上传 uiimage base64 编码

Posted 2023-02-23

【中文标题】上传 uiimage base64 编码

【英文标题】：Upload uiimage base64 encoded

【发布时间】：2016-11-30 16:38:46

【问题描述】：

我正在尝试上传 uiview（图表），但我通过电子邮件（来自 web 服务）收到空图片...android 正在运行

UIGraphicsBeginImageContext(self.view.bounds.size);
    self.view.layer.render(in: UIGraphicsGetCurrentContext()!)
    let screenShot = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    let jpegCompressionQuality: CGFloat = 1
    let imgData:Data = UIImageJPEGRepresentation(screenShot!,jpegCompressionQuality)!
    let lengthOfData = imgData.count
    let strBase64 = imgData.base64EncodedString(options: [])
    var request = URLRequest(url: URL(string: "http://myws.com/Chart.php")!)
        request.httpMethod = "POST"
    let postString = "data=\(strBase64)&email=[e-mail]"
    request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    request.addValue("\(lengthOfData)", forHTTPHeaderField: "Content-Length")
    request.httpBody = postString.data(using: String.Encoding.utf8)
    let task = URLSession.shared.dataTask(with: request)  data, response, error in
        guard let data = data, error == nil else 
            print("error=\(error)")
            return
        
        if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 
            print("statusCode \(httpStatus.statusCode)")
            print("response = \(response)")
        
        let responseString = String(data: data, encoding: .utf8)
        print("responseString = \(responseString)")
    
    task.resume()

【问题讨论】：

我认为您在这里遗漏了一些东西，例如为 httpheaderfield 设置值等。

【参考方案1】：

您的 ios 设备屏幕截图代码很好。我认为您将 UIImage 上传到服务器的发布请求缺少以下内容：

let imgData:NSData = data        
let lengthOfData = imgData.length
// ENCODINGDATA - whatever encoding your server wants here
request.addValue(ENCODINGDATA, forHTTPHeaderField: "Content-Type")
request.addValue("\(lengthOfData)", forHTTPHeaderField: "Content-Length")

除此之外，最好使用AlamoFire 来处理此类复杂的服务器任务。它使它更容易。可以这样实现

let imageData = UIPNGRepresentation(image)!

Alamofire.upload(imageData, to: "https://httpbin.org/post").responseJSON  response in

   debugPrint(response)

请随时提出修改建议以使其变得更好。如果我的回答有任何错误或缺点，请告诉我

【讨论】：

服务器收到的图片还是空的吗？

是的，使用UIImageWriteToSavedPhotosAlbum(screenShot!, nil, nil, nil) 图像可以正确进入手机存储

尝试使用Alamofire库上传图片并检查是否正在上传github.com/Alamofire/Alamofire

我使用了multipart 并且工作正常。谢谢！