使用Alamofire和Multer上传文件(Uploading files with Alamofire and Multer)

 我正在尝试使用Alamofire将图像数据从iOS上传到带有Multer的Express服务器。 req.file未定义， req.body的格式为{ file: <bytes> } 。 没有错误消息，但文件未显示。 这是我的代码： 
 
var bodyParser = require('body-parser')
var multer = require('multer')

app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: false }))

app.post('/api/photos/upload', function(req, res) {
    var upload = multer({ dest: 'public/images/content/'}).single('file')
    upload(req, res, function(err) {
        if (err) {
            console.log("Error uploading file: " + err)
            return
        }

        // req.file = req.body
        console.log(req.body) // form fields
        console.log(req.file) // form file
    })

    res.json('yeah')
})
 
 在iOS上： 
 
let url = fullURL("api/photos/upload")

Alamofire.upload(.POST, url, multipartFormData: { multipartFormData in

        if let image = image {
            if let imageData = UIImageJPEGRepresentation(image, 0.5) {
                multipartFormData.appendBodyPart(data: imageData, name: "file")
            }
        }

        }, encodingCompletion: { encodingResult in

            switch encodingResult {
            case .Success(let upload, _, _):
                upload.responseJSON { response in

                    switch response.result {
                    case .Success:
                        print("success")
                    case .Failure(let error):
                        print(error)
                    }

                }
            case .Failure(let encodingError):
                print(encodingError)
            }

    })
 
 这让我困惑了好几个小时，非常感谢任何帮助！ 
 
 更新 HTML表单在Express端点上工作正常，因此它绝对是Alamofire发送请求的问题。 我尝试了一些使用Alamofire上传的例子，但他们都发送了相同的错误请求。 必须有一种方法可以与HTML表单进行相同的请求，但使用Alamofire。 
 
 另一个更新 
 我现在只是使用busboy-connect，它运行良好，并且具有更大的灵活性。 

I'm trying to upload image data from iOS using Alamofire to an Express server with Multer. req.file is undefined, and req.body is in the form { file: <bytes> }. There is no error message, but the file does not appear. Here is my code:
 
var bodyParser = require('body-parser')
var multer = require('multer')

app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: false }))

app.post('/api/photos/upload', function(req, res) {
    var upload = multer({ dest: 'public/images/content/'}).single('file')
    upload(req, res, function(err) {
        if (err) {
            console.log("Error uploading file: " + err)
            return
        }

        // req.file = req.body
        console.log(req.body) // form fields
        console.log(req.file) // form file
    })

    res.json('yeah')
})
 
On iOS:
 
let url = fullURL("api/photos/upload")

Alamofire.upload(.POST, url, multipartFormData: { multipartFormData in

        if let image = image {
            if let imageData = UIImageJPEGRepresentation(image, 0.5) {
                multipartFormData.appendBodyPart(data: imageData, name: "file")
            }
        }

        }, encodingCompletion: { encodingResult in

            switch encodingResult {
            case .Success(let upload, _, _):
                upload.responseJSON { response in

                    switch response.result {
                    case .Success:
                        print("success")
                    case .Failure(let error):
                        print(error)
                    }

                }
            case .Failure(let encodingError):
                print(encodingError)
            }

    })
 
This has puzzled me for hours, any help is greatly appreciated!
 
UPDATE An HTML form worked fine through the Express endpoint, so it's definitely a problem with the request Alamofire is sending. I've tried a bunch of examples of uploading with Alamofire, but they all send the same incorrect request. There must be a way to make the same request as an HTML form but with Alamofire.
 
ANOTHER UPDATE
 I'm now just using busboy-connect and it's working well, and with a lot more flexibility.

原文：https://stackoverflow.com/questions/35532581