Question

我有一个使用 StreamSocket 的小型UWP应用。通过使用 socket.InputStream.AsStreamForRead（）方法访问套接字。

这几乎适用于所有大小的传入数据（10字节至6,000字节）。但是，当使用带有缓冲区大小的重载时，套接字会在收到更多数据时挂起。因此，如果将缓冲区设置为4096，将不再接收6000字节。即使以10字节的块大小读取数据，它也不起作用。方法 ReadAsync 永远挂起。

我不确定这是否是错误。我希望我仍然可以接收数据。如果不是这样，我需要知道该缓冲区的默认大小或行为。

示例代码：

StreamSocket socket = InitSomewhere();
var readStream = socket.InputStream.AsStreamForRead(500);
var buffer = new byte[100]
readStream.ReadAsync(buffer, 0, 100) // Hangs here if received > 500!

有人有主意吗？

最诚挚的问候，克里斯坦

Answer 1

首先，我无法使用StreamSocket官方样本重现此问题。

另一方面，您可以尝试使用DataReader类作为上述示例读取数据。

private async void OnConnection(
    StreamSocketListener sender, 
    StreamSocketListenerConnectionReceivedEventArgs args)
{
    DataReader reader = new DataReader(args.Socket.InputStream);
    try
    {
        while (true)
        {
            // Read first 4 bytes (length of the subsequent string).
            uint sizeFieldCount = await reader.LoadAsync(sizeof(uint));
            if (sizeFieldCount != sizeof(uint))
            {
                // The underlying socket was closed before we were able to read the whole data.
                return;
            }

            // Read the string.
            uint stringLength = reader.ReadUInt32();
            uint actualStringLength = await reader.LoadAsync(stringLength);
            if (stringLength != actualStringLength)
            {
                // The underlying socket was closed before we were able to read the whole data.
                return;
            }

            // Display the string on the screen. The event is invoked on a non-UI thread, so we need to marshal
            // the text back to the UI thread.
            NotifyUserFromAsyncThread(
                String.Format("Received data: \"{0}\"", reader.ReadString(actualStringLength)), 
                NotifyType.StatusMessage);
        }
    }

在UWP中从Stream中读取时出现问题

1 个答案: