Windows error 1405 (ERROR_INVALID_DWP

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: the HDWP chain used for deferred window positioning is invalid.

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ERROR_INVALID_HOOK_HANDLE	ERROR_TLW_WITH_WSCHILD

ERROR_INVALID_DWP_HANDLE

The multiple-window-position handle is invalid

BeginDeferWindowPos creates an HDWP state object that is updated by each DeferWindowPos call and consumed by EndDeferWindowPos. It is a short-lived operation chain, not a reusable layout handle.

The important contract detail is that DeferWindowPos returns the updated handle, and that returned value can differ from the value passed in. Continuing with the old HDWP, reusing a handle after EndDeferWindowPos, or continuing after a failed defer call can invalidate the chain.

What to check

Assign the result of every DeferWindowPos call back to the tracked HDWP.
Stop the sequence immediately if a defer call returns NULL and capture GetLastError.
Call EndDeferWindowPos once for the final live handle.
Do not retain the handle for a later layout pass.

If the chain is valid but its windows have different parents, the more specific condition is ERROR_HWNDS_HAVE_DIFF_PARENT.

References

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