captcha.getCaptcha Blank Response

[marcos-nunes-dev]

Im trying to use with http://www.detran.rj.gov.br/captcha/captcha.asp?montaCaptcha=1&x=1540240788840 this captcha. Everything looks good but the:
console.log(captcha.getCaptcha(pixMap));
is blank a blank response. Inside pixMap everything looks right.

There is something there Im doing wrong?

Full code:

`
const unirest = require('unirest');
const captcha = require('./CaptchaParser');

let captchaUri = await page.$eval(CAPTCHA, e => e.getAttribute('src'));
console.log('captcha uri', captchaUri);

var onRequest = function(response) {
  if (response.error) {
    console.log('VIT Academics connection failed');
  } else {
    let pixMap = captcha.getPixelMapFromBuffer(response.body); //Working Here
    fs.writeFileSync('captcha.bmp', response.body);
    console.log("Blank Here", captcha.getCaptcha(pixMap));
  }
};
unirest
  .get(captchaUri)
  .encoding(null)
  .set('Content-Type', 'image/bmp')
  .end(onRequest);

`
CaptchaUri is the link above

[karthikb351]

@MarcosRenato266 You are using this correctly, but this library is designed specifically for one type of captcha - you'll need to change the 'keys' section of the library with maps for the letters/numbers for your captcha.

Basically you need to make a 2D array (like a matrix) for each letter, with 0 for blanks and 1s for spaces where the letter is.

Look at https://github.com/karthikb351/CaptchaParser/blob/master/CaptchaParser.js#L2-L15 and do a search for `1', you'll notice the shape of the digit 0.