Java Question b4a lib from .jar

[George Anifantakis]

I manage to compile the project. Trying to use the new lib inside b4a i got an error that the reference lib was missing. The initial lib actually was there but as i mentioned above it had a different name. So i change the .jar file name to be same with the class name and finally it worked.

 

[George Anifantakis]

Hi

I manage to get the correct sdk but know I am facing the below problem.

After long discussion and tests with the vendor I asked and receive an operational from their part example of printing just on line within a block. Building and executing the function as a lib inside b4a I can't print. During debugging I found that all the statements are working correctly except the statement sending the string to the printer which execute without error but the printer doesn't print. The test application that vendor send me is working properly. Is there any additional statement needed perhaps inside b4a to allow the sending command to execute successfully? Below the code in lib.

package anywheresoftware.b4a.objects;


import defaultPackage.PRTAndroidPrint;


import java.io.UnsupportedEncodingException;


import anywheresoftware.b4a.BA;

import anywheresoftware.b4a.BA.ActivityObject;

import anywheresoftware.b4a.BA.DependsOn;

import anywheresoftware.b4a.BA.Permissions;

import anywheresoftware.b4a.BA.ShortName;

import anywheresoftware.b4a.BA.Version;


import android.bluetooth.BluetoothAdapter;

import android.bluetooth.BluetoothDevice;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.DialogInterface;

import android.content.Intent;

import android.os.Bundle;


@Version(1.0f)

/*@Permissions(values={"android.permission.INTERNET"})*/

@Permissions(values={"android.permission.BLUETOOTH"})

@ShortName("MPT2")

@DependsOn(values={"PRTAndroidPrint"})

@ActivityObject


public class MPTII {



public int prtTest2() throws UnsupportedEncodingException {



PRTAndroidPrint mob=new PRTAndroidPrint();

boolean bRes = mob.PRTInitLib();

BluetoothAdapter mBluetoothAdapter = null;

mBluetoothAdapter=BluetoothAdapter.getDefaultAdapter();

mBluetoothAdapter.enable();

int ires=0;

PRTAndroidPrint.bluetoothAddress = "00:02:5B:B3:22:09";

bRes = mob.PRTConnectDevices();

if (bRes) {

ires+=5;}

bRes = mob.PRTReset();

mob.PRTFormatString(false, false, false, false, false);



//TXT for printing

String str="12345565";

byte data[] = null;

try {

//get printing byte array by making coding

data = str.getBytes("gb2312");

} catch (UnsupportedEncodingException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

//Edit command

byte sendText[]=new byte[3];

sendText[0]=0x1B;

sendText[1]=0x74;

sendText[2]=(byte)23;//coding scheme

mob.PRTSendBuffer(sendText, sendText.length);

mob.PRTSendBuffer(data, data.length);

//Paper running



mob.PRTFeedLines(20);

mob.PRTReset();

mob.PRTCloseConnect();

return ires;

}



}


Thanks.

 

[Erel]

Your code hides the error message. Have you checked the unfiltered logs?

e.printStackTrace will print the error in the unfiltered logs.

 

[George Anifantakis]

Sorry but i don't know java. Where this statement should be placed. Also for some reason perhaps because the app is installed in the tablet the logs are not appeared. There is an error opening trace file: No such file or directory (2)

 

[Erel]

The statement is already there. You should open the unfiltered logs in the IDE to check them.