An application sets a thread-specific hot key by using the RegisterHotKey function. The hot key remains valid until the application that called WM_SETHOTKEY exits.Ī thread-specific hot key generates a WM_HOTKEY message that is posted to the beginning of a particular thread so that it is removed by the next iteration of the message loop. This message activates the window that receives it. Whenever the user presses a global hot key, the window specified in WM_SETHOTKEY receives a WM_SYSCOMMAND message that specifies the SC_HOTKEY value. An application sets a global hot key by using the WM_SETHOTKEY message. A global hot key is associated with a particular window it allows the user to activate the window from any part of the system. The application can use the information provided by a hot key control to set up a global hot key or a thread-specific hot key. The information retrieved from the hot key control includes a flag indicating the modifier key and the virtual key code of the accompanying key. A key combination can consist of a modifier key (such as CTRL, ALT, or SHIFT) and an accompanying key (such as a character key, an arrow key, a function key, and so on).Īfter the user has chosen a key combination, the application retrieves the key combination from the hot key control and uses it to set up a hot key in the system. When the user enters a key combination to be used as a hot key, the names of the keys appear in the hot key control. The following screen shot shows how a hot key control appears in a dialog box after the user presses the Alt key. The hot key control displays the user's choices and ensures that the user selects a valid key combination.
For example, a user can create a hot key that activates a given window and brings it to the top of the z-order. A hot key is a key combination that the user can press to perform an action quickly.
A hot key control is a window that enables the user to enter a combination of keystrokes to be used as a hot key.
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