Marshal.ChangeWrapperHandleStrength Method

Changes the strength of a COM callable wrapper's (CCW) handle on the object it contains.

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

public static void ChangeWrapperHandleStrength (
	Object otp,
	bool fIsWeak
public static void ChangeWrapperHandleStrength (
	Object otp, 
	boolean fIsWeak
public static function ChangeWrapperHandleStrength (
	otp : Object, 
	fIsWeak : boolean



The object whose COM callable wrapper (CCW) holds a reference counted handle. The handle is strong if the reference count on the CCW is greater than zero; otherwise it is weak.


true to change the strength of the handle on the otp parameter to weak, regardless of its reference count; false to reset the handle strength on otp to be reference counted.

ChangeWrapperHandleStrength is used for object pooling functionality and should never be called by user code directly.


This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

Community Additions