为什么我用VB6+WH_Mouse_LL做的全局钩子，用CallNextHookEx不能把消息传递给下一个钩子 - VC/MFC / 进程/线程/DLL
为什么我用VB6+WH_Mouse_LL做的全局钩子，用CallNextHookEx不能把消息传递给下一个钩子,代码如下:
--------------------------------------
modPub.bas:
Option Explicit
Public hSetWindowsHookEx As Long
Public Function LowLevelMouseProc(ByVal nCode As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim typMHS As MSLLHOOKSTRUCT
Dim pt As POINTAPI
Dim rectWindowPosSize As RECT
If nCode > = 0 Then
If wParam = WM_MOUSEMOVE Then
Call CopyMemory(typMHS, ByVal lParam, LenB(typMHS))
pt = typMHS.pt
With frmMain
.txtX = pt.X
.txtY = pt.Y
End With
End If
End If
Debug.Print CallNextHookEx(hSetWindowsHookEx, nCode, wParam, lParam)
' Debug.Print "CallNextHookEx： " & hSetWindowsHookEx
' CallNextHookEx hSetWindowsHookEx, nCode, wParam, lParam
' LowLevelMouseProc = CallNextHookEx(hSetWindowsHookEx, nCode, wParam, lParam)
Call CallNextHookEx(hSetWindowsHookEx, nCode, wParam, lParam)
' LowLevelMouseProc = CallNextHookEx(0, nCode, wParam, lParam)
End Function
--------------------------------------
frmMain.bas:
Option Explicit
Private Sub Form_Load()
hSetWindowsHookEx = SetWindowsHookEx(WH_MOUSE_LL, AddressOf LowLevelMouseProc, App.hInstance, 0)
End Sub
Private Sub Form_Unload(Cancel As Integer)
UnhookWindowsHookEx hSetWindowsHookEx
End Sub
--------------------------------------
modAPI.bas:
Option Explicit
'###################################################################################################################
'设置窗体位置
Public Declare Function SetWindowPos Lib "user32 " _
( _
ByVal hwnd As Long, _
ByVal hWndInsertAfter As Long, _
ByVal X As Long, _
ByVal Y As Long, _
ByVal cx As Long, _
ByVal cy As Long, _
ByVal wFlags As Long _
) As Long
'--------------------------------------------------------------------
'hWndInsertAfter Parameter Value
Public Const HWND_BOTTOM = 1
Public Const HWND_BROADCAST = &HFFFF&
Public Const HWND_DESKTOP = 0
Public Const HWND_NOTOPMOST = -2
Public Const HWND_TOP = 0
Public Const HWND_TOPMOST = -1
'--------------------------------------------------------------------
'wFlags Paramter Value
Public Const SWP_FRAMECHANGED = &H20 ' The frame changed: send WM_NCCALCSIZE
Public Const SWP_HIDEWINDOW = &H80
Public Const SWP_NOACTIVATE = &H10
Public Const SWP_NOCOPYBITS = &H100
Public Const SWP_NOMOVE = &H2
Public Const SWP_NOOWNERZORDER = &H200 ' Don 't do owner Z ordering
Public Const SWP_NOREDRAW = &H8
Public Const SWP_NOSIZE = &H1
Public Const SWP_NOREPOSITION = SWP_NOOWNERZORDER
Public Const SWP_NOZORDER = &H4
Public Const SWP_SHOWWINDOW = &H40
Public Const SWP_DRAWFRAME = SWP_FRAMECHANGED
'###################################################################################################################
'类似QQ，窗体自动上浮API
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 CallNextHookEx Lib "user32 " (ByVal hHook As Long, ByVal nCode As Long, ByVal wParam As Long, lParam As Any) As Long
Public Declare Function UnhookWindowsHookEx Lib "user32 " (ByVal hHook As Long) As Long
Public Type POINTAPI
X As Long
Y As Long
End Type
Public Type MSLLHOOKSTRUCT
pt As POINTAPI
mouseData As Long
Flags As Long
time As Long
dwExtraInfo As Long
End Type
Public Const WH_MOUSE_LL As Long = 14
Public Const WM_MOUSEMOVE = &H200
Public Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Public Declare Sub CopyMemory Lib "kernel32 " Alias "RtlMoveMemory " (Destination As Any, Source As Any, ByVal Length As Long)
Public Declare Function GetWindowRect Lib "user32 " (ByVal hwnd As Long, lpRect As RECT) As Long
'###########################################################################################################
Public Declare Function ShellExecute Lib "shell32.dll " Alias "ShellExecuteA " ( _
ByVal hwnd As Long, _
ByVal lpOperation As String, _
ByVal lpFile As String, _
ByVal lpParameters As String, _
ByVal lpDirectory As String, _
ByVal nShowCmd As Long) As Long
Public Const SW_SHOWNORMAL = 1
------------------------------------
谢谢大家解答！！！
[解决办法]
在CallNextHookEx前面設置 LowLevelMouseProc 值;試一試!
LowLevelMouseProc=1 '取消原本要完成的動作
LowLevelMouseProc=0 '令待完成的動作繼續完成
Call CallNextHookEx(hSetWindowsHookEx, nCode, wParam, lParam)
[解决办法]
LowLevelMouseProc=0 就是把传给一下程序
LowLevelMouseProc=1 就是本过程抓住这个HOOK不放，当然鼠标指针就不动了。
当然，你可以不加这两句中的任意一句，因为默认LowLevelMouseProc=0，如果当你鼠标移动时，哪两个文本框的坐标注在变，哪说明程序运行正常，而且CallNextHookEx也把消息传递给了下一个钩子
[解决办法]
啊,原来是运行多个实例时的问题是吧
[解决办法]
我把以前写的代码拿出来看了一下,的确有这个问题
想从MSDN里找找答案,看看是不是这个_LL HOOK只能挂一个
结果看晕了过去@_@
然后又用了一下原来在网上下载的那个HOOK例子代码,是把代码放在ActiveX DLL里面再在工程里引用
这个代码就没有那样的问题,多个实例都可以拦截到鼠标事件,不过却不是使用的_LL HOOK.
建议LZ把你所谓 "没问题的 "C#代码发上来,看看是否是使用的_LL HOOK(我很怀疑.)
[解决办法]
'鼠标钩子
Public Function CallMouseHookProc(ByVal code As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If code <> 0 Then
CallMouseHookProc = CallNextHookEx(lHook, code, wParam, lParam)
End If
End Function
我已经这样了.
然后再把显示坐标的那个EXE运行,再运行这样的一个EXE,那个EXE仍然不正常了.
看来这里面有点问题,研究一下....
同时也希望高人们指点一下.....或者E文好的朋友帮弄弄MSDN.....
[解决办法]
我也来帮顶一下
希望懂的高手讲解一下.....不一定有代码都行....原理..就可以了.....
[解决办法]
老兄，还是不要拿VB做钩子了吧，我搜过很多资料，提到过VB的弱点就是不善于做多线程和钩子，尤其是钩子，出了问题都没法调试的
[解决办法]
汗一个....去年的帖子了,还没有解决?
[解决办法]
这是个低级的钩子，我有本书专门讲解这个钩子的，很不错，是电子版的，谁要？
[解决办法]
以后需再关注，现在先帮你顶一下
[解决办法]
是你的用法有问题
把最后CallNextHookEx那里换成这一句
LowLevelMouseProc = CallNextHookEx(hSetWindowsHookEx, nCode, wParam, Byval lParam)
你的lParam前面少了一个Byval
所以会发生你说的那种情况
加上就好了
