I was able to download file in zip format from remote server, but when unzip the file containing videos, I got error like this
E/flutter (11680): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: FileSystemException: Creation failed, path = 'out' (OS Error: Read-only file system, errno = 30)
E/flutter (11680): #0 _Directory.createSync (dart:io/directory_impl.dart:133:7)
E/flutter (11680): #1 extractArchiveToDisk
package:archive/…/io/extract_archive_to_disk.dart:21
E/flutter (11680): #2 ZipService.unzipSigns
package:gsl_distionary/services/zip_service.dart:13
E/flutter (11680): <asynchronous suspension>
Below is my code to unzip file using archive package:
static Future unzipSigns(String fileName) async {
final dir = await getApplicationSupportDirectory();
final bool isZippedFile = await File("${dir.path}/$fileName").exists();
if (isZippedFile) {
final inputStream = InputFileStream("${dir.path}/$fileName");
final archive = ZipDecoder().decodeBuffer(inputStream);
extractArchiveToDisk(archive, 'out');
}
}
What did I miss?
Related
E/flutter ( 8448): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: FormatException: Unexpected character (at character 1)
E/flutter ( 8448):
E/flutter ( 8448): ^
enter image description here
Encode the body data when post method is used
var res = await http.post(Uri.parse(url), body: jsonEncode(data));
This is the code I am using.
I have checked it with different file format but still showing the same error, i have checked the "img.path" its showing the path to the image. I don't understand why I am getting an error.
String targetPath;
var result = await FlutterImageCompress.compressAndGetFile(
img.path,
targetPath,
quality: 88,
format: CompressFormat.webp,
);
Error I am getting:
[ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: The method 'toLowerCase' was called on null.
Receiver: null
Tried calling: toLowerCase()
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
#1 Validator.checkFileNameAndFormat
package:flutter_image_compress/src/validator.dart:19
#2 FlutterImageCompress.compressAndGetFile
package:flutter_image_compress/flutter_image_compress.dart:150
#3 _AddImageState.uploadFile
package:softclaw/…/addpost/addimage.dart:225
#4 _AddImageState.build.<anonymous closure>
package:softclaw/…/addpost/addimage.dart:97
<asynchronous suspension>
targetPath is the one that goes through the checkFileNameAndFormat > toLowerCase, therefore check to ensure this is not null.
I am getting the following error Unhandled Exception: Null check operator and I am not sure if it is something wrong in my code or the library I am using. I am trying to test the livequery of the parse_server_sdk used by back4app because I require sending and receiving images in Realtime. Here is the relevant code:
import 'dart:io';
import 'package:filepicker_windows/filepicker_windows.dart';
import 'package:flutter/material.dart';
import 'package:parse_server_sdk_flutter/parse_server_sdk.dart';
void main() async {
final keyApplicationId = 'EPARW6nRAAyp5uehoDE7rBEby4wtehcZf9EayykS';
final keyClientKey = 'fDaL2DjyC9YdwCwZ4RB5c5vhACROaMOO1EjjL4Zn';
final keyParseServerUrl = 'https://parseapi.back4app.com';
final LIVE_QUERY_URL = 'wss://samuraichat.b4a.io';
await Parse().initialize(keyApplicationId, keyParseServerUrl,
clientKey: keyClientKey,
autoSendSessionId: true,
liveQueryUrl: LIVE_QUERY_URL,
coreStore: CoreStoreMemoryImp());
final LiveQuery liveQuery = LiveQuery();
QueryBuilder<ParseObject> query =
QueryBuilder<ParseObject>(ParseObject('FirstClass'))
..whereEqualTo('chatId', 1);
Subscription subscription = await liveQuery.client.subscribe(query);
subscription.on(LiveQueryEvent.create, (value) {
print('*** CREATE ***: ${DateTime.now().toString()}\n $value ');
print((value as ParseObject).objectId);
print((value as ParseObject).get('message'));
});
runApp(MyApp());
}
Here is the error stack:
[ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: Null check operator used on a null value
#0 MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:142:86)
#1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:148:36)
#2 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:331:12)
#3 MethodChannelConnectivity.checkConnectivity (package:connectivity_platform_interface/src/method_channel_connectivity.dart:41:29)
#4 Connectivity.checkConnectivity (package:connectivity/connectivity.dart:46:22)
#5 Parse.checkConnectivity (package:parse_server_sdk_flutter/parse_server_sdk.dart:106:34)
#6 new LiveQueryReconnectingController (package:parse_server_sdk/src/network/parse_live_query.dart:45:28)
#7 new LiveQueryClient._internal (package:parse_server_sdk/src/network/parse_live_query.dart:146:30)
#8 LiveQueryClient._getInstance (package:parse_server_sdk/src/network/parse_live_query.dart:153:35)
#9 new LiveQuery (package:parse_server_sdk/src/network/parse_live_query.dart:416:30)
#10 main (package:chat_app/main.dart:18:37)
<asynchronous suspension>
Thanks.
Try to clean your app cache:
flutter clean
This bug should be fixed with this PR.
You use the current nullsafety branch by overriding the dependency in your pubspec.yaml:
dependency_overrides:
parse_server_sdk_flutter:
git:
url: https://github.com/parse-community/Parse-SDK-Flutter.git
ref: nullsafety
path: packages/flutter
parse_server_sdk:
git:
url: https://github.com/parse-community/Parse-SDK-Flutter.git
ref: nullsafety
path: packages/dart
I'm here new, I'm learning flutter and I need login with this:
POST http://localhost:3000/api/users/session
But I still can't login :( I'm waiting 5 minutes and still there is a loading screen with no effects.
