Marshal.StructureToPtr Method (Object, IntPtr, Boolean)
Marshals data from a managed object to an unmanaged block of memory.
Assembly: mscorlib (in mscorlib.dll)
[<SecurityCriticalAttribute>] [<ComVisibleAttribute(true)>] static member StructureToPtr : structure:Object * ptr:nativeint * fDeleteOld:bool -> unit
A managed object that holds the data to be marshaled. This object must bea structure oran instance of a formatted class.
A pointer to an unmanaged block of memory, which must be allocated before this method is called.
structure is a reference type that is not a formatted class.
structure is a generic type.
If structure is a value type, it can be boxed or unboxed. If it is boxed, it is unboxed before copying.
System.Object), the managed objects are kept alive with reference counts. All other reference types (for example, strings and arrays) are marshaled to copies. To release these managed or unmanaged objects, you must call the Marshal.DestroyStructuremethod before you free the memory block.copies the contents of structure to the pre-allocated block of memory that the ptr parameter points to. If structure contains reference types that marshal to COM interface pointers (interfaces, classes without layout, and
If you use themethod to copy a different instance to the memory block at a later time, specify true for fDeleteOld to remove reference counts for reference types in the previous instance. Otherwise, the managed reference typesand unmanaged copies are effectively leaked.
The overall pattern for usingis as follows:
On the first call to themethod after a memory block has been allocated, fDeleteOldmust befalse, because there are no contents to clear.
Specify true for fDeleteOld only if the block contains valid data.
If you copy a different instance to the memory block, and the object contains reference types, fDeleteOld must be true to free reference types in the old contents.
If the object contains reference types, you must call the DestroyStructure method before you free the memory block.
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.
Available since 4.5
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 8.1