Marshal.GetIUnknownForObjectInContext Method
.NET Framework 4
Returns an IUnknown interface from a managed object, if the caller is in the same context as that object.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- o
- Type: System.Object
The object whose IUnknown interface is requested.
Return Value
Type: System.IntPtrThe 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 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(); } }
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SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
