i already able to print text using kotlin to thermal printer, but im still dont know how to print image to thermal printer in kotlin. please give me sample printing image to thermal printer in kotlin.i already search for the topics, but it written in java, i doesnt know java very much thanks for the help
private fun p1() {
val namaToko = "Rose Medical"
val alamatToko = "Pramuka raya no.1 Jakarta Timur"
val telp = "021-85901642"
val enter = "\n"
val strip = "-"
val rp ="Rp."
val ex = " X "
val textTotal = "Total Rp:"
val ppnTv = "PPN :Rp."
val chargeTv ="Charge :Rp."
val totalTv = "Total Belanja :Rp."
val scope = CoroutineScope(Dispatchers.IO)
scope.launch {
// chunks1
try{
writeWithFormat(namaToko.toByteArray(),Formatter().get(),Formatter.centerAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(alamatToko.toByteArray(),Formatter().get(),Formatter.centerAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(telp.toByteArray(),Formatter().get(),Formatter.centerAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
}catch (e: Exception) {
Log.e("PrintActivity", "Exe ", e)
}
// chunks2
for(pointer in salesBody.indices){
try {
val merk = salesBody[pointer].merk
writeWithFormat(merk!!.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(strip.toByteArray(),Formatter().get(),Formatter.leftAlign())
val barang = salesBody[pointer].namaBrg
writeWithFormat(barang!!.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
val varian = salesBody[pointer].varian
writeWithFormat(varian!!.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(rp.toByteArray(),Formatter().get(),Formatter.leftAlign())
val harga = ValidNumber().deciformat(salesBody[pointer].hargaJual.toString())
writeWithFormat(harga.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(ex.toByteArray(),Formatter().get(),Formatter.leftAlign())
val jumlah = ValidNumber().deciformat(salesBody[pointer].qty.toString())
writeWithFormat(jumlah.toByteArray(),Formatter().get(),Formatter.leftAlign())
val satuan = salesBody[pointer].unit
writeWithFormat(satuan!!.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(textTotal.toByteArray(),Formatter().get(),Formatter.rightAlign())
val total = ValidNumber().deciformat(salesBody[pointer].total.toString())
writeWithFormat(total.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
}catch (e: Exception) {
Log.e("PrintActivity", "Exe ", e)
}
}
// chunks3
try{
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
val tanggal = salesHeader[0].tanggal
writeWithFormat(tanggal!!.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(strip.toByteArray(),Formatter().get(),Formatter.leftAlign())
val jam = salesHeader[0].jam
writeWithFormat(jam!!.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(strip.toByteArray(),Formatter().get(),Formatter.leftAlign())
val idTag= salesHeader[0].idTag
writeWithFormat(idTag!!.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
val payment= salesHeader[0].payment
writeWithFormat(payment!!.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.leftAlign())
writeWithFormat(ppnTv.toByteArray(),Formatter().get(),Formatter.rightAlign())
val ppnValue = ValidNumber().deciformat(salesHeader[0].ppn.toString())
writeWithFormat(ppnValue.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(chargeTv.toByteArray(),Formatter().get(),Formatter.rightAlign())
val chargeValue = ValidNumber().deciformat(salesHeader[0].charge.toString())
writeWithFormat(chargeValue.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(totalTv.toByteArray(),Formatter().get(),Formatter.rightAlign())
var totalValue = ValidNumber().deciformat(salesHeader[0].allTotal.toString())
writeWithFormat(totalValue.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
writeWithFormat(enter.toByteArray(),Formatter().get(),Formatter.rightAlign())
}catch (e: Exception) {
Log.e("PrintActivity", "Exe ", e)
}
}
}
//print code
class Formatter {
/** The format that is being build on */
private val mFormat: ByteArray
init {
