A hook list contains the addresses of the functions that the system calls while processing a hook. An application can take advantage of a particular type of hook by defining a hook function and using WinSetHook to enter the address of the function in the corresponding hook list. To specify the hook type in WinSetHook, the application uses one of the following constants:
旼컴컴컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿎onstant Name 쿏escription � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_CHECKMSGFILTER 쿗ets applications apply very specific � � 쿺essage filtering. See HK_CHECKMSGFILTER� � �- Check Message Filter Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_CODEPAGECHANGED 쿗ets applications determine when the � � 쿬ode page changes. See HK_CODEPAGECHANGE� � �- Code Page Changed Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_DESTROYWINDOW 쿎alled whenever a window is destroyed. � � 쿞ee HK_DESTROYWINDOW - Destroy Window � � �Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_FINDWORD 쿗ets applications control where � � 쿥inDrawText places line breaks. See � � �HK_FINDWORD - Find Word Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_FLUSHBUF 쿗ets applications save data before the � � 퀂ystem reboots. See HK_FLUSHBUF - Flush � � �Buffer Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_HELP 쿘onitors the WM_HELP message. See � � �HK_HELP - Help Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_INPUT 쿘onitors messages in the specified � � 쿺essage queue. See HK_INPUT - Input Hook� � �. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_JOURNALPLAYBACK 쿗ets applications insert messages into � � 퀃he system message queue. See � � �HK_JOURNALPLAYBACK - Journal Playback � � �Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_JOURNALRECORD 쿗ets applications record mouse and � � 쿸eyboard input messages. See � � �HK_JOURNALRECORD - Journal Record Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_LOADER 쿗ets the library and procedure loading � � 쿪nd deleting calls be intercepted. See � � �HK_LOADER - Loader Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_LOCKUP 쿎alled when the system locks itself up. � � 쿞ee HK_LOCKUP - Lockup Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_MSGCONTROL 쿘onitors the flow of messages to be � � 쿶ntercepted. See HK_MSGCONTROL - Message� � �Control Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_MSGFILTER 쿘onitors input events during system � � 쿺odal loops. See HK_MSGFILTER - Message � � �Filter Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_MSGINPUT 쿗ets applications simulate user input, � � 쿪nd only mouse and keyboard messages � � 퀂hould be passed in. All other messages � � 퀇ill be discarded. Mouse and keyboard � � 쿺essages injected into this hook will � � 쿴ave the same effect as if they were � � 쿲enerated by the mouse or keyboard � � 쿭evice driver. The messages are routed � � 쿶n the same manner as normal user input.� � 쿞ee HK_MSGINPUT - Message Input Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_PLIST_ENTRY 쿎alled every time a program-list call or� � 쿶nitialization file call is invoked by � � 쿪n application. It is called before the � � 쿬all is run. See HK_PLIST_ENTRY - � � �Program List Call Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_PLIST_EXIT 쿎alled every time a program-list call or� � 쿶nitialization file call is invoked by � � 쿪n application. It is called before the� � 쿬all is run. See HK_PLIST_EXIT - Program� � �List Exit Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_REGISTERUSERMSG 쿎alled whenever a user message or data � � 퀃ype is registered. See � � �HK_REGISTERUSERMSG - Register User � � �Message Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_SENDMSG 쿘onitors messages sent by using � � 쿥inSendMsg. See HK_SENDMSG - Send � � �Message Hook. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿓K_WINDOWDC 쿎alled when a device context is � � 쿪llocated or freed. See HK_WINDOWDC - � � �Device Context Hook. � 읕컴컴컴컴컴컴컴컴컴컨컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�
While running a function that contains a hook, the system checks for any function addresses in the hook list that correspond to the type of hook. If an address is found, the system tries to locate and run the function.