Code Library » CListCtrl

How to get ClistCtrl item text of another process

support — Wed, 24 Sep 2008 08:19:30 +0000

Question:

In some app like WinSpy/Spy++ to make adjustments to list controls. It can correctly set an app’s list control’s modes, alignments,
sorting, styles, and extended styles. It can also get the widths of the columns and count of items.

The problem is that you cannot seem to get the columns’ names or the item text. The app uses code like this, where lc is a pointer to the target app’s list control:

lc->GetColumnWidth();
lc->GetItemCount();
lc->ModifyStyle();
lc->SetExtendedStyle();
lc->GetHeaderCtrl()->GetItemCount();

That all works fine, but when you try something like this, it doesn’t work:

TCHAR colname[256]=_T("");
LVCOLUMN lvcol;
ZeroMemory(&lvcol, sizeof(lvcol));
lvcol.mask=LVCF_TEXT;
lvcol.cchTextMax=sizeof(colname)-1;
lvcol.pszText=colname;
lc->GetColumn(col, &lvcol);

GetColumn may return TRUE or FALSE, but the LVCOLUMN structure remains unchanged. If you tried using that same code in a test app to get the name of a column from that app’s own list control and it worked. It only seems to fail when use it from a different app.

Solution:

Well, there is no surprise here; in fact, if there is any surprise, it is that you did not manage to totally crash the target app (I presume that lc is a CListCtrl::FromHandle of an HWND in another process).

Think about this case:

you are passing the address of a data structure in YOUR process as a LPARAM-sized value to some totally different process, where that LPARAM value is completely and utterly meaningless.

David Ching did a remote-sendmessage DLL some time ago. This essentially does DLL injection of the code so it is running in the target process; you can google for this by looking for SendMessageRemote.

http://www.dcsoft.com/private/sendmessageremote.cpp

Tags: CListCtrl, How-to, Injection, Process, Win32/MFC

30 Great Tips of CListCtrl Program(2)

support — Tue, 03 Jun 2008 02:35:16 +0000

30 Great Tips of CListCtrl Program(1)

8. Get Item Infomation

TCHAR szBuf[1024];
LVITEM lvi;
lvi.iItem = nItemIndex;
lvi.iSubItem = 0;
lvi.mask = LVIF_TEXT;
lvi.pszText = szBuf;
lvi.cchTextMax = 1024;
m_list.GetItem(&lvi);

More infomation: Q173242: Use Masks to Set/Get Item States in CListCtrl

9. Get the header titile of CListCtrl

LVCOLUMN lvcol;
char str[256];
int   nColNum;
CString strColumnName[MAX_COL];
nColNum = 0;
lvcol.mask = LVCF_TEXT;
lvcol.pszText = str;
lvcol.cchTextMax = 256;
while(m_list.GetColumn(nColNum, &lvcol))
{
    strColumnName[nColNum] = lvcol.pszText;
    nColNum++;
}

10. Scoll the scollbar to ensure item visible

m_list.EnsureVisible(i, FALSE);

11. Get the column count of CListCtrl

int nHeadNum = m_list.GetHeaderCtrl()->GetItemCount();

12. Delete all the columns

Method 1:

while ( m_list.DeleteColumn (0));

Once you delete the first column, the next columns will move above.

Method 2:

for (int i=nColumns-1; i>=0; i–)
m_list.DeleteColumn (i);

13. Get the row and column index of the clicked item

Method 1:

void CTestDlg::OnClickList1(NMHDR* pNMHDR, LRESULT* pResult)
{
   DWORD dwPos = GetMessagePos();
   CPoint point( LOWORD(dwPos), HIWORD(dwPos) );
   m_list.ScreenToClient(&point);
   LVHITTESTINFO lvinfo;
   lvinfo.pt = point;
   lvinfo.flags = LVHT_ABOVE;
   int nItem = m_list.SubItemHitTest(&lvinfo);
   if(nItem != -1)
   {
        CString strtemp;
        strtemp.Format(“You clicked row %d column %d”, lvinfo.iItem, lvinfo.iSubItem);
        AfxMessageBox(strtemp);
   }
}

Method 2:

void CTestDlg::OnClickList1(NMHDR* pNMHDR, LRESULT* pResult)
{
   NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
   if(pNMListView->iItem != -1)
   {
        CString strtemp;
        strtemp.Format(“You clicked row %d column %d”,
                        pNMListView->iItem, pNMListView->iSubItem);
        AfxMessageBox(strtemp);
   }
}

