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我目前正在创建一个应用程序,在该应用程序中,我将使用multer中间件将图像从iOS设备发送到我的expressjs服务器。我有服务器端设置,但我相信我在客户端有一个错误,因为我无法让我的POST请求正常工作。这是我的swift代码。将图像上传到Node.js express服务器Swift
class func changeChannelImage(handle: String, imageURL: URL, completionHandler: @escaping (Int?, Error?) -> Void){
let baseURL = "http://10.0.0.220:3000/channel/channelImage?handle=\(handle)"
func createRequestBodyWith(parameters:[String:NSObject], boundary:String) -> Data{
var body = Data()
for (key, value) in parameters {
body.appendString(string: "--\(boundary)\r\n")
body.appendString(string: "Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
body.appendString(string: "\(value)\r\n")
}
body.appendString(string: "--\(boundary)\r\n")
var mimetype = "image/png"
let defFileName = "channelImage.png"
print(imageURL.absoluteString)
do {
var data = try Data(contentsOf: imageURL) //Image file URL in device's directory
var image = UIImage(data: data)
let imageData = UIImagePNGRepresentation(image!)
body.appendString(string: "Content-Disposition: form-data; filename=\"\(defFileName)\"\r\n")
print("Content-Type: \(mimetype)\r\n\r\n")
body.appendString(string: "Content-Type: \(mimetype)\r\n\r\n")
body.append(imageData!)
body.appendString(string: "\r\n")
body.appendString(string: "--\(boundary)--\r\n")
}
catch {
print(error.localizedDescription)
}
return body
}
func generateBoundaryString() -> String {
return "Boundary-\(NSUUID().uuidString)"
}
var request = URLRequest(url: URL(string: baseURL)!)
request.httpMethod = "POST"
let boundary = generateBoundaryString()
request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
request.httpBody = createRequestBodyWith(parameters: [:], boundary: generateBoundaryString())
let session = URLSession.shared
let task = session.dataTask(with: request) { (data, response, error) in
if error == nil {
let res = response as! HTTPURLResponse
let code = res.statusCode
if code != 200 {
print(String(data: data!, encoding: .utf8))
}
DispatchQueue.main.async {
completionHandler(code, nil)
}
}
else {
print(error!)
DispatchQueue.main.async {
completionHandler(0, error)
}
}
}
task.resume()
}
有没有人有任何想法为什么图像文件不能被服务器正确读取?任何帮助,将不胜感激。