iOS 仅使用 Epos2Printer 打印一次

Question

我正在使用以下代码使用Epson ePOS SDK for iOS SDK 在Epson TM-T20 上打印一些东西。问题是该应用程序只打印一次。必须重新启动应用程序才能再次打印。代码有什么问题？

    printer = Epos2Printer(printerSeries: 2, lang: 1)
    printer?.setReceiveEventDelegate(self)
    printer?.addText("text")

    printer!.connect("TCP:192.168.1.185", timeout:Int(EPOS2_PARAM_DEFAULT))
    printer!.beginTransaction()

    printer?.sendData(Int(EPOS2_PARAM_DEFAULT))
    printer?.endTransaction()
    // printer?.disconnect()
    printer?.clearCommandBuffer()
    printer?.setReceiveEventDelegate(nil)

尽管在文档中使用了printer?.disconnect()，但应用程序会冻结，所以我不得不将其注释掉。

如果您想查看 API 文档，the SDK's download 中有一个 PDF。

更新： 根据答案更新代码（应用仍然冻结）：

func printReceipt() {
    var printer: Epos2Printer?
    printer = Epos2Printer(printerSeries: 2, lang: 1)
    if printer == nil {
      print(“Printer not found!! 11")
    }
    printer?.setReceiveEventDelegate(self)

    printer?.addTextFont(2)
    printer?.addTextSize(1, height: 1)
    printer?.addText(“My Text")
    printer?.addFeedUnit(10)
    printer?.addCut(0)

    var result: Int = Int(EPOS2_SUCCESS.rawValue)

    result = Int(printer!.connect("TCP:192.168.1.185", timeout:Int(EPOS2_PARAM_DEFAULT)));
    result = Int(printer!.beginTransaction())

    printer?.sendData(Int(EPOS2_PARAM_DEFAULT))

    DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async {
      printer?.clearCommandBuffer()
      printer?.setReceiveEventDelegate(nil)
      printer?.endTransaction()
      printer?.disconnect()
      printer = nil;
    }
  }

Answer 1

我也有同样的问题，您必须实现 Epos2PtrReceiveDelegate 并使用 onPtrReceive 遵守其协议，并包括断开该委托内的打印机。 p>

示例如下：

希望对你有帮助！

public func onPtrReceive(_ printerObj: Epos2Printer!, code: Int32, status: Epos2PrinterStatusInfo!, printJobId: String!) {

        printerObj.endTransaction()
        printerObj.disconnect()
        printerObj.clearCommandBuffer()
        printerObj.setReceiveEventDelegate(nil)

    }

干杯！

Answer 2

供日后参考。

请看示例代码：

class ReportsViewController: UIViewController, Epos2PtrReceiveDelegate {

    func printReport() {

        let header = printer_model.getReportHeader()
        let content = printer_model.getReportContent()

        printer = Epos2Printer(printerSeries: EPOS2_TM_T88.rawValue, lang: EPOS2_MODEL_ANK.rawValue)

        printer!.setReceiveEventDelegate(self) 

        printer!.addFeedLine(1)

        printer!.addTextFont(1)
        printer!.addTextAlign(1)

        let logoData = UIImage(named: "logo.png")

        printer!.add(logoData!, x: 0, y:0,
                     width:Int(logoData!.size.width),
                     height:Int(logoData!.size.height),
                     color:EPOS2_COLOR_1.rawValue,
                     mode:EPOS2_MODE_MONO.rawValue,
                     halftone:EPOS2_HALFTONE_DITHER.rawValue,
                     brightness:Double(EPOS2_PARAM_DEFAULT),
                     compress:EPOS2_COMPRESS_AUTO.rawValue)

        printer!.addText("\n")
        printer!.addText(header)
        printer!.addText(content)
        printer!.addText(constants.PRINTER_LINE)

        printer!.addFeedLine(1)

        printer!.addCut(EPOS2_CUT_FEED.rawValue)

        let status = printer!.connect("TCP:\(PRINTER_IP_ADDRESS)", timeout: PRINTER_TIMEOUT)

        if status != 0 {

            // error
            // handle your logic here if you cannot connect to the printer

            self.printerErrorPrompt()

        } else {

            // send your data to the printer

            printer!.beginTransaction()
            printer!.sendData(Int(EPOS2_PARAM_DEFAULT))

        }
    }

}

在这里实现委托方法

public func onPtrReceive(_ printerObj: Epos2Printer!, code: Int32, status: Epos2PrinterStatusInfo!, printJobId: String!) {
      DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async(execute: {
          printerObj.endTransaction()
          printerObj.disconnect()
          printerObj.clearCommandBuffer()
          printerObj.setReceiveEventDelegate(nil)
      })


}

干杯！

Answer 3

我使用了 Yun Chen 和 rjcruz 提供的类似代码。我的打印机也是 Epson TM-T20。我发现，disconnect() 函数本身会使我的应用程序冻结，无论它放在哪里。唯一可行的解​​决方案是完全避免 disconnect()。所以为了避免卡顿，你可以试试rjcruz提供的代码，只是去掉了disconnect()函数。 希望这会有所帮助！

示例代码：

func print() {
        printer = Epos2Printer(printerSeries: 2, lang: 1)
        printer?.setReceiveEventDelegate(self)
        printer?.addTextSize(2, height: 2)
        printer?.addText("My text")            
        printer?.addFeedUnit(10)
        printer?.addCut(0)
        printer!.connect("TCP:192.168.1.185", timeout:Int(EPOS2_PARAM_DEFAULT))
        printer!.beginTransaction()
        printer?.sendData(Int(EPOS2_PARAM_DEFAULT))
}

public func onPtrReceive(_ printerObj: Epos2Printer!, code: Int32, status: Epos2PrinterStatusInfo!, printJobId: String!) {
        printer?.clearCommandBuffer()
        printer?.setReceiveEventDelegate(nil)
        printer?.endTransaction()
}

Answer 4

根据 SDK 中的 iOS 演示，断开连接动作应该在子线程中，这样可以避免应用程序被冻结。我猜想在disconnect()函数被成功调用后，它将能够打印多次。

尝试（Swift3）：

DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async {
    printer?.endTransaction()
    printer?.disconnect()

    DispatchQueue.main.async {
        //Do UI updating work in Main thread, like enable Print button again.
    }
}

Answer 5

我遇到了同样的问题，您必须实现 Epos2PtrReceiveDelegate 并使用 onPtrReceive 遵守其协议，并包括断开该委托内的打印机。 p>

这是一个代码示例：

public func onPtrReceive(_ printerObj: Epos2Printer!, code: Int32, status: Epos2PrinterStatusInfo!, printJobId: String!) {
        
    printerObj.endTransaction()
    printerObj.disconnect()
    printerObj.clearCommandBuffer()
    printerObj.setReceiveEventDelegate(nil)
}