TypeBuilder.DefineUninitializedData(String, Int32, FieldAttributes) メソッド

定義

名前空間:

System.Reflection.Emit

アセンブリ:

System.Reflection.Emit.dll

ソース:

TypeBuilder.cs

ポータブル実行可能 (PE) ファイルの .sdata セクションの初期化されていないデータ フィールドを定義します。

public:
 System::Reflection::Emit::FieldBuilder ^ DefineUninitializedData(System::String ^ name, int size, System::Reflection::FieldAttributes attributes);

public System.Reflection.Emit.FieldBuilder DefineUninitializedData (string name, int size, System.Reflection.FieldAttributes attributes);

member this.DefineUninitializedData : string * int * System.Reflection.FieldAttributes -> System.Reflection.Emit.FieldBuilder

Public Function DefineUninitializedData (name As String, size As Integer, attributes As FieldAttributes) As FieldBuilder

パラメーター

name

String

データを参照するために使用する名前。 name に埋め込み null 値を含めることはできません。

size

Int32

データ フィールドのサイズ。

attributes

FieldAttributes

フィールドの属性。

戻り値

FieldBuilder

データを参照するフィールド。

例外

ArgumentException

name の長さが 0 です。

- または -

size が 0 以下か、0x003f0000 以上です。

ArgumentNullException

name が nullです。

InvalidOperationException

型は CreateType() を使用して既に作成されました。

例

次のコード サンプルは、 を使用 DefineUninitializedData して、動的型で初期化されていないデータ フィールドを作成する方法を示しています。

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
using namespace System::Runtime::InteropServices;
using namespace System::Security::Permissions;

public ref class Example
{
public:
   [SecurityPermission(SecurityAction::Demand, Flags=SecurityPermissionFlag::UnmanagedCode)]
   static void Main()
   {
      Type^ myHelloWorldType = CreateCallee( Thread::GetDomain() );
      Object^ myHelloWorldInstance = Activator::CreateInstance( myHelloWorldType );
      FieldInfo^ myGreetingFieldInfo = myHelloWorldType->GetField( "MyGreeting" );
      Object^ oval = Activator::CreateInstance( myGreetingFieldInfo->FieldType );
      IntPtr myIntPtr = Marshal::AllocHGlobal( 4 );
      Random^ rand = gcnew Random;
      int iTempSeed = rand->Next();
      array<Byte>^bINITBYTE = GetRandBytes( iTempSeed, 4 );
      IntPtr intptrTemp = myIntPtr;
      for ( int j = 0; j < 4; j++ )
      {
         Marshal::WriteByte( myIntPtr, bINITBYTE[ j ] );
         myIntPtr = (IntPtr)((int)myIntPtr + 1);

      }
      myIntPtr = intptrTemp;
      Object^ oValNew = Marshal::PtrToStructure( myIntPtr, myGreetingFieldInfo->FieldType );
      Marshal::FreeHGlobal( myIntPtr );
      myIntPtr = Marshal::AllocHGlobal( 4 );
      Object^ myObj = myGreetingFieldInfo->GetValue( myHelloWorldInstance );
      Marshal::StructureToPtr( myObj, myIntPtr, true );
      intptrTemp = myIntPtr;
      Console::WriteLine( "The value of 'MyGreeting' field : " );
      for ( int j = 0; j < 4; j++ )
      {
         Marshal::WriteByte( myIntPtr, bINITBYTE[ j ] );
         Console::WriteLine( bINITBYTE[ j ] );
         myIntPtr = (IntPtr)((int)myIntPtr + 1);

      }
   }


private:
   static array<Byte>^ GetRandBytes( int iRandSeed, int iSize )
   {
      array<Byte>^barr = gcnew array<Byte>(iSize);
      Random^ randTemp = gcnew Random( iRandSeed );
      randTemp->NextBytes( barr );
      return barr;
   }


   // Create the callee transient dynamic assembly.
   static Type^ CreateCallee( AppDomain^ myDomain )
   {
      
      // Create a simple name for the callee assembly.
      AssemblyName^ myAssemblyName = gcnew AssemblyName;
      myAssemblyName->Name = "EmittedClass";
      
      // Create the callee dynamic assembly.
      AssemblyBuilder^ myAssembly = myDomain->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::Run );
      
      // Create a dynamic module in the callee assembly.
      ModuleBuilder^ myModule = myAssembly->DefineDynamicModule( "EmittedModule" );
      
      // Define a public class named "MyHelloWorld"
      TypeBuilder^ myHelloWorldType = myModule->DefineType( "MyHelloWorld", TypeAttributes::Public );
      
      // Define a 'MyGreeting' field and initialize it.
      FieldBuilder^ myFieldBuilder = myHelloWorldType->DefineUninitializedData( "MyGreeting", 4, FieldAttributes::Public );
      
      // Create the 'MyHelloWorld' class.
      return (myHelloWorldType->CreateType());
   }

};

int main()
{
   Example::Main();
}

using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.InteropServices;
using System.Security.Permissions;

public sealed class Example
{
   public static void Main()
   {
      Type myHelloWorldType = CreateCallee(Thread.GetDomain());
      object myHelloWorldInstance =
      Activator.CreateInstance(myHelloWorldType);
      FieldInfo myGreetingFieldInfo =
      myHelloWorldType.GetField("MyGreeting");
      object oval = Activator.CreateInstance(myGreetingFieldInfo.FieldType);
      IntPtr myIntPtr = Marshal.AllocHGlobal(4);
      Random rand = new Random();
      int iTempSeed = rand.Next();
      byte[] bINITBYTE = GetRandBytes( iTempSeed, 4);
      IntPtr intptrTemp = myIntPtr;
      for ( int j = 0; j < 4; j++ )
      {
         Marshal.WriteByte( myIntPtr, bINITBYTE[j]);
         myIntPtr = (IntPtr)((int)myIntPtr + 1);
      }
      myIntPtr = intptrTemp;
      Object oValNew = Marshal.PtrToStructure( myIntPtr, myGreetingFieldInfo.FieldType);
      Marshal.FreeHGlobal( myIntPtr );

      myIntPtr = Marshal.AllocHGlobal(4);
      object myObj = myGreetingFieldInfo.GetValue(myHelloWorldInstance);
      Marshal.StructureToPtr(myObj, myIntPtr, true);
      intptrTemp = myIntPtr;
      Console.WriteLine("The value of 'MyGreeting' field : ");
      for ( int j = 0; j < 4; j++ )
      {
         Marshal.WriteByte( myIntPtr, bINITBYTE[j]);
         Console.WriteLine(bINITBYTE[j]);
         myIntPtr = (IntPtr)((int)myIntPtr + 1);
      }
   }

   private static byte[] GetRandBytes( int iRandSeed, int iSize )
   {
      byte[] barr = new byte[iSize];
      Random randTemp = new Random( iRandSeed );
      randTemp.NextBytes( barr );
      return barr;
   }

   // Create the callee transient dynamic assembly.
   private static Type CreateCallee(AppDomain myDomain)
   {
      // Create a simple name for the callee assembly.
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "EmittedClass";

      // Create the callee dynamic assembly.
      AssemblyBuilder myAssembly =
         myDomain.DefineDynamicAssembly(myAssemblyName,AssemblyBuilderAccess.Run);

      // Create a dynamic module in the callee assembly.
      ModuleBuilder myModule =
         myAssembly.DefineDynamicModule("EmittedModule");

      // Define a public class named "MyHelloWorld"
      TypeBuilder myHelloWorldType =
         myModule.DefineType("MyHelloWorld", TypeAttributes.Public);

      // Define a 'MyGreeting' field and initialize it.
      FieldBuilder myFieldBuilder =
         myHelloWorldType.DefineUninitializedData("MyGreeting",4,FieldAttributes.Public);

      // Create the 'MyHelloWorld' class.
      return(myHelloWorldType.CreateType());
   }

   private Example() {}
}

Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit
Imports System.Runtime.InteropServices


Module Example

   Sub Main()
      Dim myHelloWorldType As Type = CreateCallee(Thread.GetDomain())
      Dim myHelloWorldInstance As Object = Activator.CreateInstance(myHelloWorldType)
      Dim myGreetingFieldInfo As FieldInfo = myHelloWorldType.GetField("MyGreeting")
      Dim oval As Object = Activator.CreateInstance(myGreetingFieldInfo.FieldType)
      Dim myIntPtr As IntPtr = Marshal.AllocHGlobal(4)
      Dim rand As New Random()
      Dim iTempSeed As Integer = rand.Next()
      Dim bINITBYTE As Byte() = GetRandBytes(iTempSeed, 4)
      Dim intptrTemp As IntPtr = myIntPtr
      Dim j As Integer
      For j = 0 To 3
         Marshal.WriteByte(myIntPtr, bINITBYTE(j))
         myIntPtr = intptr.op_Explicit(myIntPtr.ToInt32 + 1)
      Next j
      myIntPtr = intptrTemp
      Dim oValNew As [Object] = Marshal.PtrToStructure(myIntPtr, myGreetingFieldInfo.FieldType)
      Marshal.FreeHGlobal(myIntPtr)

      myIntPtr = Marshal.AllocHGlobal(4)
      Dim myObj As Object = myGreetingFieldInfo.GetValue(myHelloWorldInstance)
      Marshal.StructureToPtr(myObj, myIntPtr, True)
      intptrTemp = myIntPtr
      Console.WriteLine("The value of 'MyGreeting' field : ")

      For j = 0 To 3
         Marshal.WriteByte(myIntPtr, bINITBYTE(j))
         Console.WriteLine(bINITBYTE(j))
         myIntPtr = intptr.op_Explicit(myIntPtr.ToInt32 + 1)
      Next j
   End Sub


   Private Function GetRandBytes(ByVal iRandSeed As Integer, ByVal iSize As Integer) As Byte()
      Dim barr(iSize) As Byte
      Dim randTemp As New Random(iRandSeed)
      randTemp.NextBytes(barr)
      Return barr
   End Function 'GetRandBytes


   ' Create the callee transient dynamic assembly.
   Private Function CreateCallee(ByVal myDomain As AppDomain) As Type
      ' Create a simple name for the callee assembly.
      Dim myAssemblyName As New AssemblyName()
      myAssemblyName.Name = "EmittedClass"

      ' Create the callee dynamic assembly.
      Dim myAssembly As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.Run)


      ' Create a dynamic module in the callee assembly.
      Dim myModule As ModuleBuilder = myAssembly.DefineDynamicModule("EmittedModule")

      ' Define a public class named "MyHelloWorld"
      Dim myHelloWorldType As TypeBuilder = myModule.DefineType("MyHelloWorld", TypeAttributes.Public)

      ' Define a 'MyGreeting' field and initialize it.
      Dim myFieldBuilder As FieldBuilder = myHelloWorldType.DefineUninitializedData("MyGreeting", 4, FieldAttributes.Public)

      ' Create the 'MyHelloWorld' class.
      Return myHelloWorldType.CreateType()
   End Function 'CreateCallee

End Module

注釈

このメソッドで作成するフィールドは、 staticパラメーターに を含 FieldAttributes.Static めていなくても になります attributes 。