How to print the Bold Letters.

[saibrahamaiah]

How to print the Bold Letters and Change the font size.

[Darkarmour]

The following ESCPOS Commands(HexaDcimal) might be useful
1B 45 01 => Bold,
1B 45 00 => Without Bold,
1B 21 01 => Small sized font,
1B 21 00 => Normal sized font

[saibrahamaiah]

Thank You @Darkarmour for your reply. Can please give me any example for bold. Where the use these commands. I don't want entire example just give important those 10 lines only.
Thank You.

[Darkarmour]

command = '1B 40'; //Initialize the Printer to accept POS Commands
command += '1B 61 01'; //Initialize Center Alignment
command += '1B 21 01'; //Initialize small sized font
command += '1B 45 01'; //Initialize Bold
command += HEXA('Dark'); //Get the hexadecimal value for the name 'Dark'
command += '0A'; //Next line feed
command += '1B 21 00'; //Initialize normal font
command += '1B 45 00'; //Initialize withour bold
command += HEXA('Armour'); //Get the hexadecimal value for the name 'Armour'
command += '0A'; //Next line feed

[saibrahamaiah]

Hi
First of all Thank You @Darkarmour for your reply.
Suppose if i want print Hello World in Bold Letters
like as below
command = '1B 45 01' + 'Hello World' + '1B 45 01';
See code here

this.print(command)
 print() {        
      BTPrinter.printText((data) => {                       
              this.feed();
      }, (err) => {            
          alert("Error")
      }, command);
  };

  feed() {
      BTPrinter.printPOSCommand((data) => {
      }, (err) => {            
          alert("Error")
      }, "0C")        
  };

Is this correct ?
Please tell me.

[Darkarmour]

Hi,
The following needs to be done for Bluetooth Printing with this Plugin,

• Check for Bluetooth connectivity
• Print POS Command/ text
• Disconnect the printer (If necessary)
  Make sure that you have done the above things right.

And as for the Command is concerned
command = '1B 40 ';//Initiliase
command += '1B 45 01 ' + hex('Hello World') //Convert the string to its hexa value
If you face any more issues, let know me of the issue.

[saibrahamaiah]

Hi Darkarmour, Thank you for your reply. But Iam still facing problem. I am getting Socket closed issue
I tried like
but it prints one time bold hex() not working. It is showing function not defined. So i used

toHex(str) {
        var hex = '';
        for(var i=0;i<str.length;i++) {
            hex += ''+str.charCodeAt(i).toString(16);
        }
        return hex;
    }

    ```

this.printData = '1B 40 ';
this.printData += '1B 45 01 ';
this.printData += this.toHex('Hello World')

    BTPrinter.printPOSCommand((data) => {            
        this.disconnect();
    }, (err) => {
        alert(err)
    }, this.printData)
    
    BTPrinter.printText((data) => {            
        this.util.alert("ok", "Info", "Printing...", null, null);
        this.feed();            
    }, (err) => {
        alert(err)
    }, this.printData);       

It printed bold letters but diffrent characters displayed.
Can u please forward working example to my mail,
this is my mail sai.brahamaiah@gmail.com

[Darkarmour]

Hi @saibrahamaiah!

1. It printed bold letters but different characters displayed. - This issue can happen due to the incorrect conversion of HexCode of the string. Please verify that you send the correct HexCode
2. Socket closed issue - This might occur due to the Bluetooth connection getting closed before the printing even happened. So try it with a timeout for disconnect().

Try changing with this. If you still face the issue, let me know.

[sagar999-stack]

public boolean PrintfData(byte[]data) {
    mSockManager.threadconnectwrite(data);
    try {
        Thread.sleep(100);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    if (mSockManager.getIstate()) {
        return true;
    }
    else {
        return false;
    }
}

how to bold this byte array?