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我正在尝试开发自己的 Apple Push Notification Server 应用程序来向 iOS 设备发送推送通知。我从 GitHub 下载了Moon-APNS的源代码，并对其进行了修改以适合我的 Web API 应用程序。

以下代码行导致 IIS 引发未处理的 win32 异常：

apnsStream.BeginRead(response, 0, 6, new AsyncCallback(ReadResponse), new MyAsyncInfo(response, apnsStream));

我在我的计算机应用程序窗口中查看事件查看器，未处理的异常来自该ReadResponse方法。我有包含在语句中的 ReadResponse 方法和apnsStream.BeginRead调用的代码try-catch，它仍然会引发未处理的异常。

消息：安全手柄已关闭

堆栈跟踪：在 System.Net.LazyAsyncResult.Complete(IntPtr userToken) 在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext) 在 System.Net.FixedSizeReader.ReadCallback(IAsyncResult transportResult) 在 System.Net.LazyAsyncResult.Complete(IntPtr userToken) , ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Net.ContextAwareResult.Complete(IntPtr userToken) 在 System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes,NativeOverlapped* nativeOverlapped) 在 System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

这是我打开 TcpClient 到 Apple Push Notification Server 时的完整源代码部分：

using(TcpClient apnsClient = new TcpClient())
{
    //open connection to the Apple Push Notification service a TCP client connection
    apnsClient.Connect("gateway.sandbox.push.apple.com", 2195);

    //open an SSL Stream
    using(SslStream apnsStream = new SslStream(apnsClient.GetStream(), false, ValidateServerCertificate, SelectLocalCertificate))
    {
        apnsStream.AuthenticateAsClient("gateway.sandbox.push.apple.com", certificates, System.Security.Authentication.SslProtocols.Default, false);

        _CanReadStream = apnsStream.CanRead;
        _IsConnected = true;

        var response = new byte[6];

        apnsStream.BeginRead(response, 0, 6, new AsyncCallback(ReadResponse), new MyAsyncInfo(response, apnsStream));

        //put code to generate payload here           
    }
}

ReadResponse方法的源代码

private void ReadResponse(IAsyncResult ar)
{
    if (_IsConnected) return;

    int payLoadIndex = 0;
    string payLoadId = string.Empty;

    try
    {
        var info = ar.AsyncState as MyAsyncInfo;
        info.Stream.ReadTimeout = 100;

        if (_CanReadStream)
        {
            var command = Convert.ToInt16(info.ByteArray[0]);
            var status = Convert.ToInt16(info.ByteArray[1]);
            var id = new byte[4];
            Array.Copy(info.ByteArray, 2, id, 0, 4);

            payLoadId = Encoding.Default.GetString(id);
            payLoadIndex = int.Parse(payLoadId) - 1000;

            _RejectedDevices.Add(_NotificationPayload[payLoadIndex].DeviceToken);

             _IsConnected = false;
         }
    }
    catch(Exception ex)
    {
        throw ex;
    }
}

可以做些什么来解决这个问题？

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0 回答 0