added usbdk as backend for window

README.md

@@ -5,6 +5,7 @@ A cross-platform (Android/Windows/macOS/Linux) USB plugin for Flutter
 ## Usage
 
 - [List devices](#list-devices)
+  - [Note for window](#note-for-window)
 - [List devices with additional description](#list-devices-with-additional-description)
 - [Get device description](#get-device-description)
 - [Check/Request permission](#checkrequest-permission)
@@ -24,6 +25,13 @@ var deviceList = await QuickUsb.getDeviceList();
 await QuickUsb.exit();
 ```
 
+#### Note for window
+
+libusb can utilize [USBDK](https://github.com/libusb/libusb/wiki/Windows#how-to-use-libusb-on-windows) backend to open an USB port. This allow user to skip driver installation. However, user machine are required to install UsbDk on the window device, the installer can be found on the [github release](https://github.com/daynix/UsbDk/releases)
+```dart
+await QuickUsb.init(window: QuickUsbWindowConfig(useUsbdk: true));
+```
+
 ### List devices with additional description
 
 Returns devices list with manufacturer, product and serial number description.

example/lib/main.dart

@@ -63,7 +63,8 @@ class _MyAppState extends State<MyApp> {
         RaisedButton(
           child: Text('init'),
           onPressed: () async {
-            var init = await QuickUsb.init();
+            var init = await QuickUsb.init(
+                window: QuickUsbWindowConfig(useUsbdk: true));
             log('init $init');
           },
         ),

lib/quick_usb.dart

@@ -33,7 +33,8 @@ QuickUsbPlatform get _platform {
 }
 
 class QuickUsb {
-  static Future<bool> init() => _platform.init();
+  static Future<bool> init({QuickUsbWindowConfig? window}) =>
+      _platform.init(window: window);
 
   static Future<void> exit() => _platform.exit();
 

lib/src/common.dart

@@ -174,3 +174,10 @@ class UsbDeviceDescription {
   @override
   String toString() => toMap().toString();
 }
+
+class QuickUsbWindowConfig {
+  bool useUsbdk;
+  QuickUsbWindowConfig({
+    required this.useUsbdk,
+  });
+}

lib/src/quick_usb_android.dart

@@ -9,7 +9,7 @@ const MethodChannel _channel = const MethodChannel('quick_usb');
 
 class QuickUsbAndroid extends QuickUsbPlatform {
   @override
-  Future<bool> init() async {
+  Future<bool> init({QuickUsbWindowConfig? window}) async {
     return true;
   }
 

lib/src/quick_usb_desktop.dart

@@ -32,14 +32,26 @@ class QuickUsbLinux extends _QuickUsbDesktop {
 
 class _QuickUsbDesktop extends QuickUsbPlatform {
   Pointer<libusb_device_handle>? _devHandle;
+  Pointer<Pointer<libusb_context>>? ctxPointer;
 
   @override
-  Future<bool> init() async {
+  Future<bool> init({QuickUsbWindowConfig? window}) async {
+    if (window != null) {
+      if (window.useUsbdk == true) {
+        ctxPointer = ffi.calloc<Pointer<libusb_context>>();
+        _libusb.libusb_init(ctxPointer!);
+        _libusb.libusb_set_option(
+            ctxPointer!.value, libusb_option.LIBUSB_OPTION_USE_USBDK);
+      }
+    }
     return _libusb.libusb_init(nullptr) == libusb_error.LIBUSB_SUCCESS;
   }
 
   @override
   Future<void> exit() async {
+    if (ctxPointer != null) {
+      ffi.calloc.free(ctxPointer!);
+    }
     return _libusb.libusb_exit(nullptr);
   }
 

lib/src/quick_usb_platform_interface.dart

@@ -1,6 +1,7 @@
 import 'dart:typed_data';
 
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
 import 'package:quick_usb/src/common.dart';
 
 abstract class QuickUsbPlatform extends PlatformInterface {
@@ -22,7 +23,7 @@ abstract class QuickUsbPlatform extends PlatformInterface {
     _instance = instance;
   }
 
-  Future<bool> init();
+  Future<bool> init({QuickUsbWindowConfig? window});
 
   Future<void> exit();
 
@@ -46,9 +47,11 @@ abstract class QuickUsbPlatform extends PlatformInterface {
 
   Future<bool> releaseInterface(UsbInterface intf);
 
-  Future<Uint8List> bulkTransferIn(UsbEndpoint endpoint, int maxLength, int timeout);
+  Future<Uint8List> bulkTransferIn(
+      UsbEndpoint endpoint, int maxLength, int timeout);
 
-  Future<int> bulkTransferOut(UsbEndpoint endpoint, Uint8List data, int timeout);
+  Future<int> bulkTransferOut(
+      UsbEndpoint endpoint, Uint8List data, int timeout);
 
   Future<UsbDeviceDescription> getDeviceDescription(UsbDevice usbDevice);