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# PHEAP_TRACK_ALLOC_ROUTINE callback

> PHEAP_TRACK_ALLOC_ROUTINE callback

Represents a tracking callback function for heap allocation.

## Syntax

```cpp theme={null}
void PHEAP_TRACK_ALLOC_ROUTINE(  
         HANDLE Heap,  
         DWORD Flags,  
         SIZE_T Size,  
         PVOID Addr  
)  
```

### Parameters

*Heap*   \
Type: HANDLE

The handle to the heap from which the memory block was allocated.

*Flags*   \
Type: DWORD

The heap allocation flags passed to [HeapAlloc](https://learn.microsoft.com/windows/desktop/api/heapapi/nf-heapapi-heapalloc).

*Size*   \
Type: SIZE\_T

The number of bytes allocated for the memory block.

*Addr*   \
Type: PVOID

The address of the allocated memory block.

### Return value

Type: void

None.

## Remarks

This callback function can be implemented to track when a memory block is allocated from a Win32 heap. Once implemented, you must register the implemented callback function by calling [XMemSetWin32HeapTrackingHooks](https://docs.xbox.com/reference/system/xmem/functions/xmemsetwin32heaptrackinghooks.md). The callback function is then invoked after `HeapAlloc` is called to allocate a block of memory from a Win32 heap. For more information about implementing this callback function, see the [Remarks](https://docs.xbox.com/reference/system/xmem/functions/xmemsetwin32heaptrackinghooks.md#remarksSection) section of `XMemSetWin32HeapTrackingHooks`.

## Requirements

**Header:** xmem.h

**Library:** xmem.lib

**Supported platforms:** XBOX One family consoles and XBOX Series consoles

## See also

[Diagnostics and memory tracking](https://docs.xbox.com/build/console-features/memory/system-memory-diagnostics.md)\
[XMemCreateWin32Heap](https://docs.xbox.com/reference/system/xmem/functions/xmemcreatewin32heap.md)\
[PHEAP\_TRACK\_FREE\_ROUTINE](https://docs.xbox.com/reference/system/xmem/functions/pheap_track_free_routine.md)\
[PHEAP\_TRACK\_REALLOC\_ROUTINE](https://docs.xbox.com/reference/system/xmem/functions/pheap_track_realloc_routine.md)\
[XMem](https://docs.xbox.com/reference/system/xmem/xmem_members.md)


## Related topics

- [XMemSetWin32HeapTrackingHooks](https://docs.xbox.com/reference/system/xmem/functions/xmemsetwin32heaptrackinghooks.md)
- [PHEAP_TRACK_FREE_ROUTINE callback](https://docs.xbox.com/reference/system/xmem/functions/pheap_track_free_routine.md)
- [PHEAP_TRACK_REALLOC_ROUTINE callback](https://docs.xbox.com/reference/system/xmem/functions/pheap_track_realloc_routine.md)
- [XMEMALLOC_ROUTINE callback](https://docs.xbox.com/reference/system/xmem/functions/xmemalloc_routine.md)
- [XMEMFREE_ROUTINE callback](https://docs.xbox.com/reference/system/xmem/functions/xmemfree_routine.md)