Demonstra Passo a passo: A criação de um Host de modelo de texto personalizado
A o modelo de texto host fornece um ambiente que permita a mecanismo de transformação do modelo de texto para executar. O host é responsável por gerenciar a interação do mecanismo com o sistema de arquivos. O mecanismo ou processador de diretriz que precisa de um arquivo ou um assembly pode solicitar um recurso do host. O host pode pesquisar diretórios e o cache global de assemblies para localizar o recurso solicitado. Para obter mais informações, consulte O processo de transformação do modelo de texto.
Você pode escrever um host personalizado se você deseja usar o transformação do modelo de texto a funcionalidade fora de Visual Studio ou se você deseja integrar essa funcionalidade de ferramentas personalizadas. Para criar um host personalizado, você deve criar uma classe que herda de ITextTemplatingEngineHost. Para a documentação dos métodos individuais, consulte ITextTemplatingEngineHost.
Aviso
Se você estiver escrevendo um Visual Studio extensão ou pacote, considere o uso do serviço de modelagem de texto em vez de criar seu próprio host. Para obter mais informações, consulte Invocar a transformação de texto em uma extensão do VS.
Tarefas ilustradas nesta explicação passo a passo incluem o seguinte:
A criação de um host de modelo de texto personalizado.
Testando o host personalizado.
Pré-requisitos
Para concluir este passo a passo, você deve ter o seguinte:
Visual Studio 2010
SDK do Visual Studio 2010
A criação de um Host de modelo de texto personalizado
Esta explicação passo a passo, você pode criar um host personalizado em um aplicativo executável que pode ser chamado a partir da linha de comando. O aplicativo aceita um arquivo de modelo de texto como um argumento, lê o modelo, chama o mecanismo para transformar o modelo e exibe quaisquer erros que ocorrem na janela do prompt de comando.
Para criar um host personalizado
Visual Studio, crie um novo de Visual Basic ou um aplicativo de console da C# chamado CustomHost.
Adicione uma referência para os seguintes módulos:
Microsoft.VisualStudio.TextTemplating.10.0
Microsoft.VisualStudio.TextTemplating.interfaces.10.0
Substitua o código no arquivo Program. cs ou Module1. vb com o seguinte código:
using System; using System.IO; using System.CodeDom.Compiler; using System.Collections.Generic; using System.Text; using Microsoft.VisualStudio.TextTemplating; namespace CustomHost { //The text template transformation engine is responsible for running //the transformation process. //The host is responsible for all input and output, locating files, //and anything else related to the external environment. //------------------------------------------------------------------------- class CustomCmdLineHost : ITextTemplatingEngineHost { //the path and file name of the text template that is being processed //--------------------------------------------------------------------- internal string TemplateFileValue; public string TemplateFile { get { return TemplateFileValue; } } //This will be the extension of the generated text output file. //The host can provide a default by setting the value of the field here. //The engine can change this value based on the optional output directive //if the user specifies it in the text template. //--------------------------------------------------------------------- private string fileExtensionValue = ".txt"; public string FileExtension { get { return fileExtensionValue; } } //This will be the encoding of the generated text output file. //The host can provide a default by setting the value of the field here. //The engine can change this value based on the optional output directive //if the user specifies it in the text template. //--------------------------------------------------------------------- private Encoding fileEncodingValue = Encoding.UTF8; public Encoding FileEncoding { get { return fileEncodingValue; } } //These are the errors that occur when the engine processes a template. //The engine passes the errors to the host when it is done processing, //and the host can decide how to display them. For example, the host //can display the errors in the UI or write them to a file. //--------------------------------------------------------------------- private CompilerErrorCollection errorsValue; public CompilerErrorCollection Errors { get { return errorsValue; } } //The host can provide standard assembly references. //The engine will use these references when compiling and //executing the generated transformation class. //-------------------------------------------------------------- public IList<string> StandardAssemblyReferences { get { return new string[] { //If this host searches standard paths and the GAC, //we can specify the assembly name like this. //--------------------------------------------------------- //"System" //Because this host only resolves assemblies from the //fully qualified path and name of the assembly, //this is a quick way to get the code to give us the //fully qualified path and name of the System assembly. //--------------------------------------------------------- typeof(System.Uri).Assembly.Location }; } } //The host can provide standard imports or using statements. //The engine will add these statements to the generated //transformation class. //-------------------------------------------------------------- public