What does Windows error code 1457 (ERROR_INVALID_KEYBOARD_HANDLE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A keyboard-layout operation received an invalid or stale HKL value.

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ERROR_MENU_ITEM_NOT_FOUND	ERROR_HOOK_TYPE_NOT_ALLOWED

ERROR_INVALID_KEYBOARD_HANDLE

The supplied keyboard layout handle is not valid.

ERROR_INVALID_KEYBOARD_HANDLE is Win32 error 1457 (0x5B1). An HKL represents a loaded input locale or keyboard layout in a Windows input context. It is not a persistent language identifier, a locale name, or a value that should be saved indefinitely and reused after layouts are unloaded or sessions change.

Typical causes

using an HKL after UnloadKeyboardLayout
storing the handle across logon sessions, desktop changes, or process restarts
passing a language ID or registry string after an unsafe cast
assuming a layout loaded for one context is available to another thread
reacting to an input-language change with a stale cached handle

Evidence to capture

Log the numeric HKL, target thread, current keyboard layout from GetKeyboardLayout, list returned by GetKeyboardLayoutList, layout name, session ID, desktop, and the API that rejected it. Record when the handle was loaded and whether any component unloaded it.

Diagnostic sequence

Enumerate layouts that are currently loaded and compare the candidate handle with that live list. If the application needs a particular locale, obtain or load it through the documented keyboard-layout APIs instead of reconstructing an HKL from a language code. Verify that the operation executes in the intended UI thread and session.

Review handling of WM_INPUTLANGCHANGE and user-driven layout removal. The active layout can change while a queued command is pending. Treat keyboard layout as session state and update cached presentation data when Windows notifies the application.

Recovery

Use the current layout, reload the requested layout by name when policy permits it, or ask the user to enable the required input language. Avoid silently substituting a layout for security-sensitive input, because key interpretation may change.

Related values

ERROR_INVALID_HANDLE is generic. Error 1457 specifically identifies the keyboard-layout handle and directs investigation toward input-language lifetime and session context.

Example

An editor caches an HKL for a transliteration feature. The user removes that keyboard layout in Settings, but a later shortcut calls ActivateKeyboardLayout with the cached value and receives 1457. Re-resolving the layout from the current loaded list avoids the stale handle.

References

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