Reply To: How to dynamically determine scanned paper size

[MKJO]

I have looked through the examples you posted and the OpenTwain project you refer to. I have been using the same logic as you are. I actually got my code from the sample project on http://www.codeproject.com/dotnet/twaindotnet.asp.

This is what I have been running. I apologize for not posting all of it to begin with.

            do

{

pxfr.Count = 0;

hbitmap = IntPtr.Zero;



// Per the examples, here is where I am supposed to capture ImageInfo and ImageLayout ...

// But when this code runs the paper is still laying in the tray unscanned.

iinf = new TwImageInfo();

rc = DSiinf(appid, srcds, TwDG.Image, TwDAT.ImageInfo, TwMSG.Get, iinf);

if (rc != TwRC.Success)

{

CloseSrc();

return pics;

}

ilyt = new TwImageLayout();

rc = DSilayout(appid, srcds, TwDG.Image, TwDAT.ImageLayout, TwMSG.Get, ilyt);

if (rc != TwRC.Success)

{

CloseSrc();

return pics;

}



// Store the returned values into my struct - But the values are always the same

// regardless if the paper is 8.5x11 or 5x6

imf = new ImgInfo();

imf.sizeX = iinf.ImageWidth;

imf.sizeY = iinf.ImageLength;

imf.posLeft = ilyt.Frame.Left.ToFloat();

imf.posRight = ilyt.Frame.Right.ToFloat();

imf.posTop = ilyt.Frame.Top.ToFloat();

PictureInfo.Add(imf);



// Now the paper is fed throught the machine and scanned

rc = DSixfer(appid, srcds, TwDG.Image, TwDAT.ImageNativeXfer, TwMSG.Get, ref hbitmap);

if (rc != TwRC.XferDone)

{

CloseSrc();

return pics;

}

// Right here is where I would expect to be able to get my information because the documents have now been scanned.



rc = DSpxfer(appid, srcds, TwDG.Control, TwDAT.PendingXfers, TwMSG.EndXfer, pxfr);

if (rc != TwRC.Success)

{

CloseSrc();

return pics;

}



pics.Add(hbitmap);

}

while (pxfr.Count != 0);

Is there a setting that would cause the scanner to pull in the paper when I call rc = DSiinf(appid, srcds, TwDG.Image, TwDAT.ImageInfo, TwMSG.Get, iinf); and rc = DSiinf(appid, srcds, TwDG.Image, TwDAT.ImageInfo, TwMSG.Get, iinf); ?