画像の印刷を試みていますが、これまでのところ成功していません。
プリンタはローカルで製造された 2 インチのサーマル プリンタで、印刷解像度は 8 ドット/mm、384 ドット/ライン、203 dpi です。
プリンタは、メモリ フラッシュ サイズが 512 の「NXP 2388 ARM v7 Microproc」を搭載したボードに基づいています。 KB、RAM: 128 KB & 受信バッファ サイズ 16KB.
私は今までこの質問
に従いました。
問題:印刷しようとした画像の解像度は 576x95 です。
画像は印刷されました (いくつかのエラー LED が点灯し、ブザー ノイズをデバッグします:D) が、画像の向きは水平に印刷されるのではなく垂直でした。それもページの一番左側と画像の上部が切り取られていました
ここで、私が持っているプリンターと互換性のあるいくつかのフラグを (「パケット」を作成しながら) 渡さなかったと仮定します。
私は以前にBluetooth印刷に取り組んだことがないので、どんな助けもかなりのものです:)
私の既存の主な活動:
public class MainActivity extends Activity
{
// will show the statuses
TextView myLabel;
// will enable user to enter any text to be printed
EditText myTextbox;
EditText devName;
public TableLayout tl2;
String devid;
String[] pName;
String[] LODQTY;
String[] rte;
String[] stk;
String[] oQty;
String[] oVal;
String[] fQty;
BitSet dots;
int mWidth;
int mHeight;
String mStatus;
String TAG = "TAG";
public String msg;
// android built in classes for bluetooth operations
BluetoothAdapter mBluetoothAdapter;
BluetoothSocket mmSocket;
BluetoothDevice mmDevice;
OutputStream mmOutputStream;
InputStream mmInputStream;
Thread workerThread;
byte[] readBuffer;
int readBufferPosition;
int counter;
volatile boolean stopWorker;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
devName = (EditText) findViewById(R.id.etdevice);
devName.setText("BTprinter0377");
String[] product_info = new String[6];
product_info[0] = "CPL400^10^1^0^4^0.4^0";
product_info[1] = "CPL400^10^1^0^4^0.4^0";
product_info[2] = "CPL400^10^1^0^4^0.4^0";
product_info[3] = "CPL400^10^1^0^4^0.4^0";
product_info[4] = "CPL400^10^1^0^4^0.4^0";
product_info[5] = "CPL400^10^1^0^4^0.4^0";
tl2 = (TableLayout) findViewById(R.id.dynSummary);
LayoutInflater inflater = getLayoutInflater();
for (int current = 0; current <= (product_info.length - 1); current++) {
final TableRow row = (TableRow)inflater.inflate(R.layout.table_summary_row, tl2 , false);
TextView tv1 = (TextView)row.findViewById(R.id.tvSkuName);
TextView tv2 = (TextView)row.findViewById(R.id.tvOrderQty);
TextView tv3 = (TextView)row.findViewById(R.id.tvFreeQty);
TextView tv4 = (TextView)row.findViewById(R.id.tvSampleQty);
TextView tv5 = (TextView)row.findViewById(R.id.tvTotalOrderKg);
TextView tv6 = (TextView)row.findViewById(R.id.tvTotalFreeKg);
TextView tv7 = (TextView)row.findViewById(R.id.tvTotalSampleKg);
StringTokenizer tokens = new StringTokenizer(String.valueOf(product_info[current]), "^");
//System.out.println("tokens.nextToken().trim()"+tokens.nextToken().trim());
tv1.setText(tokens.nextToken().trim());
tv2.setText(tokens.nextToken().trim());
tv3.setText(tokens.nextToken().trim());
tv4.setText(tokens.nextToken().trim());
tv5.setText(tokens.nextToken().trim());
tv6.setText(tokens.nextToken().trim());
tv7.setText(tokens.nextToken().trim());
tl2.addView(row);
}
try {
// we have three buttons for specific functions
Button openButton = (Button) findViewById(R.id.open);
Button sendButton = (Button) findViewById(R.id.send);
Button closeButton = (Button) findViewById(R.id.close);
myLabel = (TextView) findViewById(R.id.label);
// open bluetooth connection
openButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
devid = devName.getText().toString().trim();
try {
findBT();
openBT();
} catch (IOException ex) {
}
}
});
// send data typed by the user to be printed
sendButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
sendData();
} catch (IOException ex) {
}
}
});
// close bluetooth connection
closeButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
closeBT();
} catch (IOException ex) {
}
}
});
} catch (NullPointerException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* This will find a bluetooth printer device
*/
void findBT() {
try {
