C / C++ / MFC

int CDialog::DoModal()
{
	// can be constructed with a resource template or InitModalIndirect
	ASSERT(m_lpszTemplateName != NULL || m_hDialogTemplate != NULL ||
		m_lpDialogTemplate != NULL);

	// load resource as necessary
	LPCDLGTEMPLATE lpDialogTemplate = m_lpDialogTemplate;
	HGLOBAL hDialogTemplate = m_hDialogTemplate;
	HINSTANCE hInst = AfxGetResourceHandle();
	if (m_lpszTemplateName != NULL)
	{
		hInst = AfxFindResourceHandle(m_lpszTemplateName, RT_DIALOG);
		HRSRC hResource = ::FindResource(hInst, m_lpszTemplateName, RT_DIALOG);
		hDialogTemplate = LoadResource(hInst, hResource);
	}
	if (hDialogTemplate != NULL)
		lpDialogTemplate = (LPCDLGTEMPLATE)LockResource(hDialogTemplate);

	// return -1 in case of failure to load the dialog template resource
	if (lpDialogTemplate == NULL)
		return -1;

	// disable parent (before creating dialog)
	HWND hWndParent = PreModal();
	AfxUnhookWindowCreate();
	BOOL bEnableParent = FALSE;
	if (hWndParent != NULL && ::IsWindowEnabled(hWndParent))
	{
		::EnableWindow(hWndParent, FALSE);
		bEnableParent = TRUE;
	}

	TRY
	{
		// create modeless dialog
		AfxHookWindowCreate(this);
		if (CreateDlgIndirect(lpDialogTemplate,
						CWnd::FromHandle(hWndParent), hInst))
		{
			if (m_nFlags & WF_CONTINUEMODAL)
			{
				// enter modal loop
				DWORD dwFlags = MLF_SHOWONIDLE;
				if (GetStyle() & DS_NOIDLEMSG)
					dwFlags |= MLF_NOIDLEMSG;
				VERIFY(RunModalLoop(dwFlags) == m_nModalResult);
			}

			// hide the window before enabling the parent, etc.
			if (m_hWnd != NULL)
				SetWindowPos(NULL, 0, 0, 0, 0, SWP_HIDEWINDOW|
					SWP_NOSIZE|SWP_NOMOVE|SWP_NOACTIVATE|SWP_NOZORDER);
		}
	}
	CATCH_ALL(e)
	{
		DELETE_EXCEPTION(e);
		m_nModalResult = -1;
	}
	END_CATCH_ALL

	if (bEnableParent)
		::EnableWindow(hWndParent, TRUE);
	if (hWndParent != NULL && ::GetActiveWindow() == m_hWnd)
		::SetActiveWindow(hWndParent);

	// destroy modal window
	DestroyWindow();
	PostModal();

	// unlock/free resources as necessary
	if (m_lpszTemplateName != NULL || m_hDialogTemplate != NULL)
		UnlockResource(hDialogTemplate);
	if (m_lpszTemplateName != NULL)
		FreeResource(hDialogTemplate);

	return m_nModalResult;
}

// destroy modal window<br />
	DestroyWindow();<br />