Question 75618 in Flutter Question posted in
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How to parse a String to int and not get the next errors? – Flutter

Withvar pinU = int.parse(pin.text); I get this error:

E/flutter (16045): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: FormatException: Invalid number (at character 1)
E/flutter (16045):
E/flutter (16045): ^

With var pinU = pin as int; I get this error:

E/flutter (16045): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: type 'String' is not a subtype of type 'int' in type cast

I’m trying to pass a PIN to the database helper function to get the results.
Here is my complete function:

login2() async {
    var usernameU = username.text;
    var pinU = int.parse(pin.text);

    await DBProvider.db.getUser(usernameU, pinU).then((tempUser) {
      Navigator.push(context as BuildContext,
          MaterialPageRoute(builder: (context) => const WelcomePage()));
    }).catchError((err) {
      // ignore: avoid_print
      print('Error: $err');
    });
  }

I need to pass a int, but this error is persistent.

Tags:

2

Answers


  1. 0

    Instead of var use int as datatype.

    int pinU = int.parse(pin.text ?? "0");
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  2. 0

    Try this:

    if (pin.text.isEmpty) {
   // tell a user that this field is required or do something else
   return;
}

final pinU = int.parse(pin.text);

    You also need to set your TextField to accept only numbers, or you should use tryParse instead.

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