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VFW_E_DVD_NO_BUTTON
Meaning
Windows documents VFW_E_DVD_NO_BUTTON as “The specified button is invalid or is not present at the current time, or there is no button present at the specified location”. Here, the application selects or activates a menu button that is absent, invalid, or not available at the specified screen position.
Conditions that can produce it
- Cause 1: the menu has no buttons.
- Cause 2: the numeric button index is outside the current menu.
- Cause 3: coordinates refer to a stale layout after a menu change.
Relevant contract
Code-specific boundary: VFW_E_DVD_NO_BUTTON narrows the investigation to the current menu page and selected button number; the requested button is not present in that authored menu. Preserve the DVD domain, title/menu location and graph topology from the same attempt so a later navigation error is not mistaken for the original condition.
Start with the DVD Navigator, graph builder, decoder inventory and renderer topology.
Evidence worth preserving
- Evidence 1: current domain, menu and button count.
- Evidence 2: selected button number or activation coordinates.
- Evidence 3: EC_DVD_BUTTON_CHANGE and menu-transition events.
Correction strategy
- Action 1: query current button availability before enabling input.
- Action 2: discard cached coordinates after every menu or aspect change.
- Action 3: handle buttonless menus without treating them as playback failure.
Example incident
A mouse click arrives just after the DVD changes menus and uses the old highlight rectangles; refreshing them on EC_DVD_BUTTON_CHANGE avoids it.
Retry and recovery
Retry rule: Retry after a menu with valid buttons is active or after refreshing the button map.
How it differs from nearby results
VFW_E_DVD_MENU_DOES_NOT_EXIST means the requested menu itself is absent; it means the active context lacks the requested button.
Official Microsoft references
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