FieldBuilder.SetOffset メソッドとは？ わかりやすく解説

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FieldBuilder.SetOffset メソッド

フィールド レイアウトを指定します。

名前空間: System.Reflection.Emit
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

Visual Basic (宣言)
Public Sub SetOffset ( _
    iOffset As Integer _
)
Visual Basic (使用法)
Dim instance As FieldBuilder
Dim iOffset As Integer

instance.SetOffset(iOffset)
C#
public void SetOffset (
    int iOffset
)
C++
public:
void SetOffset (
    int iOffset
)
J#
public void SetOffset (
    int iOffset
)
JScript
public function SetOffset (
    iOffset : int
)

パラメータ

iOffset

このフィールドを格納している型の中でのフィールドのオフセット。

例外例外
例外の種類条件

InvalidOperationException

外側の型が CreateType を使用して作成されています。

解説解説

SetOffset の使用方法については、次のコード例を参照してください。

Visual Basic
Imports System
Imports System.Runtime.InteropServices
Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit
Imports System.Security.Permissions
Imports System.Runtime.CompilerServices

Public Class FieldBuilder_Sample

   Public Shared Function
 CreateType(ByVal currentDomain As AppDomain)
 As Type

      ' Create an assembly.
      Dim myAssemblyName As New
 AssemblyName()
      myAssemblyName.Name = "DynamicAssembly"
      Dim myAssembly As AssemblyBuilder = currentDomain.DefineDynamicAssembly(myAssemblyName,
 _
                                          AssemblyBuilderAccess.RunAndSave)
      ' Create a dynamic module in Dynamic Assembly.
      Dim myModuleBuilder As ModuleBuilder
 = myAssembly.DefineDynamicModule("MyModule", _
                                            "MyModule.mod")
      ' Define a public class named "MyClass" in the assembly.
      Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType("MyClass",
 _
                                         TypeAttributes.Public)
      Dim myTypeBuilder2 As TypeBuilder = myModuleBuilder.DefineType("MyClass2",
 _
         TypeAttributes.Public Or TypeAttributes.BeforeFieldInit
 Or _
         TypeAttributes.SequentialLayout Or TypeAttributes.AnsiClass
 Or TypeAttributes.Sealed)
      Dim myFieldBuilder1 As FieldBuilder =
 myTypeBuilder2.DefineField("myBytes1", _
         GetType(Byte), FieldAttributes.Public)
      Dim myFieldBuilder2 As FieldBuilder =
 myTypeBuilder2.DefineField("myBytes2", _
         GetType(Byte), FieldAttributes.Public)
      Dim myFieldBuilder3 As FieldBuilder =
 myTypeBuilder2.DefineField("myErrorCode", _
         GetType(Short), FieldAttributes.Public)
      Dim myFieldBuilder4 As FieldBuilder =
 myTypeBuilder2.DefineField("myReserved1", _
         GetType(Short), FieldAttributes.Public)
      Dim myFieldBuilder5 As FieldBuilder =
 myTypeBuilder2.DefineField("myReserved2", _
         GetType(Short), FieldAttributes.Public)
      Dim myFieldBuilder6 As FieldBuilder =
 myTypeBuilder2.DefineField("myPathName", _
         GetType(Char()), FieldAttributes.Public)
      myFieldBuilder6.SetMarshal(UnmanagedMarshal.DefineByValArray(128))
      myFieldBuilder6.SetOffset(4)
      Dim myType1 As Type = myTypeBuilder2.CreateType()
      ' Create the PInvoke method for 'OpenFile' method of 'Kernel32.dll'.
      Dim myParameters As Type() = {GetType(String),
 myType1, GetType(System.UInt32)}
      Dim myMethodBuilder As MethodBuilder
 = myTypeBuilder.DefinePInvokeMethod("OpenFile",
 _
         "kernel32.dll", MethodAttributes.Public Or
 MethodAttributes.Static Or _
         MethodAttributes.HideBySig, CallingConventions.Standard, GetType(IntPtr),
 _
         myParameters, CallingConvention.Winapi, CharSet.None)
      Dim myAttributeType As Type = GetType(MethodImplAttribute)
      Dim myConstructorInfo As ConstructorInfo
 = myAttributeType.GetConstructor(New Type(0) _
         {GetType(MethodImplOptions)})
      Dim myAttributeBuilder As New
 CustomAttributeBuilder(myConstructorInfo, _
         New Object() {MethodImplOptions.PreserveSig})
      myMethodBuilder.SetCustomAttribute(myAttributeBuilder)
      Dim myParameterBuilder2 As ParameterBuilder
 = myMethodBuilder.DefineParameter(2, _
         ParameterAttributes.Out, "myClass2")
      Dim myType As Type = myTypeBuilder.CreateType()
      myAssembly.Save("EmittedAssembly.dll")
      Return myType
   End Function 'CreateType

