请帮助我理解为什么当通过网络发送一些帧转换字节数组时，第一帧（字节数组）正确到达， 而到达的第二个字节数组（第二个帧）的大小错误甚至是负数。
这是发送帧的客户端代码：
public static void invia(byte[] bytetosend)
{
byte[] compressed;
compressed = Compressor.Compressor.Compress(bytetosend);
byte[] bytes = new byte[1024];
try
{
IPAddress ipAddressremoto = IPAddress.Parse("192.168.1.191");
IPEndPoint remoteEP = new IPEndPoint(ipAddressremoto, 8585);
try
{
if (Form1.z == 0)
{
Form1.client = new TcpClient();
Form1.client.Connect(remoteEP);
Form1.streamclient = client.GetStream();
Form1.z = 1;
}
Form1.streamclient.Flush();
byte[] sizePacket = new byte[50];
sizePacket = BitConverter.GetBytes(compressed.Length);
System.Console.WriteLine("size of packet = " + sizePacket.Length + " compressed.Length = " + compressed.Length + " " + "size inside packet " + BitConverter.ToInt32(sizePacket, 0));
byte[] requestWithHeader = new byte[sizePacket.Length + compressed.Length];
sizePacket.CopyTo(requestWithHeader, 0);
bytetosend.CopyTo(requestWithHeader, sizePacket.Length);
streamclient.Write(requestWithHeader, 0, requestWithHeader.Length);
}
catch (ArgumentNullException ane)
{
Console.WriteLine("ArgumentNullException : {0}", ane.ToString());
}
catch (SocketException se)
{
Console.WriteLine("SocketException : {0}", se.ToString());
}
catch (Exception e)
{
Console.WriteLine("Unexpected exception : {0}", e.ToString());
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
这是接收帧的服务器端代码，不幸的是我得到了正确的， 正确尺寸框架只有第一个但不是第二个框架 注意：描述了一些旧指令而不是删除
public WindowsFormsServer()
{
var frameTask = Task.Factory.StartNew(() =>
{
try
{
while (true)
{
if (WindowsFormsServer.y == 0)
{
WindowsFormsServer.server = WindowsFormsServer.Idea_server();
// WindowsFormsServer.server.ReceiveTimeout = 50000;
// Console.WriteLine("Waiting for a connection...");
WindowsFormsServer.streamserver = server.GetStream();
}
//streamserver.Flush();
byte[] responseBytes = null;
//if (streamserver.CanRead)
//{
var responseStream = new System.IO.MemoryStream();
byte[] sizePacket = new byte[50];
streamserver.Read(sizePacket, 0, sizePacket.Length);
int responseLength = BitConverter.ToInt32(sizePacket, 0);
System.Console.WriteLine("size of packet = " + sizePacket.Length + "size inside packet = " + responseLength);
byte[] response = new byte[responseLength];
int bytesReceived = 0;
while (bytesReceived < responseLength)
{
int bytesRead = streamserver.Read(response, bytesReceived, responseLength - bytesReceived);
bytesReceived += bytesRead;
}
System.Console.WriteLine("frameTask attivo \r\n");
responseStream.Write(response, 0, responseLength);
//System.Threading.Thread.Sleep(1); //added this line
responseBytes = responseStream.ToArray();
Console.WriteLine("responseBytes Length = " + responseBytes.Length);
//}
}
}
catch (NullReferenceException ex)
{
System.Console.WriteLine("Errore: " + ex.ToString());
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
try
{
//MessageData.Picture2 = (Bitmap)byteArrayToImage(Compressor.Compressor.Decompress(responseBytes));
MessageData.Picture2 = (Bitmap)byteArrayToImage(responseBytes);
CamImageBox.Image = MessageData.Picture2;
}
catch (NullReferenceException ex)
{
System.Console.WriteLine("Errore: " + ex.ToString());
}
catch (Exception ex)
{
System.Console.WriteLine("Errore: " + ex.ToString());
}
});
//frameTask.Start();
InitializeComponent();
}
这是服务器端的错误，它将帧作为字节数组接收
'WindowsFormsServer.vshost.exe' (CLR v4.0.30319: WindowsFormsServer.vshost.exe): caricamento di 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll' completato. Caricamento dei simboli ignorato. Il modulo è ottimizzato e l'opzione del debugger 'Solo codice utente' è abilitata.
lunghezza = 5
这是使用HEADER编写客户端SENDE BYTI ARRAY FRAME的大小的课程的长度，然后我阅读服务器端接收器
inviocomandoTask attivo
这是收到的第一帧的长度，它是正确的，因为它与发件人发送的相同。
'WindowsFormsServer.vshost.exe' (CLR v4.0.30319: WindowsFormsServer.vshost.exe): caricamento di 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\mscorlib.resources\v4.0_4.0.0.0_it_b77a5c561934e089\mscorlib.resources.dll' completato. Modulo compilato senza simboli.
