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This article was previously published under Q194294
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An ActiveX control can have a toolbar (a CToolBar class) as its childwindow. This article shows a way to create such a toolbar and also how toimplement tooltips for buttons on the toolbar window.
Visual C++ provides two methods to create a toolbar. The article desribeshow to create a toolbar resource using the Resource Editor. If you alreadyhave a bitmap resource, please refer to the online documentation"Converting Bitmaps to Toolbars" for converting your bitmap resource to atoolbar resource.

Steps are shown below:

  1. Use the MFC ActiveX Control Wizard to generate an MFC ActiveX control.
  2. Create a Toolbar resource in the control's project.
  3. Add a tooltip string resource for each button in the toolbar. These tooltip string resources will be loaded in the TTN_NEEDTEXT notification code handler.
  4. Add a WH_GETMESSAGE hook callback function to the ActiveX control- derived class. The hook procedure is in charge of calling the application's PreTranslateMessage(), and this results in the call to FilterToolTipMessage(), which activates tooltips. A hook procedure is needed because the ActiveX control is just like an inproc server[ASCII 151]no message pump is found:
          HHOOK hHook = NULL;      // Hook procedure for WH_GETMESSAGE hook type.      LRESULT CALLBACK GetMessageProc(int nCode, WPARAM wParam, LPARAM         lParam)      {        // Switch the module state for the correct handle to be used.        AFX_MANAGE_STATE(AfxGetStaticModuleState( ));        // If this is a keystrokes message, translate it in controls'        // PreTranslateMessage().        LPMSG lpMsg = (LPMSG) lParam;        if( (nCode >= 0) &&          PM_REMOVE == wParam &&          AfxGetApp()->PreTranslateMessage(lpMsg))        {           lpMsg->message = WM_NULL;           lpMsg->lParam = 0L;           lpMsg->wParam = 0;        }       // Passes the hook information to the next hook procedure in       // the current hook chain.       return ::CallNextHookEx(hHook, nCode, wParam, lParam);      }					
  5. Create the toolbar window (a CToolBar class), which is a child window of the ActiveX control. This is done in response to WM_CREATE message. In addition, WM_CREATE message handler is also a good place to install the WH_GETMESSAGE hook procedure.
          int CCToolBarCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)      {         if (COleControl::OnCreate(lpCreateStruct) == -1)            return -1;         // Create a CToolBar window which is a child of ActiveX control.         if (!m_ToolBar.Create(this,               WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_TOOLTIPS) ||              !m_ToolBar.LoadToolBar(IDR_TOOLBAR))            {               TRACE0("Failed to create toolbar\n");               return -1;      // fail to create            }         // Toolbar has to have TBSTYLE_TOOLTIPS style. Otherwise,         // notification handler for TTN_NEXTTEXT won't be called.         m_ToolBar.ModifyStyle (0, TBSTYLE_TOOLTIPS);         // Move the toolbar so it is VISIBLE on the screen.         CRect rc;         GetClientRect(&rc);         rc.bottom = + 34;         m_ToolBar.MoveWindow(&rc);         // Because ActiveX control is an inproc server, it does not have a         // message pump. So, messages to child windows created by the         // ActiveX control are not going to be received by the control.         // Thus, we set up a message hook to call PreTranslateMessage().         // This results in the call to FilterToolTipMessage(), which         // activates tooltips.         hHook = ::SetWindowsHookEx(            WH_GETMESSAGE,            GetMessageProc,            AfxGetInstanceHandle(),            GetCurrentThreadId());         ASSERT (hHook);         return 0;      }					
  6. Uninstall the message hook function in response to WM_DESTROY message:
          void CCToolBarCtrl::OnDestroy()      {         // Remove the message hook function.         VERIFY (::UnhookWindowsHookEx (hHook));         COleControl::OnDestroy();      }					
  7. Add a TTN_NEEDTEXTW (for Unicode notification code) or TTN_NEEDTEXTA (for ANSI notification code) notification handler to the ActiveX control-derived class. Load the tooltip string to be displayed in this notification code handler:
          BEGIN_MESSAGE_MAP(CCToolBarCtrl, COleControl)         //<AngularNoBind>{{</AngularNoBind>AFX_MSG_MAP(CCToolBarCtrl)         ON_WM_CREATE()         ON_COMMAND(ID_BUTTON1, OnButton1) // first button on toolbar         ON_COMMAND(ID_BUTTON2, OnButton2) // second button on toolbar         ON_COMMAND(ID_BUTTON3, OnButton3) // third button on toolbar         ON_WM_DESTROY()         //<AngularNoBind>}}</AngularNoBind>AFX_MSG_MAP         ON_OLEVERB(AFX_IDS_VERB_PROPERTIES, OnProperties)         // ANSI notification code (for Windows 95)         ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTA, 0, 0xFFFF, OnToolTipNotify)         // Unicode notification code (for NT)         ON_NOTIFY_EX_RANGE(TTN_NEEDTEXTW, 0, 0xFFFF, OnToolTipNotify)      END_MESSAGE_MAP()      // Notification handler for tooltips - determine which tooltip      // string resource to be displayed.      BOOL CCToolBarCtrl::OnToolTipNotify(         UINT id, NMHDR * pNMHDR, LRESULT * pResult)      {         TOOLTIPTEXTA* pTTTA = (TOOLTIPTEXTA*) pNMHDR;         TOOLTIPTEXTW* pTTTW = (TOOLTIPTEXTW*) pNMHDR;         int strid = 0;         switch (pNMHDR->idFrom)         {         case ID_BUTTON1:            strid = IDS_BUTTON1;            break;         case ID_BUTTON2:            strid = IDS_BUTTON2;            break;         case ID_BUTTON3:            strid = IDS_BUTTON3;            break;         }  if (strid)       {          *pResult = 0;            CString str;          str.LoadString(strid);            #define _countof(array) (sizeof(array)/sizeof(array[0]))            #ifndef _UNICODE          if (pNMHDR->code == TTN_NEEDTEXTA)          lstrcpyn(pTTTA->szText, str, _countof(pTTTA->szText));          else          _mbstowcsz(pTTTW->szText, str, _countof(pTTTW->szText));          #else          if (pNMHDR->code == TTN_NEEDTEXTA)          _wcstombsz(pTTTA->szText, str, _countof(pTTTA->szText));          else          lstrcpyn(pTTTW->szText, str, _countof(pTTTW->szText));          #endif             return TRUE;        }         return FALSE;      } 					
(c) Microsoft Corporation 1998, All Rights Reserved. Contributions by Yeong-Kah Tam, Microsoft Corporation.
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