使用EXIF数据从DJI无人机检索图像

问题描述

我在iOS中使用DJISDK从飞机上下载图片.

I'm using the DJISDK in iOS to download pictures from the aircraft.

我正在使用PlaybackManager类中的downloadSelectedFiles方法.

I'm using the downloadSelectedFiles method from PlaybackManager class.

这是我的流程回调:

process: { (data, error) in
    if data != nil{
        if self.downloadedImageData != nil{
            self.downloadedImageData!.append(data!)
        }else{
            self.downloadedImageData = data!
        }

    }
}

这是文件补全回调:

fileCompletion: {
    self.downloadedFilesCount += 1
    let image = UIImage(data: self.downloadedImageData!)
    if let img = image {
        self.downloadedImagesArray?.append(img)
    }
    self.downloadedImageData = nil         
}

我正在正确检索图像，但没有EXIF数据.如何获取该信息并将其添加到图像?我已经下载并尝试了iOS-MediaManagerDemo，这是同一件事，下载图像但没有exif数据，但是官方DJI Go应用会检索所有信息，因此必须有某种方法可以做到.

I'm correctly retrieving the image but without the EXIF data. How can I get that info and add it to the image?I already downloaded and tried the iOS-MediaManagerDemo and it's the same thing, downloads the image but without the exif data but the official DJI Go app retrieves all the info so there´s must be some way to do it.

推荐答案

还有一个他们论坛中的类似问题，其中包含空白的元数据和downloadSelectedFilesWithPreparation.创建帖子的用户还找到了解决方案:

There's also a similar issue in their forums regarding empty metadata and downloadSelectedFilesWithPreparation. The user that created the post also found a solution:

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尝试使用 fetchFileDataWithOffset:updateQueue:updateBlock (在Swift中将其称为fetchFileData(with:updateQueue:updateBlock))

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Try using fetchFileDataWithOffset:updateQueue:updateBlock (it will be called fetchFileData(with:updateQueue:updateBlock) in Swift)

示例代码(objc):此处

Sample code (objc): here

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