C / C++ / MFC Discussion Boards

RobJones10-Feb-06 8:54

10-Feb-06 8:54

if(a.size() > b.size())
{
....
}

if(a.size() < b.size())
{
....
}

if you are compairing the lengths.

Whoever said nothing's impossible never tried slamming a revolving door!

Re: string problem???

Maximilien10-Feb-06 9:12

Maximilien

10-Feb-06 9:12

no it will not.

R is still smaller ( or equal ) than W, whatever the length of the rest of the strings.

what are you trying to compare ? the string length ? or the lexical order ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: string problem???

Demonware66610-Feb-06 15:16

Demonware666

10-Feb-06 15:16

I once had a similiar problem so I used the strcmp function. Check out digitalmars.com for the details on dealing with strings, its a great site. Got to the runtime library part.

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Demonware Studios Leader

Interactive SQL Tool (using ODBC) question.

Blakiston10-Feb-06 7:31

Blakiston

10-Feb-06 7:31

I downloaded ISQLMFC_src.zip source code from topic "Interactive SQL Tool (using ODBC)". I used Microsoft Visual Studio .Net 2003 to build it, but I got the following error message: "error C2065: 'm_pchData' : undeclared identifier". What did I miss? Please help me out?

Thank you.

Blakiston

VB macros

skk64302n10-Feb-06 7:29

skk64302n

10-Feb-06 7:29

Hi,

I wanted to learn CommBasic language.... or any language...
where i can write macros....

I decided to learn C, C++... will this be help to me to write
macro on VB flatform.....

SKK

Error in code

zahid_ash10-Feb-06 6:50

zahid_ash

10-Feb-06 6:50

There ia an arror in the code below , but i am unable to fine some has provided me to find , Please mention it , Thanks

MS_PACKET DataPacket;
memset(&DataPacket,0,sizeof(MS_PACKET));
DataPacket.msHeader.dPacketType = ACM_MSG_SEND_PAIR_ORDER;

strcpy( DataPacket.acmSendPairOrder.m_szAccount ,
szCurrentLogin );
strcpy( DataPacket.acmSendPairOrder.m_szSymbolBuySide ,
pPair->BaseSymbol.szSymbol );
strcpy( DataPacket.acmSendPairOrder.m_szSymbolSellSide ,
pPair->DependentSymbol.szSymbol );

DataPacket.acmSendPairOrder.m_nSharesBuySide =
pPair->BaseSymbol.iNeededShares;
DataPacket.acmSendPairOrder.m_nSharesSellSide =
pPair->DependentSymbol.iNeededShares;
DataPacket.acmSendPairOrder.m_cSideBuySide = 'B';
DataPacket.acmSendPairOrder.m_cSideSellSide = 'S';
DataPacket.acmSendPairOrder.m_nPairID = pPair->nACMPairID;

static int nOrderCounter = 0;
DataPacket.acmSendPairOrder.m_nMPairOrderID = nOrderCounter++;
m_pMTLinkSocket->Send((BYTE*)&DataPacket,sizeof(MS_PACKET));

Regards.

Re: Error in code

David Crow10-Feb-06 9:24

David Crow

10-Feb-06 9:24

zahid_ash wrote:

There ia an arror in the code below

Good luck in finding it, especially since you did not indicate whether it was a compiler, linker, or runtime error.

You seem to have narrowed it down to a small section of code. Why can't you single-step through it to find which statement is in error?

"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli

Looking for solid C+Tree or C*-Tree source

Joe Woodbury10-Feb-06 6:27

Joe Woodbury

10-Feb-06 6:27

I am looking for some solid, unencumbered, source for a C+Tree or, preferably, C*Tree.

Note the words "unecumbered"--at most it must have a zlib type license, it cannot have any requirement to distribute the source; my client will simply not allow it.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Looking for solid C+Tree or C*-Tree source

Jim Crafton10-Feb-06 6:33

Jim Crafton

10-Feb-06 6:33

You mean a tree container class, something that's compatible with STL? Or a tree view control?
I was looking for tree container class myself, but didn't find much that I liked. There's one here on CP that looks quite nice, but it's LGPL so that's a no go, for me.

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Re: Looking for solid C+Tree or C*-Tree source

Joe Woodbury10-Feb-06 6:39

Joe Woodbury

10-Feb-06 6:39

Just a C+Tree with no STL (if someone has put STL on top, that's fine.) I will have to use disk (both to persist the tree and because of memory issues) so a plain C-Tree is out as is STL or MFC classes.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Looking for solid C+Tree or C*-Tree source

EXTEIDE10-Feb-06 6:40

EXTEIDE

10-Feb-06 6:40

How about looking for it in here[^]?
But I wonder whether there is a non-license component that you want.

Enjoy Rose | [Rose]

Anderson Sheen
Reduce a time to develop your environment. It's a free!
http://www.exteide.com

Re: Looking for solid C+Tree or C*-Tree source

Joe Woodbury10-Feb-06 6:47

Joe Woodbury

10-Feb-06 6:47

Uh, not to be too sarcastic, but I'm looking for C+Tree or C*Tree source code not a tree control. If you don't know the difference, don't respond.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Looking for solid C+Tree or C*-Tree source

EXTEIDE10-Feb-06 7:05

EXTEIDE

10-Feb-06 7:05

I just suggested category collection. but I didn't look for it there. Sorry, it'm my mistake.
But I think it's not good to say like you by reason that you couldn't found it in my reference.
My will was giving help to you although it was not help to you.

Anderson Sheen
Reduce a time to develop your environment. It's a free!
http://www.exteide.com

Re: Looking for solid C+Tree or C*-Tree source

Jörgen Sigvardsson10-Feb-06 12:21

Jörgen Sigvardsson

10-Feb-06 12:21

If you do find a free such implementation, which is not an integrated part of a complex system such as a DBMS, please let me know. This is the kind of stuff you normally pay big bucks for. Smile | :)

Help With VC++ SOcket Programming using MFCs

alienattack10-Feb-06 6:13

alienattack

10-Feb-06 6:13

Hello everyone,
I am a beginner in socket programming and would like anyone to suggest some basic code-one for the client and another for the server,written in VC++ using MFC's and using the CSocket class,not CAsyncSocket.,or if anyone could suggest a link where i could find some place to start off from,i'd be grateful.Thanks

Re: Help With VC++ SOcket Programming using MFCs

EXTEIDE10-Feb-06 6:24

EXTEIDE

10-Feb-06 6:24

Refer here.[^]

You'd better to search in google.
I found it with keyword of "CSocket MFC example".

Enjoy Rose | [Rose]

Anderson Sheen
Reduce a time to develop your environment. It's a free!
http://www.exteide.com

Re: Help With VC++ SOcket Programming using MFCs

ThatsAlok13-Feb-06 21:38

ThatsAlok

13-Feb-06 21:38

try this
CSocket[^]

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cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Proper way to terminate a thead?

masnu10-Feb-06 4:49

masnu

10-Feb-06 4:49

All the articles I have read state that all threads must be terminated before the main thread exits or the program will still be resident in memory.

The question then becomes, how to properly terminate all worker threads?

I have the following:

void CClient::StopThread()<br />
{<br />
	m_bRunning = false;<br />
	WaitForSingleObject(m_pThread->m_hThread, INFINITE);<br />
<br />
	delete m_pThread;<br />
}

And the worker thread is defined as:

UINT CClient::WorkerThread() <br />
{<br />
<br />
	while(m_bRunning)<br />
	{<br />
		//Do some work.....<br />
	}<br />
<br />
	AfxEndThread(0,0);<br />
//Signal here???<br />
<br />
	return 0;<br />
}

The problem is that the program hangs after I call the StopThread function. I am sure I need to signal the function that my thread has terminated but, since I am new to the MFC and multithreaded programming, I am not sure where to do that.

Any help is appreciated. Thanks.

Re: Proper way to terminate a thead?

Roger Stoltz10-Feb-06 5:24

Roger Stoltz

10-Feb-06 5:24

Never call AfxEndThread, or any similar function. It's bound create problems.

1.
What happens here is that the compiler optimizes away the m_bRunning in your thread since the value is not changed inside the while statement.
Fix this by declaring the m_bRunning variable as 'volatile'.

2.
I assume you start your thread with a call to AfxBeginThread.
If so, you should create it suspended and set the CWinThread::m_bAutoDelete to false to be able to wait for the thread to finish. Delete the CWinThread pointer that you got from AfxBeginThread in your StopThread function.
If you don't do this, a race condition will occur that may result in the thread handle you are waiting for is invalid.

Hope this helps
--
Roger

It's supposed to be hard, otherwise anybody could do it!

Re: Proper way to terminate a thead?

masnu10-Feb-06 6:42

masnu

10-Feb-06 6:42

Thanks.. I'll try that!

Re: Proper way to terminate a thead?

Stephen Hewitt11-Feb-06 0:25

Stephen Hewitt

11-Feb-06 0:25

masnu wrote:
all threads must be terminated before the main thread exits or the program will still be resident in memory

This isn't true - In fact if the "main" thread exits the process exits and any other threads that may be executing are killed on the spot. This is why when exiting the main thread typically waits for any worker threads to finish (using WaitForsingleObject or friends) before bailing: this gives the wokers a chance to clean up after themselves (for example, delete temp files).

Steve

PS: As for how to properly terminate a thread, the correct answer is ask the thread to exit and then wait for it to do so.

List of error codes

Spykraft10-Feb-06 4:04

Spykraft

10-Feb-06 4:04

Where can I get a complete list of Win32 error codes. In VC++5.0, am getting a Win32 error 3, the authors say its because of the path specified not found, searched the whole net, but still can't make out what exactly is causing this error...

Would be of great help...
Adnan

Re: List of error codes

toxcct10-Feb-06 4:08

toxcct

10-Feb-06 4:08

see GetLastError()[^] doc ans System error codes[^]...

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Re: List of error codes

Spykraft10-Feb-06 4:18

Spykraft

10-Feb-06 4:18

True, the System Error codes provide a description, but its the same generic description. Could you tell me what might be causing this runtime error? am specifying all the paths of the DLL,exe,LIB. Am i missing any other environment settings...any help on that?

Re: List of error codes

David Crow10-Feb-06 4:26

David Crow

10-Feb-06 4:26

Spykraft wrote:
Could you tell me what might be causing this runtime error?

Not without seeing the line of code in question.

Spykraft wrote:
...am specifying all the paths of the DLL,exe,LIB.

But are they the correct paths? Are they absolute or relative?

"The greatest good you can do for another is not just to share your riches but to reveal to him his own." - Benjamin Disraeli

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