// Default:
mFormat = byteArrayOf(27, 33, 0)
}
/**
* Method to get the Build result
*
* #return the format
*/
fun get(): ByteArray {
return mFormat
}
fun bold(): Formatter {
// Apply bold:
mFormat[2] = (0x8 or mFormat[2].toInt()).toByte()
return this
}
fun small(): Formatter {
mFormat[2] = (0x1 or mFormat[2].toInt()).toByte()
return this
}
fun height(): Formatter {
mFormat[2] = (0x10 or mFormat[2].toInt()).toByte()
return this
}
fun width(): Formatter {
mFormat[2] = (0x20 or mFormat[2].toInt()).toByte()
return this
}
fun underlined(): Formatter {
mFormat[2] = (0x80 or mFormat[2].toInt()).toByte()
return this
}
companion object {
fun rightAlign(): ByteArray {
return byteArrayOf(0x1B, 'a'.code.toByte(), 0x02)
}
fun leftAlign(): ByteArray {
return byteArrayOf(0x1B, 'a'.code.toByte(), 0x00)
}
fun centerAlign(): ByteArray {
return byteArrayOf(0x1B, 'a'.code.toByte(), 0x01)
}
}
}//last
fun writeWithFormat(buffer: ByteArray, pFormat: ByteArray?, pAlignment: ByteArray?): Boolean {
val mmOutStream: OutputStream = mBluetoothSocket.outputStream
return try {
// Notify printer it should be printed with given alignment:
mmOutStream.write(pAlignment)
// Notify printer it should be printed in the given format:
mmOutStream.write(pFormat)
// Write the actual data:
mmOutStream.write(buffer, 0, buffer.size)
// Share the sent message back to the UI Activity
//App.getInstance().getHandler().obtainMessage(MESSAGE_WRITE, buffer.size, -1, buffer).sendToTarget()
true
} catch (e: IOException) {
Log.e(TAG, "Exception during write", e)
false
}
}
//print code close
Using Thermal Printer repo references, I managed to print image to Bluetooth thermal printer. Make sure to use a proper black and white image to print.
Here is the piece of code I used to make a java class
--BitmapHelper.java.
public class BitmapHelper {
private static String[] binaryArray = { "0000", "0001", "0010", "0011",
"0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011",
"1100", "1101", "1110", "1111" };
public static byte[] decodeBitmap(Bitmap bmp){
//Bitmap bmp = Bitmap.createScaledBitmap(bitmap, 50, 50, false);
int maxWidth = 350;
int bmpWidth = bmp.getWidth();
int bmpHeight = bmp.getHeight();
if(bmpWidth > maxWidth){
float aspectRatio = bmp.getWidth() /
(float) bmp.getHeight();
bmpWidth = maxWidth;
bmpHeight = Math.round(bmpWidth / aspectRatio);
bmp = Bitmap.createScaledBitmap(bmp, bmpWidth, bmpHeight, false);
}
List<String> list = new ArrayList<>(); //binaryString list
StringBuffer sb;
int zeroCount = bmpWidth % 8;
StringBuilder zeroStr = new StringBuilder();
if (zeroCount > 0) {
for (int i = 0; i < (8 - zeroCount); i++) {
zeroStr.append("0");
}
}
for (int i = 0; i < bmpHeight; i++) {
sb = new StringBuffer();
for (int j = 0; j < bmpWidth; j++) {
int color = bmp.getPixel(j, i);
int r = (color >> 16) & 0xff;
int g = (color >> 8) & 0xff;
int b = color & 0xff;
// if color close to white，bit='0', else bit='1'
if (r > 160 && g > 160 && b > 160)
sb.append("0");
else
sb.append("1");
}
if (zeroCount > 0) {
sb.append(zeroStr);
}
list.add(sb.toString());
}
List<String> bmpHexList = binaryListToHexStringList(list);
String commandHexString = "1D763000";
String widthHexString = Integer
.toHexString(bmpWidth % 8 == 0 ? bmpWidth / 8
: (bmpWidth / 8 + 1));
if (widthHexString.length() > 2) {
Log.e("decodeBitmap error", " width is too large");
return null;
} else if (widthHexString.length() == 1) {
widthHexString = "0" + widthHexString;
}
widthHexString = widthHexString + "00";
String heightHexString = Integer.toHexString(bmpHeight);
if (heightHexString.length() > 2) {
Log.e("decodeBitmap error", " height is too large");
return null;
} else if (heightHexString.length() == 1) {
heightHexString = "0" + heightHexString;
}
heightHexString = heightHexString + "00";
List<String> commandList = new ArrayList<>();
commandList.add(commandHexString+widthHexString+heightHexString);
commandList.addAll(bmpHexList);
return hexList2Byte(commandList);
}
