关于鼠标钩子的问题，请高手帮忙！！！！

Question

case WM_MOUSEMOVE:
...
return; //replace break;case WM_LBUTTONDOWN:
...
return; //replace break;case WM_LBUTTONUP:
...
return; //replace break;

Answer 1

我的处理函数如下：请指教以下。LRESULT CTestDlg::OnMyMouseMove(WPARAM wParam, LPARAM lParam)
{
switch (wParam)
{
case 0: //WM_LBUTTONDOWN
{
if(!bMoving)
{
Start=false;
bMoving=true;
CPoint pXY;
::GetCursorPos(&pXY);
m_StrokePoint->AddPoint(CPoint(pXY.x,pXY.y));
}
return 0;
break;
}

case 1://鼠标移动事件WM_MOUSEMOVE
{
if(bMoving)
{  
CDC *pDC;
pDC = CDC::FromHandle(::GetDC(NULL));
CPen cNewPen(PS_SOLID,4,RGB(255,0,0)), *pOldPen;
pOldPen = pDC->SelectObject(&cNewPen);
CPoint pXY;
::GetCursorPos(&pXY);
m_StrokePoint->AddPoint(CPoint(pXY.x,pXY.y));
int nSize = m_StrokePoint->GetPointCount();
pDC->MoveTo(m_StrokePoint->GetAt(nSize-2));
pDC->LineTo(pXY.x,pXY.y);
pDC->SelectObject(pOldPen);
Start=false;
}
return 0;
break;
}
case 2: //WM_LBUTTONUP
{
//StopHook(m_hWnd);
if (bMoving) 
{
bMoving=false;
m_StrokeArray.Add(m_StrokePoint);
m_StrokePoint = new CElectricInkStrokeU();

SetTimer(1,1000,NULL);
Start=true;
}
return 0;
break;
}
case 3://WM_RBUTTONDOUN
return 0;
break;
}
return 0;
} 

Answer 2

上面的代码是hookproc的代码？？？

Answer 3

不是，它是消息处理函数。我想时不时在这儿改的。hookproc的代码如下：LRESULT WINAPI MouseProc(int nCode,WPARAM wparam,LPARAM lparam)
{
LPMOUSEHOOKSTRUCT pMouseHook=(MOUSEHOOKSTRUCT FAR *)lparam;
if (nCode>=0)
{
/*============================================================================
如下代码是得到父窗口标题文本的做法
HWND glhTargetWnd=pMouseHook->hwnd;     //取目标窗口句柄
HWND ParentWnd=glhTargetWnd;
while (ParentWnd !=NULL)
{
glhTargetWnd=ParentWnd;
ParentWnd=GetParent(glhTargetWnd);   //取应用程序主窗口句柄
}
===========================================================================*/
HWND glhTargetWnd=XYZWindowFromPoint(NULL,pMouseHook->pt);    //用上面的一段注释掉的代码替换此行是得到父窗口标题文本的做法
if(glhTargetWnd!=glhPrevTarWnd)
{
char szCaption[256];
GetWindowText(glhTargetWnd,szCaption,100);
//取目标窗口标题
if(IsWindow(glhDisplayWnd))
SendMessage(glhDisplayWnd,WM_SETTEXT,0,(LPARAM)(LPCTSTR)szCaption);
glhPrevTarWnd=glhTargetWnd;
//保存目标窗口
}
}
return CallNextHookEx(glhHook,nCode,wparam,lparam);
//继续传递消息
}

