C / C++ / MFC Discussion Boards

khb16-Jul-06 22:11

16-Jul-06 22:11

Hi together,

I'd like to determine the number of cores a CPU has using a C++ program. I found a solution at http://www.intel.com on how to do it for Intel CPUs. But I didn't find out how to do it for AMD CPUs (i.e., Athlon X2). Moreover, the Intel solution states that it might give wrong results for CPUs with a certain stepping if it's not compiled on that CPU type Frown | :(

Therefore I'd like to ask if anybody has a robust solution for counting the cores of Intel and AMD CPUs. Thank you for any ideas in advance!

Regards,
Marcus.

Re: How do I count CPU cores?

David Crow17-Jul-06 2:59

David Crow

17-Jul-06 2:59

Use the Win32_Processor class.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

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

Re: How do I count CPU cores?

khb17-Jul-06 23:00

khb

17-Jul-06 23:00

Hi David,

thank you for the hint. I managed to access the Win32_Processor members. However, the members NumberOfCores and NumberOfLogicalProcessors are not valid. To get them MSDN suggests to use Win32_ComputerSystemProcessor. This class contains a reference to Win32_Processor which should contain the data I'm looking for.

Now my question: How do I follow the reference from Win32_ComputerSystemProcessor to Win32_Processor in C++? In the first run I used ExecQuery() to select Win32_Processor and accessed its data using Next() and Get(). Now I guess I have to use ExecQuery() to select Win32_ComputerSystemProcessor, but how do I continue?

Thank you for any help you can give!

Regards,
Marcus.

Re: How do I count CPU cores?

David Crow18-Jul-06 2:33

David Crow

18-Jul-06 2:33

khb wrote:
I managed to access the Win32_Processor members. However, the members NumberOfCores and NumberOfLogicalProcessors are not valid. To get them MSDN suggests to use Win32_ComputerSystemProcessor. This class contains a reference to Win32_Processor which should contain the data I'm looking for.

This makes no sense. If the members of Win32_Processor are not valid, why would you then state that they should contain the data you're looking for?

khb wrote:
However, the members NumberOfCores and NumberOfLogicalProcessors are not valid.

How are you verifying this?

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

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

Re: How do I count CPU cores?

khb18-Jul-06 6:01

khb

18-Jul-06 6:01

DavidCrow wrote:
This makes no sense. If the members of Win32_Processor are not valid, why would you then state that they should contain the data you're looking for?

Maybe I understood wrong what MSDN says. I just read: "To determine the total number of processor instances associated with a computer system object, use the Win32_ComputerSystemProcessor association class."

DavidCrow wrote:
How are you verifying this?

Maybe I'm doing something wrong. I compiled the code with VC6 on my single core P4 with HT enabled (Win XP). I also run the program on a dual core Pentium D with HT enabled (also Win XP). In both cases NumberOfCores was not found and NumberOfLogicalProcessors was 0. I guess that the code works, as I can retrieve other members like, e.g., Name correctly. However, I can post the code if you like.

Regards,
Marcus.

Re: How do I count CPU cores?

David Crow18-Jul-06 6:50

David Crow

18-Jul-06 6:50

khb wrote:
In both cases NumberOfCores was not found and NumberOfLogicalProcessors was 0.

These were added for Vista.

http://www.microsoft.com/technet/scriptcenter/topics/vista/wmi1.mspx[^]

http://windowssdk.msdn.microsoft.com/en-us/library/ms738352.aspx[^]

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

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

Re: How do I count CPU cores?

khb18-Jul-06 8:19

khb

18-Jul-06 8:19

DavidCrow wrote:
These were added for Vista.

Whoops, I somehow missed that Blush | :O

Well, this brings me right back to my initial question: Is there any chance to get the processor specs on non-Vista systems?

Regards,
Marcus.

Re: How do I count CPU cores?

David Crow18-Jul-06 8:20

David Crow

18-Jul-06 8:20

khb wrote:
Is there any chance to get the processor specs on non-Vista systems?

