I hope you found this tutorial useful and I invite you to tell me what topic I should cover next. By opening the uploads subdirectory in the directory where you have the back-end Node script, you'll find a file called image_picker.jpg. After that, press the + icon, pick an image, and you'll see the Node script will print out a message like Received image_picker.jpg.For example, if your PC's IP is 192.168.1.2, you'd type in. Then, fire up the Flutter app on a phone/emulator, get your PC's local IP (if the phone is connected to the same local network or it's running on an emulator) to substitute to in which is what you need to type into the TextField in the app.To use the example code, start the server by running node index.js. On lines 22 and 23 we start the server on the port specified by the PORT environment variable or on port 3000 if no port was specified using environment variables. If an error happens (often because no file name was specified, on line 17) we will inform the sender of that. When this is finished (lines 13 to 16) we delete ( unlinkSync) the temporary file created by Multer (which has a name that ensures there aren't two files with the same name but doesn't even keep the same extension as the original file) and send back a response saying everything was OK. It does that on lines 10 to 16 by creating, as is done using Node's fs interface, streams (much like FILE* variables in C) that allow our script to read from an input file ( is the path Multer saved the received file to) and write to an output file (using the passed, which is the filename specified in the POST request by the sender, which is our Flutter app). The callback prints to the console the name of the file that was received (on line 9), it then renames the file to the original file name. All you need to know for this section is that we've got this at the top of our main.dart: This means we're not going to worry about dependencies in this section. The next section is going to focus on how to build an app that lets the user insert the URL to which to send the request, pick an image and send it to the server, getting back the status of the request. This little section is going to focus on one thing: creating a function that, given a file path and an URL, is able to send that file to that URL with that multipart POST request. Making Multi-Part POST Requests with Flutter's HTTP Library With a multipart POST request, you can also include files with binary content (images, various documents, etc.), in addition to the regular text values. Usually, the body of a POST request is made of textual key-value pairs. You can find all of the code contained in this example in this GitHub repository. A multipart request is an HTTP request that HTTP clients construct to send files and data over to a Server. My blog is here for those who need more than that, and the first topic I'm going to cover is how to upload a file using a multi-part/form-data POST request. This post explains how to build a flutter application with the ability to select the image from the gallery using ImagePicker and upload images to the web server using a multi-part post request. Import 'package:http_parser/http_parser.My Flutter book is pretty light on advanced HTTP networking topics, focusing instead on giving a more well-rounded approach that, when it comes to networking, explains how to use the http networking package for basic requests, shows an example of an app that makes GET requests, and then goes a bit more specific with Firebase. Import 'package:image_picker/image_picker.dart' Please write in details, i am freshman in coding. How to change this code that user can select and upload multiple pictures or is there any other alternatives. I found little application but it selects and upload only one picture. I tried to find how to select and upload multiple images in flutter but most of the plugins are not working or I did not understand them well.
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