同志们！！！求救！！！SetWindowsHookEx！！！如何具体用，用最好要例子！！！

[g8341]

同志们！！！求救！！！SetWindowsHookEx！！！如何具体用，用最好要例子！！！
我想用回调函数，来截获IE中的单击信息！可在线程处用，setwindowslong,不行,
可setwindowshookex() 怎么用啊,
说个例子吧或想个思路,
谢谢了朋友们 1!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
在线等待!!!!!

[zyl910]

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
================================================================================
'In a module
Public Const WH_KEYBOARD = 2
Public Const VK_SHIFT = &H10
Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal ncode As Long, ByVal wParam As Long, lParam As Any) As Long
Declare Function GetKeyState Lib "user32" (ByVal nVirtKey As Long) As Integer
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
Public hHook As Long
Public Function KeyboardProc(ByVal idHook As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
'if idHook is less than zero, no further processing is required
If idHook < 0 Then
'call the next hook
KeyboardProc = CallNextHookEx(hHook, idHook, wParam, ByVal lParam)
Else
'check if SHIFT-S is pressed
If (GetKeyState(VK_SHIFT) And &HF0000000) And wParam = Asc("S") Then
'show the result
Form1.Print "Shift-S pressed ..."
End If
'call the next hook
KeyboardProc = CallNextHookEx(hHook, idHook, wParam, ByVal lParam)
End If
End Function

'In a form, called Form1
Private Sub Form_Load()
'KPD-Team 2000
'URL: http://www.allapi.net/
'E-Mail: [e-mail]
'set a keyboard hook
hHook = SetWindowsHookEx(WH_KEYBOARD, AddressOf KeyboardProc, App.hInstance, App.ThreadID)
End Sub
Private Sub Form_Unload(Cancel As Integer)
'remove the windows-hook
UnhookWindowsHookEx hHook
End Sub

[uguess]

'In a module
Public Const WH_KEYBOARD = 2
Public Const VK_SHIFT = &H10
Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal ncode As Long, ByVal wParam As Long, lParam As Any) As Long
Declare Function GetKeyState Lib "user32" (ByVal nVirtKey As Long) As Integer
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
Public hHook As Long
Public Function KeyboardProc(ByVal idHook As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
'if idHook is less than zero, no further processing is required
If idHook < 0 Then
'call the next hook
KeyboardProc = CallNextHookEx(hHook, idHook, wParam, ByVal lParam)
Else
'check if SHIFT-S is pressed
If (GetKeyState(VK_SHIFT) And &HF0000000) And wParam = Asc("S") Then
'show the result
Form1.Print "Shift-S pressed ..."
End If
'call the next hook
KeyboardProc = CallNextHookEx(hHook, idHook, wParam, ByVal lParam)
End If
End Function

'In a form, called Form1
Private Sub Form_Load()
'KPD-Team 2000
'URL: http://www.allapi.net/
'E-Mail: [e-mail]
'set a keyboard hook
hHook = SetWindowsHookEx(WH_KEYBOARD, AddressOf KeyboardProc, App.hInstance, App.ThreadID)
End Sub
Private Sub Form_Unload(Cancel As Integer)
'remove the windows-hook
UnhookWindowsHookEx hHook
End Sub

[uguess]

Hook
一、Hook简介
一、Hook简介

Hook这个东西有时令人又爱又怕，Hook是用来拦截系统某些讯息之用，例如说，我们想
让系统不管在什麽地方只要按个Ctl-B便执行NotePad，或许您会使用Form的KeyPreview
，设定为True，但在其他Process中按Ctl-B呢？那就没有用，这是就得设一个Keyboard
Hook来拦截所有Key in的键；再如：MouseMove的Event只在该Form或Control上有效，如镇
果希??在Form的外面也能得知Mouse Move的讯息，那只好使用Mouse Hook来栏截Mouse
的讯息。再如：您想记录方才使用者的所有键盘动作或Mosue动作，以便录巨集，那就
使用JournalRecordHook，如果想停止所有Mosue键盘的动作，而放(执行)巨集，那就
使用JournalPlayBack Hook；Hook呢，可以是整个系统为范围(Remote Hook)，即其他
Process的动作您也可以拦截，也可以是LocalHook，它的拦截范围只有Process本身。
Remote Hook的Hook Function要在.Dll之中，Local Hook则在.Bas中。
在VB如何设定Hook呢？使用SetWindowsHookEx()

