What does Windows error code 1429 (ERROR_GLOBAL_ONLY_HOOK) mean?

ERROR_GLOBAL_ONLY_HOOK

The hook type must be installed globally

Some USER32 hook categories have scope rules that differ from ordinary thread hooks. A global hook uses a zero thread ID and is associated with threads in the caller's desktop according to SetWindowsHookEx semantics.

The error means a recognized hook type was requested with thread-local scope even though that hook category is global-only. Changing the callback body cannot fix the scope mismatch; the installation parameters and deployment model must change.

What to check

• Verify the selected WH_* type and its documented scope.
• Use dwThreadId == 0 only when a global hook is actually required.
• Supply a DLL-based hook procedure and module handle when global injection rules require them.
• Consider a narrower supported event mechanism if system-wide observation is unnecessary.

This differs from ERROR_INVALID_HOOK_FILTER, where the hook type value itself is invalid, and from ERROR_HOOK_NEEDS_HMOD, where scope is chosen but module identification is missing.

References

• Microsoft: SetWindowsHookEx
• Microsoft: Hooks Overview

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