如何在Dart/Flutter中将图像发送到api? [英] How to send an image to an api in dart/flutter?

问题描述

我看到了其他问题，但是那不是我想要的，我不想将图像上传到服务器，我不想转换为base64 ...

I saw other questions, but thats not what i want, i dont want to upload an image to a server, i dont want to convert to base64...

我只想以表单数据或其他形式发布文件，并获取返回的信息.

I only want to post a file in a form data or something else and get the returned info.

我有这个，但是没有用:

i have this, but has not work:

  void onTakePictureButtonPressed() {
    takePicture().then((String filePath) {
      if (mounted) {
        setState(() {
          imagePath = filePath;
          videoController?.dispose();
          videoController = null;
        });

        http.post('http://ip:8082/composer/predict', headers: {
          "Content-type": "multipart/form-data",
        }, body: {
          "image": filePath,
        }).then((response) {
          print("Response status: ${response.statusCode}");
          print("Response body: ${response.body}");
        });


        if (filePath != null) showInSnackBar('Picture saved to $filePath');
      }
    });
  }

推荐答案

最简单的方法是像 this中那样发布多部分请求.发布，然后将其发布到服务器.

The simplest method would be to post a multipart request like in this post and then post it to the server.

确保将它们导入文件的开头:

Make sure to import these in the beginning of the file:

import 'package:path/path.dart';
import 'package:async/async.dart';
import 'dart:io';
import 'package:http/http.dart' as http;
import 'dart:convert';

将此类添加到您的代码中的某个位置:

Add this class somewhere in your code:

upload(File imageFile) async {    
      // open a bytestream
      var stream = new http.ByteStream(DelegatingStream.typed(imageFile.openRead()));
      // get file length
      var length = await imageFile.length();

      // string to uri
      var uri = Uri.parse("http://ip:8082/composer/predict");

      // create multipart request
      var request = new http.MultipartRequest("POST", uri);

      // multipart that takes file
      var multipartFile = new http.MultipartFile('file', stream, length,
          filename: basename(imageFile.path));

      // add file to multipart
      request.files.add(multipartFile);

      // send
      var response = await request.send();
      print(response.statusCode);

      // listen for response
      response.stream.transform(utf8.decoder).listen((value) {
        print(value);
      });
    }

然后使用以下方式上传:

Then upload using:

upload(File(filePath));

在您的代码中:

void onTakePictureButtonPressed() {
    takePicture().then((String filePath) {
      if (mounted) {
        setState(() {
          imagePath = filePath;
          videoController?.dispose();
          videoController = null;
        });

       // initiate file upload
       Upload(File(filePath));

        if (filePath != null) showInSnackBar('Picture saved to $filePath');
      }
    });
  }

这篇关于如何在Dart/Flutter中将图像发送到api?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！