Flutter FormatException:意外字符(在字符1处) [英] Flutter FormatException: Unexpected character (at character 1)

问题描述

在扑朔迷离中，我使用了一个php文件，该文件从数据库查询返回了json响应，但是当我尝试解码json时，我得到了此错误:

In flutter, i use a php file which returns a json response from a db query, but when i try to decode json i getting this error:

E/flutter ( 8294): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled
Exception: FormatException: Unexpected character (at character 1)
E/flutter ( 8294): [{"0":"PRUEBA","usu_nombre":"PRUEBA"}]
E/flutter ( 8294): ^

这是我的飞镖功能:

Future<String> iniciarSesion() async{
var usuario = textUsuario.text;
var password = textPassword.text;
var nombreUsuario;
var url ="http://192.168.1.37/usuario.php";

//Metodo post
var response = await http.post(
    url,
    headers:{ "Accept": "application/json" } ,
    body: { "usuario": '$usuario',"password": '$password'},
    encoding: Encoding.getByName("utf-8")
);
  List data = json.decode(response.body);
}

然后从我的php文件中获取代码:

And code from my php file:

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');

include_once "Clases/conexion.php";

$usuario = $_POST['usuario'];
$password = $_POST['password'];

$consulta = "select usu_nombre
FROM usu_usuarios
WHERE usu_nusuario='$usuario'and usu_password='$password' and  usu_activo='SI'";

$mysql_obj = new Conectar();
$mysqli = $mysql_obj->crearConexion();

if($result = $mysqli->query($consulta)) {
if ($mysqli->affected_rows > 0) {
    while($row = $result->fetch_array()) {
        $myArray[] = $row;
    }
    header('Content-type: application/json');
    echo json_encode($myArray);
}else {
    header("HTTP/1.0 401 Datos Incorrectos");
    header('Content-type: application/json');
    $data = array("mensaje" => "Datos Incorrectos");
    echo json_encode($data);
}}
?>

我正在使用http dart依赖

I'm using http dart dependence

推荐答案

最后，我使用laravel解决了问题，以这种方式返回了数据

Finally i resolve the problem using laravel, returning the data in this way

return response()->json($yourData, 200, ['Content-Type' => 'application/json;charset=UTF-8', 'Charset' => 'utf-8'],
    JSON_UNESCAPED_UNICODE

我注意到此错误仅在仿真器中发生，而不在物理设备中发生.

I have noticed that this error occurs only in emulator, but not in a physical device.

这篇关于Flutter FormatException:意外字符(在字符1处)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！