NAPS2.Wia

NAPS2.Wia

NAPS2.Wia is a standalone component that acts as a low-level wrapper around Windows Image Acquisition (WIA).

Compared to the COM-based wiaaut.dll, you get:

• WIA 2.0 support
• Better feeder compatibility
• Idiomatic .NET interface

If you're looking for a higher-level and easier-to-use scanning interface, check out NAPS2.Sdk.

Example

using var deviceManager = new WiaDeviceManager();

// Prompt the user to select a scanner
using var device = deviceManager.PromptForDevice();

// Select either "Flatbed" or "Feeder"
using var item = device.FindSubItem("Feeder");

// Scan all pages in the feeder at once
item.SetProperty(WiaPropertyId.IPS_PAGES,
                 WiaPropertyValue.ALL_PAGES);

// Enable duplex scanning
item.SetProperty(WiaPropertyId.IPS_DOCUMENT_HANDLING_SELECT,
                 WiaPropertyValue.DUPLEX);

// Set up the scan
using var transfer = item.StartTransfer();
transfer.PageScanned += (sender, args) =>
{
    using (args.Stream)
    {
        var bitmap = new Bitmap(args.Stream);
        // Do something with the image
    }
};

// Do the actual scan
transfer.Download();

Known issues

• Native acquisition with WIA 1.0 only works in 32-bit processes. NAPS2.Sdk provides a 32-bit worker process that can be used from 64-bit applications. Most users shouldn't be affected since WIA 2.0 has no such issue.

Supported Platforms

• .NET Framework 4.0 (Windows XP+)
• .NET Core 2.0+ (Windows)
• .NET Standard 2.0+ (Windows)

License

Unlike most of NAPS2.Sdk which is licensed under the LGPL, NAPS2.Wia uses the more permissive MIT license.