graph controls not sizable dynamically?

[mps]

I am trying to size my graph controls in the OnInitDialog method, but the application crashes?
It crashes in the PositionAndSizeGraphs method on this line, graphPtr->GetWindowRect(&graphRect);

Does anyone know why? The code works fine in VC++ 6.0.


BOOL CDistribution::OnInitDialog()
{
CDialog::OnInitDialog();
PositionAndSizeGraphs();

return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}
void CDistribution::PositionAndSizeGraphs()
{
RECT graphRect;
RECT histogramRect;

CNiGraph* graphPtr=(CNiGraph*) GetDlgItem(IDC_PRJECTION_GRAPH);
graphPtr->GetWindowRect(&graphRect);

CNiGraph* histogramPtr=(CNiGraph*) GetDlgItem(IDC_HISTOGRAM);
histogramPtr->GetWindowRect(&histogramRect);

int top,bottom,left,right;

top=histogramRect.top;
bottom=histogramRect.bottom;
left=graphRect.left;
right=graphRect.right;


graphRect.right=graphRect.left+ (graphRect.bottom-graphRect.top);

ScreenToClient(&graphRect);
graphPtr->MoveWindow(&graphRect,TRUE);

}

[drohacek]

Have you declared CNiGraph instances and associated them with the actual HWNDs for IDC_PRJECTION_GRAPH and IDC_HISTOGRAM with DDX_Control calls? You would typically declare the CNiGraph instances as member variables of CDistribution and put the DDX_Control calls in CDistribution::DoDataExchange.

Message Edited by drohacek on 06-25-2005 04:38 PM

[mps]

Yes, I have tried it that way and I get the same error message. In OnInitDialog these two objects or pointers -- depending on how you code it -- do not have HWND handles.

Message Edited by mps on 06-25-2005 07:31 PM

[drohacek]

When I step through my code, my CNiGraph instance is associated with the control HWND in the call to DDX_Control:

DDX_Control(pDX, IDC_CWGRAPH1, m_graph);

Do you have DDX_Control calls for IDC_PRJECTION_GRAPH and IDC_HISTOGRAM? If so, are the HWNDs within the CNiGraph instances invalid after the DDX_Control calls? Could you attach a small project that I can use to reproduce this behavior?

[mps]

Are you compiling your code in the .NET environment?

[drohacek]

Yes. Visual Studio .NET 2003.