private async Task <FileInfo> QueryAsyncCore(MessageLoop messageLoop = null)
{
var tcs = new TaskCompletionSource <FileInfo>();
EventHandler <FileInfo> handler = (s, e) => { tcs.TrySetResult(e); };
try
{
HandleQuery += handler;
if (MessageLoop == null && messageLoop == null)
{
Query();
}
else
{
Action <PPError> action = new Action <PPError>((e) =>
{
var fileInfo = new PPFileInfo();
var result = (PPError)PPBFileRef.Query(this, out fileInfo,
new BlockUntilComplete()
);
tcs.TrySetResult(new FileInfo(result, fileInfo));
}
);
InvokeHelper(action, messageLoop);
}
return(await tcs.Task);
}
catch (Exception exc)
{
Console.WriteLine(exc.Message);
tcs.SetException(exc);
return(new FileInfo(PPError.Aborted, new PPFileInfo()));
}
finally
{
HandleQuery -= handler;
}
}
/// <summary>
/// Query() queries info about a file or directory. You must have access to
/// read this file or directory if it exists in the external filesystem.
/// </summary>
/// <returns>Error code</returns>
public PPError Query()
{
var ficb = new CompletionCallbackWithOutput <PPFileInfo>(OnQuery);
return((PPError)PPBFileRef.Query(this, out ficb.OutputAdapter.output, ficb));
}