可以使用钩子函数
首先声明api函数和常量
Public Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hmod As Long, ByVal dwThreadId As Long) As Long
Public Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long
Public Declare Function GetCurrentThreadId Lib "kernel32" () As Long
Public Const WH_KEYBOARD = 2
Public gLngKeyHook As Long
Public Function KeyboardProc(ByVal nCode As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
KeyboardProc = -1
End Function