Change dialog font at runtime

Question

I'd like to change the font of a few dialogs. The fonts of these dialogs are not to be changed using the ressource editor they are to be changed at runtime.

The dialogs in question are all based on ATL/WTL and they're declared pretty much like the following example:

class CDiscardErrorDlg :
public CDialogImpl<CDiscardErrorDlg>,
public CDialogResize<CDiscardErrorDlg>
{
}

My question is how to change the font for a whole CDialogImpl derived class. As far as I know, changing the DLGTEMPLATE is the way to go. But I have no idea on how to achieve that!?! Where do I have access to DLGTEMPLATE's? Is CDialogImpl the correct class to solve my problem?

Do you have an idea or web reference which might help me on that problem?

Does [this](https://stackoverflow.com/questions/204334/how-to-manipulate-dlgtemplate-programmatically) or [this](https://github.com/csells/sb-blot/blob/c746fa3348f73056a57d34836366d36198c719ee/public/tools/AtlPropSheet.h#L577) help? — Roman R., Aug 10 '21 at 13:00
The problem there's different from my problem. But I have already found a working solution. Many thanks for helping — Marc, Aug 13 '21 at 04:55

score 0 · Accepted Answer · answered Aug 13 '21 at 04:53

just wanted to let you know that I have found a solution to the problem:

Here's what to do:

derive a class from CDialogImpl
overwrite DoModal
load the DLGTEMPLATE template in memory and
take an instance of CDialogTemplate to change the template's font

pass the modified template to DialogBoxIndirectParam

template <class T, class TBase = CWindow > class ATL_NO_VTABLE CDialogImplEx : public CDialogImpl<T, TBase> { public:

 INT_PTR DoModal(
     _In_ HWND hWndParent = ::GetActiveWindow(),
     _In_ LPARAM dwInitParam = NULL)
 {
     T* pT = static_cast<T*>(this);
     ATLASSERT(pT->m_hWnd == NULL);

     LPDLGTEMPLATE pTemplate = nullptr;

     HINSTANCE hInstance = AfxGetResourceHandle();
     HRSRC hDlg = AtlFindResource(hInstance, MAKEINTRESOURCE(static_cast<T*>(this)->IDD), RT_DIALOG);
     if (hDlg != NULL)
     {
         HRSRC hDlgInit = AtlFindResource(hInstance, MAKEINTRESOURCE(static_cast<T*>(this)->IDD), _ATL_RT_DLGINIT);
         HGLOBAL hData = NULL;
         BYTE* pInitData = NULL;

         if (hDlgInit)
         {
             hData = ::LoadResource(hInstance, hDlgInit);
             ATLASSUME(hData != nullptr);
             pInitData = (BYTE*) ::LockResource(hData);
         }

         DWORD dwLastError = 0;
         HGLOBAL hResource = LoadResource(hInstance, hDlg);
         if (hResource != nullptr)
         {
             DLGTEMPLATE* pTempl = (DLGTEMPLATE*)LockResource(hResource);
             CDialogTemplate DialogTempl(pTempl);

             DialogTempl.SetFont(_T("Segoe UI"), 20); // Set a huge font

             HGLOBAL hDialogTemplate = DialogTempl.Detach();

             pTemplate = (DLGTEMPLATE*)::GlobalLock(hDialogTemplate);

             ::FreeResource(hResource);
             hResource = nullptr;
         }
         else
         {
             dwLastError = ::GetLastError();
         }
     }

#if (_ATL_VER >= 0x0800) // Allocate the thunk structure here, where we can fail gracefully. BOOL bRet = m_thunk.Init(nullptr, nullptr); if (bRet == FALSE) { ::SetLastError(ERROR_OUTOFMEMORY); return -1; } #endif // (_ATL_VER >= 0x0800)

     _AtlWinModule.AddCreateWndData(&m_thunk.cd, (ATL::CDialogImplBaseT< TBase >*)pT);

#ifdef _DEBUG m_bModal = true; #endif // _DEBUG

     INT_PTR nRet = ::DialogBoxIndirectParam(hInstance, pTemplate, hWndParent, (DLGPROC)T::StartDialogProc, dwInitParam);

     if (nRet == -1)
     {
         DWORD dwErr = ::GetLastError();
         dwErr = 0;
     }

     return nRet;
     //return CDialogImpl<T>::DoModal(hWndParent, dwInitParam);
 }

};

Hope it'll be helpful to someone, too. Best regards,

Change dialog font at runtime

1 Answers1