Zebra jPOS：如何支持多个扫描仪

Question

要求：要在 windows 机器上支持多个扫描仪。

工具：

Zebra SDK 扫描器
Zebra 手持式扫描器，即 DS2208
JPOS
Spring 启动应用程序

问题：第一个扫描仪被成功认领。但是，声称第二个扫描仪导致以下异常 "Device is already claimed by another control device".

代码分析：

SymScannerSvc112 作为服务 class 用于手持式扫描仪。
SymScannerSvc112 扩展了 SymScannerSvc。 SymScannerSvc 持有一个静态变量“_fClaimed”。
当第一个扫描仪被认领时，静态变量“_fClaimed”被设置为真。现在，当您尝试声明第二台扫描仪时，以下代码会阻止它，因为“_fClaimed”设置为 true。

代码：SymScannerSvc.java：

this._alreadyClaimed = false;
            if(_fClaimed) {
                this._alreadyClaimed = true;
                this.release();
            }

注意： 1. 扫描仪连接到 USB 端口。

jpos.xml

<?xml version="1.0" encoding="UTF-8"?>
<JposEntries>

<JposEntry logicalName="ZebraScannerSerial">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra Serial" name="Zebra Serial Scanner on COM1" url="https://www.zebra.com"/>

    <!--Other non JavaPOS required properties-->
    <!--Scanner configuration-->
    <!--Comm port device name-->
    <prop name="port" value="COM1"/>
    <!--Baud rate, default=9600, valid values are: 9600, 19200, 38400, 57600, 115200-->
    <prop name="baud" value="9600"/>
    <!--Data bits, default=7, valid values are: 5, 6, 7, 8-->
    <prop name="databits" value="8"/>
    <!--Stop bits, default=1, valid values are: 1=1 stop bit, 2=2 stop bits, 3=1.5 stop bits-->
    <prop name="stopbits" value="1"/>
    <!--Parity, default='O' (Odd), valid values are: 'N'one, 'O'dd, 'E'ven, 'M'ark, 'S'pace-->
    <prop name="parity" value="O"/>
    <!--Port mode, default='B', valid values are: 'B'=Nixdorf-B-->
    <prop name="mode" value="B"/>
    <!--UPC-A Length, default=13, indicates the number of digits generated by the scanner-->
    <!--for UPC-A labels based on the scanner's preamble and check digit settings.-->
    <!--The scanner service uses this value to determine when supplementals are present.-->
    <!--The default value of 13 assumes preamble is set to system character-->
    <!--and country code and that transmit check digit is enabled-->
    <prop name="UPCALength" value="13"/>
    <!--UPC-E Length, default=7, indicates the number of digits generated by the scanner-->
    <!--for UPC-E labels based on the scanner's preamble and check digit settings.-->
    <!--The scanner service uses this value to determine when supplementals are present.-->
    <!--The default value of 7 assumes preamble is set to system character-->
    <!--only and that transmit check digit is disabled-->
    <prop name="UPCELength" value="7"/>

    <!--Scanner type, default=0, valid values are: 7 - NixdofrUSB-->
    <prop name="ScannerType" value="7"/>
    <prop name="ExclusiveClaimLevel" value="0" />
</JposEntry>

<JposEntry logicalName="ZebraScannerUSB">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra USB" name="Zebra Scanner" url="https://www.zebra.com"/>

    <!--Other non JavaPOS required properties-->
    <!--Comm port device name, must be 'USB' for USB scanner-->
    <prop name="port" value="USB"/>
    <!--Scanner type, default=0, valid values are: 6 - IBM HID-->
    <prop name="ScannerType" value="6"/>
    <prop name="ExclusiveClaimLevel" value="1" />
</JposEntry>

<JposEntry logicalName="IBM HANDHELD">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra USB" name="Zebra Scanner" url="https://www.zebra.com" />

    <!--Other non JavaPOS required properties-->
    <!--Comm port device name, must be 'USB' for USB scanner-->
    <prop name="port" value="USB"/>
    <!--Scanner type, default=0, valid values are: 6 - IBM HID-->
    <prop name="ScannerType" value="6"/>
    <prop name="ExclusiveClaimLevel" value="1" />
</JposEntry>

<JposEntry logicalName="ZebraUSBTableTop">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra USB Scanner" name="Zebra Scanner" url="https://www.zebra.com"/>

    <!--Other non JavaPOS required properties-->
    <!--Comm port device name, must be 'USB' for USB scanner-->
    <prop name="port" value="USBIBMTT"/>
    <!--Scanner type, default=0, valid values are: 18944=TableTop(0x4A00)-->
    <!--prop name="ScannerType" value="18944"-->
    <prop name="ScannerType" value="9"/>
    <prop name="ExclusiveClaimLevel" value="0" />
</JposEntry>

<JposEntry logicalName="ZebraUSBHandHeld">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra USB Scanner" name="Zebra Scanner" url="https://www.zebra.com"/>

