XferCount property not working

[derek_k]

I'm not sure when this stopped working (it did work at some point - maybe in version 6), but the XferCount property is no longer working. The scanner is always scanning ALL pages that are loaded, even though we only want to scan 1 document by setting the XferCount property = 1.

This is happening with HP Scanjet 5000/7000 in both WIA and TWAIN drivers.

I can't find any other options to control auto feeding and restrict it to a single page.

[Alex]

Hello Derek,

What code do you use?

You should disable the document feeder and set the XferCount to 1 if you want to acquire only one image from the scanner.

Best regards, Alexander

[derek_k]

Hi Alex,

The problem is, whenever we try to disable the document feeder we get an exception:

Code: Select all

if (_device.FeederPresent) 
{
    _device.XferCount = 1;
    _device.DocumentFeeder.Enabled = false;  // Vintasoft.Twain.TwainDeviceCapabilityException: Cannot set value of capability.
}

Again, this is on the HP 5000 and 7000 scanners.

Just to reiterate - in version 6.0 we used this code to scan a single page and it worked fine:

Code: Select all

if (_twain.FeederPresent)
{
    _twain.AutoFeed = false;
    _twain.XferCount = 1;
}

[Alex]

Hello Derek,

Please send log-file generated by SDK to support@vintasoft.com

Here are steps which you should do if you want to generate a log-file of scanner's work:

• Set the DeviceManager.Logger.Enabled property to True before the DeviceManager.Open method.
• Set the path to log-file with the DeviceManager.Logger.Filename property if path "c:\vstwain.log" is not accessible by your application.
  NOTE: vstwain.log file is created in the user's temporary directory if path specified in the LogFilePath property is not accessible.
• Run your application.
• Send us a log-file and detailed description of the problem.

Best regards, Alexander