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
myLabel.setText("No bluetooth adapter available");
}
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBluetooth = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetooth, 0);
}
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
.getBondedDevices();
if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
System.out.println("device.getName(): "+device.getName().toString());
if (device.getName().equals("BTprinter0377")) {
mmDevice = device;
break;
}
}
}
myLabel.setText("Bluetooth Device Found");
} catch (NullPointerException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* Tries to open a connection to the bluetooth printer device
*/
void openBT() throws IOException {
try {
// Standard SerialPortService ID
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
mmSocket.connect();
mmOutputStream = mmSocket.getOutputStream();
mmInputStream = mmSocket.getInputStream();
beginListenForData();
myLabel.setText("Bluetooth Opened");
} catch (NullPointerException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* After opening a connection to bluetooth printer device,
* we have to listen and check if a data were sent to be printed.
*/
void beginListenForData() {
try {
final Handler handler = new Handler();
// This is the ASCII code for a newline character
final byte delimiter = 10;
stopWorker = false;
readBufferPosition = 0;
readBuffer = new byte[1024];
workerThread = new Thread(new Runnable() {
public void run() {
while (!Thread.currentThread().isInterrupted()
&& !stopWorker) {
try {
int bytesAvailable = mmInputStream.available();
if (bytesAvailable > 0) {
byte[] packetBytes = new byte[bytesAvailable];
mmInputStream.read(packetBytes);
for (int i = 0; i < bytesAvailable; i++) {
byte b = packetBytes[i];
if (b == delimiter) {
byte[] encodedBytes = new byte[readBufferPosition];
System.arraycopy(readBuffer, 0,
encodedBytes, 0,
encodedBytes.length);
final String data = new String(
encodedBytes, "US-ASCII");
readBufferPosition = 0;
handler.post(new Runnable() {
public void run() {
myLabel.setText(data);
}
});
} else {
readBuffer[readBufferPosition++] = b;
}
}
}
} catch (IOException ex) {
stopWorker = true;
}
}
}
});
workerThread.start();
} catch (NullPointerException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* This will send data to be printed by the bluetooth printer
*/
void sendData() throws IOException {
System.out.println("tl2.getChildCount(): "+tl2.getChildCount());
try {
print_image("/sdcard/tryimg.png");
String msg22;
msg22 = "\n";
msg22 += "PN Or Fr Sa TOKg TFKg TSKg";
msg22 += "\n";
//mmOutputStream.write(msg22.getBytes());
// tell the user data were sent
myLabel.setText("Data Sent");
} catch (NullPointerException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* Close the connection to bluetooth printer.
*/
void closeBT() throws IOException {
try {
stopWorker = true;
mmOutputStream.close();
mmInputStream.close();
mmSocket.close();
myLabel.setText("Bluetooth Closed");
} catch (NullPointerException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
public String convertBitmap(Bitmap inputBitmap) {
mWidth = inputBitmap.getWidth();
mHeight = inputBitmap.getHeight();
convertArgbToGrayscale(inputBitmap, mWidth, mHeight);
mStatus = "ok";
return mStatus;
}
private void convertArgbToGrayscale(Bitmap bmpOriginal, int width,
int height) {
int pixel;
int k = 0;
int B = 0, G = 0, R = 0;
dots = new BitSet();
try {
for (int x = 0; x < height; x++) {
for (int y = 0; y < width; y++) {
// get one pixel color
pixel = bmpOriginal.getPixel(y, x);
// retrieve color of all channels
R = Color.red(pixel);
G = Color.green(pixel);
B = Color.blue(pixel);
// take conversion up to one single value by calculating
// pixel intensity.