   <PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")>
 _
   Public Shared Sub Main()
      Try
         Dim myType As Type = CreateType(Thread.GetDomain())
         Dim myClass2 As Type = myType.Module.GetType("MyClass2")
         Dim myParam2 As Object
 = Activator.CreateInstance(myClass2)
         Dim myUint As System.UInt32
         myUint.Parse("800")

         Dim myArgs As Object()
 = {"MyFile.Txt", myParam2, myUint}
         Dim myObject As Object
 = myType.InvokeMember("OpenFile", _
                                    BindingFlags.Public Or BindingFlags.InvokeMethod
 Or _
                                    BindingFlags.Static, Nothing,
 Nothing, myArgs)
         Console.WriteLine("MyClass.OpenFile method returned: '{0}'",
 myObject)
      Catch e As Exception
         Console.WriteLine("Exception Caught: " &
 e.Message)
      End Try
   End Sub 'Main
End Class 'FieldBuilder_Sample
C#
using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
using System.Security.Permissions;
using System.Runtime.CompilerServices;

public class FieldBuilder_Sample
{
   public static Type CreateType(AppDomain
 currentDomain)
   {
      // Create an assembly.
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "DynamicAssembly";
      AssemblyBuilder myAssembly =
         currentDomain.DefineDynamicAssembly(myAssemblyName,AssemblyBuilderAccess.RunAndSave);
      // Create a dynamic module in Dynamic Assembly.
      ModuleBuilder myModuleBuilder=myAssembly.DefineDynamicModule("MyModule"
,"MyModule.mod");
      // Define a public class named "MyClass" in the assembly.
      TypeBuilder myTypeBuilder= myModuleBuilder.DefineType("MyClass",TypeAttributes.Public);
      TypeBuilder myTypeBuilder2 = myModuleBuilder.DefineType("MyClass2"
,
         TypeAttributes.Public|TypeAttributes.BeforeFieldInit|TypeAttributes.SequentialLayout|TypeAttributes.AnsiClass|TypeAttributes.Sealed);
      FieldBuilder myFieldBuilder1= myTypeBuilder2.DefineField("myBytes1"
,
                                    typeof(byte),FieldAttributes.Public);
      FieldBuilder myFieldBuilder2= myTypeBuilder2.DefineField("myBytes2"
,
                                    typeof(byte),FieldAttributes.Public);
      FieldBuilder myFieldBuilder3= myTypeBuilder2.DefineField("myErrorCode"
,
                                    typeof(short),FieldAttributes.Public);
      FieldBuilder myFieldBuilder4= myTypeBuilder2.DefineField("myReserved1"
,
                                    typeof(short),FieldAttributes.Public);
      FieldBuilder myFieldBuilder5= myTypeBuilder2.DefineField("myReserved2"
,
                                    typeof(short),FieldAttributes.Public);
      FieldBuilder myFieldBuilder6= myTypeBuilder2.DefineField("myPathName"
,
                                    typeof(char[]),FieldAttributes.Public);
      myFieldBuilder6.SetMarshal(UnmanagedMarshal.DefineByValArray(128)); 
      myFieldBuilder6.SetOffset(4);
      Type myType1 = myTypeBuilder2.CreateType();  
      // Create the PInvoke method for 'OpenFile' method of 'Kernel32.dll'.
      Type[] myParameters={ typeof(string), myType1 ,typeof(uint)};
 
