C / C++ / MFC

• we have a DIALOGEX resource.
  
• the dialog has attached a menu with ID in the .rc file (not a name).
  
• a CLASS statement was inserted in .rc file, that we'll replace with a class name with the same length.
  
  
  

  #include <AFXPRIV.H>
  #include <AFXIMPL.H>
  #define DELETE_EXCEPTION(e) do { e->Delete(); } while (0)
  // ...
  int CMyDialog::DoModal() 
  {
  // ... original code ...
  
     TRY
     {
        // create modeless dialog
        AfxHookWindowCreate(this);
        ////////////////////////// INSERTED CODE //////////////////////////
        // you can register "Tata Leone" class here (see my previous example).
        DLGTEMPLATEEX* lpDlgTemplateEx = (DLGTEMPLATEEX*)lpDialogTemplate;
        WCHAR* pClassName = ((WCHAR*)lpDlgTemplateEx 
                             // skip DLGTEMPLATEEX structure
                             + sizeof(DLGTEMPLATEEX) / sizeof(WCHAR) 
                             // skip menu
                             + 2 * sizeof(WORD) / sizeof(WCHAR));
  
        wcscpy(pClassName, L"Tata Leone"); // replace "Mama Leone".
        //////////////////////// END INSERTED CODE ////////////////////////
        if (CreateDlgIndirect(lpDialogTemplate,
                CWnd::FromHandle(hWndParent), hInst))
  // ... the rest of original code ...
  }

  
  Of course "Mama Leone" is defined in resources CLASS statement, and "Tata Leone" is a registered class.
  And of course the class name can be randomly generated or using a GUID.
  
  Ovidiu Cucu
  Microsoft MVP - Visual C++
  
  -- modified at 5:41 Friday 30th June, 2006

class CMyDialog : public CDialog
{
// ...
   BOOL Create(UINT nResID, CWnd* pParent)
      { return Create(MAKEINTRESOURCE(nResID), pParent);}
   BOOL Create(LPCTSTR lpszTemplateName, CWnd* pParentWnd);
// ...
}; 

#include <AFXIMPL.H>
// ...
BOOL CMyDialog::Create(LPCTSTR lpszTemplateName, CWnd* pParentWnd)
{
   ASSERT(HIWORD(lpszTemplateName) == 0 ||
      AfxIsValidString(lpszTemplateName));
   
   m_lpszTemplateName = lpszTemplateName;  // used for help
   if (HIWORD(m_lpszTemplateName) == 0 && m_nIDHelp == 0)
      m_nIDHelp = LOWORD((DWORD)m_lpszTemplateName);
   
   HINSTANCE hInst = AfxFindResourceHandle(lpszTemplateName, RT_DIALOG);
   HRSRC hResource = ::FindResource(hInst, lpszTemplateName, RT_DIALOG);
   HGLOBAL hTemplate = LoadResource(hInst, hResource);
   
   ASSERT(hTemplate != NULL);
   
   DLGTEMPLATEEX* lpDialogTemplate = (DLGTEMPLATEEX*)LockResource(hTemplate);
   
   WCHAR* pClassName = ((WCHAR*)lpDialogTemplate 
                        // skip DLGTEMPLATEEX structure
                        + sizeof(DLGTEMPLATEEX) / sizeof(WCHAR) 
                        // skip menu
                        + 2 * sizeof(WORD) / sizeof(WCHAR));
   
   wcscpy(pClassName, L"Tata Leone"); // replace "Mama Leone".
   
   BOOL bResult = CreateIndirect((LPCDLGTEMPLATE)lpDialogTemplate, 
                                                   pParentWnd, NULL, hInst);
   UnlockResource(hTemplate);
   FreeResource(hTemplate);
   return bResult;
}

#pragma pack(push, 1)

typedef struct
{
	WORD dlgVer;
	WORD signature;
	DWORD helpID;
	DWORD exStyle;
	DWORD style;
	WORD cDlgItems;
	short x;
	short y;
	short cx;
	short cy;
} DLGTEMPLATEEX;

#pragma pack(pop)

• we have a DIALOGEX resource.
  
• the dialog has attached a menu with ID in the .rc file (not a name).
  
• a CLASS statement was inserted in .rc file, that we'll replace with a class name with the same length.
  

WCHAR* pClassName = ((WCHAR*)lpDialogTemplate
                     // skip DLGTEMPLATEEX structure
                     + sizeof(DLGTEMPLATEEX) / sizeof(WCHAR)
                     // skip menu
                     + sizeof(WORD) / sizeof(WCHAR));

 IDD_DIALOG1 DIALOGEX DISCARDABLE  0, 0, 186, 95
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Dialog"
CLASS "Mama Leone" 

pCmdUI->SetCheck(IsGrid);

pCmdUI->SetCheck(1);

Viorel. wrote:

Are you sure your OnUpdateChartoptionsGrid handler is called by MFC?

isGrid = 0;	// assume isGrid is initialized to 0

isGrid = 1 - isGrid;	// isGrid is now 1 (1 - 0)
isGrid = 1 - isGrid;	// isGrid is now 0 (1 - 1)

isGrid = 1;	// assume isGrid is initialized to 1

isGrid = 1 - isGrid;	// isGrid is now 0 (1 - 1)
isGrid = 1 - isGrid;	// isGrid is now 1 (1 - 0)