private async Task <FileIOResult> WriteAsyncCore(byte[] buffer, int offset, int size, MessageLoop messageLoop = null)
{
var tcs = new TaskCompletionSource <FileIOResult>();
EventHandler <FileIOResult> handler = (s, e) => { tcs.TrySetResult(e); };
try
{
HandleWriteData += handler;
if (MessageLoop == null && messageLoop == null)
{
Write(buffer, offset, size);
}
else
{
Action <PPError> action = new Action <PPError>((e) =>
{
var result = (PPError)PPBFileIO.Write(this, offset,
buffer,
size,
new BlockUntilComplete()
);
tcs.TrySetResult(new FileIOResult((int)result, (int)result == 0));
}
);
InvokeHelper(action, messageLoop);
}
return(await tcs.Task);
}
catch (Exception exc)
{
Console.WriteLine(exc.Message);
tcs.SetException(exc);
return(new FileIOResult((int)PPError.Aborted, true));
}
finally
{
HandleWriteData -= handler;
}
}
/// <summary> /// Write() writes to an offset in the file. This function might perform a /// partial write. The FileIO object must have been opened with write access. /// </summary> /// <param name="buffer">The buffer to hold the specified number of bytes read.</param> /// <param name="offset">The offset into the file.</param> /// <param name="bytesToWrite">The number of bytes to write to /// <code>offset</code>.</param> /// <returns>Error code</returns> public PPError Write(byte[] buffer, int offset, int bytesToWrite) => (PPError)PPBFileIO.Write(this, offset, buffer, bytesToWrite, new CompletionCallback(OnWriteData));