在服务器上上传不工作的多功能图像

Question

我试图上传多个图像到服务器，但总是遇到问题。我也尝试了一些其他的解决方案，但没有奏效。

saveImages() async {
    // string to uri
    Uri uri = Uri.parse('http://100.0.50.10:8000/API/AddImageCarSale/Post');

// create multipart request
    MultipartRequest request = http.MultipartRequest("POST", uri);
    if (images != null) {
      for (var i = 0; i < images.length; i++) {
        ByteData byteData = await images[i].getByteData();
        List<int> imageData = byteData.buffer.asUint8List();

        MultipartFile multipartFile = MultipartFile.fromBytes(
          'photo', //key of the api
          imageData,
          filename: images[i].name,
          contentType: MediaType("image",
              "jpg"), //this is not nessessory variable. if this getting error, erase the line.
        );
        request.fields['PhoneNo'] = '1122';
        request.fields['VehicleNo'] = '1234';
// add file to multipart
        request.files.add(multipartFile);
// send
        var response = await request.send();
      }
    }
  }

我的错误是

错误:flutter/lib/ui/ui_dart_state.cc(166)未处理的异常:错误状态:无法完成最终的请求。E/ BaseRequest.finalize (11521)：#0 BaseRequest.finalize(包装:http/src/base_request.dart:104:20)E/ MultipartRequest.finalize (11521)：#1 MultipartRequest.finalize IOClient.send E/颤振(11521)：#2 IOClient.send(包装:http/src/io_client.dart:28:26)E/MultipartRequest.finalize (11521)：#3 BaseRequest.send (软件包:http/src/base_BaseRequest.send)(package:Autolog/pages/buySell/sellerForm.dart:361:38) E/request.dart:119:35 (11521)：E/颤振(11521)：#5 _SellerFormState._buildBody。(package:Autolog/pages/buySell/sellerForm.dart:754:25) E/颤振(11521)：#6 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19) E/颤振(11521)：#7 _InkResponseState.build。(package:flutter/src/material/ink_well.dart:1098:38) E/颤振(11521)：#8 (package:flutter/src/gestures/recognizer.dart:184:24) E/颤振(11521)：#9 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11) E/颤振(11521)：#10 BaseTapGestureRecognizer._checkUp (包装:颤振/src/手势/踢踏舞:284:5)11521)：#11 (package:flutter/src/gestures/arena.dart:158:27) (package:flutter/src/gestures/binding.dart:224:20) E/ GestureArenaManager.sweep (11521)：#13 GestureBinding.handleEvent GestureBinding.dispatchEvent E/GestureBinding.handleEvent (11521)：#14 GestureBinding.dispatchEvent(包装:GestureArenaManager.sweep/src/手势/binding.dart:GestureArenaManager.sweep/src/手势/binding.dart：E/颤振(11521)：#15 (package:flutter/src/gestures/binding.dart:158:7) E/颤振(11521)：#16 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7) E/颤振(11521)：#17 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7) E/颤振(11521)：#18 _rootRunUnary (飞镖：异步/飞镖:1206:13)E/颤振(11521)：#19 _CustomZone.runUnary (飞镖:异步/飞镖:1100:19)E/颤振(11521)：#20 _CustomZone.runUnaryGuarded (飞镖:异步/飞镖:1005:7)E/颤振(11521)：#21 _invoke1 (飞镖:ui/hooks.dart:267:10)E/颤振(11521)：#22 _dispatchPointerDataPacket (飞镖:ui/hooks.dart:176:5)E/颤振(11521)：

Answer 1

在完成多部分请求时，您需要为每个循环创建一个新的多部分请求。尝试这个修改，它应该可以工作。

    // string to uri
    Uri uri = Uri.parse('http://100.0.50.10:8000/API/AddImageCarSale/Post');

// create multipart request
    if (images != null) {
      for (var i = 0; i < images.length; i++) {
        MultipartRequest request = http.MultipartRequest("POST", uri);
        ByteData byteData = await images[i].getByteData();
        List<int> imageData = byteData.buffer.asUint8List();

        MultipartFile multipartFile = MultipartFile.fromBytes(
          'photo', //key of the api
          imageData,
          filename: images[i].name,
          contentType: MediaType("image",
              "jpg"), //this is not nessessory variable. if this getting error, erase the line.
        );
        request.fields['PhoneNo'] = '1122';
        request.fields['VehicleNo'] = '1234';
// add file to multipart
        request.files.add(multipartFile);
// send
        var response = await request.send();
      }
    }
  }