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

idHook代表是何种Hook，有以下几种
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

lpfn代表Hook Function所在的Address，这是一个CallBack Fucnction，当挂上某个
Hook时，我们便得定义一个Function来当作某个讯息产生时，来处理它的Function
，这个Hook Function有一定的叁数格式

Private Function HookFunc(ByVal ncode As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) As Long


nCode 代表是什麽请况之下所产生的Hook，随Hook的不同而有不同组的可能值
wParam lParam 传回值则随Hook的种类和nCode的值之不同而不同。

因这个叁数是一个 Function的Address所以我们固定将Hook Function放在.Bas中，
并以AddressOf HookFunc传入。至於Hook Function的名称我们可以任意给定，不一
定叫 HookFunc

hmod 代表.DLL的hInstance，如果是Local Hook，该值可以是Null(VB中可传0进去)，
而如果是Remote Hook，则可以使用GetModuleHandle(".dll名称")来传入。

dwThreadId 代表执行这个Hook的ThreadId，如果不设定是那个Thread来做，则传0(所以
一般来说，Remote Hook传0进去)，而VB的Local Hook一般可传App.ThreadId进去
值回值 如果SetWindowsHookEx()成功，它会传回一个值，代表目前的Hook的Handle，
这个值要记录下来。

因为A程式可以有一个System Hook(Remote Hook)，如KeyBoard Hook，而B程式也来设一
个Remote的KeyBoard Hook，那麽到底KeyBoard的讯息谁所拦截？答案是，最後的那一个
所拦截，也就是说A先做keyboard Hook，而後B才做，那讯息被B拦截，那A呢？就看B的
Hook Function如何做。如果B想让A的Hook Function也得这个讯息，那B就得呼叫
CallNextHookEx()将这讯息Pass给A，於是产生Hook的一个连线。如果B中不想Pass这讯息
给A，那就不要呼叫CallNextHookEx()。

Declare Function CallNextHookEx Lib "user32" _
(ByVal hHook As Long, _
ByVal ncode As Long, _
ByVal wParam As Long, _
lParam As Any) As Long

hHook值是SetWindowsHookEx()的传回值，nCode, wParam, lParam则是Hook Procedure
中的三个叁数。
最後是将这Hook去除掉，请呼叫UnHookWindowHookEx()
Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long

hHook便是SetWindowsHookEx()的传回值。此时，以上例来说，B程式结束Hook，则换A可
以直接拦截讯息。

KeyBoard Hook的范例
Hook Function的三个叁数
nCode wParam lParam 传回值
HC_ACTION 表按键Virtual Key 与WM_KEYDOWN同 若讯息要被处理传0
或 反之传1
HC_NOREMOVE

Public hHook As Long
Public Sub UnHookKBD()
If hnexthookproc <> 0 Then
UnhookWindowsHookEx hHook
hHook = 0
End If
End Sub

Public Function EnableKBDHook()
If hHook <> 0 Then
Exit Function
End If
hHook = SetWindowsHookEx(WH_KEYBOARD, AddressOf MyKBHFunc, App.hInstance, App.ThreadID)
End Function

Public Function MyKBHFunc(ByVal iCode As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
MyKBHFunc = 0 '表示要处理这个讯息
If wParam = vbKeySnapshot Then '侦测 有没有按到PrintScreen键
MyKBHFunc = 1 '在这个Hook便吃掉这个讯息
End If
Call CallNextHookEx(hHook, iCode, wParam, lParam) '传给下一个Hook
End Function