無法使用Zbar庫在GS1 128條碼的第一個位置讀取FNC1字符？

Question

我已經開發了一個應用程序在android中使用谷歌視覺圖書館GS1數據矩陣和Zbar圖書館GS1 128條碼無法讀取使用Zbar圖書館GS1 128條碼第一個位置的FNC1字符。

Zbar庫無法在條碼開始時顯示任何FNC1字符的符號！

任何解決方案。 。 。 。

即時幫助是明顯的。 。 。

下面是我zbar和掃描儀活動

@SuppressWarnings("deprecation") 
public class ZBarFirstScannerActivity extends AppCompatActivity{ 

//TextView tv; 
ImageView iv; 
LinearLayout ll; 
private Camera mCamera; 
private CameraPreview mPreview; 
private Handler autoFocusHandler; 
private ImageScanner scanner; 
private boolean barcodeScanned = false; 
private boolean previewing = true; 
TextView tv; 

static { 
    System.loadLibrary("iconv"); 
} 
static { 
    System.loadLibrary("zbarjni"); 
} 



public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 



    setContentView(R.layout.barcode_capture1d); 


    tv = (TextView) findViewById(R.id.textVertical); 
    tv.setRotation(90); 

    initToolbar(); 


    autoFocusHandler = new Handler(); 
    mCamera = getCameraInstance(); 
    // Instance barcode scanner 

    scanner = new ImageScanner(); 
    scanner.setConfig(0, Config.X_DENSITY, 1); 
    scanner.setConfig(0, Config.Y_DENSITY, 1); 
    scanner.setConfig(Symbol.CODE128, Config.ENABLE,1); 
    scanner.setConfig(Symbol.EAN13, Config.ENABLE,1); 

    mPreview = new CameraPreview(this, mCamera, previewCb, autoFocusCB); 
    FrameLayout preview = (FrameLayout)findViewById(R.id.cameraPreview); 
    preview.addView(mPreview); 


} 

private void initToolbar() { 

    final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    final ActionBar actionBar = getSupportActionBar(); 

    if (actionBar != null) { 


     actionBar.setHomeButtonEnabled(true); 
     actionBar.setHomeAsUpIndicator(ContextCompat.getDrawable(this, R.drawable.abc_ic_ab_back_mtrl_am_alpha)); 

     actionBar.setDisplayHomeAsUpEnabled(true); 
    } 
} 
/** A safe way to get an instance of the Camera object. */ 
public static Camera getCameraInstance() 
{ 
    Camera c = null; 
    try 
    { 
     c = Camera.open(); 
    } catch (Exception e) 
    { 
     //nada 
    } 
    return c; 
} 

private void releaseCamera() 
{ 
    if (mCamera != null) 
    { 
     previewing = false; 
     mCamera.setPreviewCallback(null); 
     mCamera.release(); 
     mCamera = null; 
    } 
} 

PreviewCallback previewCb = new PreviewCallback() 
{ 
    public void onPreviewFrame(byte[] data, Camera camera) 
    { 
     Camera.Parameters parameters = camera.getParameters(); 
     Size size = parameters.getPreviewSize(); 

     Image barcode = new Image(size.width, size.height, "Y800"); 
     barcode.setData(data); 

     int result = scanner.scanImage(barcode); 
     if (result != 0) 
     { 
      previewing = false; 
      mCamera.setPreviewCallback(null); 
      mCamera.stopPreview(); 
      SymbolSet syms = scanner.getResults(); 
      for (Symbol sym : syms) 
      { 
       barcodeScanned = true; 

       Intent returnIntent = new Intent(); 
       returnIntent.putExtra("BARCODE", sym.getData()); 
       setResult(MainActivity.BAR_CODE_TYPE_128,returnIntent); 
       releaseCamera(); 
       finish(); 
       break; 
      } 
     } 
    } 
}; 

// Mimic continuous auto-focusing 
AutoFocusCallback autoFocusCB = new AutoFocusCallback() 
{ 
    public void onAutoFocus(boolean success, Camera camera) 
    { 
     autoFocusHandler.postDelayed(doAutoFocus, 3000); 
    } 
}; 

private Runnable doAutoFocus = new Runnable() 
{ 
    public void run() 
    { 
     if (previewing) 
      mCamera.autoFocus(autoFocusCB); 
    } 
}; 

public void onPause() { 
    super.onPause(); 
    releaseCamera(); 
} 

public void onResume(){ 
    super.onResume(); 
    new ZBarFirstScannerActivity(); 

} 

@Override 
public void onBackPressed() { 

    releaseCamera(); 

    finish(); 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    int id = item.getItemId(); 

    if (id == android.R.id.home) { 
     onBackPressed(); 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 
} 

