flutter_desktop_scanner

Description:

flutter desktop scanner

flutter_desktop_scanner #
Making scanning with physical scanners on desktop a breeze!
Getting Started #
Because this plugin depends on some system libraries (SANE, WIA) you have to set up them up for linking in your flutter project.
Linux #

Here's how to setup linking
In ./linux/CMakeLists.txt under:
apply_standard_settings(${BINARY_NAME})
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add:
set(LINKER_FLAGS "-lsane")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${LINKER_FLAGS}")
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Windows #
Nothing to do here! WIA is generally available as a header file.
MacOS #
Nothing to do here! MacOS uses the ImagCaptureCore framework which should be available since 10.14.
Using the plugin #
Because the scanning process for devices, as well as the literal scanning, takes some time the plugin is based on EventChannels. EventChannels are like MethodChannels but for streams, which allow for getting data from native platforms via a stream. Because of that you always have to get a stream reference before initiating an action.
Here's how to get devices:
final _flutterDesktopScannerPlugin = FlutterDesktopScannerPlugin();

...

// always get the stream first
final scannerStream = _flutterDesktopScannerPlugin.getDevicesStream();

scannerStream.listen((scanners) {
setState(() {
_scanners = scanners;
_loading = false;
});
});

// then call the init method
await _flutterDesktopScannerPlugin.initGetDevices();
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And here how you can initiate a scan:
final _flutterDesktopScannerPlugin = FlutterDesktopScannerPlugin();

...

// again get the stream first;
// imageReprStream returns a Image class that can be
// encoded into any image format
final stream = _flutterDesktopScannerPlugin.imageReprStream();

stream.listen((image) {
setState(() {
if (image != null) {
_imgBytes = img.encodePng(image);
}
_imgLoading = false;
});
});

// and then init the scan
await _flutterDesktopScannerPlugin.initScan(scanner);
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Scan representations #
imageReprStream: This stream returns an Image class that can be encoded into any image format (JPG, PNG, ...) for a full list see here
rawBytesStream: This stream returns a Uint8List containing the raw image bytes.
The format is different on each platform:

For linux it's PNM.
For windows it's (most likely) one of BMP / TIFF.
For MacOS it's PNG.