Marshal.GetIUnknownForObjectInContext(Object) Method

Reference

Definition

Namespace:: System.Runtime.InteropServices

Assembly:: mscorlib.dll

Important

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Returns an IUnknown interface from a managed object, if the caller is in the same context as that object.

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

Parameters

o: Object

The object whose IUnknown interface is requested.

Returns

IntPtr

nativeint

The IUnknown pointer for the specified object, or null if the caller is not in the same context as the specified object.

Attributes: SecurityCriticalAttribute

Examples

The following example demonstrates how to retrieve an IUnknown interface for a managed object using the GetIUnknownForObjectInContext method.

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

Remarks

This method is the same as GetIUnknownForObject except that it returns null if the caller is not in the same context as the object.

Applies to