Marshal.GetIUnknownForObjectInContext Method (Object)
Returns an IUnknown interface from a managed object, if the caller is in the same context as that object.
Assembly: mscorlib (in mscorlib.dll)
<SecurityCriticalAttribute> Public Shared Function GetIUnknownForObjectInContext ( o As Object ) As IntPtr
The object whose IUnknown interface is requested.
Return ValueType: System.IntPtr
The IUnknown pointer for the specified object, or null if the caller is not in the same context as the specified object.
This method is the same as GetIUnknownForObject except that it returns null if the caller is not in the same context as the object.
The following example demonstrates how to retrieve an IUnknown interface for a managed object using themethod.
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
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.
Available since 2.0