private async Task <PPError> OpenAsyncCore(FileRef fileRef, FileOpenFlags openFlags, MessageLoop openLoop = null)
{
var tcs = new TaskCompletionSource <PPError>();
EventHandler <PPError> handler = (s, e) => { tcs.TrySetResult(e); };
try
{
HandleOpen += handler;
if (MessageLoop == null && openLoop == null)
{
Open(fileRef, openFlags);
}
else
{
Action <PPError> action = new Action <PPError>((e) =>
{
var result = (PPError)PPBFileIO.Open(this, fileRef, (int)openFlags,
new BlockUntilComplete()
);
tcs.TrySetResult(result);
}
);
InvokeHelper(action, openLoop);
}
return(await tcs.Task);
}
catch (Exception exc)
{
Console.WriteLine(exc.Message);
tcs.SetException(exc);
return(PPError.Aborted);
}
finally
{
HandleOpen -= handler;
}
}
internal static extern int open([MarshalAs(UnmanagedType.LPStr)] string pathname, FileOpenFlags flags);
/// <summary> /// Open() opens the specified regular file for I/O according to the given /// open flags, which is a bit-mask of the FileOpenFlags values. Upon /// success, the corresponding file is classified as "in use" by this FileIO /// object until such time as the FileIO object is closed or destroyed. /// </summary> /// <param name="fileRef">A FileRef instance</param> /// <param name="openFlags">A bit-mask of <code>FileOpenFlags</code> values.</param> /// <param name="openLoop">Optional MessageLoop instance that can be used to post the command to</param> /// <returns>Error code</returns> public Task <PPError> OpenAsync(FileRef fileRef, FileOpenFlags openFlags, MessageLoop openLoop = null) => OpenAsyncCore(fileRef, openFlags, openLoop);
/// <summary> /// Open() opens the specified regular file for I/O according to the given /// open flags, which is a bit-mask of the FileOpenFlags values. Upon /// success, the corresponding file is classified as "in use" by this FileIO /// object until such time as the FileIO object is closed or destroyed. /// </summary> /// <param name="fileRef">A FileRef instance</param> /// <param name="openFlags">A bit-mask of <code>FileOpenFlags</code> values.</param> /// <returns>Error code</returns> public PPError Open(FileRef fileRef, FileOpenFlags openFlags) => (PPError)PPBFileIO.Open(this, fileRef, (int)openFlags, new CompletionCallback(OnOpen));