int CDeleteTrayNullIconDlg::DeleteTrayNullIcon(BOOL &bNullBeDel)
{
    HWND  hNotify1;
    int iMethod=0;
    bNullBeDel = FALSE;
    HWND  hStatus=::FindWindow("Shell_TrayWnd",NULL);  //得到任務欄句柄
    if  (hStatus==NULL) 
    { 
        //AfxMessageBox ( "Get Shell_TrayWnd error!" );
        return -1; 
    } 
    HWND  hNotify=FindWindowEx(hStatus,NULL,"TrayNotifyWnd",NULL); //右下角區域
    if  (hNotify==NULL)
    { 
        //AfxMessageBox ( "Get TrayNotifyWnd error!" );
        return -1; 
    }
goto1:
    if (iMethod<1)
    {
        hNotify1=FindWindowEx(hNotify,NULL,"SysPager",NULL);
        if  (hNotify==NULL) 
        { 
            //AfxMessageBox ( "Get SysPager error!" );
            return -1; 
        }
        if (hNotify1==NULL)
        {
            hNotify1=hNotify;
        }
    }
    else
    {
        hNotify1=hNotify;
    }

    HWND  hNotify1_0=FindWindowEx(hNotify1,NULL,"ToolBarWindow32",NULL);//右下角區域(不包括時間)
    if  (hNotify1_0==NULL)  
    { 
        //AfxMessageBox ( "Get ToolBarWindow32 error!" );
        return -1; 
    } 
    //-------------------以上是得到任務欄右下腳一塊地方的句柄
    DWORD  pid = 0; 
    GetWindowThreadProcessId(hNotify1_0,&pid); 
    if  (pid==NULL) 
    { 
        //AfxMessageBox ( "Get pid error!" );
        return -1; 
    }  
   
    HANDLE  hProcess=OpenProcess(PROCESS_QUERY_INFORMATION|PROCESS_ALL_ACCESS,true,pid); 
    if  (hProcess==NULL) 
    { 
        //AfxMessageBox ( "Get hd error!" );
        return -1; 
    } 
    ::SendMessage(hNotify1_0,WM_PAINT ,NULL,NULL);
    CRect rect;
    ::GetWindowRect(hNotify1_0,&rect);
    ::InvalidateRect(hNotify1_0,&rect,FALSE);

    int  iNum=::SendMessage(hNotify1_0,TB_BUTTONCOUNT ,NULL,NULL);  //獲取任務欄上圖標個數
    if (iNum<1 && iMethod==0)
    {
        iMethod=2;
        goto goto1;
    }

    unsigned long n = 0; 
    TBBUTTON  *pButton = new TBBUTTON; 
    CString  strInfo = _T(""); 
    wchar_t  name[256] = {0}; 
    TBBUTTON  BButton;
    unsigned   long    whd,proid;
    CString x;
   
    for(int i=0; i<iNum; i++) 
    { 
        ::SendMessage(hNotify1_0,TB_GETBUTTON,i,(LPARAM)(&BButton)); 
        ReadProcessMemory(hProcess,&BButton,pButton,sizeof(TBBUTTON),&n);  
        if  (pButton->iString != 0xffffffff) 
        { 
            try 
            { 
                ReadProcessMemory(hProcess,(void *)pButton->iString,name,255,&n);
            }
            catch(...) 
            { 
            }     
            strInfo.Format("%d : %s ",i+1,CString(name));
            TRACE(strInfo);
        }
       
        try
        {  
            whd=0;  
            ReadProcessMemory(hProcess,(void *)pButton->dwData,&whd,4,&n);  
        }  
        catch(...)
        {  
        }  
        proid=NULL;
        GetWindowThreadProcessId((HWND)whd,&proid);  
        if(proid==NULL)
        {
            bNullBeDel = TRUE;
            ::SendMessage(hNotify1_0,TB_DELETEBUTTON,i,0);
        }
    }
    delete pButton;

    return 0;
}

原作者謝紅偉，上代碼我作了幾個地方修改與優化

#define  WM_NOTIFYICON WM_USER+5

void CDeleteTrayNullIconDlg::OnButton1()
{
BOOL bNullBeDel = FALSE;
do
{
  DeleteTrayNullIcon ( bNullBeDel );
} while ( bNullBeDel );

NOTIFYICONDATA ni;
ni.cbSize=sizeof(ni);
ni.hIcon=m_hIcon;
//ni.hWnd=m_pMainWnd->m_hWnd;
//strcpy(nd.szTip, "我的托盤");
ni.uCallbackMessage=WM_NOTIFYICON;
ni.uFlags= NIF_ICON | NIF_MESSAGE | NIF_TIP ;
ni.uID=IDR_MAINFRAME;

Shell_NotifyIcon(NIM_ADD, &ni);
Shell_NotifyIcon(NIM_DELETE, &ni);
AfxMessageBox ( "清除無效的托盤圖標已經完成", MB_ICONINFORMATION );

}