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RegisterHotKey

TheRegisterHotKeyfunctiondefinesasystem-widehotkey.

BOOLRegisterHotKey(

HWNDhWnd,//windowtoreceivehot-keynotification

intid,//identifierofhotkey

UINTfsModifiers,//key-modifierflags

UINTvk//virtual-keycode

);

Parameters

hWnd

HandletothewindowthatwillreceiveWM_HOTKEYmessagesgeneratedbythehotkey.IfthisparameterisNULL,WM_HOTKEYmessagesarepostedtothemessagequeueofthecallingthreadandmustbeprocessedinthemessageloop.

id

Specifiestheidentifierofthehotkey.Nootherhotkeyinthecallingthreadshouldhavethesameidentifier.Anapplicationmustspecifyavalueintherange0x0000through0xBFFF.Ashareddynamic-linklibrary(DLL)mustspecifyavalueintherange0xC000through0xFFFF(therangereturnedbytheGlobalAddAtomfunction).Toavoidconflictswithhot-keyidentifiersdefinedbyothersharedDLLs,aDLLshouldusetheGlobalAddAtomfunctiontoobtainthehot-keyidentifier.

fsModifiers

SpecifieskeysthatmustbepressedincombinationwiththekeyspecifiedbythenVirtKeyparameterinordertogeneratetheWM_HOTKEYmessage.ThefsModifiersparametercanbeacombinationofthefollowingvalues.ValueMeaning

MOD_ALTEitheraltkeymustbehelddown.

MOD_CONTROLEitherctrlkeymustbehelddown.

MOD_SHIFTEithershiftkeymustbehelddown.

MOD_WINEitherWINDOWSkeywashelddown.ThesekeysarelabeledwiththeMicrosoftWindowslogo.

vk

Specifiesthevirtual-keycodeofthehotkey.

ReturnValues

Ifthefunctionsucceeds,thereturnvalueisnonzero.

Ifthefunctionfails,thereturnvalueiszero.Togetextendederrorinformation,callGetLastError.

Remarks

Whenakeyispressed,thesystemlooksforamatchagainstallhotkeys.Uponfindingamatch,thesystempoststheWM_HOTKEYmessagetothemessagequeueofthethreadthatregisteredthehotkey.Thismessageispostedtothebeginningofthequeuesoitisremovedbythenextiterationofthemessageloop.

Thisfunctioncannotassociateahotkeywithawindowcreatedbyanotherthread.

RegisterHotKeyfailsifthekeystrokesspecifiedforthehotkeyhavealreadybeenregisteredbyanotherhotkey.

IfthewindowidentifiedbythehWndparameteralreadyregisteredahotkeywiththesameidentifierasthatspecifiedbytheidparameter,thenewvaluesforthefsModifiersandvkparametersreplacethepreviouslyspecifiedvaluesfortheseparameters.

WindowsCE:WindowsCEversions2.0andlatersupportanadditionalflag,calledMOD_KEYUP,forthefsModifiersparameter.IfyousettheMOD_KEYUPflag,thewindowwillbesentaWM_HOTKEYmessageonakeyupeventaswellasonakeydownevent.

RegisterHotKeycanbeusedtoregisterhotkeysacrossthreads.

QuickInfo

WindowsNT:Requiresversion3.1orlater.

Windows:RequiresWindows95orlater.

WindowsCE:Unsupported.

Header:Declaredinwinuser.h.

ImportLibrary:Useuser32.lib.

SeeAlso

KeyboardInputOverview,KeyboardInputFunctions,GlobalAddAtom,UnregisterHotKey,WM_HOTKEY

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