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IMalloc interface

Allocates, frees, and manages memory.

When to implement

Generally, you should not implement IMalloc, instead using the COM implementation, which is guaranteed to be thread-safe in managing task memory. You get a pointer to the COM task allocator object's IMalloc through a call to the CoGetMalloc function.

When to use

Call the methods of IMalloc to allocate and manage memory. The COM libraries and object handlers also call the IMalloc methods to manage memory. Object handlers should call CoGetMalloc to get a pointer to the IMalloc implementation on the task allocator object and use the implementation of those methods to manage task memory.

The IMalloc methods Alloc, Free, and Realloc are similar to the C library functions malloc, free, and realloc. For debugging, refer to the functions CoRegisterMallocSpy and CoRevokeMallocSpy.

Members

The IMalloc interface inherits from the IUnknown interface. IMalloc also has these types of members:

Methods

The IMalloc interface has these methods.

MethodDescription
Alloc

Allocates a block of memory.

DidAlloc

Determines whether this allocator was used to allocate the specified block of memory.

Free

Frees a previously allocated block of memory.

GetSize

Retrieves the size of a previously allocated block of memory.

HeapMinimize

Minimizes the heap as much as possible by releasing unused memory to the operating system, coalescing adjacent free blocks, and committing free pages.

Realloc

Changes the size of a previously allocated block of memory.

 

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

ObjIdl.h

IDL

ObjIdl.idl

IID

IID_IMalloc is defined as 00000002-0000-0000-C000-000000000046

See also

CoGetMalloc
CoRegisterMallocSpy
CoRevokeMallocSpy
IMallocSpy

 

 

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