/// <summary>
/// Get file data of a specified remote file in FlashAir card and save it in local folder.
/// </summary>
/// <param name="remoteFilePath">Remote file path</param>
/// <param name="localFilePath">Local file path</param>
/// <param name="size">File size provided by FlashAir card</param>
/// <param name="itemDate">Date provided by FlashAir card</param>
/// <param name="canReadExif">Whether can read Exif metadata from the file</param>
/// <param name="progress">Progress</param>
/// <param name="token">CancellationToken</param>
/// <param name="card">FlashAir card information</param>
/// <returns>Byte array of the file</returns>
internal static async Task <byte[]> GetSaveFileAsync(string remoteFilePath, string localFilePath, int size, DateTime itemDate, bool canReadExif, IProgress <ProgressInfo> progress, CancellationToken token, CardInfo card)
{
if (String.IsNullOrWhiteSpace(remoteFilePath))
{
throw new ArgumentNullException("remoteFilePath");
}
if (String.IsNullOrWhiteSpace(localFilePath))
{
throw new ArgumentNullException("localFilePath");
}
var remotePath = ComposeRemotePath(FileManagerCommand.None, remoteFilePath);
try
{
using (var client = new HttpClient()
{
Timeout = timeoutLength
})
{
var bytes = await DownloadBytesAsync(client, remotePath, size, progress, token, card).ConfigureAwait(false);
using (var fs = new FileStream(localFilePath, FileMode.Create, FileAccess.Write))
{
await fs.WriteAsync(bytes, 0, bytes.Length, token).ConfigureAwait(false);
}
// Conform date of copied file in local folder to that of original file in FlashAir card.
var localFileInfo = new FileInfo(localFilePath);
localFileInfo.CreationTime = itemDate; // Creation time
localFileInfo.LastWriteTime = itemDate; // Last write time
// Overwrite creation time of copied file by date of image taken from Exif metadata.
if (canReadExif)
{
var exifDateTaken = await ImageManager.GetExifDateTakenAsync(bytes);
if (exifDateTaken != DateTime.MinValue)
{
localFileInfo.CreationTime = exifDateTaken;
}
}
return(bytes);
}
}
catch
{
Debug.WriteLine("Failed to get and save a file.");
throw;
}
}
/// <summary>
/// Gets file data of a specified remote file in FlashAir card and save it in local folder.
/// </summary>
/// <param name="client">HttpClient</param>
/// <param name="remoteFilePath">Remote file path</param>
/// <param name="localFilePath">Local file path</param>
/// <param name="size">File size provided by FlashAir card</param>
/// <param name="itemDate">Date provided by FlashAir card</param>
/// <param name="canReadExif">Whether can read Exif metadata from the file</param>
/// <param name="progress">Progress</param>
/// <param name="card">FlashAir card information</param>
/// <param name="cancellationToken">CancellationToken</param>
/// <returns>Byte array of file</returns>
internal static async Task <byte[]> GetSaveFileAsync(HttpClient client, string remoteFilePath, string localFilePath, int size, DateTime itemDate, bool canReadExif, IProgress <ProgressInfo> progress, CardInfo card, CancellationToken cancellationToken)
{
if (string.IsNullOrWhiteSpace(remoteFilePath))
{
throw new ArgumentNullException(nameof(remoteFilePath));
}
if (string.IsNullOrWhiteSpace(localFilePath))
{
throw new ArgumentNullException(nameof(localFilePath));
}
var remotePath = ComposeRemotePath(FileManagerCommand.None, remoteFilePath);
byte[] bytes = null;
try
{
bytes = await DownloadBytesAsync(client, remotePath, size, progress, card, cancellationToken).ConfigureAwait(false);
}
catch
{
Debug.WriteLine("Failed to get a file.");
throw;
}
int retryCount = 0;
while (true)
{
try
{
using (var fs = new FileStream(localFilePath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite))
{
var creationTime = itemDate;
var lastWriteTime = itemDate;
// Overwrite creation time by date of image taken from Exif metadata.
if (canReadExif)
{
var exifDateTaken = await ImageManager.GetExifDateTakenAsync(bytes, DateTimeKind.Local);
if (exifDateTaken != default(DateTime))
{
creationTime = exifDateTaken;
}
}
FileTime.SetFileTime(fs.SafeFileHandle, creationTime: creationTime, lastWriteTime: lastWriteTime);
await fs.WriteAsync(bytes, 0, bytes.Length, cancellationToken).ConfigureAwait(false);
}
return(bytes);
}
catch (IOException) when(++retryCount < MaxRetryCount)
{
// Wait interval before retry.
if (TimeSpan.Zero < _retryInterval)
{
await Task.Delay(_retryInterval, cancellationToken);
}
}
catch
{
Debug.WriteLine("Failed to save a file.");
throw;
}
}
}
