Flutter Dio : How to Upload Image? - flutter

Question

I'm trying on Postman. And it works
I want upload some image to rest-api using Package DIO Package ,
I'm new for this package (i'm use this package just for CRUD operation) and i'm got problem when upload image operation.
i'm already reading documentation and nothing see for upload images. I'm try this code(ref on documentation) and got some error :
error:FileSystemException
message :"Cannot retrieve length of file"
OSError (OS Error: No such file or directory, errno = 2)
"File: '/storage/emulated/0/Android/data/com.example.mosque/files/Pictures/scaled_IMG_20190815_183541.jpg'"
Type (FileSystemException)
message:FileSystemException: Cannot retrieve length of file, path = 'File: '/storage/emulated/0/Android/data/com.example.mosque/files/Pictures/scaled_IMG_20190815_183541.jpg'' (OS Error: No such file or directory, errno = 2)
DioErrorType (DioErrorType.DEFAULT)
name:"DioErrorType.DEFAULT"
Api.dart
Future uploadImage({dynamic data,Options options}) async{
Response apiRespon = await dio.post('$baseURL/mahasiswa/upload/',data: data,options: options);
if(apiRespon.statusCode== 201){
return apiRespon.statusCode==201;
}else{
print('errr');
return null;
}
}
View.dart
void uploadImage() async {
FormData formData = FormData.from({
"name_image": _txtNameImage.text,
"image": UploadFileInfo(File("$_image"), "image.jpg")
});
bool upload =
await api.uploadImage(data: formData, options: CrudComponent.options);
upload ? print('success') : print('fail');
}
_image is type FILE
I hope who expert with this package can help me with this code and suggest me for upload images.
Thanks.
Full View.dart Code
import 'dart:io';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:mosque/api/api_mosque.dart';
class UploadImage extends StatefulWidget {
#override
_UploadImageState createState() => _UploadImageState();
}
class _UploadImageState extends State<UploadImage> {
ApiHelper api = ApiHelper();
File _image;
TextEditingController _txtNameImage = TextEditingController();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: IconButton(
icon: Icon(Icons.arrow_left),
onPressed: () => Navigator.pop(context, false),
),
actions: <Widget>[
IconButton(
icon: Icon(Icons.file_upload),
onPressed: () {
uploadImage();
},
)
],
),
body: _formUpload(),
);
}
Widget _formUpload() {
return SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Column(
children: <Widget>[
TextField(
controller: _txtNameImage,
keyboardType: TextInputType.text,
decoration: InputDecoration(hintText: "Nama Image"),
maxLength: 9,
textAlign: TextAlign.center,
),
SizedBox(
height: 50.0,
),
Container(
child: _image == null
? Text('No Images Selected')
: Image.file(_image),
),
SizedBox(
height: 50.0,
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
RaisedButton(
child: Icon(Icons.camera),
onPressed: () => getImageCamera(),
),
SizedBox(
width: 50.0,
),
RaisedButton(
child: Icon(Icons.image),
onPressed: () => getImageGallery(),
)
],
)
],
),
);
}
void uploadImage() async {
FormData formData = FormData.from({
"name_image": _txtNameImage.text,
"image": UploadFileInfo(File("$_image"), "image.jpg")
});
bool upload =
await api.uploadImage(data: formData, options: CrudComponent.options);
upload ? print('success') : print('fail');
}
getImageGallery() async {
var imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
setState(() {
_image = imageFile;
});
}
getImageCamera() async {
var imageFile = await ImagePicker.pickImage(source: ImageSource.camera);
setState(() {
_image = imageFile;
});
}
}

Answer 1

In Dio latest version, UploadFileInfo method has been replaced by MultipartFile class. And here the way how to use to post image, video or any file:
Future<String> uploadImage(File file) async {
String fileName = file.path.split('/').last;
FormData formData = FormData.fromMap({
"file":
await MultipartFile.fromFile(file.path, filename:fileName),
});
response = await dio.post("/info", data: formData);
return response.data['id'];
}