14. Check if you clicked on the checkbox

void CTestDlg::OnClickList1(NMHDR* pNMHDR, LRESULT* pResult)
{
   DWORD dwPos = GetMessagePos();
   CPoint point( LOWORD(dwPos), HIWORD(dwPos) );
   m_list.ScreenToClient(&point);
   LVHITTESTINFO lvinfo;
   lvinfo.pt = point;
   lvinfo.flags = LVHT_ABOVE;
   UINT nFlag;
   int nItem = m_list.HitTest(point, &nFlag);
   if(nFlag == LVHT_ONITEMSTATEICON)
   {
        AfxMessageBox(“clicked on the checkbox”);
   }
   *pResult = 0;
}

15. pop up menu when right mouse button clicked

void CTestDlg::OnRclickList1(NMHDR* pNMHDR, LRESULT* pResult)
{
    NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
    if(pNMListView->iItem != -1)
    {
        DWORD dwPos = GetMessagePos();
        CPoint point( LOWORD(dwPos), HIWORD(dwPos) );
        CMenu menu;
        VERIFY( menu.LoadMenu( IDR_MENU1 ) );
        CMenu* popup = menu.GetSubMenu(0);
        ASSERT( popup != NULL );
        popup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this );
    }
    *pResult = 0;
}

Tags: CListCtrl, Tips

30 Great Tips of CListCtrl Program(1)

support — Tue, 03 Jun 2008 01:21:22 +0000

Without a special note,the listctrl has the default view style of report.

1. CListCtrl style

LVS_ICON: for each item displayed great icon

LVS_SMALLICON: for each item displayed on the icon

LVS_LIST: a show with a small icon on the item

LVS_REPORT: Show item details

You can inspect the Windows Explorer, just like “View” tab with “icon, small icon, list details”

2. CListctrl style and expand style

LONG lStyle;
lStyle = GetWindowLong (m_list.m_hWnd, GWL_STYLE); // Get the current window style
lStyle &= ~ LVS_TYPEMASK; // Clear display
lStyle |= LVS_REPORT; // set style
SetWindowLong (m_list.m_hWnd, GWL_STYLE, lStyle); // set style
DWORD dwStyle = m_list.GetExtendedStyle ();
dwStyle |= LVS_EX_FULLROWSELECT; // highlight the selected full row
dwStyle |= LVS_EX_GRIDLINES; // grid lines (with the style of the report)
dwStyle |= LVS_EX_CHECKBOXES; // checkbox controls
m_list.SetExtendedStyle (dwStyle); // set expand style

Note: Please check MSDN for style details.

3. Insert data

m_list.InsertColumn (0, “ID”, LVCFMT_LEFT, 40); // insert column
m_list.InsertColumn (1, “NAME”, LVCFMT_LEFT, 50);
int nRow = m_list.InsertItem (0, “11 “);// Row
m_list.SetItemText (nRow, 1, “jacky “);// set of data

4. Always selected item
Check the style of Show selection always, or in the section 2 above set LVS_SHOWSELALWAYS style.

5. Check and uncheck a row

int nIndex = 0;
// Check
m_list.SetItemState (nIndex, LVIS_SELECTED | LVIS_FOCUSED, LVIS_SELECTED | LVIS_FOCUSED);
// Uncheck
m_list.SetItemState (nIndex, 0, LVIS_SELECTED | LVIS_FOCUSED);

6. Get the checkbox status of all the rows

m_list.SetExtendedStyle(LVS_EX_CHECKBOXES);
CString str;
for(int i=0; i{
   if( m_list.GetItemState(i, LVIS_SELECTED) == LVIS_SELECTED || m_list.GetCheck(i))
   {
        str.Format(_T(“checkbox checked in row %d”), i);
        AfxMessageBox(str);
   }
}

7. Get the selected row index

Method 1:

CString str;
for(int i=0; i{
    if( m_list.GetItemState(i, LVIS_SELECTED) == LVIS_SELECTED )
    {
        str.Format(_T(“ROW %d selected.”), i);
        AfxMessageBox(str);
    }
}

Method 2:

POSITION pos = m_list.GetFirstSelectedItemPosition();
if (pos == NULL)
TRACE0(“No items were selected!\n”);
else
{
    while (pos)
    {
        int nItem = m_list.GetNextSelectedItem(pos);
        TRACE1(“Item %d was selected!\n”, nItem);
        // you could do your own processing on nItem here
    }
}

Tags: CListCtrl, Tips

The Simplest way to change the row height of CListCtrl

support — Mon, 14 Jan 2008 01:41:38 +0000

In the post “How to change the row height of CListCtrl“, it gives 2 solution example how to change row height or CListCtrl. Hower, it is not the simplest way.

