C / C++ / MFC Discussion Boards

C^hris L^osinger31-Aug-02 7:12

31-Aug-02 7:12

Georg Haan wrote:
In my neverending struggle to eliminate all overhead, I recently chose to do without the default libraries in my application

the linker is smart enough to only pull functions that it actually needs to build your app. you can link to every .LIB on your system yet your EXE will still only contain what it needs.

-c

For men use, if they have an evil turn, to write it in marble:
and whoso doth us a good turn we write it in dust.
-- Sir Thomas More

image effects!

Deleteing items from ListBox (SPEED problem)

Hadi Rezaee31-Aug-02 5:29

Hadi Rezaee

31-Aug-02 5:29

Hi there,
Is there any BETTER way to empty a lisbox ?

I used of this code:

while( m_List.GetCount() )
m_List.DeleteString( m_List.GetCount() - 1 );

Almost, I added 30,000 strings to the lisbox, and this code works LOW !
And I just NEED SPEEED Big Grin | :-D

Please help me !

Regards,

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Re: Deleteing items from ListBox (SPEED problem)

BlackSmith31-Aug-02 5:44

BlackSmith

31-Aug-02 5:44

CListBox::ResetContent().

--BlackSmith--
/*The roof is on fire, we don't need no water, let the MF burn*/. BHG.

Re: Deleteing items from ListBox (SPEED problem)

Dominik Reichl31-Aug-02 5:51

Dominik Reichl

31-Aug-02 5:51

Have a look at this article:

http://codeguru.earthweb.com/listview/VirtualListControl.html[^]

Virtual listboxes are REALLY fast!

Big Grin | :-D

Dominik

netstat

Kuniva31-Aug-02 4:42

Kuniva

31-Aug-02 4:42

How do i list connections in my program like Netstat does?

Kuniva
--------------------------------------------

Re: netstat

Georg Haan31-Aug-02 5:28

Georg Haan

31-Aug-02 5:28

Try this(NT only!):
SysInternals OpenSource Tcpview http://www.sysinternals.com/ntw2k/source/tcpview.shtml

Georg Haan (.NL)

Re: netstat

Masaaki Onishi31-Aug-02 6:23

Masaaki Onishi

31-Aug-02 6:23

Hello, the codegurus around the world.;)

Accroding as Network Programming for Microsoft Windows, P548,

The NETSTAT.EXE utility displays the TCP connection table, the UDP listener
table, and the IPv4 ptorocol statistics on your computer. The function used
to retrieve this information work with Windows NT 4.0 (SP 4 and later),
Windows 98, and Windows Me.

So, check the following functions.

DWORD GetTcpTable (
   PMIB_TCPTABLE pTcpTable,
   PDWORD pdwSize,
   BOOL bOrder
);

typedef struct _MIB_TCPTABLE
{
   DWORD dwNumEntries;
   MIB_TCPROW table[ANY_SIZE];
} MIB_TCPTABLE, *PMIB_TCPTABLE;

typedef struct _MIB_TCPROW
{
   DWORD dwState;
   DWORD dwLocalAddr;
   DWORD dwLocalPort;
   DWORD dwRemoteAddr;
   DWORD dwRemoteProt;
} MIB_TCPROW, *PMIB_TCPROW;

DWORD GetUdpTable (...), typedef struct _MIB_UDPTALBE, 
typedef stuct _MIB_UDPROW, DWORD GetIpStatistics(...)
typedef struct _MIB_IPSTATS...

Good Luck. Rose | [Rose]

Please, don't send me your email about your questions directly.
Have a nice day!
Sonork - 100.10571:vcdeveloper Wink | ;)

-Masaaki Onishi-

Debug Hangggs

Paul Silvernail31-Aug-02 3:33

Paul Silvernail

31-Aug-02 3:33

How do you determine where a safe break point is?

When I placed a break point at this line of code, my computer had a brain cramp and I had to reboot.

void CTPclassDlg::OnAdd()
{
CString sTmp; // break point on this line
// other code here ...
}

can someone explain?

Thanks

Re: Debug Hangggs

Gary R. Wheeler31-Aug-02 4:41

Gary R. Wheeler

31-Aug-02 4:41

Taking a guess, something higher up in the call tree has corrupted the stack. If you had to reboot, does this mean you're developing on Windows 98/ME? When debugging under Windows 2000/XP, you usually don't have to reboot just because of an application error like this.

Gary R. Wheeler

Re: Debug Hangggs

Paul Silvernail31-Aug-02 4:52

Paul Silvernail

31-Aug-02 4:52

Hi Gary,

Yes I am using ME.

If I move the break point down a couple lines to where I declare an int, the debug works fine. I was wondering if it had something to do with the CString. But then again, the program execution should stop befor the line is executed.

Simply moving the breakpoint would have nothing to do with corrupting the stack. Right ?? Confused | :confused:

Re: Debug Hangggs

Gary R. Wheeler31-Aug-02 14:21

Gary R. Wheeler

31-Aug-02 14:21

Hmmm. When I have odd behavior like this with the debugger, I usually try and do a 'rebuild all'. If the source code and the object code are out of sync, the line you think you've placed the breakpoint on in the source does not necessarily match the place in the object code where the breakpoint instruction is inserted. This can cause all sorts of unusual behavior.

Gary R. Wheeler

Re: Debug Hangggs

Navier1-Sep-02 12:47

Navier

1-Sep-02 12:47

Sometimes even this doesn't work. I've just had a really bizarre one where stepping over 'xor ecx, ecx' in the disassembly of 'char u[10] = "1";' caused an access violation. Access Violation on a register????? Maybe I'm missing something but that's not supposed to happen as far as I know. I ended up having to re-create the .dsw from scratch. Dropping the same source in and setting the same proj options (as far as I know) made it work just fine.

