Marshal.GetIUnknownForObjectInContext(Object) 方法

  • 參考

定義

命名空間:
System.Runtime.InteropServices
組件:
mscorlib.dll

從 Managed 物件傳回 IUnknown 介面 (如果呼叫端與該物件位於相同內容的話)。

public:
 static IntPtr GetIUnknownForObjectInContext(System::Object ^ o);
public static IntPtr GetIUnknownForObjectInContext (object o);
[System.Security.SecurityCritical]
public static IntPtr GetIUnknownForObjectInContext (object o);
static member GetIUnknownForObjectInContext : obj -> nativeint
[<System.Security.SecurityCritical>]
static member GetIUnknownForObjectInContext : obj -> nativeint
Public Shared Function GetIUnknownForObjectInContext (o As Object) As IntPtr

參數

o
Object

其 IUnknown 介面受要求的物件。

傳回

IntPtr

nativeint

指定之物件的 IUnknown 指標，如果呼叫端與指定的物件位於不同內容時，則為 null。

屬性
SecurityCriticalAttribute

範例

下列範例示範如何使用 方法來擷取 IUnknown Managed 物件的 GetIUnknownForObjectInContext 介面。

using System;
using System.Runtime.InteropServices;

class Program
{

    static void Run()
    {

        // Create an int object
        int obj = 1;

        Console.WriteLine("Calling Marshal.GetIUnknownForObjectInContext...");

        // Get the IUnKnown pointer for the Integer object
        IntPtr pointer = Marshal.GetIUnknownForObjectInContext(obj);

        Console.WriteLine("Calling Marshal.Release...");

        // Always call Marshal.Release to decrement the reference count.
        Marshal.Release(pointer);
    }

    static void Main(string[] args)
    {
        Run();
    }
}

Imports System.Runtime.InteropServices

Module Program


    Sub Run()

        ' Dim an Integer object
        Dim IntegerObject As Integer = 1

        ' Dim a pointer
        Dim pointer As IntPtr

        Console.WriteLine("Calling Marshal.GetIUnknownForObjectInContext...")

        ' Get the IUnKnown pointer for the Integer object
        pointer = Marshal.GetIUnknownForObjectInContext(IntegerObject)

        Console.WriteLine("Calling Marshal.Release...")

        ' Always call Marshal.Release to decrement the reference count.
        Marshal.Release(pointer)



    End Sub

    Sub Main(ByVal args() As String)

        Run()

    End Sub

End Module

備註

這個方法與 相同 GetIUnknownForObject ，不同之處在于，如果呼叫端不在與 物件相同的內容中，則會傳回 null 此方法。

適用於

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