    <!--Other non JavaPOS required properties-->
    <!--Comm port device name, must be 'USB' for USB scanner-->
    <prop name="port" value="USBIBMHID"/>
    <!--Scanner type, default=0, valid values are: 19200=HandHeld(0x4B00)-->
    <prop name="ScannerType" value="19200"/>
    <prop name="ExclusiveClaimLevel" value="0" />
</JposEntry>

<JposEntry logicalName="ZebraUSBOPOS">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra USB Scanner" name="Zebra Scanner" url="https://www.zebra.com"/>

    <!--Other non JavaPOS required properties-->
    <!--Comm port device name, must be 'USB' for USB scanner-->
    <prop name="port" value="USBOPOS"/>
    <!--Scanner type, default=0, valid values are: 13 -->
    <prop name="ScannerType" value="13"/>
    <prop name="ExclusiveClaimLevel" value="0" />
</JposEntry>

<JposEntry logicalName="ZebraScannerSNAPI">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra SNAPI Scanner" name="Zebra Scanner" url="https://www.zebra.com"/>

    <!--Other non JavaPOS required properties-->
    <!--Comm port device name, must be 'USB' for USB scanner-->
    <prop name="port" value="SNAPI"/>
    <!--Scanner type, default=0, valid values are: 2 - SNAPI-->
    <prop name="ScannerType" value="2"/>
    <prop name="ExclusiveClaimLevel" value="0" />
</JposEntry>


<JposEntry logicalName="ZebraAllScanners">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra Serial/USB Scanner" name="Zebra Scanner" url="https://www.zebra.com"/>

    <!--Scanner type, default=0, valid values are: 1- ALL Scanners-->
    <prop name="ScannerType" value="1"/>
    <prop name="ExclusiveClaimLevel" value="0" />
</JposEntry>

<JposEntry logicalName="IBM HANDHELD">
    <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos category="Scanner" version="1.12"/>
    <product description="Zebra Serial/USB Scanner" name="Zebra Scanner" url="https://www.zebra.com"/>

    <!--Scanner type, default=0, valid values are: 1- ALL Scanners-->
    <prop name="ScannerType" value="1"/>
    <prop name="ExclusiveClaimLevel" value="0" />
</JposEntry>


<JposEntry logicalName="ZebraScale">
    <creation factoryClass="com.motorola.jpos.service.SvcServiceInstanceFactoryImpl" serviceClass="com.motorola.jpos.service.scale.ScaleService113Impl"/>
    <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
    <jpos   category="Scale" version="1.13"/>
    <product description="Zebra Scale" name="Zebra Scale" url="https://www.zebra.com"/>     
    <prop name="ErrorOnSameWeight" value="1"/>
</JposEntry>

Answer 1

我认为它可能已经清楚了。评论里写的追加说明要求是不需要的

这是因为服务对象的原始设计不正确。未创建服务对象，因此一个应用程序可以同时使用同一供应商的多个扫描仪。

可能由于Java语言的特性，厂商构建了问题，试图轻松实现难以实现的排除控制。

如果您想同时使用多个扫描仪，请考虑设备配置，以便每个扫描仪使用不同的服务对象。

就jpos.xml而言，所有 Zebra 扫描仪似乎都使用相同的服务对象，因此请准备其他供应商的扫描仪。

另外：

"consider setting the device so that each scanner operates on a different service object"表示，例如，当多个扫描仪同时连接到一个POS机时，Zebra DS2208作为第一台设备，Honeywell Genesis 7580g作为第二台设备，Denso-Wave QK30作为第三个设备，请勿连接一个供应商的多个扫描仪。

原因是jpos.xml中每个设备条目的后面部分指定了要操作的服务对象，但即使是另一个扫描器（例如"ZebraScannerSerial"和"ZebraScannerUSB"），这个内容如果相同，则认为是同一个服务对象工作。

 <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>

并且如果认为同一个Zebra服务对象共享变量'_fClaimed'，就会出现问题现象。

Answer 2

JPOS 逻辑名称“ZebraAllScanners”允许不同 USB 端口上的扫描仪将条码传输到 spring 启动应用程序的单个实例。

            <JposEntry logicalName="ZebraAllScanners">
                            <creation factoryClass="com.motorola.jpos.service.scanner.SymScannerSvc112Factory" serviceClass="com.motorola.jpos.service.scanner.SymScannerSvc112"/>
                            <vendor name="Zebra Technologies" url="https://www.zebra.com"/>
                            <jpos category="Scanner" version="1.12"/>
                            <product description="Zebra Serial/USB Scanner" name="Zebra Scanner" url="https://www.zebra.com"/>

                            <!--Scanner type, default=0, valid values are: 1- ALL Scanners-->
                            <prop name="ScannerType" value="1"/>
                            <prop name="ExclusiveClaimLevel" value="0" />
            </JposEntry>

Zebra jPOS：如何支持多个扫描仪

Zebra jPOS: How to have support for multiple scanners

java

barcode-scanner

javapos

另外：