C / C++ / MFC

25-Sep-03 7:19

I have a CListCtrl that I'm attempting to add items to. I have followed what it says to do for inserting items in the Using the List Control article by Matt Weagle: http://www.codeproject.com/listctrl/listctrldemo.asp?target=clistctrl%7Creport%7Cview%7Cinsert

I have created 2 columns that I'm attempting to add items to. The first row that I insert does go in the correct place, but when I insert the second row, the item in the first column gets entered into row 0 and the contents of the current row 0 get shifted down to row 1. This wouldn't be a huge problem for me, except that that I enter into the second column, doesn't get inserted into row 0, but goes into row 1, overwriting the current value in row 1. Here's my code so far, if anyone notices any mistakes, please let me know!

CString tempstr, strItem;
CStdioFile browseFile;
LVITEM lvi;
int numRead = browseFile.Read(readBuffer, fileLength);
....
int rowNumber = 0;
//read in/set z and concentration values in CListCtrl, use InsertItem
for (counter = 0; counter < numRead; counter++)
{
tempstr = "";
while((readBuffer[counter] != ' ') && (readBuffer[counter] != '\n') && (counter < numRead))
{
tempstr += readBuffer[counter];
counter++;
}
if(readBuffer[counter] == ' ')
{
//if a space, tempstr is for the first column
lvi.mask = LVIF_TEXT;
strItem.Format(_T(tempstr));
lvi.iItem = rowNumber;
lvi.iSubItem = 0;
lvi.pszText = (LPTSTR)(LPCTSTR)(strItem);
m_elementList.InsertItem(&lvi);
}
else if(readBuffer[counter] == '\n')
{
//if a newline, tempstr is for the second column
strItem.Format(_T(tempstr));
lvi.iSubItem = 1;
lvi.pszText = (LPTSTR)(LPCTSTR)(strItem);
m_elementList.SetItem(&lvi);
//increase the row number
rowNumber++;
}
else if(counter >= numRead)
{
//if the last element in the file, tempstr is for the second column
strItem.Format(_T(tempstr));
lvi.iSubItem = 1;
lvi.pszText = (LPTSTR)(LPCTSTR)(strItem);
m_elementList.SetItem(&lvi);
}
}

Michael Dunn25-Sep-03 7:32

Michael Dunn

25-Sep-03 7:32

Always init your structs to 0:

LVITEM lvi = {0};

--Mike--
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b_girl25-Sep-03 7:39

25-Sep-03 7:39

It still doesn't work.

My column names are: Z and Concentration

What I want is either:
Z Concentration OR Z Concentration
12 3.4 100 12.04
100 12.04 12 3.4

But, what I'm getting is:
Z Concentration
12 3.4

followed by:
Z Concentration
100
12 12.04

I print out the row numbers in using AfxMessageBox before inserting each item, and the row numbers appear to be correct, but things are still getting added in the wrong place.

vcplusplus25-Sep-03 7:39

vcplusplus

25-Sep-03 7:39

Check your list control properties. If you have "Sort" equal to "ascending" or "descending," the final position is not necessarily the one where you inserted your text.

Check the value of InsertItem() after inserting the text;

LVITEM lvi = {0};
..
..
..
INT nRow;
// Column 0
nRow = m_elementList.InsertItem(&lvi); // Column 0

// Column 1
lvi.iItem = nRow;
strItem.Format(_T(tempstr));
lvi.iSubItem = 1;
lvi.pszText = (LPTSTR)(LPCTSTR)(strItem);
m_elementList.SetItem(&lvi);

b_girl25-Sep-03 7:55

25-Sep-03 7:55

Thanks. that fixed it. I didn't realize that there was a sorting option on the thing.

b_girl25-Sep-03 8:34

25-Sep-03 8:34

Is it possible to allow the user to edit the contents of the second column and NOT the first column?

Also, when a user selects an item in my CListCtrl, how to I get it to highlight the entire row, and not just the item in the first column?

Bringing an application to the top

Ravi Bhavnani25-Sep-03 8:38

Ravi Bhavnani

25-Sep-03 8:38

b_girl wrote:
how to I get it to highlight the entire row

Use the extended style LVS_EX_FULLROWSELECT.

/ravi

Let's put "civil" back in "civilization"
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Cache draw output

Mathias S.25-Sep-03 6:55

Mathias S.

25-Sep-03 6:55

I got a own draw controller. And I takes this controller 0.5sec to redraw because it does a lot of stuff and this is okay.

But I wonder if I can speed up some thing. If I move an application over my program, a lot of redraws are done. And since every redraw take 0.5sec it flicker a little too much. So I wonder if there are anyway to cache the last draw result and use that if nothing in my program has changed.

Since I'm using a MemDC in my program I think I should be able to cache a copy of it and use it. But how do I do that.

/Mathias

Re: Cache draw output

JWood25-Sep-03 8:08

JWood

25-Sep-03 8:08

If the draw functions are taking too long you can create a boolean that keeps track of if anything has been actually changed in your CMemDC. This is somewhat tedious as you must set it to true for every change made, but then include it in OnDraw(CDC* pDC). You must also use a more sophisticated version of CMemDC from the destructor into a function like CMemDC::Rredraw(), include CMemDC in your CView as a member (do not destroy it, with every OnDraw or OnPaint). You must also update it in OnSize()

J.
----------------------------

Re: Cache draw output

JWood25-Sep-03 8:14

JWood

25-Sep-03 8:14

Buffer DC

J.
----------------------------

MarcoNedwig25-Sep-03 6:37

MarcoNedwig

25-Sep-03 6:37

I would like to press a button in an mfc application and bring another application to the top. I searched the documentation and found commands like SetForegroundWindow() and ActivateWindow(), but I only made it that the application blinks in the task bar (Win 2000). Can anyone tell me a solution of this problem. It must be working with VC6/VC7(2003) on Win 2000 and NT 4.

Neville Franks25-Sep-03 7:38

Neville Franks

25-Sep-03 7:38

Clicking a button in your app will give it focus, so you need to do this after the button up message. BringWindowToTop() should do the trick.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

igor196025-Sep-03 8:37

igor1960

25-Sep-03 8:37

Starting with Win2000, MSFT desided to restrict ability of not active application to become active (to fight those IE popups).
I'll recommend looking into AllowSetForegroundWindow to understand invented concept.
However, there are several workarounds that can do the trick -- It's not allowed to post them here, but if you email me I'll share them with you...

Regards

"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me

Bo Hunter25-Sep-03 10:12

Bo Hunter

25-Sep-03 10:12

Why are you not allowed to post them here?

Thank You
Bo Hunter

igor196025-Sep-03 10:30

igor1960

25-Sep-03 10:30

Why are you not allowed to post them here?

Because, by doing that I'll be directly undermining MSFTs security efforts and eventually may get into trouble.
In my opinion, this site is directly or indirectly financed by MSFT: why would I post materials undermining MSFTs security efforts on MSFT site?
Poke tongue | ;-P

Regards

"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me