Answer 4

我把 return CallNextHookEx(glhHook,nCode,wparam,lparam);//继续传递消息
替换成 break; 出现编译错误。（ error C2043: illegal break）StartHook 如下：BOOL CMouseHook::StartHook(HWND hWnd)
{
BOOL bResult=FALSE; glhHook=SetWindowsHookEx(WH_MOUSE,MouseProc,glhInstance,0); if(glhHook!=NULL)
bResult=TRUE;
glhDisplayWnd=hWnd;

return bResult; 
}我是初学者请多指教。

Answer 5

除了最后一个return 0， 其余的统统换成 return 1 试一试

Answer 6

请看以下下面的HOOK代码，给你们的意见。谢谢！HINSTANCE hInst;
UINT UWM_MOUSEMOVE;
HHOOK hook;
static LRESULT CALLBACK msghook(UINT nCode, WPARAM wParam, LPARAM lParam);BOOL APIENTRY DllMain( HINSTANCE hInstance, 
  DWORD  Reason, 
  LPVOID Reserved
  )
{
switch(Reason)
    { /* reason */
case DLL_PROCESS_ATTACH:
hInst = hInstance;
UWM_MOUSEMOVE = RegisterWindowMessage(UWM_MOUSEMOVE_MSG);
return TRUE;
case DLL_PROCESS_DETACH:
if(hWndServer != NULL)
StopHook(hWndServer);
return TRUE;
    } /* reason */
    return TRUE;
}
/****************************************************************************
*                                 setMyHook
* Inputs:
*       HWND hWnd: Window to notify
* Result: BOOL
*       TRUE if successful
* FALSE if error
* Effect: 
*       Sets the hook
****************************************************************************/__declspec(dllexport) BOOL StartHook(HWND hWnd)
{
if(hWndServer != NULL)
return FALSE; // already hooked!
hook = SetWindowsHookEx(WH_GETMESSAGE,
(HOOKPROC)msghook,
hInst,
0);
if(hook != NULL)
{ /* success */
hWndServer = hWnd;
return TRUE;
} /* success */
return FALSE; // failed to set hook
} // setMyHook

  /****************************************************************************
  *                                 clearMyHook
  * Inputs:
  *       HWND hWnd: Window hook
  * Result: BOOL
  *       TRUE if successful
  * FALSE if error
  * Effect: 
  *       Removes the hook that has been set
****************************************************************************/__declspec(dllexport) BOOL StopHook(HWND hWnd)
{
if(hWnd != hWndServer || hWnd == NULL)
return FALSE;
BOOL unhooked = UnhookWindowsHookEx(hook);
if(unhooked)
hWndServer = NULL;
return unhooked;
} // StopHook

  /****************************************************************************
  *                                   msghook
  * Inputs:
  *       int nCode: Code value
  * WPARAM wParam:
  * LPARAM lParam:
  * Result: LRESULT
  *       Either 0 or the result of CallNextHookEx
  * Effect: 
  *       Hook processing function. If the message is a mouse-move message,
  * posts the coordinates to the parent window
****************************************************************************/static LRESULT CALLBACK msghook(UINT nCode, WPARAM wParam, LPARAM lParam)
{
if(nCode < 0)
{ /* pass it on */
CallNextHookEx(hook, nCode, wParam, lParam);
return 0;
} /* pass it on */
LPMSG msg = (LPMSG)lParam;

switch(msg->message)
{
case WM_LBUTTONDOWN:
{
PostMessage(hWndServer, UWM_MOUSEMOVE, 0, 0);
break;
}
case WM_MOUSEMOVE:
case WM_NCMOUSEMOVE:
{
PostMessage(hWndServer, UWM_MOUSEMOVE, 1, 0);
break;
}
case WM_LBUTTONUP:
{
PostMessage(hWndServer, UWM_MOUSEMOVE, 2, 0);
break;
}
case WM_RBUTTONDOWN:
{
PostMessage(hWndServer, UWM_MOUSEMOVE, 3, 0);
break;
}
case WM_RBUTTONUP:
{
PostMessage(hWndServer, UWM_MOUSEMOVE, 4, 0);
break;
}
default:
break;
}

return CallNextHookEx(hook, nCode, wParam, lParam);
} // msghook
return CallNextHookEx(hook, nCode, wParam, lParam); //replace return 0; 还是不行。