Strange but true.

==========================
i1.2sqrt(u).bcos(ur)sec(c)
but
b4.isqrt(u).ru/16

Navier
==========================

Re: Debug Hangggs

Navier1-Sep-02 12:58

Navier

1-Sep-02 12:58

Just found out what *my* problem was. I had a watch set on one of my vars: 'what.size()'. Removing this makes everything work just fine. Maybe a bug in the VC6 debugger(?) Something for you to try anyway....

==========================
i1.2sqrt(u).bcos(ur)sec(c)
but
b4.isqrt(u).ru/16

Navier
==========================

Re: Bubble sort algorithm

Vagif Abilov31-Aug-02 3:10

Vagif Abilov

31-Aug-02 3:10

Well, since this is probably the simplest sort algorithm, you should be able to figure it out. Otherwise, look here[^]

Vagif Abilov
MCP (Visual C++)
Oslo, Norway

If you're in a war, instead of throwing a hand grenade at the enemy, throw one of those small pumpkins. Maybe it'll make everyone think how stupid war is, and while they are thinking, you can throw a real grenade at them.
Jack Handey, Deep Thoughts

Error in DAO

SamirSood31-Aug-02 1:52

SamirSood

31-Aug-02 1:52

There is a probelm regarding the compaction of database. I have a database in ms-access on which i have performed some operations programatically. But When i try to compact the database using the compact database utility It is giving me errors such as "Record(s) can't be read; no read permission on <name>" error 3112 . Can anyone suggest some solution for it. I will be grateful .

Samir Sood

form, Internet Explorer protocols

Kuniva31-Aug-02 1:34

Kuniva

31-Aug-02 1:34

Hi,
I would like to know what happens exactly when you post a form in internet explorer. I mean, i know that internet connects to a server to retrieve webpage data and to send other data but i'd like to know what it does when you post a form. Does it make another connection? How is the data of a form sent, is this a protocol? If anyone knows a place where i might learn this, please let me know. Smile | :)

(the purpose is so my application can send submit forms through a direct tcp connection instead of having to insert an IE active-x control or something)

Thanks

Kuniva
--------------------------------------------

Re: form, Internet Explorer protocols

Stephane Rodriguez.31-Aug-02 4:55

Stephane Rodriguez.

31-Aug-02 4:55

You've got here the complete reference for the HTTP protocol, including the POST command.

In short, when you send form data, the body of your request contains pairs of value. Example, you have a login form with two edit boxes : login + password.
When the user clicks submit, IE sends something like this :

POST http://www.mysite.com HTTP 1.1<eol>
Connection: Keep-alive<eol>
Size: 30<eol>
<eol>
login=maunder&password=grumplf<eol>

And I swallow a small raisin.

CArray problem

Zayax31-Aug-02 1:10

Zayax

31-Aug-02 1:10

How am I suppose to declare CArray in my CDoc header file?
I've try doing like this

CArray < CPoint, CPoint > m_ptArray;

but it didn't work. The example in MSDN (COLLECT) also declare it like this. Anyone knows what 's happening?. Thanks

Newbies

Re: CArray problem

Vagif Abilov31-Aug-02 2:40

Vagif Abilov

31-Aug-02 2:40

Saying it didn't work it not enough when you request technical help. Did compiler complain? Did program crash? Try providing better diagnostic.

And of course, make sure you include MFC collection classes header (I think it's afxcoll.h).

Vagif Abilov
MCP (Visual C++)
Oslo, Norway

If you're in a war, instead of throwing a hand grenade at the enemy, throw one of those small pumpkins. Maybe it'll make everyone think how stupid war is, and while they are thinking, you can throw a real grenade at them.
Jack Handey, Deep Thoughts

Re: CArray problem

31-Aug-02 2:40

You did
#include <afxtempl.h>
?

Re: CArray problem

Zayax31-Aug-02 4:44

Zayax

31-Aug-02 4:44

I've tried to include both

#include <afxcoll.h>
#include <afxtempl.h>

in the stdafx.h but still it didn't work. The error message was

error C2143: syntax error : missing ';' before '<'
error C2501: 'CArray' : missing storage-class or type specifiers
error C2059: syntax error : '<'
error C2238: unexpected token(s) preceding ';'

Thanks. Anyone with any idea?? Confused | :confused:

Newbies

Re: CArray problem

Vagif Abilov31-Aug-02 6:59

Vagif Abilov

31-Aug-02 6:59

I still believe there's something wrong around these headers, but since you have a sample that works (from MSDN), why don't you compare line by line stdafx.h in both projects. Programming is determenistic activity, so you should be able to find what's different.

Vagif Abilov
MCP (Visual C++)
Oslo, Norway

If you're in a war, instead of throwing a hand grenade at the enemy, throw one of those small pumpkins. Maybe it'll make everyone think how stupid war is, and while they are thinking, you can throw a real grenade at them.
Jack Handey, Deep Thoughts

Re: CArray problem

Christian Graus31-Aug-02 13:59

Christian Graus

31-Aug-02 13:59

CArray is crap. Use vector.

I presume someone else has told you how to fix it, the problem is I suspect to do with how you need to decare it, with the second parameter. But the core problem is, as I said, that CArray is garbage and should not be used.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002

Re: NULL hWnd for controls in dialog box

BlackSmith31-Aug-02 5:48

BlackSmith

31-Aug-02 5:48

Your question is an absolute blur Unsure | :~

. Rephrase it or send your source and I'll help ya.

--BlackSmith--
/*The roof is on fire, we don't need no water, let the MF burn*/. BHG.

Re: NULL hWnd for controls in dialog box

valikac31-Aug-02 6:23

valikac

31-Aug-02 6:23

Initialize the combobox with an item.

Kuphryn

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