Display a MFC Modal Dialog with CListBox in TestStand

Question

I want to display a MFC Modal Dialog with a CListBox element, but I can't fill the listbox with data.
Here are some commands of my program:
SequenceContext seqContext;
Engine engine;
seqContext.AttachDispatch(seqContextDisp, FALSE);
engine.AttachDispatch(seqContext.GetEngine());
HWND parentHwnd = (HWND)engine.GetAppMainHwnd();
CSearch_Line_Window_Dialog dlg(CWnd::FromHandle(parentHwnd));
dlg.m_SearchLineWindow_Listbox.m_hWnd = parentHwnd;
(without this command I get the error "Debug Assertion Failed", because of ASSERT(::IsWindow(m_hWnd)))
dlg.m_SearchLineWindow_Listbox.AddString("Hallo");
dlg.DoModal();
seqContext = NULL;
engine = NULL;
The dialog with the emtpy listbox appears, b
ut without any text. I tried the same by using NotifyStartOfModalDialogEx and NotifyEndOfModalDialog. The example "MFC_Modal_Dialog" opens only a dialog without elements.
I hope you can help me to solve my problem.
Thank you.

Answer 1

I've about the same problem and tried to implement your solution but can't get it to run. I always receive an assertion failure.
I try to fill the ComboBox in a dialog with items at runtime. (use VC++ and MFC-DLL)
the header of my dialog:
class DlgSelectECU : public CDialog
public:
DlgSelectECU(CWnd* pParent = NULL);
BOOL OnInitDialog();
//{{AFX_DATA(DlgSelectECU)
enum { IDD = IDD_DLGSELECTECU_DIALOG };
CComboBox m_ECUList;
CStringList m_StringList;
//}}AFX_DATA
//{{AFX_VIRTUAL(DlgSelectECU)
protected:
virtual void DoDataExchange(CDataExchange*pDX);
//}}AFX_VIRTUAL
protected:
DECLARE_MESSAGE_MAP()
the implementation of my dialog:
DlgSelectECU:lgSelectECU(CWnd* pParent /*=NULL*/)
: CDialog(DlgSelec
tECU::IDD, pParent)
//{{AFX_DATA_INIT(DlgSelectECU)
//}}AFX_DATA_INIT
BOOL DlgSelectECU:nInitDialog()
POSITION pos = m_StringList.GetHeadPosition();
while (pos)
m_ECUList.AddString(m_StringList.GetNext(pos));
return true;
void DlgSelectECU:oDataExchange(CDataExchange* pDX)
CDialog:oDataExchange(pDX);
//{{AFX_DATA_MAP(DlgSelectECU)
DDX_Control(pDX, IDC_COMBO_ECU, m_ECUList);
//}}AFX_DATA_MAP
my dll function TestStand calls looks like that:
EXPORT CALLBACK SelectECU(char ECUs[1024])
AFX_MANAGE_STATE(AfxGetStaticModuleState());
DlgSelectECU Dlg;
Dlg.m_StringList.AddTail("ITEM 1");
if (Dlg.DoModal() == IDOK)
// do something
Running the sequence file in TestStand and calling the dll function descriped above causes an assertion failure each time I try to add anything to the StringList. Why? And what am I doing wrong? Is there
a documentation about how to write dlls with MFC elements
for use with TestStand using other tools than LabWindows/CVI? Everything I found so far is rather crude.
Thanks!