下面是我的谷歌掃描活動

public final class GoogleScannerActivity extends AppCompatActivity { 
private static final String TAG = "Barcode-reader"; 

// intent request code to handle updating play services if needed. 
private static final int RC_HANDLE_GMS = 9001; 

// permission request codes need to be < 256 
private static final int RC_HANDLE_CAMERA_PERM = 2; 

// constants used to pass extra data in the intent 
public static final String AutoFocus = "AutoFocus"; 
public static final String UseFlash = "UseFlash"; 
public static final String BarcodeObject = "Barcode"; 
Bitmap bmp; 
FileOutputStream fos = null; 
private Camera c; 

Switch aSwitch; 
private CameraSource mCameraSource; 
private CameraSourcePreview mPreview; 
private GraphicOverlay<BarcodeGraphic> mGraphicOverlay; 

// helper objects for detecting taps and pinches. 
private ScaleGestureDetector scaleGestureDetector; 
private GestureDetector gestureDetector; 

/** 
* Initializes the UI and creates the detector pipeline. 
*/ 
@Override 
public void onCreate(Bundle icicle) { 
    super.onCreate(icicle); 
    setContentView(R.layout.barcode_capture2d); 
    initToolbar(); 

    ActivitySource.caller = this; 
    mPreview = (CameraSourcePreview) findViewById(R.id.preview); 
    mGraphicOverlay = (GraphicOverlay<BarcodeGraphic>) findViewById(R.id.graphicOverlay); 

    boolean autoFocus = true; 
    boolean useFlash = false; 

    // Check for the camera permission before accessing the camera. If the 
    // permission is not granted yet, request permission. 
    int rc = ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA); 
    if (rc == PackageManager.PERMISSION_GRANTED) { 
     createCameraSource(autoFocus, useFlash); 
    } else { 
     requestCameraPermission(); 
    } 

    gestureDetector = new GestureDetector(this, new CaptureGestureListener()); 
    scaleGestureDetector = new ScaleGestureDetector(this, new ScaleListener()); 

    /*Snackbar.make(mGraphicOverlay, "Tap to capture. Pinch/Stretch to zoom", 
      Snackbar.LENGTH_LONG) 
      .show();*/ 
} 

private void initToolbar() { 

    final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    final ActionBar actionBar = getSupportActionBar(); 

    if (actionBar != null) { 


     actionBar.setHomeButtonEnabled(true); 
     actionBar.setHomeAsUpIndicator(ContextCompat.getDrawable(this, R.drawable.abc_ic_ab_back_mtrl_am_alpha)); 

     actionBar.setDisplayHomeAsUpEnabled(true); 
    } 
} 

private Camera.Size getBestPreviewSize(int width, int height, Camera.Parameters parameters){ 
    Camera.Size bestSize = null; 
    List<Camera.Size> sizeList = parameters.getSupportedPreviewSizes(); 

    bestSize = sizeList.get(0); 

    for(int i = 1; i < sizeList.size(); i++){ 
     if((sizeList.get(i).width * sizeList.get(i).height) > 
       (bestSize.width * bestSize.height)){ 
      bestSize = sizeList.get(i); 
     } 
    } 
    return bestSize; 
} 
/** 
* Handles the requesting of the camera permission. This includes 
* showing a "Snackbar" message of why the permission is needed then 
* sending the request. 
*/ 
private void requestCameraPermission() { 
    Log.w(TAG, "Camera permission is not granted. Requesting permission"); 

    final String[] permissions = new String[]{Manifest.permission.CAMERA}; 

    if (!ActivityCompat.shouldShowRequestPermissionRationale(this, 
      Manifest.permission.CAMERA)) { 
     ActivityCompat.requestPermissions(this, permissions, RC_HANDLE_CAMERA_PERM); 
     return; 
    } 

    final Activity thisActivity = this; 

    View.OnClickListener listener = new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      ActivityCompat.requestPermissions(thisActivity, permissions, 
        RC_HANDLE_CAMERA_PERM); 
     } 
    }; 

    Snackbar.make(mGraphicOverlay, R.string.permission_camera_rationale, 
      Snackbar.LENGTH_INDEFINITE) 
      .setAction(R.string.ok, listener) 
      .show(); 
} 

@Override 
public boolean onTouchEvent(MotionEvent e) { 
    boolean b = scaleGestureDetector.onTouchEvent(e); 

    boolean c = gestureDetector.onTouchEvent(e); 

    return b || c || super.onTouchEvent(e); 
} 

/** 
* Creates and starts the camera. Note that this uses a higher resolution in comparison 
* to other detection examples to enable the barcode detector to detect small barcodes 
* at long distances. 
* 
* Suppressing InlinedApi since there is a check that the minimum version is met before using 
* the constant. 
*/ 
@SuppressLint("InlinedApi") 
private void createCameraSource(boolean autoFocus, boolean useFlash) { 
    Context context = getApplicationContext(); 

    // A barcode detector is created to track barcodes. An associated multi-processor instance 
    // is set to receive the barcode detection results, track the barcodes, and maintain 
    // graphics for each barcode on screen. The factory is used by the multi-processor to 
    // create a separate tracker instance for each barcode. 

    BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(context).setBarcodeFormats(Barcode.CODE_128 | Barcode.DATA_MATRIX | Barcode.QR_CODE).build(); 
    BarcodeTrackerFactory barcodeFactory = new BarcodeTrackerFactory(mGraphicOverlay); 
    barcodeDetector.setProcessor(
      new MultiProcessor.Builder<>(barcodeFactory).build()); 

    if (!barcodeDetector.isOperational()) { 
     // Note: The first time that an app using the barcode or face API is installed on a 
     // device, GMS will download a native libraries to the device in order to do detection. 
     // Usually this completes before the app is run for the first time. But if that 
     // download has not yet completed, then the above call will not detect any barcodes 
     // and/or faces. 
     // 
     // isOperational() can be used to check if the required native libraries are currently 
     // available. The detectors will automatically become operational once the library 
     // downloads complete on device. 
     Log.w(TAG, "Detector dependencies are not yet available."); 

     // Check for low storage. If there is low storage, the native library will not be 
     // downloaded, so detection will not become operational. 
     IntentFilter lowstorageFilter = new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW); 
     boolean hasLowStorage = registerReceiver(null, lowstorageFilter) != null; 

     if (hasLowStorage) { 
      Toast.makeText(this, R.string.low_storage_error, Toast.LENGTH_LONG).show(); 
      Log.w(TAG, getString(R.string.low_storage_error)); 
     } 
    } 

    // Creates and starts the camera. Note that this uses a higher resolution in comparison 
    // to other detection examples to enable the barcode detector to detect small barcodes 
    // at long distances. 
    CameraSource.Builder builder = new CameraSource.Builder(getApplicationContext(), barcodeDetector) 
      .setFacing(CameraSource.CAMERA_FACING_BACK) 
      .setRequestedPreviewSize(1100, 844) 
      .setRequestedFps(15.0f); 
    // make sure that auto focus is an available option 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { 
     builder = builder.setFocusMode(
       autoFocus ? Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE : null); 
    } 

    mCameraSource = builder 
      .setFlashMode(useFlash ? Camera.Parameters.FLASH_MODE_TORCH : null) 
      .build(); 
} 


/** 
* Restarts the camera. 
*/ 
@Override 
protected void onResume() { 
    super.onResume(); 
    startCameraSource(); 
} 

/** 
* Stops the camera. 
*/ 
@Override 
protected void onPause() { 
    super.onPause(); 
    if (mPreview != null) { 
     mPreview.stop(); 
    } 
} 

/** 
* Releases the resources associated with the camera source, the associated detectors, and the 
* rest of the processing pipeline. 
*/ 
@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    if (mPreview != null) { 
     mPreview.release(); 
    } 
} 


@Override 
public void onRequestPermissionsResult(int requestCode, 
             @NonNull String[] permissions, 
             @NonNull int[] grantResults) { 
    if (requestCode != RC_HANDLE_CAMERA_PERM) { 
     Log.d(TAG, "Got unexpected permission result: " + requestCode); 
     super.onRequestPermissionsResult(requestCode, permissions, grantResults); 
     return; 
    } 

    if (grantResults.length != 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 
     Log.d(TAG, "Camera permission granted - initialize the camera source"); 
     // we have permission, so create the camerasource 
     boolean autoFocus = getIntent().getBooleanExtra(AutoFocus,false); 
     boolean useFlash = getIntent().getBooleanExtra(UseFlash, false); 
     createCameraSource(autoFocus, useFlash); 
     return; 
    } 

    Log.e(TAG, "Permission not granted: results len = " + grantResults.length + 
      " Result code = " + (grantResults.length > 0 ? grantResults[0] : "(empty)")); 

    DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int id) { 
      finish(); 
     } 
    }; 

    AlertDialog.Builder builder = new AlertDialog.Builder(this); 
    builder.setTitle("Multitracker sample") 
      .setMessage(R.string.no_camera_permission) 
      .setPositiveButton(R.string.ok, listener) 
      .show(); 
} 

/** 
* Starts or restarts the camera source, if it exists. If the camera source doesn't exist yet 
* (e.g., because onResume was called before the camera source was created), this will be called 
* again when the camera source is created. 
*/ 
private void startCameraSource() throws SecurityException { 
    // check that the device has play services available. 
    int code = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(
      getApplicationContext()); 
    if (code != ConnectionResult.SUCCESS) { 
     Dialog dlg = 
       GoogleApiAvailability.getInstance().getErrorDialog(this, code, RC_HANDLE_GMS); 
     dlg.show(); 
    } 

    if (mCameraSource != null) { 
     try { 
      mPreview.start(mCameraSource, mGraphicOverlay); 
     } catch (IOException e) { 
      Log.e(TAG, "Unable to start camera source.", e); 
      mCameraSource.release(); 
      mCameraSource = null; 
     } 
    } 
} 

