爱普生打印机连接失败状态ERR\U CONN

Question

我有一台爱普生打印机，我使用SDK提供的epos2_printer（示例项目）代码与我的应用程序集成。我复制了相同的代码，但似乎从来没有工作过！

然而，当我将示例项目连接到打印机时，同样的情况也会发生。

private boolean runPrintReceiptSequence() {
    if (!initializeObject()) {
        return false;
    }

    if (!createReceiptData()) {
        finalizeObject();
        return false;
    }

    if (!printData()) {
        finalizeObject();
        return false;
    }

    return true;
}

private boolean initializeObject() {
    try {

        final SpnModelsItem spnModel = new SpnModelsItem("TM-T82 Series", Printer.TM_T82);
        final SpnModelsItem spnLang = new SpnModelsItem("ANK", Printer.MODEL_ANK);

        mPrinter = new Printer(spnModel.getModelConstant(), 
                                spnLang.getModelConstant(), this);
    }
    catch (Exception e) {
        Log.e("Printer", e.toString());
        return false;
    }

    mPrinter.setReceiveEventListener(this);


    return true;
}

private boolean createReceiptData() {
    String method = "";
    Bitmap logoData = BitmapFactory.decodeResource(getResources(), R.drawable.logo_saltnpepper);
    StringBuilder textData = new StringBuilder();
    final int barcodeWidth = 2;
    final int barcodeHeight = 100;
    Date currentDate = new Date();
    info.saltnpepper.ordersmart2.MenuItem currItem = null;

    double price = 0;
    double total = 0;
    int totalQty =0;

    if (mPrinter == null) {
        return false;
    }

    try {
        method = "addTextAlign";
        mPrinter.addTextAlign(Printer.ALIGN_CENTER);

        method = "addImage";
        mPrinter.addImage(logoData, 0, 0,
                          logoData.getWidth(),
                          logoData.getHeight(),
                          Printer.COLOR_1,
                          Printer.MODE_MONO,
                          Printer.HALFTONE_DITHER,
                          Printer.PARAM_DEFAULT,
                          Printer.COMPRESS_AUTO);

        method = "addFeedLine";
        mPrinter.addFeedLine(1);
        textData.append("SALT-N-PEPPER\n");
        //textData.append("STORE DIRECTOR – John Smith\n");
        textData.append("\n");
        textData.append((new SimpleDateFormat("dd/MM/yy HH:mm:ss")).format(currentDate).toString() + "\n");
        //textData.append("ST# 21 OP# 001 TE# 01 TR# 747\n");
        textData.append("------------------------------\n");
        method = "addText";
        mPrinter.addText(textData.toString());
        textData.delete(0, textData.length());
        if(alFinalOrder != null)
        {
            for(int i=0; i < alFinalOrder.size(); i++)
            {
                currItem = alFinalOrder.get(i);
                textData.append(currItem.getName()+"  "+currItem.getQty()+"  "+currItem.getPrice()+"\n");

                //calculate total quantity
                totalQty = totalQty + currItem.getQty();

                //calculate price
                double dPrice = currItem.getQty()*Double.parseDouble(currItem.getPrice().substring(1));
                total = total + dPrice;
                total = Math.round(total*100.0)/100.0;

            }
        }
        textData.append("------------------------------\n");
        method = "addText";
        mPrinter.addText(textData.toString());
        textData.delete(0, textData.length());

        textData.append("TOTAL                   "+"\n");
        textData.append("TAX                     "+"\n");
        method = "addText";
        mPrinter.addText(textData.toString());
        textData.delete(0, textData.length());

mPrinter.add馈线（2）；

        method = "addBarcode";
        mPrinter.addBarcode("01209457",
                            Printer.BARCODE_CODE39,
                            Printer.HRI_BELOW,
                            Printer.FONT_A,
                            barcodeWidth,
                            barcodeHeight);

        method = "addCut";
        mPrinter.addCut(Printer.CUT_FEED);
    }
    catch (Exception e) {
        //ShowMsg.showException(e, method, mContext);
        return false;
    }

    textData = null;

    return true;
}

private boolean printData() {
    if (mPrinter == null) {
        return false;
    }

    if (!connectPrinter()) {
        return false;
    }

    PrinterStatusInfo status = mPrinter.getStatus();

    dispPrinterWarnings(status);

    if (!isPrintable(status)) {
        Log.e("Printer", "Is not printable");
        try {
            mPrinter.disconnect();
        }
        catch (Exception ex) {
            // Do nothing
        }
        return false;
    }

    try {
        mPrinter.sendData(Printer.PARAM_DEFAULT);
    }
    catch (Exception e) {
        Log.e("Printer", e.getMessage());
        try {
            mPrinter.disconnect();
        }
        catch (Exception ex) {
            // Do nothing
        }
        return false;
    }

    return true;
}

private boolean connectPrinter() {
    boolean isBeginTransaction = false;

    if (mPrinter == null) {
        return false;
    }

    try {
        mPrinter.connect("TCP:"+mIP, Printer.PARAM_DEFAULT);
    }
    catch (Epos2Exception e) {
        //ShowMsg.showException(e, "connect", this);
        if(e.getErrorStatus() == Epos2Exception.ERR_CONNECT)
        {
            Log.e("testing", "error connect");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_ALREADY_OPENED)
        {
            Log.e("testing", "already open");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_ALREADY_USED)
        {
            Log.e("testing", "already used");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_BOX_CLIENT_OVER)
        {
            Log.e("testing", "box client over");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_BOX_COUNT_OVER)
        {
            Log.e("testing", "count over");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_DISCONNECT)
        {
            Log.e("testing", "disconnect");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_FAILURE)
        {
            Log.e("testing", "failure");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_ILLEGAL)
        {
            Log.e("testing", "illegal");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_IN_USE)
        {
            Log.e("testing", "in use");
        }
        if(e.getErrorStatus() == Epos2Exception.ERR_MEMORY)
        {
            Log.e("testing", "memory");
        }
        return false;
    }

    try {
        mPrinter.beginTransaction();
        isBeginTransaction = true;
    }
    catch (Exception e) {
        Log.e("Printer", e.toString ());
    }

    if (isBeginTransaction == false) {
        try {
            mPrinter.disconnect();
        }
        catch (Epos2Exception e) {
            // Do nothing
            return false;
        }
    }

    return true;
}

它总是给我例外ERR\u连接打印机。连接内部连接打印机功能。

我做错了什么？

此代码适用于示例应用程序。附注：我已尝试在连接示例应用程序之前连接此应用程序，以检查示例应用程序是否保持连接并且不允许其他应用程序连接，但事实并非如此。Epson帮助无法提供任何进一步的帮助。

我的AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="xyz"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="21"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".MenuActivity" >
    </activity>
    <activity
        android:name=".SaltnPepperActivity"
        android:label="@string/title_activity_saltn_pepper" >
    </activity>
            <activity
        android:name=".FinalOrder"
         ></activity>
                <activity
        android:name=".ZinVietActivity"
         >
    </activity>
     <activity
        android:name="com.epson.epos2_printer.DiscoverActivity"
         ></activity>

</application>

Answer 1

状态ERR_CONN基本上是显示设备无法到达或与设备连接失败。它可以是USB、LAN/NETWORK、蓝牙连接失败状态。

如果您试图将打印机与蓝牙连接，则必须写入以下权限：

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

如果您使用LAN进行网络打印机，则

<uses-permission android:name="android.permission.INTERNET"/>

对于USB打印机连接，请使用：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

在使用EPOS2示例项目时，请记住导入Jar文件“EPOS2.Jar”。单击此处下载文件。

Answer 2

我怀疑连接打印机的方法中似乎有错误。我曾经使用过这个SDK，所以最好正确地遵循文档（意味着不要跳过步骤）。确保您已经定义了SDK中提到的权限。

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>


<activity android:name=".MainActivity" android:label="@string/app_title"  android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"/>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/device_filter"/>

正如我所见，您没有提到您正在建立的连接类型，因此，在这种情况下，在选择目标时一定存在问题

从SDK中查看函数：

Public void connect（String target，int timeout）抛出Epos2Exception；

您可能使用了错误的目标参数。

注意：如果您使用USB或任何其他模式，请确保按照文档运行可发现性服务。

 Discovery.start(this, mFilterOption, mDiscoveryListener);

它将返回所需的目标名称。我确信不会发生连接故障。祝你好运

Answer 3

看起来你在清单中没有适当的权限。尝试将这些内容放在项目的清单标签下：

<代码>

<代码>

<代码>

<代码>

他们也有

<代码>

允许，但我不确定你需要它。我认为最重要的是蓝牙和互联网权限。