CodeIonic

testImage(){
    this.platform.ready().then(()=>{
      preparaBase64('path image');
      function preparaBase64(url) {
        readImage(url, function (base64) {
            print(base64);
        });
    }
    function readImage(url, callback) {
      console.log(url);

      var request = new XMLHttpRequest();
      request.onload = function () {
          var file = new FileReader();
          file.onloadend = function () {
              callback(file.result);
          }
          file.readAsDataURL(request.response);
      };
      request.open('GET', url);
      request.responseType = 'blob';
      request.send();
    }

    function print(base64) {
          window.BTPrinter.list(function (data1) {
              window.BTPrinter.connect(function (data2) {
                  console.log(data2);
                  window.BTPrinter.printBase64(function (data) {
                      console.log(data);
                  }, function (err) {
                      console.log(err);
                  }, base64, '1');
                  window.BTPrinter.printPOSCommand(null, null, "0A");
                  window.BTPrinter.printPOSCommand(null, null, "0A");
                  window.BTPrinter.printPOSCommand(null, null, "0A");
                  window.BTPrinter.printPOSCommand(null, null, "0A");
              }, function (err) {
                  console.log(err);
              }, "print name");
          }, function (err) {
              console.log(err);
          });
          window.BTPrinter.disconnect(function (data) {
              console.log(data);
          }, function (err) {
              console.log(err);
          }, "print name");
      }
    })
  }