Windows error 1456 (ERROR_MENU_ITEM_NOT

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A menu handle was valid, but the requested command, position, or submenu item could not be found.

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ERROR_COMMITMENT_LIMIT	ERROR_INVALID_KEYBOARD_HANDLE

ERROR_MENU_ITEM_NOT_FOUND

The specified item is absent from the menu.

ERROR_MENU_ITEM_NOT_FOUND is Win32 error 1456 (0x5B0). Unlike an invalid HMENU, this result means the menu object exists but lookup did not find the requested entry. The most important diagnostic question is whether the API interprets the supplied number as a command identifier or as a zero-based position.

Common lookup mistakes

omitting or adding MF_BYPOSITION for the wrong kind of value
using a resource command ID against a dynamically rebuilt menu
searching the parent menu for an item located in a submenu
removing or replacing an item before a later update handler runs
assuming localized text identifies the same item across menu versions

Evidence to log

Capture the menu handle, target value, lookup mode, item count, owner window, menu generation, and a diagnostic enumeration of command IDs and positions. Record the message or feature that initiated lookup. For dynamic menus, include the data source and the time the menu was populated.

Diagnostic sequence

Confirm that the HMENU is valid, then enumerate its direct items with GetMenuItemCount and GetMenuItemInfo. Determine whether the failing API expects a command ID or position. If the desired entry is nested, obtain the submenu handle before repeating the lookup.

Review mutations during WM_INITMENUPOPUP, command update handlers, and plug-in refreshes. An item can exist when a handle is cached but disappear before the operation. Use stable application identifiers and resolve the menu item at the point of use rather than caching positions.

Recovery

Rebuild the menu from current state, use the correct lookup mode, or treat an optional missing item as a no-op. Do not insert a replacement blindly at the requested numeric position, because positions shift when other components add or remove entries.

Difference from handle errors

ERROR_INVALID_MENU_HANDLE means the menu object itself is invalid. Error 1456 means the menu is valid but the requested item is not present under the chosen identification method.

Example

A context menu inserts plug-in commands ahead of a built-in item. Code later uses the old position with MF_BYPOSITION, and lookup returns 1456. Searching by the built-in command ID instead of a mutable position makes the update independent of plug-in ordering.

References

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