123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*
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* Windows hook functions
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*
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* Copyright 1994 Alexandre Julliard
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*/
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static char Copyright[] = "Copyright Alexandre Julliard, 1994";
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/* Warning!
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* HHOOK is not a real handle, but a 32-bit pointer to a HOOKDATA structure.
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* This is for compatibility with Windows 3.0 where HHOOK was a HOOKPROC.
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*/
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#include "hook.h"
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HHOOK systemHooks[LAST_HOOK-FIRST_HOOK+1] = { 0, };
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/* Task-specific hooks should probably be in the task structure */
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HHOOK taskHooks[LAST_HOOK-FIRST_HOOK+1] = { 0, };
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/***********************************************************************
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* SetWindowsHook (USER.121)
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*/
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HHOOK SetWindowsHook( short id, HOOKPROC proc )
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{
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return SetWindowsHookEx( id, proc, 0, 0 );
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}
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/***********************************************************************
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* UnhookWindowsHook (USER.234)
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*/
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BOOL UnhookWindowsHook( short id, HHOOK hhook )
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{
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return UnhookWindowsHookEx( hhook );
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}
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/***********************************************************************
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* DefHookProc (USER.235)
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*/
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DWORD DefHookProc( short code, WORD wParam, DWORD lParam, HHOOK *hhook )
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{
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return CallNextHookEx( *hhook, code, wParam, lParam );
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}
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/***********************************************************************
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* CallMsgFilter (USER.123)
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*/
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BOOL CallMsgFilter( LPMSG msg, short code )
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{
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if (CALL_SYSTEM_HOOK( WH_SYSMSGFILTER, code, 0, (LPARAM)msg )) return TRUE;
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else return CALL_TASK_HOOK( WH_MSGFILTER, code, 0, (LPARAM)msg );
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}
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/***********************************************************************
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* SetWindowsHookEx (USER.291)
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*/
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HHOOK SetWindowsHookEx( short id, HOOKPROC proc, HINSTANCE hinst, HTASK htask )
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{
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HOOKDATA *data;
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HANDLE handle;
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HHOOK *prevHook;
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if ((id < FIRST_HOOK) || (id > LAST_HOOK)) return 0;
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if (htask) /* Task-specific hook */
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{
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if ((id == WH_JOURNALRECORD) || (id == WH_JOURNALPLAYBACK) ||
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(id == WH_SYSMSGFILTER)) return 0;
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prevHook = &TASK_HOOK( id );
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}
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else /* System-wide hook */
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{
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prevHook = &SYSTEM_HOOK( id );
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}
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handle = (HANDLE) USER_HEAP_ALLOC( GMEM_MOVEABLE, sizeof(*data) );
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if (!handle) return 0;
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data = (HOOKDATA *) USER_HEAP_ADDR( handle );
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data->next = *prevHook;
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data->proc = proc;
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data->id = id;
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data->htask = htask;
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*prevHook = (HHOOK)data;
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return (HHOOK)data;
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}
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/***********************************************************************
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* UnhookWindowHookEx (USER.292)
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*/
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BOOL UnhookWindowsHookEx( HHOOK hhook )
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{
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HOOKDATA *data = (HOOKDATA *)hhook;
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HHOOK *prevHook;
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if (!data) return FALSE;
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prevHook = data->htask ? &TASK_HOOK(data->id) : &SYSTEM_HOOK(data->id);
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while (*prevHook && (*prevHook != hhook))
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prevHook = &((HOOKDATA *)*prevHook)->next;
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if (!*prevHook) return FALSE;
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*prevHook = data->next;
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USER_HEAP_FREE( hhook & 0xffff );
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return TRUE;
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}
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/***********************************************************************
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* CallNextHookEx (USER.293)
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*/
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DWORD CallNextHookEx( HHOOK hhook, short code, WPARAM wParam, LPARAM lParam )
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{
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HOOKDATA *data = (HOOKDATA *)hhook;
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if (!data->next) return 0;
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else return INTERNAL_CALL_HOOK( data->next, code, wParam, lParam );
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}
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