Web 服务器 Windows 10 物联网 (vb.net)
Web Server with Windows 10 IoT (vb.net)
我正在尝试从 c# 中的各种来源导入和转换以创建 Web 服务器。配置是这样的：
配置
Development platform: VS Community in 2015
Type of application: VB / Windows IoT Core / Background Application
Hardware: Raspberry Pi 3
OS: Windows 10 IoT (v. 10.0.14393.693)
问题
在某些情况下无法发送页面输出。但是在任何情况下（即使它显示输出），页面都会继续加载直到应用程序崩溃或陷入无限循环。
代码
任务
Public NotInheritable Class StartupTask
Implements IBackgroundTask
Private _Deferral As BackgroundTaskDeferral
Public Async Sub Run(taskInstance As IBackgroundTaskInstance) Implements IBackgroundTask.Run
taskInstance.GetDeferral()
Dim server As New webServer()
Await Windows.System.Threading.ThreadPool.RunAsync(AddressOf server.Start)
End Sub
End Class
webserverclass
Imports System.Text
Imports Windows.Networking.Sockets
Imports Windows.Storage.Streams
Friend Class webServer
Private Const BufferSize As UInteger = 8192
Public Async Sub Start()
Try
Dim listener As New StreamSocketListener()
Debug.WriteLine("Debug: 1.1")
Await listener.BindServiceNameAsync("8081").AsTask()
Debug.WriteLine("Debug: 1.2")
AddHandler listener.ConnectionReceived, Async Sub(sender, args)
Debug.WriteLine("Debug: 2")
Dim request As New StringBuilder()
Using input As IInputStream = args.Socket.InputStream
Dim data As Byte() = New Byte(BufferSize - 1) {}
Dim buffer As IBuffer = data.AsBuffer()
Dim dataRead As UInteger = BufferSize
While dataRead = BufferSize
Await input.ReadAsync(buffer, BufferSize, InputStreamOptions.[Partial])
request.Append(Encoding.UTF8.GetString(data, 0, data.Length))
dataRead = buffer.Length
Debug.WriteLine("Debug: 2.2 - " & request.ToString)
End While
End Using
Debug.WriteLine("Debug: 3")
Using output As IOutputStream = args.Socket.OutputStream
Debug.WriteLine("Debug: 3.1")
Using response As Stream = output.AsStreamForWrite()
Debug.WriteLine("Debug: 3.2")
Dim page As String = ""
Dim folder = Package.Current.InstalledLocation
Dim file = Await folder.GetFileAsync("index.html")
Dim readFile = Await Windows.Storage.FileIO.ReadLinesAsync(file)
For Each line In readFile
page += line
Next
Debug.WriteLine("Debug: 3.3 - " & page)
Dim bodyArray As Byte() = Encoding.UTF8.GetBytes(page)
Dim bodyStream = New MemoryStream(bodyArray)
Debug.WriteLine("Debug: 3.4")
Dim header = "HTTP/1.1 200 OK" & vbCr & vbLf + "Content-Length: {bodyStream.Length}" & vbCr & vbLf + "Connection: close" & vbCr & vbLf & vbCr & vbLf
Dim headerArray As Byte() = Encoding.UTF8.GetBytes(header)
Debug.WriteLine("Debug: 3.5")
Await response.WriteAsync(headerArray, 0, headerArray.Length)
Debug.WriteLine("Debug: 3.6")
Await bodyStream.CopyToAsync(response)
Debug.WriteLine("Debug: 3.7")
Await response.FlushAsync()
Debug.WriteLine("Debug: 3.8")
End Using
End Using
Debug.WriteLine("Debug: 4")
End Sub
Debug.WriteLine("Debug: 1.3")
Catch generatedExceptionName As Exception
Debug.WriteLine("Error: " & generatedExceptionName.Message)
End Try
End Sub
End Class
清单
<Capabilities>
<Capability Name="internetClient" />
<Capability Name="internetClientServer" />
<Capability Name="privateNetworkClientServer" />
</Capabilities>
调试输出
Debug: 1.1
Debug: 1.2
Debug: 1.3
Debug: 2
Debug: 2.2 - GET /index.html HTTP/1.1 Host: 192.168.1.146:8081
Connection: keep-alive (and all the header...)
Debug: 3
Debug: 3.1
Debug: 3.2
Debug: 3.3 - Baro Raspy WIoT Hello world
:D
Debug: 3.4
Debug: 3.5
Debug: 3.6
Debug: 3.7
Debug: 3.8
Debug: 4
Il thread 0x64c è terminato con il codice 0 (0x0).
Il thread 0xcfc è terminato con il codice 0 (0x0).