/** 
* onTap is called to capture the oldest barcode currently detected and 
* return it to the caller. 
* 
* @param rawX - the raw position of the tap 
* @param rawY - the raw position of the tap. 
* @return true if the activity is ending. 
*/ 

private boolean onTap(float rawX, float rawY) { 
    //TODO: use the tap position to select the barcode. 
    BarcodeGraphic graphic = mGraphicOverlay.getFirstGraphic(); 
    Barcode barcode = null; 
    if (graphic != null) { 
     barcode = graphic.getBarcode(); 
     if (barcode != null) { 
      Intent data = new Intent(); 
      data.putExtra(BarcodeObject, barcode); 
      setResult(CommonStatusCodes.SUCCESS, data); 
      finish(); 
     } 
     else { 
      Log.d(TAG, "barcode data is null"); 
     } 
    } 
    else { 
     Log.d(TAG,"no barcode detected"); 
    } 
    return barcode != null; 
} 

private class CaptureGestureListener extends GestureDetector.SimpleOnGestureListener { 

    @Override 
    public boolean onSingleTapConfirmed(MotionEvent e) { 

     return onTap(e.getRawX(), e.getRawY()) || super.onSingleTapConfirmed(e); 
    } 
} 

private class ScaleListener implements ScaleGestureDetector.OnScaleGestureListener { 

    /** 
    * Responds to scaling events for a gesture in progress. 
    * Reported by pointer motion. 
    * 
    * @param detector The detector reporting the event - use this to 
    *     retrieve extended info about event state. 
    * @return Whether or not the detector should consider this event 
    * as handled. If an event was not handled, the detector 
    * will continue to accumulate movement until an event is 
    * handled. This can be useful if an application, for example, 
    * only wants to update scaling factors if the change is 
    * greater than 0.01. 
    */ 
    @Override 
    public boolean onScale(ScaleGestureDetector detector) { 
     return false; 
    } 

    /** 
    * Responds to the beginning of a scaling gesture. Reported by 
    * new pointers going down. 
    * 
    * @param detector The detector reporting the event - use this to 
    *     retrieve extended info about event state. 
    * @return Whether or not the detector should continue recognizing 
    * this gesture. For example, if a gesture is beginning 
    * with a focal point outside of a region where it makes 
    * sense, onScaleBegin() may return false to ignore the 
    * rest of the gesture. 
    */ 
    @Override 
    public boolean onScaleBegin(ScaleGestureDetector detector) { 
     return true; 
    } 

    /** 
    * Responds to the end of a scale gesture. Reported by existing 
    * pointers going up. 
    * <p/> 
    * Once a scale has ended, {@link ScaleGestureDetector#getFocusX()} 
    * and {@link ScaleGestureDetector#getFocusY()} will return focal point 
    * of the pointers remaining on the screen. 
    * 
    * @param detector The detector reporting the event - use this to 
    *     retrieve extended info about event state. 
    */ 
    @Override 
    public void onScaleEnd(ScaleGestureDetector detector) { 
     mCameraSource.doZoom(detector.getScaleFactor()); 
    } 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    int id = item.getItemId(); 

    if (id == android.R.id.home) { 
     onBackPressed(); 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 
} 

Answer 1

當掃描GS1-128符號在第一位置FNC1作爲一個標誌字符指示存在GS1應用標識符標準格式數據，故意從掃描數據中省略，而任何字段間FNC1格式字符在GS（ASCII 29）處傳輸。

如果您的閱讀器配置爲在掃描數據開始時發出符號系統標識符，則可以推斷隱式的領先FNC1。在這種情況下，你GS1-128掃描數據將與]C1而不是]C0開始爲通用代碼128

不幸的是它不會出現好像無論是zbar和庫或谷歌視覺庫是可以被配置爲返回符號標識符令人失望的限制。 此外，Google Vision Library錯誤地返回了表示第一個位置的FNC1的領先GS1。

讀取GS1格式的數據詳細描述於this answer。

具體地，ISO/IEC 15417 - 碼128條形碼符號規範表示：

「的任何其利用代碼 128個符號與FNC1在第一或第二數據的位置的應用程序應 需要符號的傳輸當在第一個或第二個位置使用FNC1時，雖然它的存在是 ，分別使用 符號系統標識符中的修飾符值1或2表示，但在第一個或第二個位置使用FNC1時，它不應爲 。