iOS只使用Epos2Printer打印一次

Question

我使用下面的代码在Epson TM-T20上使用Epson ePOS SDK for iOS SDK打印一些东西。问题是这个应用程序只打印一次。该应用程序必须重新启动，以便能够再次打印。密码怎么了？

    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)

尽管在文档中使用过，但使用printer?.disconnect()会使应用程序冻结，所以我不得不将其注释掉。

如果您想查看API文档，SDK下载中有一个PDF。

更新：基于答案的更新代码(应用程序仍然冻结)：

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

我使用一个类似的代码，由云陈和rjcruz提供。我的打印机也是爱普生T20.我发现，disconnect()函数本身就会使我的应用程序冻结，不管它放在哪里。唯一可行的解决方案是避免完全断开()。因此，为了避免冻结，您可以尝试使用rjcruz提供的代码，只需删除disconnect()函数即可。希望这能有所帮助！

样本代码：

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 2

我也有同样的问题，您必须使用onPtrReceive实现该onPtrReceive并符合其协议，并包括在该委托中断开打印机。

以下是样本：

希望它能帮到你！

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

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

    }

干杯!

Answer 3

将来可以用来作参考。

请参阅示例代码：

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!