如何拦截键盘输入来源:cww这是使用Keyboard Hook 的范例,它的解释请查VB5 Call WinAPI技巧
或Hook的简介
'以下在.Bas
Option ExplicitDeclare 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 LongPublic hnexthookproc As Long
Public Const HC_ACTION = 0
Public Const WH_KEYBOARD = 2Public Sub UnHookKBD()
If hnexthookproc <> 0 Then
UnhookWindowsHookEx hnexthookproc
hnexthookproc = 0
End If
End Sub
Public Function EnableKBDHook()
If hnexthookproc <> 0 Then
Exit Function
End If
hnexthookproc = SetWindowsHookEx(WH_KEYBOARD, AddressOf _
MyKBHFunc, App.hInstance, 0)
If hnexthookproc <> 0 Then
EnableKBDHook = hnexthookproc
End If
End Function
Public Function MyKBHFunc(ByVal iCode As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
'这三个叁数是固定的,不能动,而MyKBHFunc这个名称只要和
'SetWindowsHookex()中 AddressOf後的名称一样便可,不一定叫什麽
'wParam 是传入按了哪个key的virtual-key code '如果您将以下的两行un则所有键盘的输入皆没有作用
'MyKBHFunc = 1 '吃掉讯息
'Exit Function MyKBHFunc = 0 '讯息要处理
If iCode < 0 Then
MyKBHFunc = CallNextHookEx(hnexthookproc, iCode, wParam, lParam)
Exit Function
End If
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
Debug.Print "haha"
Else
Call CallNextHookEx(hnexthookproc, iCode, wParam, lParam)
End If
End Function'以下在Form
Private Sub Form_Load()
Call EnableKBDHook
End SubPrivate Sub Form_Unload(Cancel As Integer)
Call UnHookKBD
End Sub
或Hook的简介
'以下在.Bas
Option ExplicitDeclare 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 LongPublic hnexthookproc As Long
Public Const HC_ACTION = 0
Public Const WH_KEYBOARD = 2Public Sub UnHookKBD()
If hnexthookproc <> 0 Then
UnhookWindowsHookEx hnexthookproc
hnexthookproc = 0
End If
End Sub
Public Function EnableKBDHook()
If hnexthookproc <> 0 Then
Exit Function
End If
hnexthookproc = SetWindowsHookEx(WH_KEYBOARD, AddressOf _
MyKBHFunc, App.hInstance, 0)
If hnexthookproc <> 0 Then
EnableKBDHook = hnexthookproc
End If
End Function
Public Function MyKBHFunc(ByVal iCode As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
'这三个叁数是固定的,不能动,而MyKBHFunc这个名称只要和
'SetWindowsHookex()中 AddressOf後的名称一样便可,不一定叫什麽
'wParam 是传入按了哪个key的virtual-key code '如果您将以下的两行un则所有键盘的输入皆没有作用
'MyKBHFunc = 1 '吃掉讯息
'Exit Function MyKBHFunc = 0 '讯息要处理
If iCode < 0 Then
MyKBHFunc = CallNextHookEx(hnexthookproc, iCode, wParam, lParam)
Exit Function
End If
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
Debug.Print "haha"
Else
Call CallNextHookEx(hnexthookproc, iCode, wParam, lParam)
End If
End Function'以下在Form
Private Sub Form_Load()
Call EnableKBDHook
End SubPrivate Sub Form_Unload(Cancel As Integer)
Call UnHookKBD
End Sub
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为什么我焦点不在VB上的时候还是没用
to Yan5453()
是的,我把程序中Debug.Print "haha"改为form1.text1.text="ok" 然后打开WINDOWS中的记事本,再按PrintScreen键,然后点击VB程序查看结果, form1中的text1并没显示"ok"
是好像得做个DLL!
[email protected]
Public Declare Function GetAsyncKeyState Lib "user32" Alias "GetAsyncKeyState" (ByVal vKey As Long) As Integer
正好我有原代码:)
http://507www.go.163.com/file/hook.zip
Public Const WM_KEYDOWN = &H100
Public Const WM_KEYUP = &H101
Public Const HC_ACTION = 0Public Const WH_JOURNALRECORD = 0
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)
Declare Function MapVirtualKey Lib "user32" Alias "MapVirtualKeyA" _
(ByVal wCode As Long, ByVal wMapType As Long) As Long
Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As IntegerPublic hHook As Long
Public msg As EVENTMSGSub EnableHook()
hHook = SetWindowsHookEx(0, AddressOf HookProc, App.hInstance, 0)
End SubSub FreeHook()
Dim ret As Long
ret = UnhookWindowsHookEx(hHook)
End SubFunction HookProc(ByVal code As Long, ByVal wParam As Long, _
ByVal lParam As Long) As Long
Dim i As Long, j As Integer, str1 As String
If code <> HC_ACTION Then
HookProc = CallNextHookEx(hHook, code, wParam, lParam)
Exit Function
End If
CopyMemory msg, lParam, LenB(msg)
If msg.message = WM_KEYDOWN Then
i = MapVirtualKey(msg.paramL, 2)
str1 = Chr(i And &HFF)
Form1.List1.AddItem (str1)
End If
HookProc = CallNextHookEx(hHook, code, wParam, lParam)
End Function