private static List<String> binaryListToHexStringList(List<String> list) {
List<String> hexList = new ArrayList<String>();
for (String binaryStr : list) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < binaryStr.length(); i += 8) {
String str = binaryStr.substring(i, i + 8);
String hexString = myBinaryStrToHexString(str);
sb.append(hexString);
}
hexList.add(sb.toString());
}
return hexList;
}
private static String myBinaryStrToHexString(String binaryStr) {
StringBuilder hex = new StringBuilder();
String f4 = binaryStr.substring(0, 4);
String b4 = binaryStr.substring(4, 8);
String hexStr = "0123456789ABCDEF";
for (int i = 0; i < binaryArray.length; i++) {
if (f4.equals(binaryArray[i]))
hex.append(hexStr.substring(i, i + 1));
}
for (int i = 0; i < binaryArray.length; i++) {
if (b4.equals(binaryArray[i]))
hex.append(hexStr.substring(i, i + 1));
}
return hex.toString();
}
private static byte[] hexList2Byte(List<String> list) {
List<byte[]> commandList = new ArrayList<byte[]>();
for (String hexStr : list) {
commandList.add(hexStringToBytes(hexStr));
}
return sysCopy(commandList);
}
private static byte[] hexStringToBytes(String hexString) {
if (hexString == null || hexString.equals("")) {
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++) {
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
private static byte[] sysCopy(List<byte[]> srcArrays) {
int len = 0;
for (byte[] srcArray : srcArrays) {
len += srcArray.length;
}
byte[] destArray = new byte[len];
int destLen = 0;
for (byte[] srcArray : srcArrays) {
System.arraycopy(srcArray, 0, destArray, destLen, srcArray.length);
destLen += srcArray.length;
}
return destArray;
}
private static byte charToByte(char c) {
return (byte) "0123456789ABCDEF".indexOf(c);
}
}
Then I use it in the print activity:
private fun p2(){
val convertBmp : Bitmap
convertBmp = BitmapFactory.decodeResource(getResources(),com.example.ronibluetooth.R.drawable.poly)
val decodeBmp = BitmapHelper.decodeBitmap(convertBmp)
val scope = CoroutineScope(Dispatchers.IO)
scope.launch {
try {
val os =mBluetoothSocket.outputStream
os.write(decodeBmp,0,decodeBmp.size)
}
catch (e: Exception) {
Log.e("PrintActivity", "Exe ", e)
}
}
}
image to print
result print
I have an person model with two property like this:
int id;
String name;
and some object with this data:
person0 = {1,"James"};
person1 = {2,"James"};
person2 = {3,"James"};
person3 = {4,"Barbara"};
person4 = {5,"Barbara"};
person5 = {6,"Ramses"};
and array contain objects:
firstArray = [person0, person1, person2, person3, person4, person5];
Therefore how can have this array:
secondArray = [
[person0, person1, person2],
[person3, person4],
[person5]
]
Thank you.
If language does not matter.
map = new Map();
for (persona of personas) {
name = persona.name;
arrayForName = map.get(name);
if (arrayForName == null) {
arrayForName = [];
map.put(name, arrayForName);
}
arrayForName.put(persona)
}
The idea is to have a map (which is a collection key->value).
The value of the map should in turn be an array.
To add elements efficiently, you iterate only once through the data, and add arrays each time a new key is discovered (i.e. the name).
In Java it would be something like:
Map<String, List<Persona>> map = new HashMap<>();
for (Persona persona : personas) {
String name = persona.getName();
List<Persona> listForName = map.get(name);
if (listForName == null) {
listForName = new ArrayList<Persona>();
map.put(name, listForName);
}
listForName.add(persona)
}
Try this code in Java Android:
ArrayList<ArrayList<Person>> secondArr = new ArrayList<>();
ArrayList<Course> tempArr = new ArrayList<>();
for (int i = 0; i < firstArr.size(); i++) {
if ((i + 1) >= firstArr.size()) {
tempArr.add(firstArr.get(i));
secondArr.add(tempArr);
} else {
if (firstArr.get(i).name .equals( firstArr.get(i + 1).name) ) {
tempArr.add(firstArr.get(i));
} else {
tempArr.add(firstArr.get(i));
secondArr.add(tempArr);
tempArr = new ArrayList<>();
}
}
}
Finally secondArr prepared.
