WiaEnableDuplex

[gdptester]

Hi,

how can I enable the Wia Duplex Scan? I have tried the following code without success:
...
oGdPictureImaging.WiaEnableDuplex(true);
oGdPictureImaging.WiaSelectFeeder(true);
do
{
ImageID = oGdPictureImaging.WiaAcquireToGdPictureImage();
if (ImageID != 0)
...

Thank you!

[SamiKharma]

Hi,

Please check the return status of the function: WiaEnableDuplex. If the result is false, please use WiaGetLastError to diagnose the problem.

Best,
Sami

[gdptester]

Hi Sami,

the result of WiaEnableDuplex is true and WiaGetLastError returns WIA_OK.
The Problem is that WiaAcquireToGdPictureImage() only acquires the front side.

The same scanner (Kodak i1120) can scan Duplex with GdPicture Twain and with Windows Fax&Scan also Duplex is possible with this Scanner using Wia.

Thank you!

[SamiKharma]

Hi,

Unfortunately, WIA is usually poorly implemented and when TWAIN is available this is what should be used especially with document feeder where WIA never works as expected.
Please see point 4 in the following topic: viewtopic.php?t=1486

Best,
Sami

[gdptester]

Hi,

Unfortunately, I have to implement a running solution for both Twain and Wia. I have tried this:

if(oGdPictureImaging.WiaIsDuplexAvailable())
if(oGdPictureImaging.WiaIsDuplexEnabled() == false)
if(oGdPictureImaging.WiaEnableDuplex(true) == false)
rc = (int) oGdPictureImaging.WiaGetLastError();
else
if (oGdPictureImaging.WiaIsDuplexEnabled() == false)
rc = (int)oGdPictureImaging.WiaGetLastError();

The second WiaIsDuplexEnabled() returns true, so WiaEnableDuplex(true) seem to do something.

How do I have to proceed if WiaAcquireToGdPictureImage() is not scanning the back side? What else can I try?

Thank you!

[SamiKharma]

Hi,

Again, unfortunately the WIA protocol has problems controlling the document feeder and using it. If you have Twain I highly suggest you use it.
Unfortunately this is out of the control of GdPicture.

Best,
Sami

[gdptester]

Hi Sami,

if Windows Fax and Scan can scan Duplex with WIA on the same scanner, the bug has to be either in GdPicture or in my code. Is there any sample code for WiaEnableDuplex available? My code only acquires the front page:
...
oGdPictureImaging.WiaEnableDuplex(true);
do
{
ImageID = oGdPictureImaging.WiaAcquireToGdPictureImage();
...

Thank you!

[SamiKharma]

Hi,

This issue would require further investigation. Please supply us with a code that recreates the problem and the problem only and attach it to a support ticket with explanation of the issue at our support platform:
http://support.orpalis.com/

Best,
Sami