What does Windows error code 1437 (ERROR_NO_SYSTEM_MENU) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: the requested system-menu operation targets a window that has no system menu.

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ERROR_CHILD_WINDOW_MENU	ERROR_INVALID_MSGBOX_STYLE

ERROR_NO_SYSTEM_MENU

The window does not have a system menu

The system menu is the window menu associated with top-level window operations such as move, size, minimize, maximize, and close. Its presence depends on the window's style and type; it is not a universal menu attached to every HWND.

A helper that calls system-menu APIs for child windows, tool windows with different chrome, or top-level windows created without the relevant style can encounter this condition. Adding menu items cannot work until the target actually has a system menu.

What to check

Inspect the target window type and style bits, including WS_SYSMENU.
Call system-menu APIs only for windows whose nonclient design includes that menu.
Do not confuse the application menu returned by GetMenu with the system menu.
When styles change dynamically, reacquire the system-menu handle instead of caching it indefinitely.

A missing command in an existing menu is a different lookup problem; this code says the target window has no system menu to operate on.

References

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