Memory Management Functions

General memory functions

The following functions are used in memory management.

Function	Description
Copymemory	Copies a block of memory from one location to another. Copy the memory. The first parameter is the destination address, the second parameter is the source address, and the third parameter is the size of the copied data, in bytes.
Creatememoryresourcenotification	Creates a memory resource notification object.
Fillmemory	Fills a block of memory with a specified value. Fill in the memory, fill a piece of memory into the same value.
Getlargepageminimum	Retrieves the minimum size of a large page.
Getsystemfilecachesize	Retrieves the current size limits for the working set of the system cache.
Getwritewatch	Retrieves the addresses of the pages that have been written to in a region of virtual memory.
Globalmemorystatus	Obtains information about the system's current usage of both physical and virtual memory.
Globalmemorystatusex	Obtains information about the system's current usage of both physical and virtual memory.
Movememory	Moves a block of memory from one location to another. The function class is copymemory, but the source address and destination address can be the same.
Querymemoryresourcenotification	Retrieves the state of the specified memory resource object.
Resetwritewatch	Resets the write-tracking State for a region of virtual memory.
Securezeromemory	Fills a block of memory with zeros.
Setsystemfilecachesize	Limits the size of the working set for the file system cache.
Zeromemory	Fills a block of memory with zeros. clears the specified memory area.

Data Execution Prevention functions

The following functions are used with Data Execution Prevention (DEP ).

Function	Description
Getprocessdeppolicy	Retrieves Dep settings for a process.
Getsystemdeppolicy	Retrieves Dep settings for the system.
Setprocessdeppolicy	Changes Dep settings for a process.

File mapping functions

The following functions are used in file mapping.

Function	Description
Createfilemapping	Creates or opens a named or unnamed file mapping object for a specified file.
Createfilemappingnuma	Creates or opens a named or unnamed file mapping object for a specified file, and specifies the NUMA node for the physical memory.
Flushviewoffile	Writes to the disk a byte range within a mapped view of a file.
Getmappedfilename	Checks whether the specified address is within a memory-mapped file in the address space of the specified process. If so, the function returns the name of the memory-mapped file.
Mapviewoffile	Maps a view of a file mapping into the address space of a calling process.
Mapviewoffileex	Maps a view of a file mapping into the address space of a calling process. A caller can optionally specify a suggested memory address for the view.
Mapviewoffileexnuma	Maps a view of a file mapping into the address space of a calling process, and specifies the NUMA node for the physical memory.
Openfilemapping	Opens a named file mapping object.
Unmapviewoffile	Unmaps A mapped view of a file from the calling process's address space.

Awe Functions

The following are the awe functions.

Function	Description
Allocateuserphysicalpages	Allocates physical memory pages to be mapped and unmapped within any awe region of the process.
Freeuserphysicalpages	Frees physical memory pages previously allocatedAllocateuserphysicalpages.
Mapuserphysicalpages	Maps previusly allocated physical memory pages at the specified address within an awe region.
Mapuserphysicalpagesscatter	Maps previusly allocated physical memory pages at the specified address within an awe region.

Heap Functions

The following are the heap functions.

Function	Description
Getprocessheap	Obtains a handle to the heap of the calling process. Obtain a heap of the current process and return a heap handle.
Getprocessheaps	Obtains handles to all of the heaps that are valid for the calling process. Get all the heap in the process, including the number of heap and the handle of each heap.
Heapalloc	Allocates a block of memory from a heap. allocate memory blocks from the specified heap.
Heapcompact	Attempts to compact a specified heap.
Heapcreate	Creates a heap object. Creates a heap for the process and returns a heap handle.
Heapdestroy	Destroys the specified heap object. Destroy the memory allocated by heapalloc and heaprealloc
Heapfree	Frees a memory block allocated from a heap. release memory allocated by heapcreate
Heaplock	Attempts to acquire the lock associated with a specified heap. Set the memory block allocated by globalalloc and globrealloc as fixed
Heapqueryinformation	Retrieves information about the specified heap.
Heaprealloc	Reallocates a block of memory from a heap. re-allocate the memory and change the size of the allocated heap memory block.
Heapsetinformation	Sets heap information for the specified heap.
Heapsize	Retrieves the size of a memory block allocated from a heap. Gets the size of the specified heap and returns the heap size in bytes.
Heapunlock	Releases ownership of the lock associated with a specified heap.
Heapvalidate	Attempts to validate a specified heap.
Heapwalk	Enumerates the memory blocks in a specified heap.

