Re: disappearing toolbar

From:

"Ron Francis" <rfrancis@senet.com.au>

Newsgroups:

microsoft.public.vc.language

Date:

Fri, 4 May 2007 00:02:36 +0930

Message-ID:

<uPx8lskjHHA.1388@TK2MSFTNGP05.phx.gbl>

I never use MFC and know very little about it, so I hope someone else here
can shed some light on it.
I have no idea why the pointer would be NULL.
Something must be setting it to NULL (internal workings of MFC) because what
usually happens is that some memory will be de-allocated, but the pointer
will still be pointing to that address.
If you try to use it, then your likely to get an access error.

Sorry I can't be of any help.

Regards,
Ron Francis
www.RonaldFrancis.com

"jc" <k.jayachandran@gmail.com> wrote in message
news:1178196546.097487.156670@y80g2000hsf.googlegroups.com...

Thanks Ron,

i observed something weird. i created a pointer to the toolbar and
implemented toolbar as like this

int CParentFrame::CreateAndDockToolBar(void){
DWORD dToolBarStyle;
dToolBarStyle = TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP |
CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC;
if (!m_wndToolBar.CreateEx(this, dToolBarStyle) ||
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME1)){
TRACE0("Failed to create toolbar\n");
return -1; // fail to create
}
m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
RecalcLayout(TRUE);
DockControlBar(&m_wndToolBar);
return 0;
}
int CParentFrame::OnCreate(LPCREATESTRUCT lpCS){

pMenu = new CMenu();
pMenu->LoadMenu("MAINMENU");
CreateClient(lpCS,pMenu->GetSubMenu(0));
//m_wndToolBar = new CToolBar();

if (!m_wndStatusBar.Create(this) ||!
m_wndStatusBar.SetIndicators(indicators, sizeof(indicators)/
sizeof(UINT))){
TRACE0("Failed to create status bar\n");
return -1; // fail to create
}

// TODO: Delete these three lines if you don't want the toolbar to
// be dockable

return CreateAndDockToolBar();
}

i call CreateAndDockToolBar from OnCreate function.

when the member variable m_wndToolBar is a pointer, i created a new
CToolbar and after resizing the window, the toolbar again disappeared,
and i found that
the address of the variable was NULL.
how is that possible.
also please somebody tell me, whether this is a wrong way to create
and dock a toolbar to my application

thanks

jc

On May 2, 9:00 am, "Ron Francis" <rfran...@senet.com.au> wrote:

I don't use MFC and I'm using VC++ 6, but maybe you have to handle the
WM_SIZE message.
In MFC, it would be something like an OnSize() or similar function.
You may have to manually resize and move it.

I use a Rebar that I resize every time the window is resized and the
function looks like this ...

//ghWnd is the main application's window

void MoveRebar(HWND hWnd)
{
RECT rc,rcRebar;
int x,y,cx,cy;

GetClientRect(ghWnd, &rc);
GetWindowRect(GetDlgItem(hWnd, ID_REBAR), &rcRebar);

switch(g_wSide) {
default:
case TOP:
  //align the rebar along the top of the window
  x = 0;
  y = 0;
  cx = rc.right - rc.left;
  cy = rcRebar.bottom - rcRebar.top;
  break;

case LEFT:
  //align the rebar along the left side of the window
  x = 0;
  y = 0;
  cx = rcRebar.right - rcRebar.left;
  cy = rc.bottom - rc.top;
  break;

case BOTTOM:
  //align the rebar along the bottom of the window
  x = 0;
  y = rc.bottom - ((rcRebar.bottom - rcRebar.top));
  cx = rc.right - rc.left;
  cy = rcRebar.bottom - rcRebar.top;
  break;

case RIGHT:
  //align the coolbar along the right side of the window
  x = rc.right - (rcRebar.right - rcRebar.left);
  y = 0;
  cx = rcRebar.right - rcRebar.left;
  cy = rc.bottom - rc.top;
  break;
}

MoveWindow( GetDlgItem(hWnd, ID_REBAR),
    x,
    y,
    cx,
    cy,
    TRUE);
//workaround, have to maximize last toolbar else it is right justified
SendMessage(ghRebar,RB_MAXIMIZEBAND,(WPARAM)4,(LPARAM)0);

}

I hope that this give you something to work with, or that someone working
with MFC answers your post.

Regards,
Ron Franciswww.RonaldFrancis.com

"jc" <k.jayachand...@gmail.com> wrote in message

news:1178112842.703976.201020@q75g2000hsh.googlegroups.com...

it doesn't matter "debug" or "release", i change the size of the
window toolbar disappears

thanks

jc
On May 2, 8:31 am, jc <k.jayachand...@gmail.com> wrote:

i have specific way to reproduce the problem.
it happens only in release mode.
the toolbar disappear when i change the size of the window to which it
has been attached.
like maximize, minimize or even change the size.

thanks
jc
On Apr 30, 1:36 pm, jc <k.jayachand...@gmail.com> wrote:

i created a win32 application
the parentframe is CMDIFrameWnd and it has a lot of CMDIChildWnd
attached to it.
i also create a toolbar resource and docked it to the main frame.
when i open the application(in release mode),
minimize or maximize or even restore, tool bar disappears. even if
try
to open a file(using CFileDialog class)
toolbar disappears.
can somebody explain why it happens and how to prevent it from
happening again

it is VC++ project created in Visual Studio 2005 or VC8

thanks
jc