在颤动中将图像上传到服务器时出错

如何解决在颤动中将图像上传到服务器时出错

我正在通过从画廊或相机中挑选图片将图像上传到服务器。但是我从服务器端获取文件未找到错误意味着文件路径变为空白或存在另一个问题。我也在使用 image_cropper 裁剪图像，我还发送同样位于下方的标题 - 图像已成功上传到邮递员表单数据

void _showPickOptionsDialog(BuildContext context) {
    showDialog(
      context: context,builder: (context) => AlertDialog(
        content: Column(
          mainAxisSize: MainAxisSize.min,children: <Widget>[
            ListTile(
              title: Text("Pick from Gallery"),onTap: () {
                _loadPicker(ImageSource.gallery);
              },),ListTile(
              title: Text("Take a picture"),onTap: () {
                _loadPicker(ImageSource.camera);
              },)
          ],);
  }

    _loadPicker(ImageSource source) async {
     _pickedImage = await ImagePicker.pickImage(source: source);
    if (_pickedImage != null) {
      _cropImage(File(_pickedImage.path));

    }
    Navigator.pop(context);
  }

    _cropImage(File picked) async {
    File cropped = await ImageCropper.cropImage(
      androidUiSettings: AndroidUiSettings(
        statusBarColor: Colors.red,toolbarColor: Colors.red,toolbarTitle: "Crop Image",toolbarWidgetColor: Colors.white,sourcePath: picked.path,aspectRatioPresets: [
        CropAspectRatioPreset.original,CropAspectRatioPreset.ratio16x9,CropAspectRatioPreset.ratio4x3,CropAspectRatioPreset.ratio3x2,],maxWidth: 512,maxHeight: 512,);
    if (cropped != null) {
      setState(() {
        _pickedImage = cropped;
        print("profilePath" + _pickedImage.toString());
        uploadFile(_pickedImage.path);
        // uploadImage(_pickedImage.path);
      });
    }
  }

api 调用

Future<ProfileUpdateModel> uploadFile(file) async {
    var postUri = Uri.parse(urlProfileUpdate);
    var request = new http.MultipartRequest("POST",postUri);

    ProgressDialog pr = ProgressDialog(context);
    pr.style(
        message: 'Uploading',borderRadius: 10.0,backgroundColor: Colors.white,progressWidget: CircularProgressIndicator(),elevation: 10.0,progressTextStyle: TextStyle(
            color: Colors.black,fontSize: 13.0,fontWeight: FontWeight.w400),messageTextStyle: TextStyle(
            color: Colors.black,fontSize: 18.0,fontWeight: FontWeight.w600));

    await pr.show();

    request.fields['user_id'] = '1';
    // request.files.add(new http.MultipartFile.fromBytes('file',await File.fromRawPath(file).readAsBytes(),//     contentType: new MediaType('image',".jpg")));

    request.files.add(http.MultipartFile('file',File(file).readAsBytes().asStream(),File(file).lengthSync(),filename: file.split("/").last));

    request.headers.addAll(BaseURLHeaders().getHeader2());

    var streamedResponse = await request.send();
    var response = await http.Response.fromStream(streamedResponse);
    print("responcebodyprofile " + response.body);
    if(response.statusCode == 200){
      pr.hide();
      var res = json.decode(response.body);
      ProfileUpdateModel _userProfileUpdateModel = ProfileUpdateModel.fromJson(res);
      if(_userProfileUpdateModel.success == 1){
        CustomClass().makeToast(_userProfileUpdateModel.message,context);
        getData();

      }
    }else{
      pr.hide();
    }
  }

标题

Map getHeader2() {
    final Map<String,String> headers = {
      "Content-type": "multipart/form-data","api_key": "demo","secret_key": "demo",};
    return headers;
  }