Question

我正在使用Swift 4开发iOS应用程序。

我需要从服务器上的应用程序上传图像，以便稍后将其保存到数据库中。我为此寻找解决方案;首先我使用了base64Encoding，将图像转换为String并将其存储在数据库中，然后当我想上传此图像时，我使用base64解码对其进行解码，但是，我得到了一个黑色image。

因此，我尝试使用以下代码在服务器上上传图像：

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

@IBOutlet var image: UIImageView!

override func viewDidLoad() {
    super.viewDidLoad()

}
@IBAction func selectPicture(_ sender: AnyObject) {

    let ImagePicker = UIImagePickerController()
    ImagePicker.delegate = self
    ImagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary

    self.present(ImagePicker, animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

    image.image = info[UIImagePickerControllerOriginalImage] as? UIImage
    self.dismiss(animated: true, completion: nil)
}
@IBAction func upload_request(_ sender: AnyObject) {
    UploadRequest()
}
func UploadRequest()
{
    let url = URL(string: "http://192.168.101.13/upload.php")

    let request = NSMutableURLRequest(url: url!)
    request.httpMethod = "POST"

    let boundary = generateBoundaryString()


    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")

    if (image.image == nil)
    {
        return
    }

    let image_data = UIImagePNGRepresentation(image.image!)


    if(image_data == nil)
    {
        return
    }
    let body = NSMutableData()

    let fname = "test.png"
    let mimetype = "image/png"


    body.append("--\(boundary)\r\n".data(using: String.Encoding.utf8)!)
    body.append("Content-Disposition:form-data; name=\"test\"\r\n\r\n".data(using: String.Encoding.utf8)!)
    body.append("hi\r\n".data(using: String.Encoding.utf8)!)
    body.append("--\(boundary)\r\n".data(using: String.Encoding.utf8)!)
    body.append("Content-Disposition:form-data; name=\"file\"; filename=\"\(fname)\"\r\n".data(using: String.Encoding.utf8)!)
    body.append("Content-Type: \(mimetype)\r\n\r\n".data(using: String.Encoding.utf8)!)
    body.append(image_data!)
    body.append("\r\n".data(using: String.Encoding.utf8)!)

    body.append("--\(boundary)--\r\n".data(using: String.Encoding.utf8)!)


    request.httpBody = body as Data

    let session = URLSession.shared


    let task = session.dataTask(with: request as URLRequest, completionHandler: {
        (
        data, response, error) in

        guard ((data) != nil), let _:URLResponse = response, error == nil else {
            print("error")
            return
        }

        if let dataString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
        {
            print(dataString)
        }

    }) 

    task.resume()

}
func generateBoundaryString() -> String
{
    return "Boundary-\(UUID().uuidString)"
}

}

和php代码：

if (move_uploaded_file($_FILES['file']['tmp_name'], "image.png")) {
echo "File uploaded: ".$_FILES["file"]["name"];}

但是我收到了这些警告，图片没有上传到服务器上：

move_uploaded_file(image.png): failed to open stream: Permission denied in /Applications/XAMPP/xamppfiles/htdocs/upload.php
move_uploaded_file(): Unable to move '/Applications/XAMPP/xamppfiles/temp/phprJ2M6j' to 'image.png' in /Applications/XAMPP/xamppfiles/htdocs/upload.php

如何在服务器上上传图像成功。

Answer 1

以下代码对我来说适用于自定义图片名称`

    func HITtheSERVER(imageData:Data) {
         let formatter = DateFormatter()
                formatter.dateFormat = "yyyyMMdd_HHmmss"
                  let stringOfDateTimeStamp = formatter.string(from: Date())
           //        print("Date time stamp String: \(stringOfDateTimeStamp)")
            let remoteName = "IMG_\(stringOfDateTimeStamp)"+".png"
    let request = NSMutableURLRequest(url: myUrl!)
    request.httpMethod = "POST"
    let boundary = generateBoundaryString()

