Smart scrolling hook dll for win2k - win7. Compile: cl XScrollHook.c /MD /LD /link User32.lib

XScrollHook.c

#include <Windows.h>

BOOL WINAPI _DllMainCRTStartup(HINSTANCE hinstDLL,DWORD fdwReason,LPVOID lpReserved)
{
    return 1;
}

LRESULT CALLBACK MouseXScrollHook(int code, WPARAM wParam, LPARAM lParam ) {
    POINT cursorPosition = {0};
    HWND desiredWindow = 0;
    DWORD processId = 0;
    if ( code >= 0 ) {
        if ( lParam ) {
            PMSG message = (PMSG)lParam;
            if ( message->message == WM_MOUSEWHEEL ) {
                GetCursorPos(&cursorPosition);
                desiredWindow = WindowFromPoint(cursorPosition);
                if ( desiredWindow && message->hwnd != desiredWindow ) {
                    SendMessageA(desiredWindow, WM_MOUSEWHEEL, message->wParam, message->lParam);
                    message->message = WM_NULL;
                    message->wParam = 0;
                    message->lParam = 0;
                }
            }
        }
    }
    return CallNextHookEx(NULL, code, wParam, lParam);
}

__declspec(dllexport) HHOOK __cdecl BindXScrollHook(HINSTANCE myInstance){
    return SetWindowsHookExA(WH_GETMESSAGE, MouseXScrollHook, myInstance, 0);
}