And if list not sorted we can use code like this:
for (int i = 0; i <firstArr.size() ; i++) {
boolean isAdd = false;
for (int j = 0; j < secondArr.size() ; j++) {
if (secondArr.get(j).get(0).getName().equals(firstArr.get(i).getName())){
secondArr.get(j).add(firstArr.get(i));
isAdd =true;
break;
}
}
if (!isAdd){
ArrayList<Person> arrayList = new ArrayList<>();
arrayList.add(firstArr.get(i));
secondArr.add(arrayList);
}
}
I have figured out how to move my character around the maze using the algorithm I have written, but the count is not figuring correctly. At the end of each row my character moves up and down several times until the count reaches the specified number to exit the loop, then the character moves along the next row down until it reaches the other side and repeats the moving up and down until the count reaches the specified number again. Can anyone help me find why my count keeps getting off? The algorithm and the maze class I am calling from is listed below.
public class P4 {
public static void main(String[] args) {
// Create maze
String fileName = args[3];
Maze maze = new Maze(fileName);
System.out.println("Maze name: " + fileName);
// Get dimensions
int mazeWidth = maze.getWidth();
int mazeHeight = maze.getHeight();
// Print maze size
System.out.println("Maze width: " + mazeWidth);
System.out.println("Maze height: " + mazeHeight);
int r = 0;
int c = 0;
// Move commands
while (true){
for (c = 0; c <= mazeWidth; c++){
if (maze.moveRight()){
maze.isDone();
c++;
}
if (maze.isDone() == true){
System.exit(1);
}
if (maze.moveRight() == false && c != mazeWidth){
maze.moveDown();
maze.moveRight();
maze.moveRight();
maze.moveUp();
c++;
}
}
for (r = 0; r % 2 == 0; r++){
maze.moveDown();
maze.isDone();
if (maze.isDone() == true){
System.exit(1);
}
}
for (c = mazeWidth; c >= 0; c--){
if (maze.moveLeft()){
c--;
maze.isDone();
System.out.println(c);
}
if (maze.isDone() == true){
System.exit(1);
}
if (maze.moveLeft() == false && c != 0){
maze.moveDown();
maze.moveLeft();
maze.moveLeft();
maze.moveUp();
c--;
}
}
for (r = 1; r % 2 != 0; r++){
maze.moveDown();
maze.isDone();
if (maze.isDone() == true){
System.exit(1);
}
}
}
}
}
public class Maze {
// Maze variables
private char mazeData[][];
private int mazeHeight, mazeWidth;
private int finalRow, finalCol;
int currRow;
private int currCol;
private int prevRow = -1;
private int prevCol = -1;
// User interface
private JFrame frame;
private JPanel panel;
private Image java, student, success, donotpass;
private ArrayList<JButton> buttons;
// Maze constructor
public Maze(String fileName) {
// Read maze
readMaze(fileName);
// Graphics setup
setupGraphics();
}
// Get height
public int getHeight() {
return mazeHeight;
}
// Get width
public int getWidth() {
return mazeWidth;
}
// Move right
public boolean moveRight() {
// Legal move?
if (currCol + 1 < mazeWidth) {
// Do not pass?
if (mazeData[currRow][currCol + 1] != 'D')
{
currCol++;
redraw(true);
return true;
}
}
return false;
}
// Move left
public boolean moveLeft() {
// Legal move?
if (currCol - 1 >= 0) {
// Do not pass?
if (mazeData[currRow][currCol - 1] != 'D')
{
currCol--;
redraw(true);
return true;
}
}
return false;
}
// Move up
public boolean moveUp() {
// Legal move?
if (currRow - 1 >= 0) {
// Do not pass?
if (mazeData[currRow - 1][currCol] != 'D')
{
currRow--;
redraw(true);
return true;
}
}
return false;
}
// Move down
public boolean moveDown() {
// Legal move?
if (currRow + 1 < mazeHeight) {
// Do not pass?
if (mazeData[currRow + 1][currCol] != 'D')
{
currRow++;
redraw(true);
return true;
}
}
return false;
}
public boolean isDone() {
// Maze solved?
