Win32 Hooks

[slavik262]

I'm running Vista. Anyways, WH_KEYBOARD_LL apparently catches messages when "a new keyboard input event is about to be posted into a thread input queue" and WH_KEYBOARD catches messages "whenever an application calls the GetMessage or PeekMessage function and there is a keyboard message (WM_KEYUP or WM_KEYDOWN) to be processed". For my purposes, I thought WH_KEYBOARD would be fine. And according to the MSDN explanation of SetWindowsHookEx(), WH_KEYBOARD should be able to run globally.

EDIT: Using WH_KEYBOARD_LL, the hook works globally. However I cannot do what I wanted to (which is change the keystroke en-route to programs). WH_KEYBOARD_LL passes a pointer to a struct containing they key data (such as key code, etc.) as it's lParam, but i have found that changing the data in the struct does not affect the output (even If I change the keycode the key remains the same). Can't I change the data in the message using the hook?