我一直在使用以下代码将文件上传到我的服务器,它可以完成工作,但我想监控上传进度百分比,并更新用户界面以反映进度。
uploadFile({File imageFile, String refCode}) 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://-------------/api/FilesUploadB/?refCode=$refCode');
// 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();
// listen for response
response.stream.transform(utf8.decoder).listen((value) {
print(value);
});
//return response.
}
注意,在监听器中的value
参数将获取来自服务器端WebAPI的最终返回值。如何实现呢?