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Marshal.GetComInterfaceForObject Method (Object, Type, CustomQueryInterfaceMode)

Returns a pointer to an IUnknown interface that represents the specified interface on the specified object. Custom query interface access is controlled by the specified customization mode.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

public static IntPtr GetComInterfaceForObject(
	Object o,
	Type T,
	CustomQueryInterfaceMode mode


Type: System.Object
The object that provides the interface.
Type: System.Type
The type of interface that is requested.
Type: System.Runtime.InteropServices.CustomQueryInterfaceMode
One of the enumeration values that indicates whether to apply an IUnknown::QueryInterface customization that is supplied by an ICustomQueryInterface.

Return Value

Type: System.IntPtr
The interface pointer that represents the interface for the object.


The T parameter is not an interface.


The type is not visible to COM.


The T parameter is a generic type.


The object o does not support the requested interface.


The o parameter is null.


The T parameter is null.

GetComInterfaceForObject(Object, Type, CustomQueryInterfaceMode) lets you specify whether to apply query interface customization. Use the GetComInterfaceForObject(Object, Type) overload to apply query interface customization by default.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

  • 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 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.