R = G = B = (int) (0.299 * R + 0.587 * G + 0.114 * B);
// set bit into bitset, by calculating the pixel's luma
if (R < 55) {
dots.set(k);//this is the bitset that i'm printing
}
k++;
}
}
} catch (Exception e) {
// TODO: handle exception
Log.e(TAG, e.toString());
}
}
private void print_image(String file) throws IOException {
File fl = new File(file);
if (fl.exists()) {
Bitmap bmp = BitmapFactory.decodeFile(file);
convertBitmap(bmp);
mmOutputStream.write(PrinterCommands.SET_LINE_SPACING_24);
int offset = 0;
while (offset < bmp.getHeight()) {
mmOutputStream.write(PrinterCommands.SELECT_BIT_IMAGE_MODE);
for (int x = 0; x < bmp.getWidth(); ++x) {
for (int k = 0; k < 3; ++k) {
byte slice = 0;
for (int b = 0; b < 8; ++b) {
int y = (((offset / 8) + k) * 8) + b;
int i = (y * bmp.getWidth()) + x;
boolean v = false;
if (i < dots.length()) {
v = dots.get(i);
}
slice |= (byte) ((v ? 1 : 0) << (7 - b));
}
mmOutputStream.write(slice);
}
}
offset += 24;
mmOutputStream.write(PrinterCommands.FEED_LINE);
mmOutputStream.write(PrinterCommands.FEED_LINE);
mmOutputStream.write(PrinterCommands.FEED_LINE);
mmOutputStream.write(PrinterCommands.FEED_LINE);
mmOutputStream.write(PrinterCommands.FEED_LINE);
mmOutputStream.write(PrinterCommands.FEED_LINE);
}
mmOutputStream.write(PrinterCommands.SET_LINE_SPACING_30);
} else {
Toast.makeText(this, "file doesn't exists", Toast.LENGTH_SHORT).show();
}
}
}
PrinterCommands クラス:
public class PrinterCommands {
public static final byte[] INIT = {27, 64};
public static byte[] FEED_LINE = {10};
public static byte[] SELECT_FONT_A = {27, 33, 0};
public static byte[] SET_BAR_CODE_HEIGHT = {29, 104, 100};
public static byte[] PRINT_BAR_CODE_1 = {29, 107, 2};
public static byte[] SEND_NULL_BYTE = {0x00};
public static byte[] SELECT_PRINT_SHEET = {0x1B, 0x63, 0x30, 0x02};
public static byte[] FEED_PAPER_AND_CUT = {0x1D, 0x56, 66, 0x00};
public static byte[] SELECT_CYRILLIC_CHARACTER_CODE_TABLE = {0x1B, 0x74, 0x11};
public static byte[] SELECT_BIT_IMAGE_MODE = {0x1B, 0x2A, 33, (byte) 255, 3};
//public static byte[] SELECT_BIT_IMAGE_MODE = {0x1B, 0x2A, 0x64, 0x63, 48, (byte) 255};
public static byte[] SET_LINE_SPACING_24 = {0x1B, 0x33, 24};
public static byte[] SET_LINE_SPACING_30 = {0x1B, 0x33, 30};
public static byte[] TRANSMIT_DLE_PRINTER_STATUS = {0x10, 0x04, 0x01};
public static byte[] TRANSMIT_DLE_OFFLINE_PRINTER_STATUS = {0x10, 0x04, 0x02};
public static byte[] TRANSMIT_DLE_ERROR_STATUS = {0x10, 0x04, 0x03};
public static byte[] TRANSMIT_DLE_ROLL_PAPER_SENSOR_STATUS = {0x10, 0x04, 0x04};
}
プリンターの開発マニュアル（pdf）に記載されているように：
Bit Map Image Print
1. Select the image either from PC or from mobile's SD card.
2. Convert the image into monochrome bmp.
3. Resize the image to fit into the printer paper area if it is exceeding
4. Now read the processed image through fileinputstream and save it into byte array.
5. Make the packet of image and then send it to printer over outputstream.
必要なパケット構造:
パケット フィールド チャート:
アライメント表とその他の情報:
