Access Violation with CXTPControlComboBox

 

I am using CXTControlComboBox in my toolbar.

 

First, I declare it as CXTControlComboBox m_skins in MainFrame.h.

And in MainFrame.cpp, I add the strings to this combobox in the following way:

 

int CMainFrame::OnCreateControl(LPCREATECONTROLSTRUCT lpCreateControl)
{
 if (lpCreateControl->nID == ID_MY_TOOL_SKIN)
 {
  m_skins.SetWidth(60);
  m_skins.SetDropDownListStyle(TRUE);
  m_skins.AddString(_T("Skin1"));
  m_skins.AddString(_T("Skin2"));

  lpCreateControl->pControl = &m_skins;
  return TRUE;
 }
 return FALSE;
}

 

I got Access Violation when I exit the application, when it came to destructor of CMainFrame.

 

Then I looked through the examples and find out that I should use a pointer, like this:

 

in MainFrame.h

CXTControlComboBox* m_skins;

 

in MainFrame.cpp

int CMainFrame::OnCreateControl(LPCREATECONTROLSTRUCT lpCreateControl)
{
 if (lpCreateControl->nID == ID_MY_TOOL_SKIN)
 {
  m_skins = (CXTPControlComboBox*)CXTPControlComboBox::CreateObject();
  m_skins->AddString(_T("Skin1"));
  m_skins->AddString(_T("Skin2"));
  m_skins->SetDropDownWidth(150);
  lpCreateControl->pControl = m_skins;
  return TRUE;
 }
 return FALSE;
}

 

Could someone explain for me why?

 

Thanks for your help

 

But the code (member variable not using pointer) worked fine with VS2003 and XtremeToolkid Pro 9.8. Why is that?