Allocates a block of memory.

  • oid * Alloc(

//The size of the requested memory block in bytes



[in] Specifies the size (in bytes) of the memory block to be allocated.

Return Values

Pointer to the allocated memory block

Memory block allocated successfully.


Insufficient memory available.


The IMalloc::Alloc method allocates a memory block in essentially the same way that the C Library malloc function does.

The initial contents of the returned memory block are undefined pics/OLE00090001.gif there is no guarantee that the block has been initialized, so you should initialize it in your code. The allocated block may be larger than cb bytes because of the space required for alignment and for maintenance information.

If cb is zero, IMalloc::Alloc allocates a zero-length item and returns a valid pointer to that item. If there is insufficient memory available, IMalloc::Alloc returns NULL.

Note Applications should always check the return value from this method, even when requesting small amounts of memory, because there is no guarantee the memory will be allocated.

See Also

IMalloc::Free, IMalloc::Realloc, CoTaskMemAlloc

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