frameTask attivo
这是收到的第二帧的长度，这是错误的
Eccezione generata: 'System.OverflowException' in WindowsFormsServer.exe Eccezione generata: 'System.ArgumentNullException' in mscorlib.dll System.OverflowException: Le dimensioni della matrice hanno superato l'intervallo supportato. The size of the array exceeded the supported range. in WindowsFormsServer.WindowsFormsServer.<.ctor>b__12_0() in C:\Users\vmtest\Documents\CamDisplay4\WindowsFormsServer\Form1.cs:riga 70 Errore: System.ArgumentNullException: Il buffer non può essere null. Nome parametro: buffer in System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable) in WindowsFormsServer.WindowsFormsServer.byteArrayToImage(Byte[] bytesArr) in C:\Users\vmtest\Documents\CamDisplay4\WindowsFormsServer\Form1.cs:riga 170 in WindowsFormsServer.WindowsFormsServer.<.ctor>b__12_0() in C:\Users\vmtest\Documents\CamDisplay4\WindowsFormsServer\Form1.cs:riga 98 Il thread 0x19ec è terminato con il codice 0 (0x0). Il thread 0x19d4 è terminato con il codice 0 (0x0). Il programma '[1352] WindowsFormsServer.vshost.exe' è terminato con il codice 0 (0x0).
您对收到的第二帧字节数组中发生了什么有建议吗？* 您是否认为它是由服务器引起的，它在没有ASYNC方法的情况下以同步模式接收字节？
答案 0 :(得分：0)
byte[] sizePacket = new byte[50];
streamserver.Read(sizePacket, 0, sizePacket.Length);
这里，您只读取50个字节，但仅使用前4个字节。其余的都被扔掉了。
我会这样做：
var br = new BinaryReader(someStream);
var length = br.ReadUInt32();
var contents = br.ReadBytes(length);
这就是你真正需要的一切。
byte[] sizePacket = new byte[50];
sizePacket = BitConverter.GetBytes(compressed.Length);
为什么总是50个字节？这毫无意义。首先使用正确的长度。在这里，你要覆盖那个变量，所以这应该是：
byte[] sizePacket = BitConverter.GetBytes(compressed.Length);
System.Console.WriteLine("size of packet = " + sizePacket.Length + "size inside packet = " + responseLength);
这条消息是假的。这不是“数据包”的大小。 TCP不会公开数据包。数组大小为50，读取Read的返回值可能与50不同。
答案 1 :(得分：0)
现在我改变了你所说的代码： 但是我觉得它不正确并且可以改进，实际上接收器部分我需要设置帧大小，当我在接收帧之前创建字节数组时，所以我做到了：
var br = new BinaryReader(streamserver);
var length = br.ReadUInt32();
var responseLength = br.ReadBytes(4);
int responseIntLength = BitConverter.ToInt32(responseLength, 0);
byte[] response = new byte[responseIntLength];
这是新的全服务器接收器tcp端
public WindowsFormsServer()
{
var frameTask = Task.Factory.StartNew(() =>
{
try
{
while (true)
{
if (WindowsFormsServer.y == 0)
{
WindowsFormsServer.server = WindowsFormsServer.Idea_server();
// WindowsFormsServer.server.ReceiveTimeout = 50000;
// Console.WriteLine("Waiting for a connection...");
WindowsFormsServer.streamserver = server.GetStream();
}
//streamserver.Flush();
byte[] responseBytes = null;
//if (streamserver.CanRead)
//{
var responseStream = new System.IO.MemoryStream();
byte[] sizePacket = new byte[4];
var br = new BinaryReader(streamserver);
var length = br.ReadUInt32();
var responseLength = br.ReadBytes(4);
int responseIntLength = BitConverter.ToInt32(responseLength, 0);
byte[] response = new byte[responseIntLength];
System.Console.WriteLine("size inside responseIntLength = " + responseLength);
int bytesReceived = 0;
while (bytesReceived < responseIntLength)
{
int bytesRead = streamserver.Read(response, bytesReceived, responseIntLength - bytesReceived);
bytesReceived += bytesRead;
}
System.Console.WriteLine("frameTask attivo \r\n");
responseStream.Write(response, 0, responseIntLength);
//System.Threading.Thread.Sleep(1); //added this line
responseBytes = responseStream.ToArray();
Console.WriteLine("responseBytes Length = " + responseBytes.Length);
//}
}
}
catch (NullReferenceException ex)
{
System.Console.WriteLine("Errore: " + ex.ToString());
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
try
{
//MessageData.Picture2 = (Bitmap)byteArrayToImage(Compressor.Compressor.Decompress(responseBytes));
MessageData.Picture2 = (Bitmap)byteArrayToImage(responseBytes);
CamImageBox.Image = MessageData.Picture2;
}
catch (NullReferenceException ex)
{
System.Console.WriteLine("Errore: " + ex.ToString());
}
catch (Exception ex)
{
System.Console.WriteLine("Errore: " + ex.ToString());
}
});
//frameTask.Start();
InitializeComponent();
}