在msdn中找到了如下结果： Win32 HooksFilter functions in DLLsSystemwide filter functions must reside in a DLL. In Win16 it was possible (although not recommended) to install a systemwide hook to a filter function in an application. This does not work in Win32. Do not install systemwide filter functions that are not in DLLs, even if it does seem to work on a particular system. The journal hooks, WH_JOURNALRECORD and WH_JOURNALPLAYBACK, are exceptions to this rule. Because of the way Windows calls these hooks, their filter functions do not have to be in a DLL.
Win32 HooksFilter functions in DLLsSystemwide filter functions must reside in a DLL. In Win16 it was possible (although not recommended) to install a systemwide hook to a filter function in an application. This does not work in Win32. Do not install systemwide filter functions that are not in DLLs, even if it does seem to work on a particular system. The journal hooks, WH_JOURNALRECORD and WH_JOURNALPLAYBACK, are exceptions to this rule. Because of the way Windows calls these hooks, their filter functions do not have to be in a DLL.
oldHook := SetWindowsHookEx(WH_JOURNALRECORD, @YourHookProc, hInstance, 0);
......在YourHookProc里随你便啦。