我目前正在尝试使用移动SDK访问DJI Phantom 4拍摄的最后一张图像。我查看了：How to programmatically download Images from drone using the IOS DJI-SDK，它很有帮助，但是，在.refreshFileList（）调用中，抛出了一个错误，指出“此过程的执行已超时（代码-1003）”。
任何帮助将不胜感激！这是我的代码：
/***** Setup Camera *****/
// get current product
guard let drone = DJISDKManager.product() else {
print("Product is connected but DJISDKManager.product is nil when attempting to download media")
return
}
// Get camera on drone
guard let camera: DJICamera = drone.camera else {
print("Unable to detect Camera in initDownload()")
return
}
print("Successfully detected the camera")
// take picture when project starts
camera.startShootPhoto(completion: { (error) in
if (error != nil) {
print("Shoot photo error: \(error.debugDescription)")
}
})
/***** Get Last Picture *****/
// check if we can download images with the product
if !camera.isMediaDownloadModeSupported() {
print("Product does not support media download mode")
return
}
print("before set mode...")
// switch camera mode to allow for media downloads
camera.setMode( .mediaDownload, withCompletion: {(error) in
print("in set mode...")
if error != nil {
print(("\(error!.localizedDescription)"))
} else {
// get the media manager from the drone to gain access to the files
let manager = camera.mediaManager!
manager.refreshFileList(of: DJICameraStorageLocation.sdCard, withCompletion: { (error) in
print("in refresh file list...")
if error != nil {
///////TIMES OUT HERE/////////
print("Refresh error State: \(manager.sdCardFileListState.rawValue)")
print("Error refreshing list: \(error!.localizedDescription)")
}else {
print("Refreshed file list")
print("No error State: \(manager.sdCardFileListState.rawValue)")
// get list of files
guard let files = manager.sdCardFileListSnapshot() else {
print("No files to download")
return
}
print("There are files to download.. Beginning Download")
print(("files \(files.count)"))
}
}) // end of file-refresh block
} // end of if else
})// end of camera setMode block
最佳答案
代码的问题在于，您在更改模式之前没有等待startShootPhoto操作的完成。这可能是导致您出错的原因。
这是您功能的工作版本
func shootPhoto() {
guard let drone = (DJISDKManager.product() as? DJIAircraft) else {
print("Product is connected but DJISDKManager.product is nil when attempting to download media")
return
}
// Get camera on drone
guard let camera: DJICamera = drone.camera else {
print("Unable to detect Camera in initDownload()")
return
}
print("Successfully detected the camera")
// take picture when project starts
camera.startShootPhoto(completion: { (error) in
if (error != nil) {
print("Shoot photo error: \(error.debugDescription)")
}
else {
self.getLastImage(camera: camera)
}
})
}
func getLastImage(camera: DJICamera) {
/***** Get Last Picture *****/
// check if we can download images with the product
if !camera.isMediaDownloadModeSupported() {
print("Product does not support media download mode")
return
}
print("before set mode...")
let retry = RetryManager() // Run the same block multiple times if the command has an error
// switch camera mode to allow for media downloads
retry.runBlock(withRetries: 5) {
camera.setMode( .mediaDownload, withCompletion: {(error) in
print("in set mode...")
if error != nil {
print(("\(error!.localizedDescription)"))
} else {
retry.stop()
// get the media manager from the drone to gain access to the files
let manager = camera.mediaManager!
manager.refreshFileList(of: DJICameraStorageLocation.sdCard, withCompletion: { (error) in
print("in refresh file list...")
if error != nil {
///////TIMES OUT HERE/////////
print("Refresh error State: \(manager.sdCardFileListState.rawValue)")
print("Error refreshing list: \(error!.localizedDescription)")
}else {
print("Refreshed file list")
print("No error State: \(manager.sdCardFileListState.rawValue)")
// get list of files
guard let files = manager.sdCardFileListSnapshot() else {
print("No files to download")
return
}
print("There are files to download.. Beginning Download")
print(("files \(files.count)"))
}
}) // end of file-refresh block
} // end of if else
retry.proceed()
})// end of camera setMode block
}
}
该代码对我有用，这是重试管理器的要点，因为前几次尝试均失败，所以我不得不使用它。 https://gist.github.com/justinmiller62/4c76d9704524fd8aaa60e166a5cccea8
另外，如果您希望代码内联而不是像这样嵌套，则可以使用信号量等待上一个功能完成。
关于ios - DJI SDK获取最后一张图片，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/50957589/