The CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain. This function supersedes the DefHookProc function.
LRESULT CallNextHookEx(
| HHOOK hhk, | // handle to current hook |
| int nCode, | // hook code passed to hook procedure |
| WPARAM wParam, | // value passed to hook procedure |
| LPARAM lParam | // value passed to hook procedure |
| ); |
Parameters
hhk
Identifies the current hook. An application receives this handle as a result of a previous call to the SetWindowsHookEx function.
nCode
Specifies the hook code passed to the current hook procedure. The next hook procedure uses this code to determine how to process the hook information.
wParam
Specifies the wParam value passed to the current hook procedure. The meaning of this parameter depends on the type of hook associated with the current hook chain.
lParam
Specifies the lParam value passed to the current hook procedure. The meaning of this parameter depends on the type of hook associated with the current hook chain.
Return Values
If the function succeeds, the return value is the value returned by the next hook procedure in the chain. The current hook procedure must also return this value. The meaning of the return value depends on the hook type. For more information, see the descriptions of the individual hook procedures.
Remarks
Hook procedures are installed in chains for particular hook types. CallNextHookEx calls the next hook in the chain.
Calling CallNextHookEx is optional. A hook procedure can call this function either before or after processing the hook information. If a hook procedure does not call CallNextHookEx, Windows does not call the hook procedures installed before the current hook procedure was installed.
See Also
SetWindowsHook, SetWindowsHookEx, UnhookWindowsHook, UnhookWindowsHookEx