    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")

    var body = Data()
    let fname = remoteName
    let mimetype = "image/png"

    body.append("--\(boundary)\r\n".data(
        using: String.Encoding.utf8,
    allowLossyConversion: false)!)
    body.append("Content-Disposition:form-data; name=\"test\"\r\n\r\n".data(
        using: String.Encoding.utf8,
    allowLossyConversion: false)!)
    body.append("hi\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
    body.append("--\(boundary)\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
    body.append("Content-Disposition:form-data; name=\"myFile\"; filename=\"\(fname)\"\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)

    body.append("Content-Type: \(mimetype)\r\n\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)

    body.append(imageData)
    body.append("\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
    body.append("--\(boundary)--\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
    request.setValue(String(body.count), forHTTPHeaderField: "Content-Length")

    request.httpBody = body


    let session = URLSession.shared

    let task = session.dataTask(with: request as URLRequest) {
        (
        data, response, error) in

        guard let _:NSData = data as NSData?, let _:URLResponse = response, error == nil else {
            print("error")
            return
        }

        let dataString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
        print(dataString as Any)

    }

    task.resume()



}
func generateBoundaryString() -> String
   {
    return "Boundary-\(NSUUID().uuidString)"
   }`

Answer 2

如果我们有多个dataType（例如Image和String）以及正文。在这种情况下，以下代码会有所帮助。

`

override func viewDidLoad() {
    super.viewDidLoad()
    let imageData = image.jpegData(compressionQuality: 0.1)
    
    let formatter = DateFormatter()
                formatter.dateFormat = "yyyyMMddHHmmss"
             let stringOfDateTimeStamp = formatter.string(from: Date())
            let devicekey =  UIDevice.current.identifierForVendor?.uuidString

                   //        print("Date time stamp String: \(stringOfDateTimeStamp)")
            let remoteName = "IMG\(stringOfDateTimeStamp)"+".jpg"



     let parameters = [
       [
         "key": "myFile",
         "src": imageData,
         "type": "image/png"
       ],
       [
         "key": "key",
         "value": "7d67b170-199c-4436-ad9d-cd5daf38f905",
         "type": "text"
       ]] as [[String : Any]]

     let boundary = "Boundary-\(UUID().uuidString)"
    
     var body = Data()
     var error: Error? = nil
     for param in parameters {
       if param["disabled"] == nil {
         let paramName = param["key"]!
         body.append("--\(boundary)\r\n".data(
             using: String.Encoding.utf8,
         allowLossyConversion: false)!)
        
         body.append("Content-Disposition:form-data; name=\"\(paramName)\"".data(
             using: String.Encoding.utf8,
         allowLossyConversion: false)!)
         let paramType = param["type"] as! String
         if paramType == "text" {
           let paramValue = param["value"] as! String
            
           body.append("\r\n\r\n\(paramValue)\r\n".data(
               using: String.Encoding.utf8,
           allowLossyConversion: false)!)
         } else {
           let paramSrc = param["src"] as! Data
            let mimiType = param["type"]
            body.append("; filename=\"\(remoteName)\"\r\n".data(
                using: String.Encoding.utf8,
            allowLossyConversion: false)!)
            
           body.append("Content-Type: \(mimiType!)\r\n\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
            
            body.append(paramSrc)
            body.append("\r\n".data(using: String.Encoding.utf8,allowLossyConversion: false)!)
          
         }
       }
     }
    body.append("--\(boundary)--\r\n".data(
                      using: String.Encoding.utf8,
                  allowLossyConversion: false)!)
    
        let request = NSMutableURLRequest(url: myUrl!)
           request.httpMethod = "POST"
           request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
           
           request.setValue(String(body.count), forHTTPHeaderField: "Content-Length")

           request.httpBody = body
           
           
           let session = URLSession.shared

           let task = session.dataTask(with: request as URLRequest) {
         (
         data, response, error) in
         
         guard let _:NSData = data as NSData?, let _:URLResponse = response, error == nil else {
             print("error\(error!)")
             return
         }
         
         let dataString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
         print(dataString as Any)
         
     }


     task.resume()
   
    
}

func generateBoundaryString() -> String
{
return "Boundary-\(NSUUID().uuidString)"}

`

在服务器Swift 4上上传图像

2 个答案: