Question

要求：要在Windows计算机上支持多台扫描仪。

工具：

Zebra SDK扫描器
Zebra手持式扫描仪，即DS2208
JPOS
Spring Boot应用程序

问题：成功声明了第一台扫描仪。但是，声称第二台扫描仪导致以下异常 “该设备已被另一个控制设备要求保护。”

代码分析：

SymScannerSvc112作为用于手持式扫描仪的服务类。
SymScannerSvc112扩展了SymScannerSvc。 SymScannerSvc包含静态变量“ _fClaimed”。
要求使用第一台扫描仪时，静态变量'_fClaimed'被设置为true。现在，当您尝试索取第二台扫描仪时，由于“ _fClaimed”设置为true，因此以下代码将其阻塞。

代码：SymScannerSvc.java ：

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

注意： 1.扫描仪已连接到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

我认为情况可能已经清楚了。注释中没有额外的解释要求。

这是因为服务对象的原始设计不正确。没有创建服务对象，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。

也许由于Java语言的特性，供应商制造了此问题，试图轻松实现难以实现的排除控制。

如果要同时使用多台扫描仪，请考虑设备配置，以便每台扫描仪可以使用不同的服务对象。

就jpos.xml而言，所有Zebra扫描器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器。

此外：

“考虑设置设备，以使每个扫描仪在不同的服务对象上运行”，例如，当将多个扫描仪同时连接到单个POS时，例如作为第一台设备的Zebra DS2208，Honeywell Genesis 7580g作为第二设备，而Denso-Wave QK30作为第三设备，请勿连接一个供应商的多台扫描仪。

原因是jpos.xml中每个设备条目的以下部分指定了要操作的服务对象，但是即使它是另一个扫描程序（例如“ ZebraScannerSerial”和“ ZebraScannerUSB”），该内容也一样。，则同一服务对象将被认为可以正常工作。

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

如果同一Zebra服务对象被认为共享变量'_fClaimed'，则会出现问题现象。

Answer 2

JPOS逻辑名“ ZebraAllScanners”允许不同USB端口上的扫描仪将条形码传输到spring boot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

2 个答案:

此外：