无法在颤动中使用 dio 将图像上传到 api
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【中文标题】无法在颤动中使用 dio 将图像上传到 api【英文标题】:cannot upload image to api using dio in flutter 【发布时间】:2020-10-29 04:50:50 【问题描述】:我已经使用此代码从手机图库中选择图像,然后使用api将其上传到服务器,与其他数据一起,一切正常,所有数据都成功上传除了图像,我不知道是什么问题,特别是使用 Postman 时甚至成功上传的图像......这是我在颤动方面的代码:
TextEditingController namec = TextEditingController();
TextEditingController descc = TextEditingController();
TextEditingController pricec = TextEditingController();
File image;
String imgUrl;
getImage() async
var imageIns = await ImagePicker().getImage(source: ImageSource.gallery);
setState(()
image = File(imageIns.path);
imgUrl = imageIns.path;
);
/////////////////////
uploadImage() async
Dio dio = new Dio();
FormData formData = new FormData.fromMap(
"name" : namec.text,
"file" : image,
"desc" : descc.text,
"price" : pricec.text,
"cat" : widget.cid
);
var res = await dio.post(
"http://192.168.43.106:3000/service", data: formData);
final data = json.decode(res.data);
这在 node.js 端 (api) 中用于插入数据,包括图像:
insertServices: async (req, res)=>
// var path = req.file.path.replace(/\\/g, '/');
const result = await new SERVICES(
name : req.body.name,
file : req.file != null ? req.file.path.replace(/\\/g, '/') : "PATH",
desc : req.body.desc,
price : req.body.price,
cat : req.body.cat
).save()
res.json(
message: "success",
id : result._id,
name : result.name,
file : result.file,
desc : result.desc,
price : result.price
)
,
and i am using (multer) middle ware to upload the image,
当我尝试通过颤振应用上传图片时,这是服务器端的错误(邮递员没有错误):
::ffff:192.168.43.1 - - [08/Jul/2020:11:43:28 +0000] "GET /PATH HTTP/1.1" 404 143
(node:15612) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'path' of undefined
at insertServices (G:\eservices\logic\service.js:67:22)
at Layer.handle [as handle_request] (G:\eservices\node_modules\express\lib\router\layer.js:95:5)
at next (G:\eservices\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (G:\eservices\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (G:\eservices\node_modules\express\lib\router\layer.js:95:5)
at G:\eservices\node_modules\express\lib\router\index.js:281:22
at Function.process_params (G:\eservices\node_modules\express\lib\router\index.js:335:12)
at next (G:\eservices\node_modules\express\lib\router\index.js:275:10)
at Function.handle (G:\eservices\node_modules\express\lib\router\index.js:174:3)
at router (G:\eservices\node_modules\express\lib\router\index.js:47:12)
at Layer.handle [as handle_request] (G:\eservices\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (G:\eservices\node_modules\express\lib\router\index.js:317:13)
at G:\eservices\node_modules\express\lib\router\index.js:284:7
at Function.process_params (G:\eservices\node_modules\express\lib\router\index.js:335:12)
at next (G:\eservices\node_modules\express\lib\router\index.js:275:10)
at compression (G:\eservices\node_modules\compression\index.js:220:5)
(node:15612) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:15612) [DEP0018] DeprecationWa
【问题讨论】:
【参考方案1】:我有一个类似的应用程序可以从图库中上传图片,这是一个示例:
List<Asset> images = List<Asset>();
我使用multi_image_picker 一次选择多个图像,并在填写images
列表后使用此代码上传它们:
Dio dio = new Dio();
var items = [];
for (var item in images)
ByteData byteData = await item.getThumbByteData(800, 800);
List<int> imageData = byteData.buffer.asUint8List();
MultipartFile i =
MultipartFile.fromBytes(
imageData,
filename: item.name,
);
items.add(i);
FormData formData = new FormData.fromMap("userfile": items);
Response response = await dio.post(phpEndPoint, data: formData);
if(response.statusCode==200) //success
很遗憾,我不确定后端的代码是什么。
【讨论】:
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