About Hot-Key Control Messages

After creating a hot-key control, an application interacts with it by using three messages: HKM_SETRULES, HKM_SETHOTKEY, and HKM_GETHOTKEY.

An application can send the HKM_SETRULES message to specify a set of CTRL, ALT, and SHIFT key combinations that are considered invalid hot keys. If the application specifies an invalid key combination, it should also specify a default modifier combination to use when the user selects the invalid combination. When the user enters the invalid combination, the system performs a logical-OR operation on the invalid combination entered by the user and the default combination. The result is considered a valid combination; it is converted to a string and displayed in the control.

The HKM_SETHOTKEY message allows an application to set the hot key combination for a hot-key control. This message is also typically used when the hot-key control is created.

Applications use the HKM_GETHOTKEY message to retrieve the virtual-key code and modifier flags of the hot key chosen by the user of a hot-key control.

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