Retrieving and Setting a Hot Key

After the user has chosen a hot key, an application should retrieve the hot key from the hot-key control by using the HKM_GETHOTKEY message. This message retrieves a 16-bit value that contains the virtual-key code and modifier keys describing the hot key.

The following function retrieves a key combination from a hot-key control and then uses the WM_SETHOTKEY message to set a global hot key. Note that you cannot set a global hot key for a window that has the WS_CHILD window style.

// ProcessHotkey - retrieves the hot key from the hot-key control and

// sets it as the hot key for the application's main window.

// Returns TRUE if successful or FALSE otherwise.

// hwndHot - handle of the hot-key control

// hwndMain - handle of the main window

BOOL WINAPI ProcessHotkey(HWND hwndHot, HWND hwndMain)

{

WORD wHotkey;

UINT iSetResult;

// Retrieve the hot key (virtual-key code and modifiers).

wHotkey = SendMessage(hwndHot, HKM_GETHOTKEY, 0, 0);

// Use the result as wParam for WM_SETHOTKEY.

iSetResult = SendMessage(hwndMain, WM_SETHOTKEY, wHotkey, 0);

switch (iSetResult) {

case 2: // WM_SETHOTKEY succeeded

MessageBox(NULL, "Hot key previously assigned",

"Okay", MB_OK);

return TRUE;

case 1: // WM_SETHOTKEY succeeded

return TRUE;

case 0:

MessageBox(NULL, "Invalid window for hot key",

"Error", MB_OK);

return FALSE;

case -1:

MessageBox(NULL, "Invalid hot key",

"Error", MB_OK);

return FALSE;

default:

MessageBox(NULL, "Unknown error", "Error", MB_OK);

return FALSE;

}

}

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