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Solved
LIstbox Question -> adding items after Initialization
Posted on 2004-04-07
Hi,
How can I add something to a listbox, AFTER it's initialized?
First, I use this code:
BOOL CDialog1::OnInitDialog()
{
CDialog::OnInitDialog();
m_ListBox.AddString("jef")
return true ;
}
and this works fine. But I want to be able to add other items afterwards (to be precise, I would like to be able to show the user which webcams are available.)
So I made a function:
void CCamDialog::AddListBox()
{
m_CamList->AddString("came
}
But this gives an error (debg assertion failed).
any ideas?
thanks
Tim Magnus
How can I add something to a listbox, AFTER it's initialized?
First, I use this code:
BOOL CDialog1::OnInitDialog()
{
CDialog::OnInitDialog();
m_ListBox.AddString("jef")
return true ;
}
and this works fine. But I want to be able to add other items afterwards (to be precise, I would like to be able to show the user which webcams are available.)
So I made a function:
void CCamDialog::AddListBox()
{
m_CamList->AddString("came
}
But this gives an error (debg assertion failed).
any ideas?
thanks
Tim Magnus
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11 Comments
What is m_CamList?
If this is a pointer to list box
Plz do this in your OnInitDialog
m_CamList = (CListBox*)GetDlgItem(IDC_
//IDC_LIST1 is the id for your list box
else if it is added through class wizard as a control member
m_CamList.AddString("camer
-Lakshman
If this is a pointer to list box
Plz do this in your OnInitDialog
m_CamList = (CListBox*)GetDlgItem(IDC_
//IDC_LIST1 is the id for your list box
else if it is added through class wizard as a control member
m_CamList.AddString("camer
-Lakshman
Sorry for that, Guess I copied it wrong (I was trying to make it work in an other application)
It should be
BOOL CDialog1::OnInitDialog()
{
CDialog::OnInitDialog();
m_ListBox.AddString("jef")
return true ;
}
and
void CDialog1::AddListBox()
{
m_ListBox.AddString("camer
}
It should be
BOOL CDialog1::OnInitDialog()
{
CDialog::OnInitDialog();
m_ListBox.AddString("jef")
return true ;
}
and
void CDialog1::AddListBox()
{
m_ListBox.AddString("camer
}
If you added m_ListBox member through the class wizard as control variable the code in OnInitDialog() should work fine.
If you are calling AddListBox() after dialog initialization that also should work fine.
I hope you are not calling this method in OnCreate method or Constructor.
-Lakshman
If you are calling AddListBox() after dialog initialization that also should work fine.
I hope you are not calling this method in OnCreate method or Constructor.
-Lakshman
Active 4 days ago
How is the AddListBox called? After your dialog is visible?
There is nothing wrong with your code as such, it should work.
However if you are trying something like
CDialog1 dlg(this);
dlg.AddListBox();
dlg.DoModal();
then it will fail as your listbox doesn't exist at the time you call the AddListBox.
In an instance like this you would need to add the strings to an array in CDialog1 and the list box is filled with the contents of the array in the OnInitDialog fn.
There is nothing wrong with your code as such, it should work.
However if you are trying something like
CDialog1 dlg(this);
dlg.AddListBox();
dlg.DoModal();
then it will fail as your listbox doesn't exist at the time you call the AddListBox.
In an instance like this you would need to add the strings to an array in CDialog1 and the list box is filled with the contents of the array in the OnInitDialog fn.
Addlistbox was indeed being called like this:
void CDialogTestApp::OnTest1()
{
CDialog1 d1;
d1.AddString();
d1.DoModal();
}
(with ontest1 being an eventhandler when i press a menuitem)
But how should I do it then? Should I make an extra constructor which receives an array, and passes it on OnInitDialog?
thanks for your help btw! It's very much appreciated...
void CDialogTestApp::OnTest1()
{
CDialog1 d1;
d1.AddString();
d1.DoModal();
}
(with ontest1 being an eventhandler when i press a menuitem)
But how should I do it then? Should I make an extra constructor which receives an array, and passes it on OnInitDialog?
thanks for your help btw! It's very much appreciated...
Active 4 days ago
Where do the choices come from? In CDialogTestApp or CDialog1?
If they come from CDialog1 then do everything internally there.
A general method would be
in CDialog1 have a public member variable of type CStringArray m_arszListBoxContents;
void CDialogTestApp::OnTest1()
{
CDialog1 d1;
d1.m_arszListBoxContents.A
d1.m_arszListBoxContents.A
d1.DoModal();
}
then in the OnInitDialog of CDialog1 loop throught the contents of the array and add them as you did before to the listbox
If they come from CDialog1 then do everything internally there.
A general method would be
in CDialog1 have a public member variable of type CStringArray m_arszListBoxContents;
void CDialogTestApp::OnTest1()
{
CDialog1 d1;
d1.m_arszListBoxContents.A
d1.m_arszListBoxContents.A
d1.DoModal();
}
then in the OnInitDialog of CDialog1 loop throught the contents of the array and add them as you did before to the listbox
They should put an edit button on this forum
it's called like this obviously:
void CDialogTestApp::OnTest1()
{
CDialog1 d1;
d1.AddListBox(); // AddLIstbox instead of Addstring of course
d1.DoModal();
}
it's called like this obviously:
void CDialogTestApp::OnTest1()
{
CDialog1 d1;
d1.AddListBox(); // AddLIstbox instead of Addstring of course
d1.DoModal();
}
Yes, that should do the trick I think. (why couldn't I come up with that)
Thank you very very much!
When I become a very talented and Professional programmer, I hope I can help you out once too ;-)
Tim Magnus
Thank you very very much!
When I become a very talented and Professional programmer, I hope I can help you out once too ;-)
Tim Magnus
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