Problem with delete button

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Sorry for my poor English

I have created a simple project. My program load some image from my local computer and display it in a list control. I add a delete button to delete image if user choose an image in list control.

But when I choose more than 1 image, delete button is disappeared. Anybody help me?

Thanks a lot.
[Update]
Here is the way I handle event. But when I press control and choose more than 1 image, delete button is disappeared

void OnBnClickedBtnDeleteBase()
{
    // TODO: Add your control notification handler code here
     int msgboxID = MessageBox(
        L"Do you want to delete selected image?",
        L"Delete image",
        MB_ICONWARNING | MB_YESNO | MB_DEFBUTTON2);
    switch (msgboxID)
    {
        case IDYES:
            // TODO: add code
            DeleteSeletedBase();
            break;
        case IDNO:
            // TODO: add code
            break;
    }
}

[Update]

Sorry! Problem is not in the upper code.

The problem is here:

C#

if( pNMListView->uNewState & LVIS_SELECTED )
    {
        m_btnDeleteBase.EnableWindow(TRUE);
    }
    else
        m_btnDeleteBase.EnableWindow(FALSE);

So anybody can tell me, how can I choose multiple item :(. I am not very good at c++

Anhybody know about iItem variable :( is it useful? I tried but nothing happens :(

[Another update]
If you use
Collapse

C++

if( (pNMListView->uNewState & LVIS_SELECTED) || (pNMListView->uNewState & LVIS_FOCUSED))
    {
        m_btnDeleteBase.EnableWindow(TRUE);
    }

You can choose more than 1 items. But in some cases, delete button is still disable Frown | :( Anybody help me?

Posted 27-Mar-11 18:27pm

Lương Thông Đạt

Updated 30-Mar-11 20:53pm

Sergey Alexandrovich Kryukov

v6

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Sergey Alexandrovich Kryukov 28-Mar-11 0:31am

Nobody can tell you anything unless you show some relevant code.
--SA

3 solutions

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Hans Dietrich · Accepted Answer · 2011-03-27T19:20:00

Solution 1

Do you have the style LVS_SINGLESEL? If yes, then remove it to have multiple selections.

Next, use GetSelectedCount() to get the number of items selected in the list. If non-zero, loop through the selected items using GetFirstSelectedItemPosition() and GetNextSelectedItem().

Posted 27-Mar-11 19:20pm

Hans Dietrich

Comments

Lương Thông Đạt 28-Mar-11 1:25am

I already done in Delete() function and I don't have LVS_SINGLESEL.
I think when I use "pNMListView->uNewState & LVIS_SELECTED" it does not allow to choose multiple items so it run else clause. In requirement of my project, delete button is available when user choose one or more than one items.

Niklas L · Accepted Answer · 2011-03-28T00:11:00

Solution 3

C++

if (pNMListView->GetSelectedCount > 0)
{
    m_btnDeleteBase.EnableWindow(TRUE);
}

// Or simply
m_btnDeleteBase.EnableWindow(pNMListView->GetSelectedCount > 0);

I suppose the user would be confused if only the focused item was deleted. Whenever the selection state changes, check if you have any selection.

Posted 28-Mar-11 0:11am

Niklas L

Comments

Lương Thông Đạt 28-Mar-11 22:23pm

:( pNMListView is an object of NMLISTVIEW, attribute GetSelectedCount is not belong to it. Can you tell me how to make count selected item?

Niklas L 29-Mar-11 2:34am

You do have access to the CListCtrl somewhere. If it is a CListView, use CListView::GetListCtrl() as hansen described, and if it is a CListCtrl in a dialog of CFormView, just add a variable for it, or access it with GetDlgItem(IDC_MYLIST_WHATEVER).

hansen303 · Accepted Answer · 2011-03-28T19:42:00

Solution 4

The NMLISTVIEW is just a notification message structure. You want to call GetSelectedCount on the associated list control. If you're using a CListView control call CListView::GetListCtrl then call CListCtrl::GetSelectedCount on the returned object.

http://msdn.microsoft.com/en-us/library/7sdaafak(VS.80).aspx[^]

Try above link for further reference.

Posted 28-Mar-11 19:42pm

hansen303

Updated 28-Mar-11 19:54pm

v2

Comments

[no name] 29-Mar-11 1:55am

Good Link.

Lương Thông Đạt 29-Mar-11 3:23am

Thanks for your support :D I did it