how do I check the file size of a video in flutter before uploading

问题

I want to upload a video file to my cloud storage but I want to check the size of the video file before I upload. how to achieve this

回答1:

If you have the path of the file, you can use dart:io

var file = File('the_path_to_the_video.mp4');

You an either use:

print(file.lengthSync()); 

or

print (await file.length());

---

Note: The size returned is in bytes.

回答2:

If you have file object then you can call length() on the file object.

int fileLength = await file.length();

length() returns a Future<int> that completes with the length in bytes.

来源：https://stackoverflow.com/questions/53036328/how-do-i-check-the-file-size-of-a-video-in-flutter-before-uploading