暗黑2 野蛮人 物免:关于SetWindowsHookEx函数

Module1.bas代码如下

Const WM_MOUSELAST = &H209
Const WM_MOUSEFIRST = &H200
Public Const WM_KEYLAST = &H108
Public Const WM_KEYFIRST = &H100

Public Const WH_CALLWNDPROC = 4
Public Const WH_CALLWNDPROCRET = 12
Public Const WH_CBT = 5
Public Const WH_DEBUG = 9
Public Const WH_FOREGROUNDIDLE = 11
Public Const WH_GETMESSAGE = 3
Public Const WH_HARDWARE = 8
Public Const WH_JOURNALPLAYBACK = 1
Public Const WH_JOURNALRECORD = 0
Public Const WH_KEYBOARD = 2
Public Const WH_MOUSE = 7
Public Const WH_MSGFILTER = (-1)
Public Const WH_SHELL = 10
Public Const WH_SYSMSGFILTER = 6

Public Const WM_IME_STARTCOMPOSITION = &H10D
Public Const WM_IME_ENDCOMPOSITION = &H10E
Public Const WM_IME_COMPOSITION = &H10F
Public Const WM_IME_KEYLAST = &H10F

Type EVENTMSG
message As Long
paramL As Long
paramH As Long
time As Long
hwnd As Long
End Type

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
Declare Function UnhookWindowsHookEx Lib "user32" _
(ByVal hHook As Long) As Long
Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, _
ByVal nCode As Long, ByVal wParam As Long, lParam As Any) As Long
Declare Sub CopyMemory Lib "KERNEL32" Alias "RtlMoveMemory" _
(lpvDest As Any, ByVal lpvSource As Long, ByVal cbCopy As Long)
Public hNxtHook As Long ' handle of Hook Procedure
Public msg As EVENTMSG

Sub EnableHook()
hNxtHook = SetWindowsHookEx(WH_GETMESSAGE, AddressOf HookProc, App.hInstance, 0)
End Sub
Sub FreeHook()
Dim ret As Long
ret = UnhookWindowsHookEx(hNxtHook)
End Sub
Function HookProc(ByVal code As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
CopyMemory msg, lParam, LenB(msg)
Debug.Print msg.message, msg.paramH, msg.paramL, msg.time, msg.hwnd

HookProc = CallNextHookEx(hNxtHook, code, wParam, lParam)
End Function

在form1中调用了EnableHook后HookProc 居然一直没有反映?
请问问题出在什么地方??