Yes, I've done it with both Win32_ComputerSystem and Win32_Processor.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

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

Re: How do I count CPU cores?

khb18-Jul-06 21:09

khb

18-Jul-06 21:09

Now I'm getting confused Wink | ;)

I just tried Win32_ComputerSystem. For example, I can get NumberOfProcessors correctly. But I can't get NumberOfLogicalProcessors, it's not in the query result. But this is alright according to MSDN which says about NumberOfLogicalProcessors:

Windows Server 2003, Windows XP, Windows 2000, Windows NT 4.0, and Windows Me/98/95: This property is not available.

Then I tried Win32_Processor. For example, I can get Name correctly. But I get neither NumberOfLogicalProcessors nor NumberOfCores, they're both not in the query result. But again this is alright, because MSDN states for both properties what I already cited above.

Or did I get something completely wrong?

Thank you for your patience, David!

Regards,
Marcus.

Re: How do I count CPU cores?

Mike O'Neill19-Jul-06 15:48

Mike O'Neill

19-Jul-06 15:48

::GetSystemInfo (which is available all the way back to Win95) will get you the number of processors. http://msdn.microsoft.com/library/en-us/sysinfo/base/getsysteminfo.asp[^]

I don't know how it would interpret a hyper-threaded machine. For that you might try the cpuid instruction, which is available as a compiler intrinsic as __cpuid (see http://msdn2.microsoft.com/en-us/library/hskdteyh.aspx[^])

Mike

Re: How do I count CPU cores? [modified]

khb19-Jul-06 22:47

khb

19-Jul-06 22:47

Hi Mike,

thanks for your answer. Currently I'm using the code from the article Counting Physical and Logical Processors here on CP. It makes also use of the functions you mentioned. I split up the code on did some tests on the following 2 PCs (I was wrong before: Pentium D has no HT):

1) Pentium 4, 3.06GHz, Single core, HT
2) Pentium D 950, 3.40GHz, Dual core, No HT

I'd like to calculate the following values:

1) # CPUs: 1, #Cores: 1, #Log. CPUs per Core: 2
2) # CPUs: 1, #Cores: 2, #Log. CPUs per Core: 1

Now the problem: The functions you mentioned return the following values for both(!) CPUs:

GetSystemInfo.dwNumberOfProcessors: 2
cpuid HTT bit: Set
cpuid # logical CPUs per physical CPU: 2

This shows that it's not possible to distinguish between HT and dual core Cry | :((

Regards,
Marcus.

Catching events from a dynamically loaded html in CHtmlView [modified]

georgekjolly16-Jul-06 21:25

georgekjolly

16-Jul-06 21:25

Hi all,

I am doing a project in VC++. In that I am loading html pages
dynamically using CHtmlView Class. And I need to catch all the events happening in the html page NOT IN the web browser control.

Is it possible or Not

Please help me.
Thanks in advance

George K Jolly

-- modified at 5:36 Monday 17th July, 2006

Re: Catching events from a dynamically loaded html in CHtmlView

Abhi Lahare16-Jul-06 22:50

Abhi Lahare

16-Jul-06 22:50

Look for WebBrowser Customization article in MSDN. or
see http://www.codeproject.com/miscctrl/wbp.asp?df=100&forumid=1947&exp=0&select=236984[^]

Regards
Abhishake Lahare

GUIDGen.exe utility

Anu_Bala16-Jul-06 21:06

Anu_Bala

16-Jul-06 21:06

Hi,
I studied in my project tutorial that each OPC server is identified by a unique clsid.To get this clsid,run GUIDGen.exe and get the clsid.
I do the same...i got different type of clsid.
As iam new to coding..I dont know..
why they use clsid in the coding?
Whats the use of this clsid?
What is GUID?
Is there any tutorial to study about this?
Help me

Re: GUIDGen.exe utility

Sarath C16-Jul-06 21:41

Sarath C

16-Jul-06 21:41

A CLSID is a globally unique identifier that identifies a COM class object. If your server or container allows linking to its embedded objects, you need to register a CLSID for each supported class of objects.