我想我在异步线程上做错了什么，但我就是无法理解。
提前致谢
我自己发现了问题。
http header 格式错误。在从 c# 到 vb 的转换过程中，我没有在 vb 变量中更改此 {bodyStream.Length}。
由此
Dim header = "HTTP/1.1 200 OK" & vbCr & vbLf + "Content-Length: {bodyStream.Length}" & vbCr & vbLf + "Connection: close" & vbCr & vbLf & vbCr & vbLf
到此
Dim header = "HTTP/1.1 200 OK" & vbCr & vbLf + "Content-Length: " & bodyStream.Length & vbCr & vbLf + "Connection: close" & vbCr & vbLf & vbCr & vbLf
现在我只希望这段代码对某些人有用，至少我不会浪费那么多时间:)
问题是_Deferral。
捕获 _Deferral。
看这个
Private _Deferral As BackgroundTaskDeferral = Nothing
Public Async Sub Run(taskInstance As IBackgroundTaskInstance) Implements IBackgroundTask.Run
_Deferral = taskInstance.GetDeferral()
Dim server As New MyWebserver()
Await Windows.System.Threading.ThreadPool.RunAsync(AddressOf server.Start)
End Sub
干得好
我正在尝试从 c# 中的各种来源导入和转换以创建 Web 服务器。配置是这样的：
配置
Development platform: VS Community in 2015
Type of application: VB / Windows IoT Core / Background Application
Hardware: Raspberry Pi 3
OS: Windows 10 IoT (v. 10.0.14393.693)
问题
在某些情况下无法发送页面输出。但是在任何情况下（即使它显示输出），页面都会继续加载直到应用程序崩溃或陷入无限循环。
代码
任务
Public NotInheritable Class StartupTask
Implements IBackgroundTask
Private _Deferral As BackgroundTaskDeferral
Public Async Sub Run(taskInstance As IBackgroundTaskInstance) Implements IBackgroundTask.Run
taskInstance.GetDeferral()
Dim server As New webServer()
Await Windows.System.Threading.ThreadPool.RunAsync(AddressOf server.Start)
End Sub
End Class
webserverclass
Imports System.Text
Imports Windows.Networking.Sockets
Imports Windows.Storage.Streams
Friend Class webServer
Private Const BufferSize As UInteger = 8192
Public Async Sub Start()
Try
Dim listener As New StreamSocketListener()
Debug.WriteLine("Debug: 1.1")
Await listener.BindServiceNameAsync("8081").AsTask()
Debug.WriteLine("Debug: 1.2")
AddHandler listener.ConnectionReceived, Async Sub(sender, args)
Debug.WriteLine("Debug: 2")
Dim request As New StringBuilder()
Using input As IInputStream = args.Socket.InputStream
Dim data As Byte() = New Byte(BufferSize - 1) {}
Dim buffer As IBuffer = data.AsBuffer()
Dim dataRead As UInteger = BufferSize
While dataRead = BufferSize
Await input.ReadAsync(buffer, BufferSize, InputStreamOptions.[Partial])
request.Append(Encoding.UTF8.GetString(data, 0, data.Length))
dataRead = buffer.Length
Debug.WriteLine("Debug: 2.2 - " & request.ToString)
End While
End Using
Debug.WriteLine("Debug: 3")
Using output As IOutputStream = args.Socket.OutputStream
Debug.WriteLine("Debug: 3.1")
Using response As Stream = output.AsStreamForWrite()
Debug.WriteLine("Debug: 3.2")
Dim page As String = ""
Dim folder = Package.Current.InstalledLocation
Dim file = Await folder.GetFileAsync("index.html")
Dim readFile = Await Windows.Storage.FileIO.ReadLinesAsync(file)
For Each line In readFile
page += line
Next
Debug.WriteLine("Debug: 3.3 - " & page)
Dim bodyArray As Byte() = Encoding.UTF8.GetBytes(page)
Dim bodyStream = New MemoryStream(bodyArray)
Debug.WriteLine("Debug: 3.4")
Dim header = "HTTP/1.1 200 OK" & vbCr & vbLf + "Content-Length: {bodyStream.Length}" & vbCr & vbLf + "Connection: close" & vbCr & vbLf & vbCr & vbLf
Dim headerArray As Byte() = Encoding.UTF8.GetBytes(header)
Debug.WriteLine("Debug: 3.5")
Await response.WriteAsync(headerArray, 0, headerArray.Length)
Debug.WriteLine("Debug: 3.6")
Await bodyStream.CopyToAsync(response)
Debug.WriteLine("Debug: 3.7")
Await response.FlushAsync()
Debug.WriteLine("Debug: 3.8")
End Using
End Using
Debug.WriteLine("Debug: 4")
End Sub
Debug.WriteLine("Debug: 1.3")
Catch generatedExceptionName As Exception
Debug.WriteLine("Error: " & generatedExceptionName.Message)
End Try
End Sub
End Class
清单
<Capabilities>
<Capability Name="internetClient" />
<Capability Name="internetClientServer" />
<Capability Name="privateNetworkClientServer" />
</Capabilities>
调试输出
Debug: 1.1
Debug: 1.2
Debug: 1.3
Debug: 2
Debug: 2.2 - GET /index.html HTTP/1.1 Host: 192.168.1.146:8081 Connection: keep-alive (and all the header...)
Debug: 3
Debug: 3.1
Debug: 3.2
Debug: 3.3 - Baro Raspy WIoT Hello world :D
Debug: 3.4
Debug: 3.5
Debug: 3.6
Debug: 3.7
Debug: 3.8
Debug: 4
Il thread 0x64c è terminato con il codice 0 (0x0).
Il thread 0xcfc è terminato con il codice 0 (0x0).
我想我在异步线程上做错了什么，但我就是无法理解。
提前致谢
我自己发现了问题。
http header 格式错误。在从 c# 到 vb 的转换过程中，我没有在 vb 变量中更改此 {bodyStream.Length}。
由此
Dim header = "HTTP/1.1 200 OK" & vbCr & vbLf + "Content-Length: {bodyStream.Length}" & vbCr & vbLf + "Connection: close" & vbCr & vbLf & vbCr & vbLf
到此
Dim header = "HTTP/1.1 200 OK" & vbCr & vbLf + "Content-Length: " & bodyStream.Length & vbCr & vbLf + "Connection: close" & vbCr & vbLf & vbCr & vbLf
现在我只希望这段代码对某些人有用，至少我不会浪费那么多时间:)
问题是_Deferral。 捕获 _Deferral。 看这个
Private _Deferral As BackgroundTaskDeferral = Nothing
Public Async Sub Run(taskInstance As IBackgroundTaskInstance) Implements IBackgroundTask.Run
_Deferral = taskInstance.GetDeferral()
Dim server As New MyWebserver()
Await Windows.System.Threading.ThreadPool.RunAsync(AddressOf server.Start)
End Sub
干得好