Default Hot-Key Message Processing
This section describes the window messages handled by the window procedure for the predefined HOTKEY_CLASS window class used with hot-key controls.
| Message | Processing performed |
| WM_CHAR | Retrieves the virtual-key code. |
| WM_CREATE | Initializes the hot-key control, sets no hot-key rules, and uses the system font. |
| WM_ERASEBKGND | Hides the caret, calls the DefWindowProc function, and shows the caret again. |
| WM_GETDLGCODE | Returns a combination of the DLGC_WANTCHARS and DLGC_WANTARROWS values. |
| WM_GETFONT | Retrieves the font. |
| WM_KEYDOWN | Calls the DefWindowProc function if the key is ENTER, TAB, SPACE BAR, DEL, ESC, or BACKSPACE. If the key is SHIFT, CTRL, or ALT, it checks whether the combination is valid and, if it is, sets the hot key using the combination. Other keys are set as hot keys without their validity being checked first. |
| WM_KEYUP | Retrieves the virtual-key code. |
| WM_KILLFOCUS | Destroys the caret. |
| WM_LBUTTONDOWN | Sets the focus to the window. |
| WM_NCCREATE | Sets the WS_EX_CLIENTEDGE window style. |
| WM_PAINT | Paints the hot-key control. |
| WM_SETFOCUS | Creates and shows the caret. |
| WM_SETFONT | Sets the font. |
| WM_SYSCHAR | Retrieves the virtual-key code. |
| WM_SYSKEYDOWN | Calls the DefWindowProc function if the key is ENTER, TAB, SPACE BAR, DEL, ESC, or BACKSPACE. If the key is SHIFT, CTRL, or ALT, it checks whether the combination is valid and, if it is, sets the hot key using the combination. Other keys are set as hot keys without their validity being checked first. |
| WM_SYSKEYUP | Retrieves the virtual-key code. |