Re: PerfMon

From:

"Chizl" <Chizl@NoShitMail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Wed, 20 Feb 2008 12:50:53 -0600

Message-ID:

<eO2RGG$cIHA.4332@TK2MSFTNGP04.phx.gbl>

I think I figure out this number is at a very hight dec place and is the
total since the machine started.. Anyone know how to pull the one PerfMon
shows in thier list? I'm using the exact same "data property" value that
they have.. I'm trying to figure out what the current bandwidth for both
input/output going through a specific nic.

"Chizl" <Chizl@NoShitMail.com> wrote in message
news:uGxOwi%23cIHA.5668@TK2MSFTNGP05.phx.gbl...

OS: WinXP Pro
Compiler: VC++6
SDK: Platform/latest

I have some code that uses PDH which, I've been using since '98 to access
and pull perf counters.. Recently, I pulled the code again because I
needed it for a project and I notices some of the numbers are skewed or
possibly cached.

My class has 4 methods..
1) OpenPerfMon
2) OpenPerfDialog
3) GetCounter
4) ClosePerfMon

Below is the GetCounter, but when I call:
\\\\127.0.0.1\\Network Interface(Broadcom NetXtreme 57xx Gigabit
Controller)\\Packets Received/sec

I get 12.xxxxxxx back.. I start downloading a large file and call it
again, I get the exact same number back. I opened PerfMon and put a
watch on the same counter and it moves, but when I call it from my code it
doesn't.. What am I missing?

Here is the kicker, when I call: "\\\\127.0.0.1\\Memory\\Available Bytes"
it always seems to come back with the right number and changes each time I
call it. It seems all the Network Interface calles are all coming back
with the same number, no matter what the network card is doing. Yes, I
have only 1 Network card and yes, that is the name of it.

===================================
double CPerfCounters::GetCounter(char* pstrCounter)
{
DWORD ctrType;
HRESULT hr = S_OK;
HCOUNTER *pCounterHandle;
PDH_FMT_COUNTERVALUE fmtValue;

// Allocate the counter handle array. Allocate room for
// one handle per command line arg, not including the
// executable file name.
pCounterHandle = (HCOUNTER *)GlobalAlloc(GPTR, sizeof(HCOUNTER));

pdhStatus = PdhAddCounter(hQuery, pstrCounter, 0, pCounterHandle);
if (pdhStatus != ERROR_SUCCESS)
{
throw(pdhStatus);
return -1;
}

// "Prime" counters that need two values to display a
// formatted value.
pdhStatus = PdhCollectQueryData (hQuery);
if (pdhStatus != ERROR_SUCCESS)
{
throw(pdhStatus);
return -1;
}

// Get the current value of this counter.
pdhStatus = PdhGetFormattedCounterValue (*pCounterHandle, PDH_FMT_DOUBLE,
&ctrType, &fmtValue);
if (pdhStatus != ERROR_SUCCESS)
{
throw(pdhStatus);
return -1;
}

return fmtValue.doubleValue;
}
===================================