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Marshal.FreeCoTaskMem Method

.NET Framework 3.5

Other Versions

Frees a block of memory allocated by the unmanaged COM task memory allocator with Marshal.AllocCoTaskMem.

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

Syntax

C++

JScript

Copy

[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
public static void FreeCoTaskMem(
	IntPtr ptr
)

Parameters

ptr: Type: System.IntPtr
The address of the memory to be freed.

Remarks

You can use FreeCoTaskMem to free any memory allocated by AllocCoTaskMem, ReAllocCoTaskMem, or any equivalent unmanaged API. If the ptr parameter is null, the method does nothing.

FreeCoTaskMem exposes the CoTaskMemFree COM API function, which frees all bytes so that you can no longer use the memory pointed to by the ptr parameter. For additional information about CoTaskMemFree, see the MSDN library.

In addition to FreeCoTaskMem, the Marshal class provides two other memory-deallocation methods: Marshal.DestroyStructure and Marshal.FreeHGlobal.

Note:
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.

Note:

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.

.NET Framework Security

SecurityPermission
for permission to call unmanaged code.
Associated enumeration: UnmanagedCode Security action: LinkDemand

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

Version Information