if ((currRow == finalRow) && (currCol == finalCol))
return true;
else
return false;
}
private void redraw(boolean print) {
// Wait for awhile
try {
Thread.sleep(500);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
if (print)
System.out.println("Moved to row " + currRow + ", column " + currCol);
// Compute index and remove icon
int index = (prevRow * mazeWidth) + prevCol;
if ((prevRow >= 0) && (prevCol >= 0)) {
buttons.get(index).setIcon(null);
}
// Compute index and add icon
index = (currRow * mazeWidth) + currCol;
if ((currRow == finalRow) && (currCol == finalCol))
buttons.get(index).setIcon(new ImageIcon(success));
else
buttons.get(index).setIcon(new ImageIcon(student));
// Store previous location
prevRow = currRow;
prevCol = currCol;
}
// Set button
private void setButton(JButton button, int row, int col) {
if (mazeData[row][col] == 'S') {
button.setIcon(new ImageIcon(student));
currRow = row;
currCol = col;
} else if (mazeData[row][col] == 'J') {
button.setIcon(new ImageIcon(java));
finalRow = row;
finalCol = col;
} else if (mazeData[row][col] == 'D') {
button.setIcon(new ImageIcon(donotpass));
}
}
// Read maze
private void readMaze(String filename) {
try {
// Open file
Scanner scan = new Scanner(new File(filename));
// Read numbers
mazeHeight = scan.nextInt();
mazeWidth = scan.nextInt();
// Allocate maze
mazeData = new char[mazeHeight][mazeWidth];
// Read maze
for (int row = 0; row < mazeHeight; row++) {
// Read line
String line = scan.next();
for (int col = 0; col < mazeWidth; col++) {
mazeData[row][col] = line.charAt(col);
}
}
// Close file
scan.close();
} catch (IOException e) {
System.out.println("Cannot read maze: " + filename);
System.exit(0);
}
}
// Setup graphics
private void setupGraphics() {
// Create grid
frame = new JFrame();
panel = new JPanel();
panel.setLayout(new GridLayout(mazeHeight, mazeWidth, 0, 0));
frame.add(Box.createRigidArea(new Dimension(0, 5)), BorderLayout.NORTH);
frame.add(panel, BorderLayout.CENTER);
// Look and feel
try {
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
// Configure window
frame.setSize(mazeWidth * 100, mazeHeight * 100);
frame.setTitle("Maze");
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setAlwaysOnTop(true);
// Load and scale images
ImageIcon icon0 = new ImageIcon("Java.jpg");
Image image0 = icon0.getImage();
java = image0.getScaledInstance(100, 100, Image.SCALE_DEFAULT);
ImageIcon icon1 = new ImageIcon("Student.jpg");
Image image1 = icon1.getImage();
student = image1.getScaledInstance(100, 100, Image.SCALE_DEFAULT);
ImageIcon icon2 = new ImageIcon("Success.jpg");
Image image2 = icon2.getImage();
success = image2.getScaledInstance(100, 100, Image.SCALE_DEFAULT);
ImageIcon icon3 = new ImageIcon("DoNotPass.jpg");
Image image3 = icon3.getImage();
donotpass = image3.getScaledInstance(100, 100, Image.SCALE_DEFAULT);
// Build panel of buttons
buttons = new ArrayList<JButton>();
for (int row = 0; row < mazeHeight; row++) {
for (int col = 0; col < mazeWidth; col++) {
// Initialize and add button
JButton button = new JButton();
Border border = new LineBorder(Color.darkGray, 4);
button.setOpaque(true);
button.setBackground(Color.gray);
button.setBorder(border);
setButton(button, row, col);
panel.add(button);
buttons.add(button);
}
}
// Show window
redraw(false);
frame.setVisible(true);
}
}
One error I can see in your code is that you're incrementing your c counter more often than you should. You start with it managed by your for loop, which means that it will be incremented (or decremented, for the leftward moving version) at the end of each pass through the loop. However, you also increment it an additional time in two of your if statements. That means that c might increase by two or three on a single pass through the loop, which is probably not what you intend.
Furthermore, the count doesn't necessarily have anything obvious to do with the number of moves you make. The loop code will always increase it by one, even if you're repeatedly trying to move through an impassible wall.
I don't really understand what your algorithm is supposed to be, so I don't have any detailed advice for how to fix your code.
One suggestion I have though is that you probably don't ever want to be calling methods on your Maze class without paying attention to their return values. You have a bunch of places where you call isDone but ignore the return value, which doesn't make any sense. Similarly, you should always be checking the return values from your moveX calls, to see if the move was successful or not. Otherwise you may just blunder around a bunch, without your code having any clue where you are in the maze.