See More From MSDN[^]

There are some articles for a beginner in COM at CP itself

See Micheal Dunn's article Introduction to COM[^]
He has also written some other articles regarding COM and WTL.

Search in CP

SaRath.

"Where I am from, there is no plan B. So, take advantage of today becuase tomorrow is not promised. - 50 Cent"

My Blog | Understanding State Patte

Re: GUIDGen.exe utility

Parthi_Appu16-Jul-06 21:44

Parthi_Appu

16-Jul-06 21:44

this looks very basic, from this you can start knowing GUID
What is GIUD?[^]

Do your Duty and Don't expect the Result

SCardTransmit problem

black falcon16-Jul-06 21:01

black falcon

16-Jul-06 21:01

I'm trying to write a little test app to communicate with a smart card (using a GempPC Twin reader). program runs successfully until SCardTransmit function (SCardEstablishContext, SCardListReaders and SCardConnect functions return SCARD_S_SUCCESS and my card handle is 0xEA010000). this function returns 14 and does not execute.
this value is not in the "Smart Card Return Values" list in the msdn and therefor i do not have any idea for solve this problem. plealse helpe me.
my source code:
CString strReaderName ;
DWORD dwResult ;
DWORD dwReaderNameLen ;
DWORD dwProtocol;
LPSTR szListReaders = NULL;
LPTSTR szSCReader = NULL;
BYTE ATR[30] ;
DWORD ATRLen,dwState ;
byte command[] = { 0x80, 0xA4, 0x00, 0x00, 0x02, 0xFF, 0x02 };
BYTE pbRecvBuffer[500] ;
DWORD pcbRecvLength ;

dwResult=SCardEstablishContext(SCARD_SCOPE_SYSTEM,NULL,NULL,&m_hContext) ;
if(dwResult!=SCARD_S_SUCCESS)
{
AnalizeResult(dwResult);// selects a value from "Smart Card Return Values"
return ;
}
dwResult=SCardListReaders(m_hContext,NULL,NULL,&dwReaderNameLen);
if(dwResult != SCARD_S_SUCCESS)
{
AnalizeResult(dwResult);// selects a value from "Smart Card Return Values"
return;
}
szListReaders = (char*) malloc(dwReaderNameLen);
dwResult = SCardListReaders(m_hContext,NULL,(LPTSTR)szListReaders,&dwReaderNameLen);
if (dwResult != SCARD_S_SUCCESS)
{
AnalizeResult(dwResult);// selects a value from "Smart Card Return Values"
return;
}
szSCReader = (LPTSTR) szListReaders;
if(!szSCReader || *(szSCReader) =='\0')
{
if(szListReaders) free(szListReaders);
dwResult = SCardReleaseContext(m_hContext);
MessageBox("No readers present!");
return;
}
dwResult=SCardConnect(m_hContext,szSCReader,SCARD_SHARE_SHARED,SCARD_PROTOCOL_T0,&m_hCard,&dwProtocol) ;
if(dwResult!=SCARD_S_SUCCESS)
{
AnalizeResult(dwResult); // selects a value from "Smart Card Return Values"
return ;
}
dwResult=SCardStatus(m_hCard,(LPTSTR)szListReaders,&dwReaderNameLen,&dwState,&dwProtocol,ATR,&ATRLen) ;
if(dwResult!=SCARD_S_SUCCESS)
{
AnalizeResult(dwResult); // selects a value from "Smart Card Return Values"
return ;
}
MessageBox(szSCReader) ;
switch ( dwState )
{
case SCARD_ABSENT:
MessageBox("Card absent.");
break;
case SCARD_PRESENT:
MessageBox("Card present.");
break;
case SCARD_SWALLOWED:
MessageBox("Card swallowed.");
break;
case SCARD_POWERED:
MessageBox("Card has power.");
break;
case SCARD_NEGOTIABLE:
MessageBox("Card reset and waiting PTS negotiation.");
break;
case SCARD_SPECIFIC:
MessageBox("Card has specific communication protocols set.");
break;
default:
MessageBox("Unknown or unexpected card state.");
break;
}
dwResult=SCardTransmit(m_hCard,SCARD_PCI_T0,command,7,&pioRecvPci,pbRecvBuffer,&pcbRecvLength) ;
if(dwResult!=SCARD_S_SUCCESS)
{
AnalizeResult(dwResult); // selects a value from "Smart Card Return Values"
return ;
}

Re: SCardTransmit problem

Maxwell Chen16-Jul-06 23:27

Maxwell Chen

16-Jul-06 23:27

I use a SCARD_IO_REQUEST structure, this way has been working fine for many year ...