Answer 2

Even this question is asked a while ago, I believe the main issue is the size of image especially with Laravel.Flutter Image Picker library offers some functionalities to reduce the size of Image, I solved it with bellow steps:
Create a method to get the Image, I am using Camera to Capture the photo
Future getImage() async {
File _image;
final picker = ImagePicker();
var _pickedFile = await picker.getImage(
source: ImageSource.camera,
imageQuality: 50, // <- Reduce Image quality
maxHeight: 500, // <- reduce the image size
maxWidth: 500);
_image = _pickedFile.path;
_upload(_image);
}
Create _upload method to upload the photo, I am using Dio package Dio Package
void _upload(File file) async {
String fileName = file.path.split('/').last;
FormData data = FormData.fromMap({
"file": await MultipartFile.fromFile(
file.path,
filename: fileName,
),
});
Dio dio = new Dio();
dio.post("http://192.168.43.225/api/media", data: data)
.then((response) => print(response))
.catchError((error) => print(error));
}
On the server side, I am using Laravel Laravel, I handle the request as follow
public function store(Request $request)
{
$file = $request->file('file');
$extension = $file->getClientOriginalExtension();
$fullFileName = time(). '.'. $extension;
$file->storeAs('uploads', $fullFileName, ['disk' => 'local']);
return 'uploaded Successfully';
}

Answer 3

In the latest version of Dio :
It should look like this.
String fileName = imageFile.path.split('/').last;
FormData formData = FormData.fromMap({
"image-param-name": await MultipartFile.fromFile(
imageFile.path,
filename: fileName,
contentType: new MediaType("image", "jpeg"), //important
),
});
If without this line.
contentType: new MediaType("image", "jpeg")
Maybe it will cause an error: DioError [DioErrorType.RESPONSE]: Http status error [400] Exception
And get MediaType in this package: http_parser

Answer 4

The following code uploads multiple image files from a dio client to a golang server.
dioclient.dart
FormData formData = FormData.fromMap({
"name": "wendux",
"age": 25,
"other" : "params",
});
for (File item in yourFileList)
formData.files.addAll([
MapEntry("image_files", await MultipartFile.fromFile(item.path)),
]);
Dio dio = new Dio()..options.baseUrl = "http://serverURL:port";
dio.post("/uploadFile", data: formData).then((response) {
print(response);
}).catchError((error) => print(error));
golangServer.go
package main
import (
"fmt"
"io"
"net/http"
"os"
)
func uploadFile(w http.ResponseWriter, r *http.Request) {
err := r.ParseMultipartForm(200000)
if err != nil {
fmt.Fprintln(w, err)
return
}
formdata := r.MultipartForm
files := formdata.File["image_files"]
for i, _ := range files {
file, err := files[i].Open()
defer file.Close()
if err != nil {
fmt.Fprintln(w, err)
return
}
out, err := os.Create("/path/to/dir/" + files[i].Filename)
defer out.Close()
if err != nil {
fmt.Fprintf(w, "Unable to create the file for writing. Check your write access privilege")
return
}
_, err = io.Copy(out, file)
if err != nil {
fmt.Fprintln(w, err)
return
}
fmt.Fprintf(w, "Files uploaded successfully : ")
fmt.Fprintf(w, files[i].Filename+"\n")
}
}
func startServer() {
http.HandleFunc("/uploadFile", uploadFile)
http.ListenAndServe(":9983", nil)
}
func main() {
fmt.Println("Server starts!")
startServer()
}

Answer 5

I have found a solution, where I am uploading file a specific directory which is generated different camera package which requires file path to save jpg file in the provided path.
and I was fetching file name with path and passing to
DIO package
which was giving file length issue, to I have implemented below steps to solve the issue
get File Name With Full Path from directory
create a File from the Path
File(directoryFilePathWithExtension);
and pass File.path to the dio package
MultipartFile.fromFile(
File(directoryFilePathWithExtension).path,
filename: DateTime.now().toIso8601String(),
)

Answer 6

Use UploadFileInfo.fromBytes if you're working with memory images (The error message above shows that your file is invalid and doesn't exist).

Answer 7

Hi there are many issue in file upload
try in android Api 21 because it did not have android permissions if api is working in android api 21 then it wil also work on above versions.
you might not able to get the file in above android version
you just need
FormData formData = FormData.fromMap({
"av_document": await MultipartFile.fromFile(_filePath,filename:
_fileName),
});
to upload any file or image to server and one more thing to note
_filePaths = await FilePicker.getMultiFilePath(type: _pickingType,
fileExtension: _extension);
_fileName = _filePath.split('/').last
by using this process u can upload file or image to server

Answer 8

I am using
dio: ^4.0.6 (for uploading)
flutter_native_image: ^0.0.6+1 (for reducing image size)
to reduce file size
File? compressedFile = profileImage.value == null
? null
: await FlutterNativeImage.compressImage(
profileImage.value?.path ?? '',
quality: 20,
percentage: 60);
dio formData map
var formData = dio.FormData.fromMap({
"name": input['name']!.text,
"profile_pic": await dio.MultipartFile.fromFile(compressedFile.path),
"birth_date": input['dob']!.text,})
request ->
response = await _dio.post(url, data: formData);