add IUsb interface as connection interface for printer library

libsharperang/Base.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using Vadavo.NEscPos;
+using Vadavo.NEscPos.Printable;
 
 namespace libsharperang {
 	public abstract class Base {

libsharperang/IUsb.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using LibUsbDotNet;
+using Vadavo.NEscPos.Connectors;
+
+namespace libsharperang
+{
+    public class IUsb : IPrinterConnector
+    {
+        internal UsbDevice iPrinter;
+        private UsbEndpointReader pReader;
+        private UsbEndpointWriter pWriter;
+        public void Dispose()
+        {
+            pReader?.Dispose();
+            pWriter?.Dispose();
+            IUsbDevice p = iPrinter as IUsbDevice;
+            _ = p?.ReleaseInterface(0);
+            _ = iPrinter?.Close();
+            throw new NotImplementedException();
+        }
+
+        public byte[] Read()
+        {
+            if (pReader == null) pReader = iPrinter.OpenEndpointReader(LibUsbDotNet.Main.ReadEndpointID.Ep01);
+            byte[] bRead = new byte[1024];
+            _ = pReader.Read(bRead, 100, out int _);
+            return bRead;
+        }
+
+        public void Write(byte[] data)
+        {
+            if (pWriter == null) pWriter = iPrinter.OpenEndpointWriter(LibUsbDotNet.Main.WriteEndpointID.Ep01);
+            pWriter?.Write(data, 100, out int _);
+        }
+    }
+}

libsharperang/libsharperang.csproj

@@ -8,6 +8,7 @@
     <PackageReference Include="Device.Net" Version="3.0.0" />
     <PackageReference Include="LibUsbDotNet" Version="2.2.29" />
     <PackageReference Include="NativeUsbLib" Version="1.4.6" />
+    <PackageReference Include="Vadavo.NEscPos" Version="0.0.4" />
     <PackageReference Include="WinUSBNet" Version="1.0.3" />
   </ItemGroup>
 

libsharperang/usb.cs

@@ -3,14 +3,23 @@ using System.Linq;
 using System.Collections.Generic;
 using LibUsbDotNet;
 using LibUsbDotNet.Main;
+using Vadavo.NEscPos.Connectors;
 
 namespace libsharperang {
 	public class USB : Base {
+        //both P1 and P2 models share the same idV and idP over USB
 		public readonly ushort idVendor=0x4348;
 		public readonly ushort idProduct=0x5584;
+        //differentiating between the two is a case of checking the product name
+        //P1 is identified as "MiaoMiaoji" or "MTTII Printer"
+        //P2 is identified as "Paperang_P2"
+        //Notable is that the idV and idP appear to belong not to Paperang, but to a generic CH34x printer adaptor device
+        // so it should be a constraint to check that the device descriptors match known details for supported devices,
+        // not just idV and idP
 		public UsbDevice printer;
 		public List<UsbRegistry> pInstances;
 		public List<Guid> pIds;
+        public IUsb pUsb;
 
 		public USB() {
 			ActiveConnectionType=ConnectionType.USB;
@@ -19,12 +28,13 @@ namespace libsharperang {
 		public bool InitUSB() {
 			//NOTE - in order for this to work, you must use Zadig to change the driver for
 			// the printer from usbprint to WinUSB
-			if (UsbDevice.AllWinUsbDevices.Count == 0) return false;
+            //On MacOS and Linux libusb should "just work" here - testing is pending however.
+			if (UsbDevice.AllDevices.Count == 0) return false;
 			//genuinely just having some fun with Linq, don't judge me.
 			//TODO: work out a way of distinguishing multiple devices with same GUID
 			// which happens when two of the same device are connected
 			// the only thing that differs seemingly is the Address
-			pInstances = (from d in UsbDevice.AllWinUsbDevices
+			pInstances = (from d in UsbDevice.AllDevices
 										where d.Vid == idVendor && d.Pid == idProduct
 										select d)
 										.ToList<UsbRegistry>();
@@ -35,12 +45,12 @@ namespace libsharperang {
 			return (pIds.Count > 0);
 		}
 		public List<int> GetAddressesFromGuid(Guid deviceId) {
-			return (from d in UsbDevice.AllWinUsbDevices
+			return (from d in UsbDevice.AllDevices
 							where d.DeviceInterfaceGuids.Contains(deviceId)
 							select d.DeviceProperties.Where(k => k.Key=="Address").FirstOrDefault().Value).ToList().ConvertAll(v => (int)v);
 		}
 		public bool OpenUSB() {
-			if (UsbDevice.AllWinUsbDevices.Count == 0) return false;
+			if (UsbDevice.AllDevices.Count == 0) return false;
 			if (pIds.Count == 0) return false;
 			return OpenUSB(pIds.FirstOrDefault());
 		}
@@ -49,7 +59,7 @@ namespace libsharperang {
 		}
 		public bool OpenUSB(Guid deviceId, int deviceIndex) {
 			//first thought is to say "forgive me lord for i have sinned" but i am absolutely not repentant for this
-			bool OpenResult = (from d in UsbDevice.AllWinUsbDevices
+			bool OpenResult = (from d in UsbDevice.AllDevices
 												 where d.DeviceInterfaceGuids.Contains(deviceId) && 
 														d.DeviceProperties.Where(k=>k.Key=="Address" && (int)k.Value==deviceIndex).Count() > 0
 												 select d)
@@ -59,6 +69,34 @@ namespace libsharperang {
 			return OpenResult;
 		}
 
+        public bool ClaimUSB()
+        {
+            if (printer is null || printer.IsOpen) return false;
+            IUsbDevice p = printer as IUsbDevice;
+            p?.SetConfiguration(1);
+            p?.ClaimInterface(0);
+            pUsb.iPrinter = printer;
+            return true;
+        }
+
+        
+
+        /*
+         * TODO PollPrinter
+         * disassembly of Paperang for Mac comes up with the following
+         * method.Printer.checkConnect() does:
+         * * method.Printer.checkConnectFlag() && return something
+         * 0x01a022300
+         * 0xffffffff
+         * 0x00000000963007772c610eeeba51099919c46d078ff4
+         * 
+         * need to USBPcap the mac software's comms to confirm above
+         * 
+         * Paperang for Windows does completely different.
+         * ...apparently when the USB URB_CONTROL response says "COMMAND SET:ESC/POS" that means you literally just communicate with it using the ESC/POS protocol
+         * ...so i've wasted a lot of time trying to reverse-engineer an open spec..
+         */
+
 		public string FoundPrinterGuids() => pIds
 																					.ConvertAll(p => p.ToString())
 																					.Aggregate((a, b) => a+","+b);