My J2ME midlet could retrieves message in Chinese character from a PHP server but it's garbled. The server basically returns the response string and by detecting the first 2 characters. AA = good, anything else indicates error of which the message is to be passed to the calling function for display
InputStream is = null;
StringBuffer sb = null;
String str = "";
HttpConnection http = null;
DataOutputStream dos = null;
try
{
URL = login.getURL();
URL += ctlFunction + "/" + uriStr;
URL = EncodeURL(URL);
//System.out.println(URL);
if(!ctlFunction.equals("login"))
{
msg += "&user=" + login.getUsername();
msg += "&token=" + login.getToken();
}
msg += "&lang=" + System.getProperty("microedition.locale");
// establish the connection
http = (HttpConnection) Connector.open(URL);
http.setRequestMethod(HttpConnection.POST);
http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
http.setRequestProperty("Content-length", ""+EncodeURL(msg).getBytes().length);
dos = http.openDataOutputStream();
byte[] request_body = EncodeURL(msg).getBytes();
for (int i = 0; i < request_body.length; i++)
{
dos.writeByte(request_body[i]);
}
// server response
if (http.getResponseCode() == HttpConnection.HTTP_OK)
{
is = http.openDataInputStream();
int length = (int) http.getLength();
if (length != -1)
{
// Read data in one chunk
byte serverData[] = new byte[length];
is.read(serverData);
str = new String(serverData);
}
else // Length not available...
{
ByteArrayOutputStream bStrm = new ByteArrayOutputStream();
int ch;
while ((ch = is.read()) != -1)
bStrm.write(ch);
str = new String(bStrm.toByteArray());
bStrm.close();
}
}
else
{
networkError();
}
}
catch (Exception e)
{
System.err.println("Error3: " + e.toString());
networkError(e.toString());
}
finally
{
if (is != null)
is.close();
if (!str.equals(""))
post = str;
else
networkError();
if (http != null)
http.close();
}
if (post != null)
{
String fate = post.substring(0, 2);
if(fate.equals("AA"))
{
if(ctlFunction.equals("login"))
{
String rawPost = post.substring(2);
Vector v = new Vector();
int index = 0;
//find the first occurrence of the SPLITTER
int endIndex = rawPost.indexOf(SPLITTER, index);
String item = "";
//extract the items until the end of the last SPLITTER found in the rawPost string
while(endIndex != -1)
{
item = rawPost.substring(index, endIndex);
index = endIndex + 1;
endIndex = rawPost.indexOf(SPLITTER, index);
v.addElement(item);
}
//extract the rest of the rawPost (the text item)
item = rawPost.substring(index);
v.addElement(item);
String[] ret = new String[v.size()];
v.copyInto(ret);
login.setToken(ret[0]);
login.setToday(ret[1]);
login.setNextDrawDay(ret[2]);
}
midlet.returnResults(post.substring(2), getCurrentDisplay(), ctlFunction);
}
else
{
String errmessage = post.substring(2);
System.out.println(post);
midlet.showInfo(post, getCurrentDisplay());
}
}
else
{
networkError();
}
On the PHP server, I have set the header to UTF-8 encoding
<?php header("Content-Type:text/plain; charset=utf-8"); ?>
What could possibly be wrong?
I found that this user has the same problem and it's been answered
Reading UTF8 strings from a server through http using MIDP. Kudos to the answer.
I basically edited my MIDP code from
// is = http.openDataInputStream();
// int length = (int) http.getLength();
// if (length != -1)
// {
// // Read data in one chunk
// byte serverData[] = new byte[length];
// is.read(serverData);
// str = new String(serverData);
// }
// else // Length not available...
// {
// ByteArrayOutputStream bStrm = new ByteArrayOutputStream();
// int ch;
// while ((ch = is.read()) != -1)
// bStrm.write(ch);
//
// str = new String(bStrm.toByteArray());
// bStrm.close();
// }
to
Reader r = new InputStreamReader(http.openInputStream(), "UTF-8");
int ch;
while((ch = r.read()) != -1)
str = str + (char)ch;
just wondering though why does reading bytes messes up the UTF-8 characters?
I´m exporting datatables to Excel workbook. Problem is that the datatable holds 90000 rows and excel can only hold 67000 rows in every sheet.
So..
How can i divide one big datatable to two datatables, maybe with Linq ?
