1 inch from the top and 0 from the left
layout.Frame.Top.FromFloat(0);

layout.Frame.Left.FromFloat(0);

layout.Frame.Right.FromFloat(6);

layout.Frame.Bottom.FromFloat(3);

layout.FrameNumber = 1;
layout.PageNumber = 1;
layout.DocumentNumber = 1;

rc = DSilayout(appid, srcds, TwDG.Image, TwDAT.ImageLayout, TwMSG.Set,layout);
if (rc != TwRC.Success)
{
CloseSrc();
return false;
}

Is it a right way to do that? what are the values, I should provide for Top, Left, Right, Bottom (These values are really confused me!!!!).

Please help me out.

Thanks,
subhajit

[subhajit]

knock knock, anybody plzz help me, I am just stuck………..

[Catherine Sea]

With your settings below, you should get 3 inch from the top and 6 inch from the left.

layout.Frame.Top.FromFloat(0);
layout.Frame.Left.FromFloat(0);
layout.Frame.Right.FromFloat(6);
layout.Frame.Bottom.FromFloat(3);

You may check out a working demo using Dynamic .NET TWAIN.

When I set (0,0,8,8), we will get the image like this:
[attachment=0:1k7cjwrl]SetImageLayout – Dynamic .net twain.png[/attachment:1k7cjwrl]

Related code:

private void btnSetAndAcquire_Click(object sender, System.EventArgs e)

{

float fFrameLeft, fFrameTop, fFrameRight, fFrameBottom;



try

{

fFrameLeft = Convert.ToSingle(edtFrameLeft.Text);

fFrameTop = Convert.ToSingle(edtFrameTop.Text);

fFrameRight = Convert.ToSingle(edtFrameRight.Text);

fFrameBottom = Convert.ToSingle(edtFrameBottom.Text);

}

catch (Exception)

{

MessageBox.Show("Please input numerical values in the input boxes.", "Error");

return;

}



dynamicDotNetTwain.SelectSource();

dynamicDotNetTwain.OpenSource();			//make dynamicDotNetTwain ready for capability negotiation



if (dynamicDotNetTwain.SetImageLayout(fFrameLeft,fFrameTop,fFrameRight,fFrameBottom) == false)

MessageBox.Show(dynamicDotNetTwain.ErrorString, "Error");



dynamicDotNetTwain.IfShowUI = false;

dynamicDotNetTwain.IfDisableSourceAfterAcquire = true;

dynamicDotNetTwain.EnableSource();



}

Hope it helps.

[subhajit]

Thank you very much for your reply, but can it be possible with simply using TWAIN32.dll? Because the library u have mentioned, is pretty expensive!

Please help.

[Catherine Sea]

Yes. Try update your code below as follows and see how it works.

layout.FrameNumber = -1;

layout.PageNumber = -1;

layout.DocumentNumber = -1;

Catherine Sea
http://www.dynamsoft.com

[spike]

Hi subhajit – is the TWAIN device in the Open state when you start that code?

and after that code, you start a scan by doing something like Enable or EnableSource?
(I don’t know this particular library you are using).

Both your DSilayout calls return TWRC_SUCCESS?

Are you setting any other scanning parameters?
I hope if you are setting ICAP_UNITS at all, it is to TWUN_INCHES 😉

You could download and try something like my Twirl app, to see how your Canon responds to ImageLayout.
http://eztwain.com/twirl.htm
At least then you could have the confidence that the commands *should* work, and you can concentrate on digging into the code to see where things go awry.

[Damoms]

Thank you very much for your reply, but can it be possible with simply using TWAIN32.dll?

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