private void AddCounters(IEnumerable <string> validPaths)
{
uint resultCode = (uint)PdhResults.PDH_CSTATUS_VALID_DATA;
foreach (string validPath in validPaths)
{
IntPtr counterPointer;
resultCode = Apis.PdhAddCounter(this._safeQueryHandle, validPath, IntPtr.Zero, out counterPointer);
if (resultCode == PdhResults.PDH_CSTATUS_VALID_DATA)
{
CounterHandleNInstance instance = new CounterHandleNInstance()
{
CounterHandle = counterPointer, InstanceName = null
};
PDH_COUNTER_PATH_ELEMENTS pCounterPathElements = PdhHelper.ParsePath(validPath);
if (pCounterPathElements.InstanceName != null)
{
instance.InstanceName = pCounterPathElements.InstanceName.ToLower(CultureInfo.InvariantCulture);
}
if (!this._consumerPathToHandleAndInstanceMap.ContainsKey(validPath.ToLower(CultureInfo.InvariantCulture)))
{
this._consumerPathToHandleAndInstanceMap.Add(validPath.ToLower(CultureInfo.InvariantCulture), instance);
}
}
}
}
public PerformanceCounterSampleSet ReadNextSet()
{
this._firstRead.Wait();
long fileTimeStamp = 0;
uint returnCode = this._isPreVista ? Apis.PdhCollectQueryData(this._safeQueryHandle)
: Apis.PdhCollectQueryDataWithTime(this._safeQueryHandle, ref fileTimeStamp);
if (this._isLastSampleBad)
{
return(null);
}
if (returnCode != PdhResults.PDH_CSTATUS_VALID_DATA)
{
//this makes sure next call to ReadNextSet doesn't examine the data, and just returns null
this._isLastSampleBad = true;
return(null);
}
DateTime now = (_isPreVista || returnCode == PdhResults.PDH_NO_DATA) ? DateTime.Now :
new DateTime(DateTime.FromFileTimeUtc(fileTimeStamp).Ticks, DateTimeKind.Local);
PerformanceCounterSample[] counterSamples = new PerformanceCounterSample[this._consumerPathToHandleAndInstanceMap.Count];
int samplesRead = 0;
foreach (string key in this._consumerPathToHandleAndInstanceMap.Keys)
{
IntPtr counterHandle = this._consumerPathToHandleAndInstanceMap[key].CounterHandle;
CounterInfo info = PdhHelper.GetCounterInfo(counterHandle);
var sample = GetRawCounterSample(counterHandle, key, info, now);
var performanceSample = sample.PerformanceCounterSample ?? GetFormattedCounterSample(counterHandle, key, info, sample.RawCounter);
if (!this._ignoreBadStatusCodes && (performanceSample.Status != 0))
{
throw BuildException(performanceSample.Status);
}
if (performanceSample.Status != 0)
{
_log.Info(() => string.Format("Status {0:x} ignored for counter {1}", performanceSample.Status, key));
continue;
}
counterSamples[samplesRead++] = performanceSample;
}
this._isLastSampleBad = false;
//in the event we skipped bad data
if (samplesRead < counterSamples.Length)
{
Array.Resize(ref counterSamples, samplesRead);
}
return(new PerformanceCounterSampleSet(this._isPreVista ? counterSamples[samplesRead].Timestamp : now, counterSamples));
}
public static string TranslateLocalCounterPath(string englishPath)
{
PDH_COUNTER_PATH_ELEMENTS counterPathElements = PdhHelper.ParsePath(englishPath);
string counterName = counterPathElements.CounterName.ToLower(CultureInfo.InvariantCulture),
objectName = counterPathElements.ObjectName.ToLower(CultureInfo.InvariantCulture);
string[] counterNames = (string[])Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Perflib\009").GetValue("Counter");
int counterIndex = -1, objectIndex = -1;
for (int i = 1; i < counterNames.Length; i++)
{
string currentCounter = counterNames[i];
if (currentCounter.ToLower(CultureInfo.InvariantCulture) == counterName)
{
counterIndex = Convert.ToInt32(counterNames[i - 1], CultureInfo.InvariantCulture);
if ((counterIndex != -1) && (objectIndex != -1))
{
break;
}
continue;
}
if (currentCounter.ToLower(CultureInfo.InvariantCulture) == objectName)
{
objectIndex = Convert.ToInt32(counterNames[i - 1], CultureInfo.InvariantCulture);
}
if ((counterIndex != -1) && (objectIndex != -1))
{
break;
}
}
counterPathElements.ObjectName = PdhHelper.LookupPerfNameByIndex(counterPathElements.MachineName, (uint)objectIndex);
counterPathElements.CounterName = PdhHelper.LookupPerfNameByIndex(counterPathElements.MachineName, (uint)counterIndex);
return(PdhHelper.MakePath(counterPathElements, false));
}
private string[] ExpandWildCardPath(string path)
{
IntPtr pathListLength = new IntPtr(0);
uint resultCode = Apis.PdhExpandWildCardPathH(this._safeDataSourceHandle, path, IntPtr.Zero, ref pathListLength, PdhWildcardPathFlags.None);
if (resultCode == PdhResults.PDH_MORE_DATA)
{
IntPtr expandedPathList = Marshal.AllocHGlobal(pathListLength.ToInt32() * 2);
try
{
resultCode = Apis.PdhExpandWildCardPathH(this._safeDataSourceHandle, path, expandedPathList, ref pathListLength, PdhWildcardPathFlags.None);
if (resultCode == PdhResults.PDH_CSTATUS_VALID_DATA)
{
return(PdhHelper.ParsePdhMultiStringBuffer(ref expandedPathList, pathListLength.ToInt32()));
}
}
finally
{
Marshal.FreeHGlobal(expandedPathList);
}
}
return(null);
}
private IEnumerable<PerformanceCounterSampleSet> ProcessGetCounter(IEnumerable<string> counters, TimeSpan sampleInterval, int maxSamples, CancellationToken token)
{
using (PdhHelper helper = new PdhHelper(this._computerNames, counters, this._ignoreBadStatusCodes))
{
int samplesRead = 0;
do
{
PerformanceCounterSampleSet set = helper.ReadNextSet();
if (null != set)
{
yield return set;
}
samplesRead++;
}
while (((maxSamples == INFINITIY) || (samplesRead < maxSamples)) && !token.WaitHandle.WaitOne(sampleInterval, true));
}
}
