Help: How to make a DLL's window show modal in a MFC app?

Mao Zhihong -- maozhihong@hotmail.com
Friday, December 06, 1996

Environment: VC++ 1.52, VC++ 4.0 with patch, Win3.1, Win 95

Dear MFC-Acers,
  I need help! In my current project, we mixed MFC's codes with Delphi's, 
that is, we make some DLLs by Delphi, and then call them from MFC app. 
When I try to make a window(dialog) from DLL show modal, it doesn't work 
ok: the DLL's windows can not always stay on top, if I click on my app's 
main window, it will overlap the dll's dialog, but this time the main 
window is inactive. In Win 95, the DLL's window and my mainframe both 
appear in the task bar. 
  my code is like this : 
  
  ...
  extern "C" void ShowDllDialog();
  ...
  void CMyView::OnShowDialog()
  {
    ::ShowDllDialog();
    //...
  }
  ...
  
  I tried to set DLL's dialog's parent to my main window, but this time, 
both two windows refuse any input!
  I peeked the windows information by SPY++, and found it nothing differ 
from a MFC's dialog box.
  Can any body help me?

				best reguards
					Robert Mao

---

Mao Zhihong -- maozhihong@hotmail.com
Friday, December 06, 1996

Mao Zhihong wrote:
> 
> Environment: VC++ 1.52, VC++ 4.0 with patch, Win3.1, Win 95
> 
> Dear MFC-Acers,
>   I need help! In my current project, we mixed MFC's codes with Delphi's,
> that is, we make some DLLs by Delphi, and then call them from MFC app.
> When I try to make a window(dialog) from DLL show modal, it doesn't work
> ok: the DLL's windows can not always stay on top, if I click on my app's
> main window, it will overlap the dll's dialog, but this time the main
> window is inactive. In Win 95, the DLL's window and my mainframe both
> appear in the task bar.
>   my code is like this :
> 
>   ...
>   extern "C" void ShowDllDialog();
>   ...
>   void CMyView::OnShowDialog()
>   {
>     ::ShowDllDialog();
>     //...
>   }
>   ...
> 
>   I tried to set DLL's dialog's parent to my main window, but this time,
> both two windows refuse any input!
>   I peeked the windows information by SPY++, and found it nothing differ
> from a MFC's dialog box.
>   Can any body help me?
> 
>                                 best reguards
>                                         Robert Mao

Dear friends, 
  I get the answer myself, maybe it is not the best, but it do 
effective!
  firstly, we should know:
  1. if you want to make a Dialog in DLL show modal, you MUST pass a 
parent
  for it, or it can not show modal as you want! (there is a tech notes 
in 
  MSDN talk about this)
  2. When a window show modal, its parent automatically set to toplevel
  window, though you just passed a parent window handle for it!
  
  But sometimes, maybe you can not pass a handle for the DLL, how could 
u 
  do this smoothly? (that's just my problem, I still don't know how to 
  set a HWND as a TForm's parent. :( )
  ok, the following is my way, it is dirty but really work!

  /* file : mainfrm.h */
  ...
  BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWnd)
    	//{{AFX_MSG_MAP(CMainFrame)
	ON_WM_WINDOWPOSCHANGING()
	//}}AFX_MSG_MAP
  END_MESSAGE_MAP()
  ...
void CMainFrame::EnableZorder(BOOL b)
{
  m_bZorderCanChg = b;
}

void CMainFrame::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos)
{
	CFrameWnd::OnWindowPosChanging(lpwndpos);
	
	if (!m_bZorderCanChg) {
	  lpwndpos->flags |= SWP_NOZORDER; 
	}
}
  ...

  /* file : where you call up the DLL's dialog */
  ...
  extern "C" void ShowDllDialog();
   ...
   void CMyView::OnShowDialog()
   { 
     CMainFrame *pMain = (CMainFrame*)AfxGetMainWnd();
     pMain->EnableZorder(FALSE);
     ::ShowDllDialog();  // rem: here will pop a modal dialog
     pMain->EnableZorder(TRUE);
     //...
   }
   ...
  
  Hope this will be helpful for u!

			Best Reguards
				Mao Zhihong  
-- 
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
      Mao Zhihong ( Robert Mao )  DreamyRainbow Software Studio

      Voc/Fax : 86-25-5408086
      E-Mail  : maozhihong@hotmail.com  mao@seu.edu.cn
      URL     : http://seic3.seu.edu.cn/~mao
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