SCARD_IO_REQUEST        pio;

if(enScProt_T0 == m_ActiveProtocol)
{   pio.dwProtocol = SCARD_PROTOCOL_T0; }
else if(enScProt_T1 == m_ActiveProtocol)
{   pio.dwProtocol = SCARD_PROTOCOL_T1; }

pio.cbPciLength = sizeof(SCARD_IO_REQUEST);

m_lErrCode = SCardTransmit(m_hScConnect, &pio, pBufTx, LenTx, &pio, pBufRx, &LenRx);
if(SCARD_S_SUCCESS != m_lErrCode) {
    CString sT;
    sT.Format("Error SCardTransmit (0x%08X). ", m_lErrCode);
    m_pDlg->PutMsg(sT, true);
    return false;
}

Maxwell Chen

ERROR???

mimimimilaw16-Jul-06 20:15

mimimimilaw

16-Jul-06 20:15

LOGFONT lf;
memset(&lf, 0, sizeof(lf));
wcscpy(lf.lfFaceName, _T("Lucida Sans Unicode"));

error: cannot comvert parameter 1 from 'char32' to 'wchar_t*'

how can I solve it?

Re: ERROR???

Naveen16-Jul-06 20:24

Naveen

16-Jul-06 20:24

try this

_tcscpy(lf.lfFaceName, _T("Lucida Sans Unicode"));

nave

Re: ERROR???

Parthi_Appu16-Jul-06 20:27

Parthi_Appu

16-Jul-06 20:27

LOGFONT.lfFaceName is declared as TCHAR. TCHAR will work according to your application that is, i think you don't have _UNICODE defined in your application.
If so TCHAR will act as char, wcscpy will expecting WCHAR but you passing char. normal strcpy(..) or _tcscpy(..)
Try this... hope it'll work...

Do your Duty and Don't expect the Result

Re: ERROR???

Hamid_RT16-Jul-06 20:37

Hamid_RT

16-Jul-06 20:37

See strcpy(m_lf.lfFaceName, "Times New Roman");for your answer
------------
and see maybe its some helpful to you

<br />
	LOGFONT			m_lf;<br />
	NONCLIENTMETRICS nm;<br />
	nm.cbSize = sizeof (NONCLIENTMETRICS);<br />
	ZeroMemory ((PVOID) &m_lf,sizeof (LOGFONT));<br />
<br />
	SystemParametersInfo(SPI_GETNONCLIENTMETRICS,nm.cbSize,&nm,0); <br />
		m_lf =  nm.lfMenuFont;<br />

whitesky

m_tooltip.Create(this)

ashish dogra16-Jul-06 20:13

ashish dogra

16-Jul-06 20:13

i use this code for creating tooltip what i dont get that
tell me what is the problem
m_tooltip.Create(this);//, TTS_ALWAYSTIP);

m_tooltip.Activate(TRUE);

m_tooltip.AddTool(GetDlgItem(IDC_EDIT1),("this is edit box"),NULL,0);

m_tooltip.SetToolRect(GetDlgItem(IDC_EDIT1),1,CRect(32,32,64,64));

Ashish Dogra
MCA
Noida

Re: m_tooltip.Create(this)

Hamid_RT16-Jul-06 20:31

Hamid_RT

16-Jul-06 20:31

You dont need to a new thread we can see your thread and see my previous thread

whitesky

Re: m_tooltip.Create(this)

ashish dogra16-Jul-06 21:12

ashish dogra

16-Jul-06 21:12

i read msdn but still i dont get tootip

Ashish Dogra
MCA
Noida

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