Question 413940 in Flutter Question posted in
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How to connect Flutter app to Epson CW4000U inkjet printer?

I’m developing a Flutter application that needs to connect to an Epson CW4000U inkjet printer. However, I’m struggling to establish a connection with the printer and access its functionality.

I’ve checked the Epson ColorWorks SDK, but it doesn’t seem to directly expose a printer class that would allow me to connect and print directly from the Flutter app.

What I’ve Tried:

  • I’ve explored the Epson ColorWorks SDK, but there is no clear way to use it for Flutter, and there’s limited documentation on connecting specifically to the CW4000U model.
  • Attempted connecting via IP, but I am unsure how to handle communication for status updates or printing commands.

Questions:

  1. Is there any package or plugin specifically for Flutter that supports the Epson CW4000U?
  2. How can I establish a connection with this printer, ideally in a way that allows for frequent status checks and sending print commands?
  3. Are there any alternatives or recommended approaches for handling this on iOS or Android that could be integrated with Flutter?

Any guidance on how to connect and interact with this printer would be much appreciated.

Tags:

2

Answers


  1. 0

    Unless you are prepared to put in the time required to analyse the traffic to the printer and reverse engineer the protocol you will need to create your own plug in(s) that leverage the native iOS and Android SDKs.

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  2. 0

    I have developed Flutter app that connects to POS ,
    I used the following : esc_pos_printer , screenshot

    the below is helper functions that do actually the print

    Future<void> testReceipt(NetworkPrinter printer, List<int> imgData) async {
  final Image? image = decodeImage(imgData);

  printer.image(image!, align: PosAlign.center);
  printer.cut();
}

void printPOS(String printerIp, List<int> imgData, {int duration = 3}) async {
  const PaperSize paper = PaperSize.mm80;
  final profile = await CapabilityProfile.load();
  final printer = NetworkPrinter(paper, profile);

  final PosPrintResult res = await printer.connect(printerIp, port: 9100);

  if (res == PosPrintResult.success) {
    // DEMO RECEIPT
    await testReceipt(printer, imgData);
    // printer;
    // printer.reset();
    // printer.disconnect();
    // print(res.msg);
    await Future.delayed(Duration(seconds: duration), () {
      // print("prinnter desconect");
      printer.disconnect();
    });
  }
}

    and here is how to call the function you need to wrap the widget with ScreenShot Widget I did this because not all languages are supported I and in arabic and other languages the result is not as expected

    screenshotController.capture(delay: const Duration(milliseconds: 10))
                                    .then((capturedImage) async {
                                  printPOS("192.168.1.87", capturedImage!);

    don’t hesitate to reply if you faced any issue you to check the port number that POS running on

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