      MethodBuilder myMethodBuilder= myTypeBuilder.DefinePInvokeMethod("OpenFile"
,
                                     "kernel32.dll",MethodAttributes.Public|MethodAttributes.Static|MethodAttributes.HideBySig
,
                                       CallingConventions.Standard,typeof(IntPtr)
,
                                       myParameters,CallingConvention.Winapi,CharSet.None);
      Type myAttributeType = typeof(MethodImplAttribute);
      ConstructorInfo myConstructorInfo = 
         myAttributeType.GetConstructor(new Type[1]{typeof(MethodImplOptions)});
      CustomAttributeBuilder myAttributeBuilder = new CustomAttributeBuilder(myConstructorInfo
,
                                                   new object[1]{MethodImplOptions.PreserveSig});
      myMethodBuilder.SetCustomAttribute(myAttributeBuilder);
      ParameterBuilder myParameterBuilder2=myMethodBuilder.DefineParameter(2,
                                            ParameterAttributes.Out,"myClass2");
      Type myType=myTypeBuilder.CreateType();
      myAssembly.Save("EmittedAssembly.dll");
      return myType;
   }

   [PermissionSetAttribute(SecurityAction.Demand, Name="FullTrust")]
   public static void Main()
   {
      try
      {
         Type myType = CreateType(Thread.GetDomain());
         Type myClass2 = myType.Module.GetType("MyClass2"); 
         object myParam2 = Activator.CreateInstance(myClass2);
         uint myUint=0x00000800;
         object[] myArgs= {"MyFile.Txt",myParam2,myUint};
         Object myObject  = myType.InvokeMember("OpenFile",BindingFlags.Public
 | 
            BindingFlags.InvokeMethod | BindingFlags.Static,null
,null,myArgs);
         Console.WriteLine("MyClass.OpenFile method returned: \"{0}\"",
 myObject);
      }
      catch(Exception e)
      {
         Console.WriteLine("Exception Caught "+e.Message);
      }
   }

}
C++
using namespace System;
using namespace System::Runtime::InteropServices;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
using namespace System::Runtime::CompilerServices;
Type^ CreateType( AppDomain^ currentDomain )
{
   // Create an assembly.
   AssemblyName^ myAssemblyName = gcnew AssemblyName;
   myAssemblyName->Name = "DynamicAssembly";
   AssemblyBuilder^ myAssembly = currentDomain->DefineDynamicAssembly( myAssemblyName,
 AssemblyBuilderAccess::RunAndSave );

   // Create a dynamic module in Dynamic Assembly.
   ModuleBuilder^ myModuleBuilder = myAssembly->DefineDynamicModule( "MyModule",
 "MyModule.mod" );

   // Define a public class named S"MyClass" in the assembly.
   TypeBuilder^ myTypeBuilder = myModuleBuilder->DefineType( "MyClass",
 TypeAttributes::Public );
   TypeBuilder^ myTypeBuilder2 = myModuleBuilder->DefineType( "MyClass2",
 static_cast<TypeAttributes>(TypeAttributes::Public | TypeAttributes::BeforeFieldInit
 | TypeAttributes::SequentialLayout | TypeAttributes::AnsiClass | TypeAttributes::Sealed) );
   FieldBuilder^ myFieldBuilder1 = myTypeBuilder2->DefineField( "myBytes1",
 Byte::typeid, FieldAttributes::Public );
   FieldBuilder^ myFieldBuilder2 = myTypeBuilder2->DefineField( "myBytes2",
 Byte::typeid, FieldAttributes::Public );
   FieldBuilder^ myFieldBuilder3 = myTypeBuilder2->DefineField( "myErrorCode",
 short::typeid, FieldAttributes::Public );
   FieldBuilder^ myFieldBuilder4 = myTypeBuilder2->DefineField( "myReserved1",
 short::typeid, FieldAttributes::Public );
   FieldBuilder^ myFieldBuilder5 = myTypeBuilder2->DefineField( "myReserved2",
 short::typeid, FieldAttributes::Public );
   FieldBuilder^ myFieldBuilder6 = myTypeBuilder2->DefineField( "myPathName",
 array<char>::typeid,FieldAttributes::Public );
   myFieldBuilder6->SetMarshal( UnmanagedMarshal::DefineByValArray( 128 ) );
   myFieldBuilder6->SetOffset( 4 );
   Type^ myType1 = myTypeBuilder2->CreateType();

