C / C++ / MFC

Need Help with ListCtrl with LOTS of Rows

8-Mar-07 8:04

I see you have a solution cool! Smile | :)

I just meant the SetMapMode and LPtoDP stuff.
Seems to me simply doing something like this would work -

CMainFrame *pFrame = (CMainFrame*)AfxGetMainWnd();

CRect rc;
pFrame->GetWindowRect (&rc);

pFrame->MoveWindow (rc.left, rc.top, 200, 100);

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

Jethro638-Mar-07 4:46

Jethro63

8-Mar-07 4:46

Greetings:

I have this CListCtrl in a dialog and it has the potential to have to display 10's of thousands of records. Originally, I created all the rows and populated ALL of the text items but this took a prohibitively long time.

I had thought that it was the text preparation part of the process that was taking so long, so I tried just creating the columns and ALL of the rows I needed but not filling the rows in until the user scrolled. I would then fill in only the rows that came into view. My assumption was incorrect as I discovered that what was taking a great deal of the time was just creating all of the empty rows.

What is the usual approach to handling this? The main requirement that I have is that the vertical scroll bar on the list control still reflect the actual number of records that I have.

Thanks in advance!
Mark

led mike8-Mar-07 6:42

Re: Need Help with ListCtrl with LOTS of Rows [modified]

8-Mar-07 6:42

Jethro63 wrote:
What is the usual approach to handling this?

It depends on the individual. Some people give up and post a question on a forum like Code Project. Others read the documentation[^] and locate the solution.

led mike

Jethro638-Mar-07 8:10

Jethro63

8-Mar-07 8:10

What? All of the documentation from end to end? I searched MSDN under the following search keys:

CListCtrl, rows, many
CListCtrl, items, many
List, rows, many
List, items, many
List, huge
List, rows, lots
List, big

and lots more - came up with nothing. Had I known to look for the string "Virtual List", I would have but why would I? There's nothing in the word "Virtual" that would lead me to think it would handle many items. It would never have occurred to me to include the word "Virtual" in any of my searches.

I wrote to another forum and got a very simple, one line response: "Check out Virtual List". As I am sure that you are a very busy man, can you not see the logic in writing this significantly shorter, more useful, and less sarcastic response?

Thank you,
Mark

-- modified at 14:16 Thursday 8th March, 2007

Mark Salsbery8-Mar-07 8:55

8-Mar-07 8:55

I am constantly amazed (on this site) that so many people are trying to write Windows software
that have never read (or don't know of the existence of) any of the Platform SDK.

When I use a control I always at least check here: Individual Control Information[^]

There's an overview section for pretty much every control which contains probably everything one
needs to know to start using the control. So for a listview control, a quick look finds this:
List-View Controls Overview[^]. There's alot of info there, including a
solution to your original question Smile | :)

These links are to info in the online documentation but IMO every Windows programmer should
download the Platform SDK and use the documentation occasionally. Then with two clicks, one can
navigate to User Interface | Windows Controls and find a plethora of information.

I hope this helps a bit for the future (if not you then maybe someone else reading).

Cheers!
Mark

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

led mike8-Mar-07 9:09

8-Mar-07 9:09

Mark Salsbery wrote:
I am constantly amazed (on this site) that so many people are trying to write Windows software
that have never read (or don't know of the existence of) any of the Platform SDK.

Fish Filet eaters that whine [high-pitched-voice] oh I can't just drag and drop that like in VB while biting into my Fish Filet?[/high-pitched-voice] L O S E R S

led mike

Mark Salsbery8-Mar-07 9:20

8-Mar-07 9:20

And sarcasm is nothing....I've seen people called "stupid" for their questions here LMAO!

I'll just never get it....Windows is complex - I can't imagine ever completing a task without
consulting the docs. Maybe some people have it all memorized...I'm not one of 'em Smile | :)

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

led mike8-Mar-07 9:11

8-Mar-07 9:11

Jethro63 wrote:
What? All of the documentation from end to end?

Right because the ListView Overview page doesn't talk about "virtual mode" Roll eyes | :rolleyes:

The way I see it you have two choices:

#1 Get serious and become a software developer
#2 Whine about reading documentation

led mike

David Crow8-Mar-07 9:48

David Crow

8-Mar-07 9:48

Jethro63 wrote:
I wrote to another forum and got a very simple, one line response: "Check out Virtual List".

Which you then had to turn around and search for. Mike did you a favor by providing you with a link. It all falls under the "Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime." adage. You've been taught...

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

led mike8-Mar-07 9:55

8-Mar-07 9:55

DavidCrow wrote:
It all falls under the "Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime." adage.

No doubt you have seen the "Fish Filet" comments taken from my modernization of that old adage:

Some fishermen are great swimmers, others should always wear a life vest while some should just stay on land and get their Fish Filet at McDonalds.

led mike

Mark Salsbery8-Mar-07 10:08

8-Mar-07 10:08

There's the quote! I had lost it, thanks! Smile | :)

"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")

ATL server session state keeping between two different web services?

Jörgen Sigvardsson8-Mar-07 10:51

Jörgen Sigvardsson

8-Mar-07 10:51

I bet the OP will start searching msdn and google more extensively before posting here, from now on... Big Grin | :-D

falsevapor8-Mar-07 4:00

falsevapor

8-Mar-07 4:00

Sorry for repost from ATL section but that seems slow.
Ok. I think I want to create two web services in the same ATL server dll. But I want them to be able to work on the same session. Using ISessionStateService, ISession and attributed ATL ISAPI.
I got "session state keeping" to work for the same web service. But how to make the second one to be able to find the session and retrieve variable stored by the first?
Help!
Thanks a lot!
Maksim.

"personal world record"

global dynamic array.

priyank_ldce8-Mar-07 3:41

priyank_ldce

8-Mar-07 3:41

Hi all,

I am making one win32 application using VC++.NET. I have one global array of char defined as char * picArray; And it is initialized in one of the function of application picArray = new char[Height*Width]; But when I am trying to use this array in another function I am not getting data values. Can I know what is the solution for this?

Thanks in advance,
Priyank.

Like2Byte8-Mar-07 3:47

Like2Byte

8-Mar-07 3:47

Have you tried the Scope Resolution Operator '::'?

Cedric Moonen8-Mar-07 3:52

Cedric Moonen

8-Mar-07 3:52

priyank_ldce wrote:
But when I am trying to use this array in another function I am not getting data values

If you don't fill the array with values, it's logical that you cannot get data value.

Can you explain exactly what you are doing, what the problem is and what you expect ?

Cédric Moonen
Software developer

Charting control [v1.1]

prasad_som8-Mar-07 3:57

prasad_som

8-Mar-07 3:57

priyank_ldce wrote:
picArray = new char[Height*Width];

Are you its assigned value somewhere in your application, bfore using it ?

Prasad
Notifier using ATL | Operator new[],delete[][^]

Database exception try/catch block

vibindia8-Mar-07 5:10

vibindia

8-Mar-07 5:10

hi
Is ur another function where u r getting the value is defined in same file ,where u are declaring the char *picArray as global.

The more globas u use,will create more problem when the application grows big.
So pls make try to avoid it

VIBIN

"Fool's run away,where angle's fear to tread"

Like2Byte8-Mar-07 3:31

Like2Byte

8-Mar-07 3:31

Hi, I'm fixing someone's code and I came across this:

<br />
BOOL CDatapointSet::Open(UINT nOpenType, LPCTSTR lpszSql, DWORD dwOptions) <br />
{<br />
	// TODO: Add your specialized code here and/or call the base class<br />
	BOOL rtn;<br />
	TRY<br />
	{<br />
		rtn = CRecordset::Open(nOpenType, lpszSql, dwOptions);<br />
	}<br />
	CATCH(CException, e)<br />
	{<br />
		m_DB2 = true;<br />
		m_nFields = 30;<br />
		rtn = CRecordset::Open(nOpenType, lpszSql, dwOptions);<br />
	}<br />
	END_CATCH<br />
	return rtn;<br />
}<br />

Now, I'm thinking it's a candidate for theDailyWTF; but, I'm not all that familiar with writing database apps as I'm more of an embedded kind of guy.

Is this normal?

Re: Database exception try/catch block

David Crow8-Mar-07 4:20

David Crow

8-Mar-07 4:20

What does familiarity with database apps have to do with it? Assigning values to m_DB2 and m_nFields has no bearing on CRecordset::Open()'s ability to open a record set.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: Database exception try/catch block

Like2Byte8-Mar-07 4:26

Like2Byte

8-Mar-07 4:26

This is what I'm screaming! Poke tongue | ;-P

That and the fact that the OP(rogrammer) code throws an exception when the first Open is encountered. (The table it's looking for does NOT exist.

Then, in the CATCH block the OP does the exact same thing that caused the exception in the first place without changing a thing.

Like I said, a candidate for theDailyWTF.

I didn't think I was off-base by much. Thanks for your post. Smile | :)

Re: Database exception try/catch block

Mark Salsbery8-Mar-07 6:19