I have try
So I have have made a this api_service with this tutorial made https://www.youtube.com/watch?v=_Kw4BfNX1-4
here is my api_service.dart
import 'package:http/http.dart' as http;
import 'dart:convert';
import '../model/login_model.dart';
class APIService {
Future<LoginResponseModel>
login(LoginRequestModel requestModel) async {
String url = "http://localhost:3000/api/users/session";
final response = await http.post(url, body: requestModel.toJson());
if (response.statusCode == 200 || response.statusCode == 400) {
return LoginResponseModel.fromJson(
json.decode(response.body),
);
} else {
throw Exception('Failed to load data!');
}
}
}
Here is debug console:
E/flutter (10967): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)]
Unhandled Exception: SocketException: OS Error: Connection refused,
errno = 111, address = localhost, port = 58856 E/flutter (10967):
I'm try with this page:
https://medium.com/#podcoder/connecting-flutter-application-to-localhost-a1022df63130
I change String url = "http://localhost:3000/api/users/session"; to
String url = "http://10.0.2.2:3000/api/users/session";
in my debug console i have completely different messages, but stilll
don't work :(
E/flutter (10967):
[ERROR:flutter/lib/ui/ui_dart_state.cc(186)]
Unhandled Exception: Bad state: Insecure HTTP is not allowed by
platform: http://10.0.2.2:3000/api/users/session
E/flutter (10967): #0 _HttpClient._openUrl
(dart:_http/http_impl.dart:2434:7)
E/flutter (10967): #1 _HttpClient.openUrl
(dart:_http/http_impl.dart:2341:7)
E/flutter (10967): #2 IOClient.send
package:http/src/io_client.dart:31
(...) to #28 and the last ist E/flutter (10967):
Fix for the Error Unhandled Exception: Bad state: Insecure HTTP is not allowed by platform
Flutter terms http as an insecure source Therefore you should either use https or set android:usesCleartextTraffic to true in AndroidManifest
<uses-permission android:name="android.permission.INTERNET" />
<application
android:name="io.flutter.app.FlutterApplication"
android:label="receipt"
android:usesCleartextTraffic="true" // Add this line
android:icon="#mipmap/ic_launcher">
I have a basic flutter project running on android where when the application starts, I write an executable bundled in my assets.
static String appInternalPath = '/data/data/com.maksimdan.face_merger';
void writeExecutable() async {
var executablePath = join(appInternalPath, 'main');
if (await File(executablePath).exists()) {
File(executablePath).delete();
print('deleted old executable');
} else {
print('not executable exists');
}
ByteData data = await rootBundle.load('lib/py/dist/main');
List<int> bytes =
data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
await File(executablePath).writeAsBytes(bytes);
print('wrote new executable');
}
Sometime later in my code I try to run it.
void invokeExecutable() async {
String executablePath = join(appInternalPath, 'main');
Process.run('chmod', ['u+x', executablePath]).then((ProcessResult results) {
Process.run(executablePath, []).then((ProcessResult results) {
print(results.stdout);
});
});
}
But obtain a permission denied error.
E/flutter (31825): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: ProcessException: Permission denied
E/flutter (31825): Command: /data/data/com.maksimdan.flutter_general/main
E/flutter (31825): #0 _ProcessImpl._start (dart:io-patch/process_patch.dart:390:33)
E/flutter (31825): #1 Process.start (dart:io-patch/process_patch.dart:36:20)
E/flutter (31825): #2 _runNonInteractiveProcess (dart:io-patch/process_patch.dart:565:18)
E/flutter (31825): #3 Process.run (dart:io-patch/process_patch.dart:47:12)
E/flutter (31825): #4 _MyHomePageState.invokeExecutable.<anonymous closure> (package:flutter_general/main.dart:51:15)
E/flutter (31825): #5 _rootRunUnary (dart:async/zone.dart:1362:47)
E/flutter (31825): #6 _CustomZone.runUnary (dart:async/zone.dart:1265:19)
E/flutter (31825): <asynchronous suspension>
I've also tried:
Process.run('/system/bin/chmod', ['744', path]).then((ProcessResult results) {
print('shell1 complete');
Process.run(path, []).then((ProcessResult results) {
print('shell2 complete');
print(results.stdout);
});
});
My executable:
// 'Hello World!' program
#include <iostream>
int main()
{
std::cout << "Hello World!" << std::endl;
return 0;
}
>> g++ main.cc -o main
Is there a way to run your own executables in flutter with the proper permissions? On native android, there is an option to file.setExecutable(true); using this strategy. (Hosting an executable within Android application)
Or will I have to experiment with method channels?
pubspec.yml
name: face_merger
description: A new Flutter project.
version: 1.0.0+1
environment:
sdk: ">=2.1.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
sqflite: ^1.3.0+2
process_run: ^0.10.10+1
cupertino_icons: ^0.1.3
dev_dependencies:
flutter_test:
sdk: flutter
flutter:
uses-material-design: true
assets:
- lib/py/dist/main
I also verified that the file was written to the internal memory of on the device that I expected it to be written to using android studio's device explore.
Besides the writable permission you need to have readable permission in your app.
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.xxx.yyy">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
...
You need to put the .db file extension at the end of the database name (Assuming DB_DIR is for a database). var path = join(DB_DIR, 'main.db');
Then I think you may want to use path_provider package and use
Directory documentsDirectory = await getApplicationDocumentsDirectory();
for the directory where you are accessing the database.