IList<string> StandardImports { get { return new string[] { "System" }; } } //The engine calls this method based on the optional include directive //if the user has specified it in the text template. //This method can be called 0, 1, or more times. //--------------------------------------------------------------------- //The included text is returned in the context parameter. //If the host searches the registry for the location of include files, //or if the host searches multiple locations by default, the host can //return the final path of the include file in the location parameter. //--------------------------------------------------------------------- public bool LoadIncludeText(string requestFileName, out string content, out string location) { content = System.String.Empty; location = System.String.Empty; //If the argument is the fully qualified path of an existing file, //then we are done. //---------------------------------------------------------------- if (File.Exists(requestFileName)) { content = File.ReadAllText(requestFileName); return true; } //This can be customized to search specific paths for the file. //This can be customized to accept paths to search as command line //arguments. //---------------------------------------------------------------- else { return false; } } //Called by the Engine to enquire about //the processing options you require. //If you recognize that option, return an //appropriate value. //Otherwise, pass back NULL. //-------------------------------------------------------------------- public object GetHostOption(string optionName) { object returnObject; switch (optionName) { case "CacheAssemblies": returnObject = true; break; default: returnObject = null; break; } return returnObject; } //The engine calls this method to resolve assembly references used in //the generated transformation class project and for the optional //assembly directive if the user has specified it in the text template. //This method can be called 0, 1, or more times. //--------------------------------------------------------------------- public string ResolveAssemblyReference(string assemblyReference) { //If the argument is the fully qualified path of an existing file, //then we are done. (This does not do any work.) //---------------------------------------------------------------- if (File.Exists(assemblyReference)) { return assemblyReference; } //Maybe the assembly is in the same folder as the text template that //called the directive. //---------------------------------------------------------------- string candidate = Path.Combine(Path.GetDirectoryName(this.TemplateFile), assemblyReference); if (File.Exists(candidate)) { return candidate; } //This can be customized to search specific paths for the file //or to search the GAC. //---------------------------------------------------------------- //This can be customized to accept paths to search as command line //arguments. //---------------------------------------------------------------- //If we cannot do better, return the original file name. return ""; } //The engine calls this method based on the directives the user has //specified in the text template. //This method can be called 0, 1, or more times. //--------------------------------------------------------------------- public Type ResolveDirectiveProcessor(string processorName) { //This host will not resolve any specific processors. //Check the processor name, and if it is the name of a processor the //host wants to support, return the type of the processor. //--------------------------------------------------------------------- if (string.Compare(processorName, "XYZ", StringComparison.OrdinalIgnoreCase) == 0) { //return typeof(); } //This can be customized to search specific paths for the file //or to search the GAC //If the directive processor cannot be found, throw an error. throw new Exception("Directive Processor not found"); } //A directive processor can call this method if a file name does not //have a path. //The host can attempt to provide path information by searching //specific paths for the file and returning the file and path if found. //This method can be called 0, 1, or more times. //--------------------------------------------------------------------- public string ResolvePath(string fileName) { if (fileName == null) { throw new ArgumentNullException("the file name cannot be null"); } //If the argument is the fully qualified path of an existing file, //then we are done //---------------------------------------------------------------- if (File.Exists(fileName)) { return fileName; } //Maybe the file is in the same folder as the text template that //called the directive. //---------------------------------------------------------------- string candidate = Path.Combine(Path.GetDirectoryName(this.TemplateFile), fileName); if (File.Exists(candidate)) { return candidate; } //Look more places. //---------------------------------------------------------------- //More code can go here... //If we cannot do better, return the original file name. return fileName; } //If a call to a directive in a text template does not provide a value //for a required parameter, the directive processor can try to get it //from the host by calling this method. //This method can be called 0, 1, or more times. //--------------------------------------------------------------------- public string ResolveParameterValue(string directiveId, string processorName, string parameterName) { if (directiveId == null) { throw new ArgumentNullException("the directiveId cannot be null"); } if (processorName == null) { throw new ArgumentNullException("the processorName cannot be null"); } if (parameterName == null) { throw new ArgumentNullException("the parameterName cannot be null"); } //Code to provide "hard-coded" parameter values goes here. //This code depends on the directive processors this host will interact with. //If we cannot do better, return the empty string. return String.Empty; } //The engine calls this method to change the extension of the //generated text output file based on the optional output directive //if the user specifies it in the text template. //--------------------------------------------------------------------- public void SetFileExtension(string extension) { //The parameter extension has a '.' in front of it already. //-------------------------------------------------------- fileExtensionValue = extension; } //The engine calls this method to change the encoding of the //generated text output file based on the optional output directive //if the user specifies it in the text template. //---------------------------------------------------------------------- public void SetOutputEncoding(System.Text.Encoding encoding, bool fromOutputDirective) { fileEncodingValue = encoding; } //The engine calls this method when it is done processing a text //template to pass any errors that occurred to the host. //The host can decide how to display them. //--------------------------------------------------------------------- public void LogErrors(CompilerErrorCollection errors) { errorsValue = errors; } //This is the application domain that is used to compile and run //the generated transformation class to create the generated text output. //---------------------------------------------------------------------- public AppDomain ProvideTemplatingAppDomain(string content) { //This host will provide a new application domain each time the //engine processes a text template. //------------------------------------------------------------- return AppDomain.CreateDomain("Generation App Domain"); //This could be changed to return the current appdomain, but new //assemblies are loaded into this AppDomain on a regular basis. //If the AppDomain lasts too long, it will grow indefintely, //which might be regarded as a leak. //This could be customized to cache the application domain for //a certain number of text template generations (for example, 10). //This could be customized based on the contents of the text //template, which are provided as a parameter for that purpose. } } //This will accept the path of a text template as an argument. //It will create an instance of the custom host and an instance of the //text templating transformation engine, and will transform the //template to create the generated text output file. //------------------------------------------------------------------------- class Program { static void Main(string[] args) { try { ProcessTemplate(args); } catch (Exception ex) { Console.WriteLine(ex.Message); } } static void ProcessTemplate(string[] args) { string templateFileName = null; if (args.Length == 0) { throw new System.Exception("you must provide a text template file path"); } templateFileName = args[0]; if (templateFileName == null) { throw new ArgumentNullException("the file name cannot be null"); } if (!File.Exists(templateFileName)) { throw new FileNotFoundException("the file cannot be found"); } CustomCmdLineHost host = new CustomCmdLineHost(); Engine engine = new Engine(); host.TemplateFileValue = templateFileName; //Read the text template. string input = File.ReadAllText(templateFileName); //Transform the text template. string output = engine.ProcessTemplate(input, host); string outputFileName = Path.GetFileNameWithoutExtension(templateFileName); outputFileName = Path.Combine(Path.GetDirectoryName(templateFileName), outputFileName); outputFileName = outputFileName + "1" + host.FileExtension; File.WriteAllText(outputFileName, output, host.FileEncoding); foreach (CompilerError error in host.Errors) { Console.WriteLine(error.ToString()); } } } }Imports System Imports System.IO Imports System.CodeDom.Compiler Imports System.Collections.Generic Imports System.Text Imports Microsoft.VisualStudio.TextTemplating Namespace CustomHost 'The text template transformation engine is responsible for running 'the transformation process. 'The host is responsible for all input and output, locating files, 'and anything else related to the external environment. '------------------------------------------------------------------------- Public Class CustomCmdLineHost Implements ITextTemplatingEngineHost 'the path and file name of the text template that is being processed '--------------------------------------------------------------------- Friend TemplateFileValue As String Public ReadOnly Property TemplateFile() As String Implements ITextTemplatingEngineHost.TemplateFile Get Return TemplateFileValue End Get End Property 'This will be the extension of the generated text output file. 'The host can provide a default by setting the value of the field here. 'The engine can change this based on the optional output directive 'if the user specifies it in the text template. '--------------------------------------------------------------------- Private fileExtensionValue As String = ".txt" Public ReadOnly Property FileExtension() As String Get Return fileExtensionValue End Get End Property 'This will be the encoding of the generated text output file. 'The host can provide a default by setting the value of the field here. 'The engine can change this value based on the optional output directive 'if the user specifies it in the text template. '--------------------------------------------------------------------- Private fileEncodingValue As Encoding = Encoding.UTF8 Public ReadOnly Property fileEncoding() As Encoding Get Return fileEncodingValue End Get End Property 'These are the errors that occur when the engine processes a template. 'The engine passes the errors to the host when it is done processing, 'and the host can decide how to display them. For example, the host 'can display the errors in the UI or write them to a file. '--------------------------------------------------------------------- Private errorsValue As CompilerErrorCollection Public ReadOnly Property Errors() As CompilerErrorCollection Get Return errorsValue End Get End Property 'The host can provide standard assembly references. 'The engine will use these references when compiling and 'executing the generated transformation class. '-------------------------------------------------------------- Public ReadOnly Property StandardAssemblyReferences() As IList(Of String) Implements ITextTemplatingEngineHost.StandardAssemblyReferences Get 'If this host searches standard paths and the GAC, 'we can specify the assembly name like this. '--------------------------------------------------------- 'Return New String() {"System"} 'Because this host only resolves assemblies from the 'fully qualified path and name of the assembly, 'this is a quick way to get the code to give us the 'fully qualified path and name of the System assembly. '--------------------------------------------------------- Return New String() {(New System.UriBuilder()).GetType().Assembly.Location} End Get End Property 'The host can provide standard imports or imports statements. 'The engine will add these statements to the generated 'transformation class. '-------------------------------------------------------------- Public ReadOnly Property StandardImports() As IList(Of String) Implements ITextTemplatingEngineHost.StandardImports Get Return New String() {"System"} End Get End Property ' Called by the Engine to enquire about ' the processing options you require. ' If you recognize that option, return an ' appropriate value. ' Otherwise, pass back NULL. '-------------------------------------------------------------------- Public Function GetHostOption(ByVal optionName As String) As Object Implements ITextTemplatingEngineHost.GetHostOption Dim returnObject As Object Select Case optionName Case "CacheAssemblies" returnObject = True Case Else returnObject = False End Select Return returnObject End Function 'The engine calls this method based on the optional include directive 'if the user has specified it in the text template. 'This method can be called 0, 1, or more times. '--------------------------------------------------------------------- 'The included text is returned in the context parameter. 'If the host searches the registry for the location of include files 'or if the host searches multiple locations by default, the host can 'return the final path of the include file in the location parameter. '--------------------------------------------------------------------- Public Function LoadIncludeText(ByVal requestFileName As String, ByRef content As String, ByRef location As String) As Boolean Implements ITextTemplatingEngineHost.LoadIncludeText content = System.String.Empty location = System.String.Empty 'If the argument is the fully qualified path of an existing file, 'then we are done. '---------------------------------------------------------------- If File.Exists(requestFileName) Then content = File.ReadAllText(requestFileName) Return True 'This can be customized to search specific paths for the file. 'This can be customized to accept paths to search as command line 'arguments. '---------------------------------------------------------------- Else Return False End If End Function 'The engine calls this method to resolve assembly references used in 'the generated transformation class project and for the optional 'assembly directive if the user has specified it in the text template. 'This method can be called 0, 1, or more times. '--------------------------------------------------------------------- Public Function ResolveAssemblyReference(ByVal assemblyReference As String) As String Implements ITextTemplatingEngineHost.ResolveAssemblyReference 'If the argument is the fully qualified path of an existing file, 'then we are done. (This does not do any work.) '---------------------------------------------------------------- If File.Exists(assemblyReference) Then Return assemblyReference End If 'Maybe the assembly is in the same folder as the text template that 'called the directive. '---------------------------------------------------------------- Dim candidate As String = Path.Combine(Path.GetDirectoryName(Me.TemplateFile), assemblyReference) If File.Exists(candidate) Then Return candidate End If 'This can be customized to search specific paths for the file, 'or to search the GAC. '---------------------------------------------------------------- 'This can be customized to accept paths to search as command line 'arguments. '---------------------------------------------------------------- 'If we cannot do better, return the original file name. Return "" End Function 'The engine calls this method based on the directives the user has 'specified in the text template. 'This method can be called 0, 1, or more times. '--------------------------------------------------------------------- Public Function ResolveDirectiveProcessor(ByVal processorName As String) As System.Type Implements ITextTemplatingEngineHost.ResolveDirectiveProcessor 'This host will not resolve any specific processors. 'Check the processor name, and if it is the name of a processor the 'host wants to support, return the type of the processor. '--------------------------------------------------------------------- If String.Compare(processorName, "XYZ", StringComparison.InvariantCultureIgnoreCase) = 0 Then 'return typeof() End If 'This can be customized to search specific paths for the file, 'or to search the GAC. 'If the directive processor cannot be found, throw an error. Throw New Exception("Directive Processor not found") End Function 'A directive processor can call this method if a file name does not 'have a path. 'The host can attempt to provide path information by searching 'specific paths for the file and returning the file and path if found. 'This method can be called 0, 1, or more times. '--------------------------------------------------------------------- Public Function ResolvePath(ByVal fileName As String) As String Implements ITextTemplatingEngineHost.ResolvePath If fileName Is Nothing Then Throw New ArgumentNullException("the file name cannot be null") End If 'If the argument is the fully qualified path of an existing file, 'then we are done. '---------------------------------------------------------------- If File.Exists(fileName) Then Return fileName End If 'Maybe the file is in the same folder as the text template that 'called the directive. '---------------------------------------------------------------- Dim candidate As String = Path.Combine(Path.GetDirectoryName(Me.TemplateFile), fileName) If File.Exists(candidate) Then Return candidate End If 'Look more places. '---------------------------------------------------------------- 'More code can go here... 'If we cannot do better, return the original file name Return fileName End Function 'If a call to a directive in a text template does not provide a value 'for a required parameter, the directive processor can try to get it 'from the host by calling this method. 'This method can be called 0, 1, or more times. '--------------------------------------------------------------------- Public Function ResolveParameterValue(ByVal directiveId As String, ByVal processorName As String, ByVal parameterName As String) As String Implements ITextTemplatingEngineHost.ResolveParameterValue If directiveId Is Nothing Then Throw New ArgumentNullException("the directiveId cannot be null") End If If processorName Is Nothing Then Throw New ArgumentNullException("the processorName cannot be null") End If If parameterName Is Nothing Then Throw New ArgumentNullException("the parameterName cannot be null") End If 'Code to provide "hard-coded" parameter values goes here. 'This code depends on the directive processors this host will interact with. 'If we cannot do better, return the empty string. Return String.Empty End Function 'The engine calls this method to change the extension of the 'generated text output file based on the optional output directive 'if the user specifies it in the text template. '--------------------------------------------------------------------- Public Sub SetFileExtension(ByVal extension As String) Implements ITextTemplatingEngineHost.SetFileExtension 'The parameter extension has a '.' in front of it already. '-------------------------------------------------------- fileExtensionValue = extension End Sub 'The engine calls this method to change the encoding of the 'generated text output file based on the optional output directive 'if the user specifies it in the text template. '--------------------------------------------------------------------- Public Sub SetOutputEncoding(ByVal encoding As System.Text.Encoding, ByVal fromOutputDirective As Boolean) Implements ITextTemplatingEngineHost.SetOutputEncoding fileEncodingValue = encoding End Sub 'The engine calls this method when it is done processing a text 'template to pass any errors that occurred to the host. 'The host can decide how to display them. '--------------------------------------------------------------------- Public Sub LogErrors(ByVal errors As System.CodeDom.Compiler.CompilerErrorCollection) Implements ITextTemplatingEngineHost.LogErrors errorsValue = errors End Sub 'This is the application domain that is used to compile and run 'the generated transformation class to create the generated text output. '---------------------------------------------------------------------- Public Function ProvideTemplatingAppDomain(ByVal content As String) As System.AppDomain Implements ITextTemplatingEngineHost.ProvideTemplatingAppDomain 'This host will provide a new application domain each time the 'engine processes a text template. '------------------------------------------------------------- Return AppDomain.CreateDomain("Generation App Domain") 'This could be changed to return the current appdomain, but new 'assemblies are loaded into this AppDomain on a regular basis. 'If the AppDomain lasts too long, it will grow indefintely, 'which might be regarded as a leak. 'This could be customized to cache the application domain for 'a certain number of text template generations (for example, 10). 'This could be customized based on the contents of the text 'template, which are provided as a parameter for that purpose. End Function End Class 'CustomCmdLineHost 'This will accept the path of a text template as an argument. 'It will create an instance of the custom host and an instance of the 'text templating transformation engine. It will also transform the 'template to create the generated text output file. '------------------------------------------------------------------------- Class Program Shared Sub Main(ByVal args As String()) Try ProcessTemplate(args) Catch ex As Exception Console.WriteLine(ex.Message) End Try End Sub Shared Sub ProcessTemplate(ByVal args As String()) Dim templateFileName As String = "" If args.Length = 0 Then Throw New System.Exception("you must provide a text template file path") End If templateFileName = args(0) If templateFileName Is Nothing Then Throw New ArgumentNullException("the file name cannot be null") End If If Not File.Exists(templateFileName) Then Throw New FileNotFoundException("the file cannot be found") End If Dim host As CustomCmdLineHost = New CustomCmdLineHost() Dim engine As Engine = New Engine() host.TemplateFileValue = templateFileName 'Read the text template. Dim input As String = File.ReadAllText(templateFileName) 'Transform the text template. Dim output As String = engine.ProcessTemplate(input, host) Dim outputFileName As String = Path.GetFileNameWithoutExtension(templateFileName) outputFileName = Path.Combine(Path.GetDirectoryName(templateFileName), outputFileName) outputFileName = outputFileName & "1" & host.FileExtension File.WriteAllText(outputFileName, output, host.fileEncoding) Dim e As CompilerError For Each e In host.Errors Console.WriteLine(e.ToString()) Next End Sub 'ProcessTemplate End Class 'Program End NamespacePara Visual Basic somente, abra o projeto menu e clique Propriedades de CustomHost. No o objeto de inicialização , clique em CustomHost.Program.
No menu File, clique em Save All.
Sobre o Build menu, clique em Build Solution.
Teste o Host personalizado
Para testar o host personalizado, você escreve um modelo de texto, depois de executar o host personalizado, passe a ele o nome do modelo de texto e verificar que o modelo é transformado.
Para criar um modelo de texto para testar o host personalizado
Crie um arquivo de texto e nomeie- TestTemplate.tt.
Você pode usar qualquer editor de texto (por exemplo, bloco de notas) para criar o arquivo.
Adicione o seguinte arquivo:
.gif "Observação")
ObservaçãoA linguagem de programação do modelo de texto não precisa coincidir com o host personalizado.
Text Template Host Test <#@ template debug="true" #> <# //Uncomment this line to test that the host allows the engine to set the extension. #> <# //@ output extension=".htm" #> <# //Uncomment this line if you want to debug the generated transformation class. #> <# //System.Diagnostics.Debugger.Break(); #> <# for (int i=0; i<3; i++) { WriteLine("This is a test"); } #>Text Template Host Test <#@ template debug="true" language="VB"#> <# 'Uncomment this line to test that the host allows the engine to set the extension. #> <# '@ output extension=".htm" #> <# 'Uncomment this line if you want to debug the generated transformation class. #> <# 'System.Diagnostics.Debugger.Break() #> <# Dim i As Integer For i = 0 To 2 WriteLine("This is a test") Next #>Salve e feche o arquivo.
Para testar o host personalizado
Abra a janela de Prompt de comando.
Digite o caminho do arquivo executável do host personalizado, mas não pressione ENTER ainda.
Por exemplo, digite:
<YOUR PATH>CustomHost\bin\Debug\CustomHost.exe
ObservaçãoEm vez de digitar o endereço, você pode procurar o arquivo CustomHost.exe na Windows Explorer e arraste o arquivo para a janela do Prompt de comando.
Digite um espaço.
Digite o caminho do arquivo de modelo de texto e pressione ENTER.
Por exemplo, digite:
C:\<YOUR PATH>TestTemplate.tt
ObservaçãoEm vez de digitar o endereço, você pode procurar o arquivo TestTemplate.tt na Windows Explorer e arraste o arquivo para a janela do Prompt de comando.
O aplicativo de host personalizado é executado e conclui o processo de transformação do modelo de texto.
Em Windows Explorer, navegue até a pasta que contém o arquivo TestTemplate.tt.
Essa pasta também contém o arquivo TestTemplate1.txt.
Abra este arquivo para ver os resultados da transformação do modelo de texto.
A saída de texto gerado aparece e tem esta aparência:
Text Template Host Test This is a test This is a test This is a test
Próximas etapas
Esta explicação passo a passo, você criou um host de transformação do modelo de texto que suporta a funcionalidade básica de transformação. Você pode expandir o seu host para dar suporte a modelos de texto para chamar personalizado ou gerado de processadores de diretriz. Para obter mais informações, consulte Walkthrough: Connecting a Host to a Generated Directive Processor.