Virtual Memory Functions

The following are the virtual memory functions.

Function	Description
Virtualalloc	Reserves or commits a region of pages in the virtual address space of the calling process. "retain" or "Submit" Memory Page, change "idle" Memory Page to "Reserved" or "submitted ", change the "retained" page to "submitted ".
Virtualallocex	Reserves or commits a region of pages in the virtual address space of the specified process. Similar to the virtualalloc function, you can allocate memory for other processes.
Virtualallocexnuma	Reserves or commits a region of memory within the virtual address space of the specified process, and specifies the NUMA node for the physical memory.
Virtualfree	Releases or decommits a region of pages within the virtual address space of the calling process. change the memory status from "submitted" to "Reserved", or change "Reserved" to "idle", or at the same time.
Virtualfreeex	Releases or decommits a region of memory within the virtual address space of a specified process. Release the memory allocated by virtualallocex. The function and usage are similar to virtualfree.
Virtuallock	Locks the specified region of the process's virtual address space into physical memory.
Virtualprotect	Changes the access protection on a region of committed pages in the virtual address space of the calling process. Change the protection attribute of the specified Virtual Memory Page.
Virtualprotectex	Changes the access protection on a region of committed pages in the virtual address space of the calling process.
Virtualquery	Provides information about a range of pages in the virtual address space of the calling process.
Virtualqueryex	Provides information about a range of pages in the virtual address space of the calling process.
Virtualunlock	Unlocks a specified range of pages in the virtual address space of a process.

Global and local functions

The following are the global and local functions. these functions are slower than other memory management functions and do not provide as your features. therefore, new applications shocould use the heap functions. however, the global functions are still used with DDE and the clipboard functions.

Function	Description
Globalalloc	Allocates the specified number of bytes from the heap.
Globaldiscard	Discards the specified global memory block.
Globalflags	Returns information about the specified global memory object.
Globalfree	Frees the specified global memory object.
Globalhandle	Retrieves the handle associated with the specified pointer to a global memory block.
Globallock	Locks a global memory object and returns a pointer to the first byte of the object's memory block.
Globalrealloc	Changes the size or attributes of a specified global memory object.
Globalsize	Retrieves the current size of the specified global memory object.
Globalunlock	Decrements the lock count associated with a memory object.
Localalloc	Allocates the specified number of bytes from the heap.
Localdiscard	Discards the specified local memory object.
Localflags	Returns information about the specified local memory object.
Localfree	Frees the specified local memory object.
Localhandle	Retrieves the handle associated with the specified pointer to a local memory object.
Locallock	Locks a local memory object and returns a pointer to the first byte of the object's memory block.
Localrealloc	Changes the size or the attributes of a specified local memory object.
Localsize	Returns the current size of the specified local memory object.
Localunlock	Decrements the lock count associated with a memory object.

Obsolete Functions

The following functions are provided only for compatibility with 16-bit versions of Windows:

·IsbadcodeptrDetermines whether the calling process has read permission on the memory of the specified address.

·IsbadreadptrDetermines whether the calling process has read permission on the memory of the specified address segment

·IsbadstringptrDetermines whether the calling process has the read permission on the specified string pointer.

·IsbadwriteptrDetermines whether the calling process has write permission on the memory of the specified address segment

 

Build Date: 8/15/2007

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1. From msdn2008 local