Then i can have datatable1 in sheet1 and datatable2 in sheet2
Sincerly
agh
Assuming that you're getting the 90,000 rows for this DataTable from a database somewhere, the most efficient approach would be to modify your SELECT statement into two new SELECT statements, each of which returns < 67,000 rows, and then do everything else the same.
Split your recordset. Perform one SELECT that extracts all 90,000 rows, and split it on Excel import step.
private List<DataTable> CloneTable(DataTable tableToClone, int countLimit)//Split function
{
List<DataTable> tables = new List<DataTable>();
int count = 0;
DataTable copyTable = null;
foreach (DataRow dr in tableToClone.Rows)
{
if ((count++ % countLimit) == 0)
{
copyTable = new DataTable();
copyTable = tableToClone.Clone();
copyTable.TableName = "Sample" + count;
tables.Add(copyTable);
}
copyTable.ImportRow(dr);
}
return tables;
}
protected void LinkReport_Click(object sender, EventArgs e)
{
DataTable dt2 = (DataTable)ViewState["dtab"];
List<DataTable> dt1 = CloneTable(dt2, 5);
DataSet ds = new DataSet("dst");
for (int i = 0; i < dt1.Count; i++)
{
ds.Tables.Add(dt1[i]);
}
string filePath = Server.MapPath("Reports/").ToString() + "master.xls";
FileInfo file = new FileInfo(filePath);
if (file.Exists)
{
file.Delete();
}
Export(ds, filePath);// Export into Excel
}
Clone - The fastest method to create tables with original columns structure is Clone method.
Export into Excel
private void releaseObject(object obj)
{
try
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
obj = null;
}
catch (Exception ex)
{
obj = null;
}
finally
{
GC.Collect();
}
}
public void Export(DataSet ds, string filePath)
{
string data = null;
string columnName = null;
int i = 0;
int j = 0;
Excel.Application xlApp;
Excel.Workbook xlWorkBook;
//Excel.Worksheet xlWorkSheet;
Excel.Worksheet xlWorkSheet = null;
object misValue = System.Reflection.Missing.Value;
Excel.Range range;
xlApp = new Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Add(misValue);
//xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
for (int l = 0; l < ds.Tables.Count; l++)
{
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(l + 1);
xlWorkSheet.Cells[1, 1] = "Report";
xlWorkSheet.get_Range("A1:D1", Type.Missing).Merge(Type.Missing);
xlWorkSheet.get_Range("A1", "D1").Font.Bold = true;
xlWorkSheet.Cells.Font.Name = "Courier New";
if (l == 0)
{
xlWorkSheet.Name = "Sheet1";
}
else if (l == 1)
{
xlWorkSheet.Name = "Sheet2";
}
else if (l == 2)
{
xlWorkSheet.Name = "Sheet3";
}
else if (l == 3)
{
xlWorkSheet.Name = "Sheet4";
}
else if (l == 4)
{
xlWorkSheet.Name = "Sheet5";
}
for (i = 0; i <= ds.Tables[l].Rows.Count - 1; i++)
{
for (j = 0; j <= ds.Tables[l].Columns.Count - 1; j++)
{
columnName = ds.Tables[l].Columns[j].ColumnName.ToString();
xlWorkSheet.Cells[3, j + 1] = columnName;
data = ds.Tables[l].Rows[i].ItemArray[j].ToString();
xlWorkSheet.Cells[i + 5, j + 1] = data;
}
}
}
//for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
//{
// for (j = 0; j <= ds.Tables[0].Columns.Count - 1; j++)
// {
// data = ds.Tables[0].Rows[i].ItemArray[j].ToString();
// xlWorkSheet1.Cells[i + 1, j + 1] = data;
// }
//}
xlWorkBook.SaveAs(filePath, Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
// kill all excel processes
Process[] pros = Process.GetProcesses();
for (int p = 0; p < pros.Length; p++)
{
if (pros[p].ProcessName.ToLower().Contains("excel"))
{
pros[p].Kill();
break;
}
}
releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);
}
Try this One.. I have Worked out in Visual Studio 2005
DataTable[] splittedtables = dt.AsEnumerable()
.Select((row, index) => new { row, index })
.GroupBy(x => x.index / Input From User) // integer division, the fractional part is truncated
.Select(g => g.Select(x => x.row).CopyToDataTable())
.ToArray();
This should work.