UnmanagedMarshal 類別

參考

定義

命名空間:: System.Reflection.Emit

組件:: mscorlib.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

警告

An alternate API is available: Emit the MarshalAs custom attribute instead. http://go.microsoft.com/fwlink/?linkid=14202

表示描述如何從 Managed 到 Unmanaged 程式碼封送處理欄位的類別。此類別無法獲得繼承。

public ref class UnmanagedMarshal sealed

[System.Serializable]
public sealed class UnmanagedMarshal

[System.Serializable]
[System.Obsolete("An alternate API is available: Emit the MarshalAs custom attribute instead. http://go.microsoft.com/fwlink/?linkid=14202")]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class UnmanagedMarshal

[<System.Serializable>]
type UnmanagedMarshal = class

[<System.Serializable>]
[<System.Obsolete("An alternate API is available: Emit the MarshalAs custom attribute instead. http://go.microsoft.com/fwlink/?linkid=14202")>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type UnmanagedMarshal = class

Public NotInheritable Class UnmanagedMarshal

繼承: Object
UnmanagedMarshal

屬性: SerializableAttribute ObsoleteAttribute ComVisibleAttribute

範例

下列程式代碼範例顯示過時 UnmanagedMarshal 類型的取代程序代碼。此範例會發出名為 EmitMarshalAs.dll的單一模組元件，其中包含名為 Sample的類型。此類型具有名為 Test的方法，其中一個參數類型 String為。程式代碼範例會將 MarshalAsAttribute 與套 UnmanagedType.BStr 用至參數。

您可以使用 Ildasm.exe (IL 反組譯程式) 來檢查發出的元件，並觀察參數標示 marshal(bstr)為。

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
using namespace System::Runtime::InteropServices;

void main()
{
    AppDomain^ myDomain = AppDomain::CurrentDomain;
    AssemblyName^ myAsmName = gcnew AssemblyName("EmitMarshalAs");

    AssemblyBuilder^ myAssembly = 
        myDomain->DefineDynamicAssembly(myAsmName, 
            AssemblyBuilderAccess::RunAndSave);

    ModuleBuilder^ myModule = 
        myAssembly->DefineDynamicModule(myAsmName->Name, 
            myAsmName->Name + ".dll");
 
    TypeBuilder^ myType = 
        myModule->DefineType("Sample", TypeAttributes::Public);

    MethodBuilder^ myMethod = 
        myType->DefineMethod("Test", MethodAttributes::Public,
            nullptr, gcnew array<Type^> { String::typeid });


    // Get a parameter builder for the parameter that needs the 
    // attribute, using the HasFieldMarshal attribute. In this
    // example, the parameter is at position 0 and has the name
    // "arg".
    ParameterBuilder^ pb = 
        myMethod->DefineParameter(0, 
            ParameterAttributes::HasFieldMarshal, "arg");

    // Get the MarshalAsAttribute constructor that takes an
    // argument of type UnmanagedType.
    //
    //Type^ maattrType = MarshalAsAttribute::typeid;
    ConstructorInfo^ ci = 
        (MarshalAsAttribute::typeid)->GetConstructor(
            gcnew array<Type^> { UnmanagedType::typeid });

    // Create a CustomAttributeBuilder representing the attribute,
    // specifying the necessary unmanaged type. In this case, 
    // UnmanagedType.BStr is specified.
    //
    CustomAttributeBuilder^ cabuilder = 
        gcnew CustomAttributeBuilder(
            ci, gcnew array<Object^> { UnmanagedType::BStr });

    // Apply the attribute to the parameter.
    //
    pb->SetCustomAttribute(cabuilder);


    ILGenerator^ il = myMethod->GetILGenerator();
    il->Emit(OpCodes::Ret);

    Type^ finished = myType->CreateType();
    myAssembly->Save(myAsmName->Name + ".dll");
}

using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.InteropServices;

public class Example
{
    public static void Main()
    {
        AppDomain myDomain = AppDomain.CurrentDomain;
        AssemblyName myAsmName = new AssemblyName("EmitMarshalAs");

        AssemblyBuilder myAssembly =
            myDomain.DefineDynamicAssembly(myAsmName,
                AssemblyBuilderAccess.RunAndSave);

        ModuleBuilder myModule =
            myAssembly.DefineDynamicModule(myAsmName.Name,
               myAsmName.Name + ".dll");

        TypeBuilder myType =
            myModule.DefineType("Sample", TypeAttributes.Public);

        MethodBuilder myMethod =
            myType.DefineMethod("Test", MethodAttributes.Public,
                null, new Type[] { typeof(string) });

        // Get a parameter builder for the parameter that needs the
        // attribute, using the HasFieldMarshal attribute. In this
        // example, the parameter is at position 0 and has the name
        // "arg".
        ParameterBuilder pb =
            myMethod.DefineParameter(0,
               ParameterAttributes.HasFieldMarshal, "arg");

        // Get the MarshalAsAttribute constructor that takes an
        // argument of type UnmanagedType.
        //
        ConstructorInfo ci =
            typeof(MarshalAsAttribute).GetConstructor(
                new Type[] { typeof(UnmanagedType) });