The simplest way to change the row height in a CListCtrl is:

Display an icon with the desired height.

All other ways that I know of require significant programming (such as owner draw, which is often too much work).

Tags: CListCtrl, Tips, Win32/MFC

How to Adding CTreeCtrl in CListCtrl

support — Sun, 06 Jan 2008 23:09:57 +0000

In some case, you need such a control as the following figure:

It’s a CListCtrl like control, but it binds a CTreeCtrl in the first column. But you can also consider it as a CTreeCtrl and each of the items has the list style.

All roads lead to Rome. But in 1999, David Lantsman has already given a solution on CodeProject and named it CTreeList: A TreeList Control.

You can Download demo project – 60 Kb and Download source files – 21 Kb from codeproject.

Tags: CListCtrl, CTreeCtrl, Win32/MFC

How do I subclass the CListCtrl part of a CListView Class?

support — Mon, 22 Oct 2007 06:49:07 +0000

Read this article:

How to use an derived CListCtrl in CListView

Tags: CListCtrl, CListView, Howto, Subclass

How to sort items of CListCtrl or CListView?

support — Mon, 22 Oct 2007 06:23:02 +0000

How to sort the items of a CListCtrl or CListView(CReportView)?

First, when you add items, you need to call SetItemData to attach an data structure(an integer or a pointer) to the item.

Then, define a callback sort function.

int CALLBACK SortFunc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort);

And here, the prarameters lParam1 and lParam2 are the data structure you set in SetItemData. With the parameters, you can get the item content and calculate the sort order. Please notice, the parameters are NOT the item index.

Last, you can reponse the message HDN_ITEMCLICK or LVN_COLUMNCLICK, and call CListCtrl::SortItems with the callback function.

The examples from the CListCtrl::SortItems in MSDN is obsolescent, you’d better refer to the KB article:

250614 HOWTO: Sort Items in a CListCtrl in Report View

Tags: CallBack, CListCtrl, CListView, How-to, SetItemData

How to use an derived CListCtrl in CListView

support — Mon, 22 Oct 2007 03:15:01 +0000

Sometime you use CListView and need to extend the functionality of the CListCtrl of the view. For example, you want to overwrite the handler function of the NM_CUSTOMDRAW or WM_SIZE message. So the problem is: How to tell CListView to use your own CListCtrl?

OK, you are on the wrong way now.

The CListView does not use or contain the MFC CListCtrl, it only wraps a subclassed SysListView32 control as a CCtrlView, in the other hand, the view is the control.

If all you’ve done in your custom CListCtrl derived class is to handle the reflected NM_CUSTOMDRAW message, your best bet to get this working as a custom CListView is to derive a class from CListView and handle the reflected message for it just as you do in your CListCtrl derived implementation.

If you want get more custom control or you have already make an extended version of CList, It may be easier to derive a view class from CView and use your own CListCtrl in the view.

There are two articles about this topic on CodeGuru:

Tags: CListCtrl, CListView, CView, Win32/MFC

How to select the item of ListView(CListCtrl)

support — Thu, 18 Oct 2007 12:07:30 +0000

Use CListCtrl::SetItemState with LVIS_SELECTED

Tags: CListCtrl, Win32/MFC

How to change the row height of CListCtrl

hamo — Wed, 06 Dec 2006 02:34:32 +0000

When you want to change the height of CListCtrl, you need to use an owner-draw version of CListCtrl and change the font of the control. But when you change the font of the CListCtrl, the control or its parent window does not get a chance to respecify the height of the rows and the effect will not be taken. The reason is that No WM_MEASUREITEM message is sent to the controls parent window.

The following article from CodeProject provided a good solution.

Changing Row Height in an owner drawn Control

And there is a similar article on CodeGuru.

Changing row height in owner drawn control

Tags: CListCtrl, Cpp, Win32/MFC