Problems with creating a mouse hook using the Windows API

Question

I am trying to create a mouse hook using the Windows API. Currently, I have the following code, but I am struggling to make it work. Perhaps some sample code would help me to understand the concepts better.

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    HWND hWindow , hEntryWnd;
    HRESULT hResult;
    ztcEvents pEvent;
    ztcField *p_click_field;
    ztcInterfaceContext *p_context_interface;
    TCHAR      className [32];
    HWND hWnd;
    if (nCode < 0) // do not process message 
        return CallNextHookEx(hook, nCode, wParam, lParam); 
    MOUSEHOOKSTRUCT *msg = (MOUSEHOOKSTRUCT *)lParam;

    switch (nCode) 
    { 
    case HC_ACTION: 
        {
            hWnd                =  msg->hwnd;
            p_click_field       = pEvent.GetMatchField(hWnd);
            p_context_interface = pEvent.getMarkInterface();
            if(p_click_field == NULL || p_context_interface == NULL)
            {
                break;
            }
            GetClassName(p_click_field->Widget ()->WindowHandle() , className , sizeof (className ) - 1 );

            if(p_click_field->Widget()->IsKindOf(RUNTIME_CLASS(ztcOleWdgt)))
            {
                switch(wParam)
                {
                    case WM_LBUTTONDOWN:

                        hWindow = p_click_field->Widget()->Parent()->WindowHandle();
                        hEntryWnd = p_click_field->Widget()->WindowHandle();

                        ::PostMessage(hWindow , OLE_NOTIFY , (WPARAM)hEntryWnd , OLE_LCLICK);
                        /*pEvent.SetVariables(p_click_field , evClick ,etFormField , true , p_context_interface);
                        SetEvent(hEventWnd);*/
                        fprintf(trace_event , "buttonClick\t%x\n" , msg->hwnd );
                        fflush(trace_event);
                        break;
                    case WM_RBUTTONDOWN:
                        fprintf(trace_event , "RightClick\n");
                        fflush(trace_event);
                        break;
                    case WM_LBUTTONDBLCLK:
                        fprintf(trace_event , "ButtonDoubleClick\n");
                        fflush(trace_event);
                        break;
                }
            }
        }

        break;
      default:
        break;
    }
    return CallNextHookEx(hook, nCode, wParam, lParam); 
}

While clicking the left mouse button, the code above went into the case WM_LBUTTONDOWN for more than 30 times. Is there something wrong with my code? If so, how can I fix it?

you can just google if you just want to see any random example. Do you have a more specific question? What have you tried? Most importantly: What kind of hook? For what purpose? — tenfour, Feb 11 '11 at 11:40
I have handle of ole widgets and using that handle , i have to keep track of mouse click events and setfocus and kill focus events. — karthik, Feb 11 '11 at 11:43
As this is now a real question about problems with a mouse hook procedure, I'm voting to re-open. — Cody Gray - on strike, Feb 15 '11 at 05:28
I made the mistake in using the function SetWindowsHookEx(). I list out the problems, 1)Calling this function in infinite getmessage() while loop. 2)we have to release the hook by UnhookWindowsHookEx() function. — karthik, Feb 15 '11 at 06:54

score 2 · Accepted Answer · edited Feb 15 '19 at 05:26

2

Are you clicking the mouse button more than 30 times? There will be an WM_LBUTTONDOWN message sent each the the mouse button is clicked, even if it is part of a double-click. That's a consequence of how Windows recognizes a double-click in the absence of a way to go back in time.

This sample looks trustworthy, and was written by a fairly reputable author:

Hooks and DLLs

edited Feb 15 '19 at 05:26

Bhargav Rao

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answered Feb 11 '11 at 11:47

Cody Gray - on strike

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I updated my sample code.Please look into it. – karthik Feb 15 '11 at 05:23

Problems with creating a mouse hook using the Windows API

1 Answers1