        // Create a CustomAttributeBuilder representing the attribute,
        // specifying the necessary unmanaged type. In this case,
        // UnmanagedType.BStr is specified.
        //
        CustomAttributeBuilder cabuilder =
            new CustomAttributeBuilder(
                ci, new object[] { UnmanagedType.BStr });

        // Apply the attribute to the parameter.
        //
        pb.SetCustomAttribute(cabuilder);

        // Emit a dummy method body.
        ILGenerator il = myMethod.GetILGenerator();
        il.Emit(OpCodes.Ret);

        Type finished = myType.CreateType();
        myAssembly.Save(myAsmName.Name + ".dll");
    }
}

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

Public Class Example

    Public Shared Sub Main()

        Dim myDomain As AppDomain = AppDomain.CurrentDomain
        Dim myAsmName As New AssemblyName("EmitMarshalAs")

        Dim myAssembly As AssemblyBuilder = _
            myDomain.DefineDynamicAssembly(myAsmName, _
                AssemblyBuilderAccess.RunAndSave)

        Dim myModule As ModuleBuilder = _
            myAssembly.DefineDynamicModule(myAsmName.Name, _
                myAsmName.Name & ".dll")

        Dim myType As TypeBuilder = _
            myModule.DefineType("Sample", TypeAttributes.Public)
        
        Dim myMethod As MethodBuilder = _
            myType.DefineMethod("Test", MethodAttributes.Public, _
                Nothing, new Type() { GetType(String) })


        ' Get a parameter builder for the parameter that needs the 
        ' attribute, using the HasFieldMarshal attribute. In this
        ' example, the parameter is at position 0 and has the name
        ' "arg".
        Dim pb As ParameterBuilder = _
            myMethod.DefineParameter(0, _
               ParameterAttributes.HasFieldMarshal, "arg")

        ' Get the MarshalAsAttribute constructor that takes an
        ' argument of type UnmanagedType.
        '
        Dim ciParameters() As Type = { GetType(UnmanagedType) }
        Dim ci As ConstructorInfo = _
            GetType(MarshalAsAttribute).GetConstructor(ciParameters)

        ' Create a CustomAttributeBuilder representing the attribute,
        ' specifying the necessary unmanaged type. In this case, 
        ' UnmanagedType.BStr is specified.
        '
        Dim ciArguments() As Object = { UnmanagedType.BStr }
        Dim cabuilder As New CustomAttributeBuilder(ci, ciArguments)

        ' Apply the attribute to the parameter.
        '
        pb.SetCustomAttribute(cabuilder)


        ' Emit a dummy method body.
        Dim il As ILGenerator = myMethod.GetILGenerator()
        il.Emit(OpCodes.Ret)

        myType.CreateType()
        myAssembly.Save(myAsmName.Name & ".dll")

    End Sub

End Class

備註

此程式代碼範例顯示這個過時類型的因應措施。

封送處理是封裝和解除封裝參數的程式，因此可以進行遠端過程調用。在封送處理期間，當 Managed 類型的格式與對應 Unmanaged 類型的格式不同時，字段可能會進行格式轉換。例如，您可能想要封送 String 處理類型為非受控 BSTR。運行時間會自動處理某些格式轉換。若要覆寫預設行為，您必須使用 UnmanagedMarshal 類別來定義格式轉換。

屬性

BaseType	已淘汰. 取得 Unmanaged 基底型別 (Base Type)。這個屬性是唯讀的。
ElementCount	已淘汰. 取得數字元素。這個屬性是唯讀的。
GetUnmanagedType	已淘汰. 指出 Unmanaged 型別。這個屬性是唯讀的。
IIDGuid	已淘汰. 取得 GUID。這個屬性是唯讀的。

方法

DefineByValArray(Int32)	已淘汰. 指定要封送處理的固定長度陣列 (ByValArray) 至 Unmanaged 程式碼。
DefineByValTStr(Int32)	已淘汰. 指定要封送處理的固定陣列緩衝區 (ByValTStr) 字串至 Unmanaged 程式碼。
DefineLPArray(UnmanagedType)	已淘汰. 指定要封送處理的 `LPArray` 至 Unmanaged 程式碼。 `LPArray` 的長度是由實際封送處理陣列大小在執行階段時決定的。
DefineSafeArray(UnmanagedType)	已淘汰. 指定要封送處理的 `SafeArray` 至 Unmanaged 程式碼。
DefineUnmanagedMarshal(UnmanagedType)	已淘汰. 指定將封送處理至 Unmanaged 程式碼的所指定型別。
Equals(Object)	已淘汰. 判斷指定的物件是否等於目前的物件。 (繼承來源 Object)
GetHashCode()	已淘汰. 做為預設雜湊函式。 (繼承來源 Object)
GetType()	已淘汰. 取得目前執行個體的 Type。 (繼承來源 Object)
MemberwiseClone()	已淘汰. 建立目前 Object 的淺層複製。 (繼承來源 Object)
ToString()	已淘汰. 傳回代表目前物件的字串。 (繼承來源 Object)

適用於

UnmanagedMarshal 類別

定義

範例

備註

屬性

方法

適用於

另請參閱

意見反應

其他資源