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What's New in Windows Image Acquisition (WIA) - Win32 apps | Microsoft Learn
Windows Vista introduced Windows Image Acquisition 2. WIA2 supports push scanning and multi-image scanning. Push scanning allows initiating scans and adjusting scanning parameters directly from the scanner control panel. Multi-image scanning allows one to scan several images at once and save them directly as separate files.
This returns a series of bytes that represent the image in the output format returned by the device. This means we can dump this into a MemoryStream and call Image. However, as. NET likes to keep the stream open that could lead to complications and so I usually clone the resulting image. The following extension method will take a given ImageFile and return a standalone Bitmap from it.
Note that this extension method isn't suitable for images with multiple frames e. I don't usually work with multi-page images so I don't have a concrete recommendation for this use-case. I think I'd lean towards saving the result to a temporary file and then using Image.
WIA is very useful for adding basic image printing support to your application, and perfect if you want to add the ability for your applications to capture images from various devices.
It is capable of more than I've demonstrated here, but this article covers the basics and some common uses. The source code for the demonstration as it was at the time of publication can be downloaded from the links on this page, any updates can be found on the GitHub repository. The founder of Cyotek, Richard enjoys creating new blog content for the site. Much more though, he likes to develop programs, and can often found writing reams of code. A long term gamer, he has aspirations in one day creating an epic video game.
Until that time, he is mostly content with adding new bugs to WebCopy and the other Cyotek products. The readme file indicates the Windows Image Acquisition Library v2. It should not be relied upon to support other formats, though they may appear to be supported depending on system configuration.
The download contains the dll, help files, installation instructions and a rash of assorted VB-based demos and no, it does not contain the image shown Instructions for proper installation of the dll and the help files are included in the readme.
Skip to main content. This browser is no longer supported. Table of contents Exit focus mode. For developers familiar with Microsoft Visual Basic 6. Skip to main content. This browser is no longer supported.
For this post we're only interested in scanners, not all the devices. We need to figure out which device is a scanner and which is not. Luckily this information is provided by the WIA platform. Before adding a device to the list we check if it is in fact a scanner. If not, we skip it. Next we wrap the DeviceInfo instance in an instance of the Scanner class and add it to the list.
Once we've determined which scanners are linked to the computer we can instruct them to scan an image. Add a scan button to the main form and add the following code to it's Click event handler. This code checks if you selected a scanner in the ListBox, then instructs the selected scanner to scan an image and saves it to the root of the C-drive.
A connection to the device is established by calling the Connect method of the DeviceInfo instance. This method returns an instance of the Device class.
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