Question

我正在尝试在PowerShell中实现UDP广播/响应网络发现协议。我在C＃中找到了一些这样做的例子，但我在转换到PowerShell时遇到了麻烦。

协议非常简单：

从端口x向端口x发送广播。
节点使用有效负载回复端口x。
将发件人IP地址解析为构建列表。

到目前为止，我有部分广播工作。我可以发送到相应的端口，但我没有任何运气来定义源端口。我知道它有效，因为我在Wireshark中看到了响应。我现在正在改变原始端口。我正在尝试获取接收开始的代码块，而我却试图翻译C＃代码。我猜测Power Shell可以做到这一点（因为它与C＃非常相似），但我还没有看到它在任何地方都说过。

C＃示例（example，example，example，example，example），VB.NET example，Java {{3 }}

我开始尝试从C＃转换此Example（带有一些code）并且我收到运行时错误（此处为代码）：

$Enc      = [System.Text.Encoding]::ASCII 
$Message = "WPPS" *10 
$responseData   = $Enc.GetBytes( $Message ) 

#$responseData = [System.Text.Encoding]::ASCIIGetBytes("someData");

while (1)
{
    $server = New-Object System.Net.Sockets.UdpClient(1047);
    $clientEp = New-Object System.Net.IPEndPoint(0.0.0.0, 1047);
    $clientRequestData = server.Receive(ref $clientEp);
    $clientRequest = Encoding.ASCII.GetString($clientRequestData);

    Console.WriteLine($"Recived {$clientRequest} from {$clientEp.Address}, sending response: {$responseData}");
    $server.Send($responseData, $responseData.Length, $clientEp);
    $server.Close();
}

当我尝试运行上面的代码时，我会在下面重复出现错误。我确定这是C＃和PowerShell语法之间的差异，但我几乎不知道它可能是什么。我不确定第一个错误是在第一个迭代循环之后，还是在第一个迭代之后。它看起来像是。

New-Object : Exception calling ".ctor" with "1" argument(s): "Only one usage of each socket address (protocol/network 
address/port) is normally permitted"
At line:9 char:15
+     $server = New-Object System.Net.Sockets.UdpClient(1047);
+               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [New-Object], MethodInvocationException
    + FullyQualifiedErrorId : ConstructorInvokedThrowException,Microsoft.PowerShell.Commands.NewObjectCommand

New-Object : Exception calling ".ctor" with "2" argument(s): "Value cannot be null.
Parameter name: address"
At line:10 char:17
+     $clientEp = New-Object System.Net.IPEndPoint(0.0.0.0, 1047);
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [New-Object], MethodInvocationException
    + FullyQualifiedErrorId : ConstructorInvokedThrowException,Microsoft.PowerShell.Commands.NewObjectCommand

ref : The term 'ref' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of 
the name, or if a path was included, verify that the path is correct and try again.
At line:11 char:41
+     $clientRequestData = server.Receive(ref $clientEp);
+                                         ~~~
    + CategoryInfo          : ObjectNotFound: (ref:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Encoding.ASCII.GetString : The term 'Encoding.ASCII.GetString' is not recognized as the name of a cmdlet, function, script file, 
or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:12 char:22
+     $clientRequest = Encoding.ASCII.GetString($clientRequestData);
+                      ~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Encoding.ASCII.GetString:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

$Recived {$clientRequest} from {$clientEp.Address}, sending response: {$responseData} : The term '$Recived {$clientRequest} from 
{$clientEp.Address}, sending response: {$responseData}' is not recognized as the name of a cmdlet, function, script file, or 
operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:14 char:23
+ ... e.WriteLine($"Recived {$clientRequest} from {$clientEp.Address}, send ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: ($Recived {$clie...{$responseData}:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

Exception calling "Send" with "3" argument(s): "A request to send or receive data was disallowed because the socket is not 
connected and (when sending on a datagram socket using a sendto call) no address was supplied"
At line:15 char:5
+     $server.Send($responseData, $responseData.Length, $clientEp);
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SocketException

在Power Shell中是否有任何关于如何执行此操作的示例？ Power Shell能否实际做到这一点？

我在Power Shell中了解了几件事，但几乎没有关于C＃的事情。

在PowerShell中实现UDP网络发现

0 个答案: