The CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain. A hook procedure can call this function either before or after processing the hook information.
Syntax
LRESULT CallNextHookEx( HHOOK hhk, int nCode, WPARAM wParam, LPARAM lParam );
Parameters
hhk [in] Windows 95/98/ME: Handle to the current hook. An application receives this handle as a result of a previous call to the SetWindowsHookEx function. Windows NT/XP/2003: Ignored.nCode [in] 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 [in] 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 [in] 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.
Windows NT/XP/2003: Ignored.
Return Value
Remarks
Hook procedures are installed in chains for particular hook types. CallNextHookEx calls the next hook in the chain. Calling CallNextHookEx is optional, but it is highly recommended; otherwise, other applications that have installed hooks will not receive hook notifications and may behave incorrectly as a result. You should call CallNextHookEx unless you absolutely need to prevent the notification from being seen by other applications.
Hook procedures are installed in chains for particular hook types. CallNextHookEx calls the next hook in the chain.
Calling CallNextHookEx is optional, but it is highly recommended; otherwise, other applications that have installed hooks will not receive hook notifications and may behave incorrectly as a result. You should call CallNextHookEx unless you absolutely need to prevent the notification from being seen by other applications.
Function Information
Minimum DLL Versionuser32.dllHeaderDeclared in Winuser.h, include Windows.hImport libraryUser32.libMinimum operating systems Windows 95, Windows NT 3.1UnicodeImplemented as Unicode version.
See Also
Hooks Overview, SetWindowsHookEx, UnhookWindowsHookEx
<DllImport("user32.dll", CharSet:=CharSet.Auto, ExactSpelling:=True)> Public Shared Function CallNextHookEx(ByVal hhook As HandleRef, ByVal code As Integer, ByVal wparam As IntPtr, ByVal lparam As IntPtr) As IntPtrEnd Function
[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)] public static extern IntPtr CallNextHookEx(HandleRef hhook, int code, IntPtr wparam, IntPtr lparam);