How to add user defined character set in Thermal printer using Escape sequence?

Question

I want to add Hindi character set into my Thermal printer (Gprinter Model:GP-U80030I) using escape sequence (ESC/POS). I read Escape commands from program manual. In what sequence I should send commands to printer. Commands to be used are:

ESC % n
ESC & y c1 c2 [x1 d1...d(y X x1)]...[xk d1...d(y X xk)]
ESC ? n

I am sending ascii values to printer (ex. ESC - 27, % - 38 etc).

Answer 1

Start with something like this:

 private void defineChars() {
        int[] cmd = new int[5 + 37] ; // already set to 0
        cmd[0] = 0x1b; // ESC
        cmd[1] = 0x26; // &
        cmd[2] = 0x03; // y - height
        cmd[3] = 'A'; // starting char to define, c1, 'A' ..
        cmd[4] = 'A'; // c2, ending character, in this case we define only one
        cmd[5] = 12; // x1, dots in horizontal direction

        int shift = 6;

        // fill the matrix as you wish..
        // 'A' -> black square
        for (int i = 0; i < 36; i++) {
            cmd[i + shift] = 0xff;
        }
        sendCommand(cmd);

    }

Don't forget to activate custom fonts with command afterwards:

private void setCustomChars(boolean set) {
        //select user defined chars
        sendCommand(0x1B, 0x25, (set) ? 1 : 0);
    }

Now, when you send the 'A' character to the printer it will print your custom defined character (black sqare because all the bits are set to 1)..