Native USB Printing support windows #234
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…linux as well) with complete printer status report back. No driver install or Virtual Serial Port needed. Choose printer from list of usb devices and send data straight to the printer like Serial or Network printer. Possible fix for Isuues : lukevp#186 lukevp#220 lukevp#223
| public uint pid; | ||
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| private static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1); | ||
| [DllImport("setupapi.dll", CharSet = CharSet.Unicode, SetLastError = true)] |
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I'm not sure about this DLL Imports...
I will defer the final decision to @lukevp , but if he is ok with these import, then the PR sounds great.
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Hey all, sorry I missed this. How does this work outside of Windows? This seems like old school COM stuff that's windows / full framework only (not .NET core / .NET standard)
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This is like USB1, USB2.... Planning to mergue it ???
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@lukevp I don't think those imports will work outside windows. From experience with Mono back in the day one would need to have corresponding .so files and etc. Nothing straight forward.
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But, it could be a Windows-only feature, since it seems that only Windows has this issue with USB. Thoughts?
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Hi all,
I developed this feature as a windows only feature, because there wasn't any way of printing to USB printer on Windows without using virtual serial port drivers.
@lukevp As far as I understand Devicefinder.cs doesn't have any other dependency outside .netStandard but yes it only works on windows (finding devices connected).
| //keeping separate file streams performs better | ||
| //while using 1 file stream printers were having intermittent issues while printing | ||
| //your milege may vary | ||
| _rfile = File.Open(usbPath, FileMode.Open, FileAccess.Read); |
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I got an error and cannot findout how to resolve, have you got this error too?
FileStream was asked to open a device that was not a file. For support for devices like 'com1:' or 'lpt1:', call CreateFile, then use the FileStream constructors that take an OS handle as an IntPtr.
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| string path = Marshal.PtrToStringUni(new IntPtr(intPtr2.ToInt64() + 4)); | ||
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| DeviceDetails deviceDetails = GetDeviceDetails(path, intPtr, DeviceInfoData); |
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For some devises (non printers) I got System.ComponentModel.Win32Exception (1168) here - GetDeviceDetails(...).
Maybe it will be a good idea to just to skip the problematic ones (try-catch-continue?) and go on instead of throwing an exception and failing to enumerate any of them.
Implemented native USB Printing support for Windows (should work for linux as well) with complete printer status report back.
No driver install or Virtual Serial Port needed.
Choose printer from list of USB devices and send data straight to the printer like Serial or Network printer.
.Net Standard.
Tested: Epson TM-T82III, Element RW80, Sunmi NT3111, Bixolon E300
Possible fix for Issues : #186 #220 #223