Cannot get Epson TM-T88IV Receipt E4 to work

[sofianegargouri]

Hi,

I can't find a way to make my printer work with this library. It is plugged as USB, and I tried both USB dans NativeUsb drivers, without success.

My latest issue is that I'm getting the no suitable interface number found for USB device, but I can't really understand how and why I'm getting this error.

The printer is currently working with other softwares, and the test page from windows does print something.

I'm not that familiar with Rust, I think I'm here like others because we're trying to make printers work with our Tauri app 😅

Here is the code I have that is raising the error:

let driver_result = NativeUsbDriver::open(0x04b8, 0x0202);

let driver = match driver_result {
  Ok(file) => file,
  Err(error) => panic!("{error:?}"),
};

I got the manufacturer and product id by running the examples available in the repository:

for device in nusb::list_devices().unwrap() {
        println!(
            "Bus: {:03} address: {:03} VID: {:04x} PID: {:04x} Manufacturer: {} Product: {} S/N: {}",
            device.bus_number(),
            device.device_address(),
            device.vendor_id(),
            device.product_id(),
            device.manufacturer_string().unwrap_or_default(),
            device.product_string().unwrap_or_default(),
            device.serial_number().unwrap_or_default(),
        );
    }

[fabienbellanger]

Hi,

Unfortunately, I don't use Windows.
But I found this in nusb Interface documentation:

Windows: this is only available for composite devices bound to the usbccgp driver, and will be empty if the entire device is bound to a specific driver.

and this: https://docs.rs/nusb/latest/nusb/#windows

You have this error when trying native_usb.rsexample? Or in Tauri example?

[sofianegargouri]

I'm having this error while trying the native_usb.rs in a Tauri app.
It seems like the device is bound to a specific driver.

What I can't understand is why the device is returned in the list of devices but not available when we try printing with it

[fabienbellanger]

In nusb documentation:

nusb uses WinUSB on Windows.
On Windows, devices are associated with a particular driver, which persists across connections and reboots. Composite devices appear as multiple devices in the Windows device model, and each interface can be associated with a separate driver.
To use nusb, your device or interface must be associated with the WinUSB driver. If you control the device firmware, the recommended way is to use a WCID descriptor to tell Windows to install the WinUSB driver automatically when the device is first connected. Alternatively Zadig (GUI) or libwdi (CLI / C library) can be used to manually install the WinUSB driver for a device.

On a Windows machine, I had the same issue and the solution was to use Zadig.

Do you try to install the printer driver using zadig?

[sofianegargouri]

I'm not sure I'll be able to do that now since the printer is heavily used and I do not have another example, but I'll try doing that.
Thanks mate !

[enkhjile]

@sofianegargouri
Hello, you can try my PR with rusb. It has an option to use libusbdk (no WinUSB is required) backend.
Just install UsbDk beforehand.