   // Create the PInvoke method for 'OpenFile' method of 'Kernel32.dll'.
   array<Type^>^myParameters = {String::typeid,myType1,UInt32::typeid};
   MethodBuilder^ myMethodBuilder = myTypeBuilder->DefinePInvokeMethod( "OpenFile",
 "kernel32.dll", static_cast<MethodAttributes>(MethodAttributes::Public
 | MethodAttributes::Static | MethodAttributes::HideBySig), CallingConventions::Standard, IntPtr::typeid, myParameters, CallingConvention::Winapi, CharSet::None );
   Type^ myAttributeType = MethodImplAttribute::typeid;
   array<Type^>^type1 = {MethodImplOptions::typeid};
   ConstructorInfo^ myConstructorInfo = myAttributeType->GetConstructor( type1
 );
   array<Object^>^obj1 = {MethodImplOptions::PreserveSig};
   CustomAttributeBuilder^ myAttributeBuilder = gcnew CustomAttributeBuilder( myConstructorInfo,obj1
 );
   myMethodBuilder->SetCustomAttribute( myAttributeBuilder );
   ParameterBuilder^ myParameterBuilder2 = myMethodBuilder->DefineParameter( 2,
 ParameterAttributes::Out, "myClass2" );
   Type^ myType = myTypeBuilder->CreateType();
   myAssembly->Save( "EmittedAssembly.dll" );
   return myType;
}

int main()
{
   try
   {
      Type^ myType = CreateType( Thread::GetDomain() );
      Type^ myClass2 = myType->Module->GetType( "MyClass2" );
      Object^ myParam2 = Activator::CreateInstance( myClass2 );
      UInt32 myUint = 0x00000800;
      array<Object^>^myArgs = {"MyFile.Txt",myParam2,myUint};
      Object^ myObject = myType->InvokeMember( "OpenFile", static_cast<BindingFlags>(BindingFlags::Public
 | BindingFlags::InvokeMethod | BindingFlags::Static), nullptr, nullptr, myArgs
 );
      Console::WriteLine( "MyClass::OpenFile method returned: \"{0}\"",
 myObject );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception Caught {0}", e->Message );
   }
}
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
参照参照
関連項目
FieldBuilder クラス
FieldBuilder メンバ
System.Reflection.Emit 名前空間

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Weblioのサービス

FieldBuilder.SetOffset メソッドのお隣キーワード

FieldBuilder.Module プロパティ

FieldBuilder.Name プロパティ

FieldBuilder.ReflectedType プロパティ

FieldBuilder.SetConstant メソッド

FieldBuilder.SetCustomAttribute メソッド

FieldBuilder.SetMarshal メソッド

FieldBuilder.SetOffset メソッド

FieldBuilder.SetValue メソッド

FieldBuilder.System.Runtime.InteropServices._FieldBuilder.GetIDsOfNames メソッド

FieldBuilder.System.Runtime.InteropServices._FieldBuilder.GetTypeInfo メソッド

FieldBuilder.System.Runtime.InteropServices._FieldBuilder.GetTypeInfoCount メソッド

FieldBuilder.System.Runtime.InteropServices._FieldBuilder.Invoke メソッド

FieldCallback デリゲート

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