public static unsafe void ReadRawValues(
this PdhCounter counter,
ArrayHolder arrayHolder,
InstancesCounter instancesCounter,
List <Sample> samples,
out int size)
{
samples.Clear();
instancesCounter.Clear();
while (true)
{
size = counter.EstimateRawCounterArraySize();
if (size == 0)
{
return;
}
var buffer = arrayHolder.Get(size);
fixed(byte *b = buffer)
{
var ptr = (PDH_RAW_COUNTER_ITEM *)b;
var status = counter.GetRawCounterArray(ref size, out var items, ptr);
if (status == PdhStatus.PDH_CSTATUS_INVALID_DATA)
{
return;
}
if (status == PdhStatus.PDH_MORE_DATA)
{
continue;
}
status.EnsureSuccess(nameof(PdhExports.PdhGetFormattedCounterArray));
if (items * sizeof(PDH_RAW_COUNTER_ITEM) > buffer.Length)
{
throw new InvalidOperationException($"Buffer overflow check failed. ItemCount: {items}, ItemSize: {sizeof(PDH_FMT_COUNTERVALUE_ITEM)}, BufferSize: {buffer.Length}");
}
for (var i = 0; i < items; ++i)
{
var current = ptr + i;
var instanceName = new string(current->Name); // TODO: avoid allocation here
samples.Add(
new Sample
{
Instance = instanceName,
Value = current->RawValue.FirstValue,
Id = instancesCounter.GetAndIncrement(instanceName)
});
}
break;
}
}
}
public static extern PdhStatus PdhCalculateCounterFromRawValue(
PdhCounter hCounter,
PdhFmt dwFormat,
ref PDH_RAW_COUNTER rawValue1,
ref PDH_RAW_COUNTER rawValue2,
out PDH_FMT_COUNTERVALUE fmtValue);
public static extern PdhStatus PdhGetRawCounterValue(
PdhCounter counter,
out int lpdwType,
out PDH_RAW_COUNTER pValue);
public static extern unsafe PdhStatus PdhGetFormattedCounterArray(
PdhCounter counter,
PdhFmt dwFormat,
ref int bufferSize,
out int itemCount,
PDH_FMT_COUNTERVALUE_ITEM *buffer);
public static extern PdhStatus PdhGetFormattedCounterValue(
PdhCounter counter,
PdhFmt dwFormat,
out int lpdwType,
out PDH_FMT_COUNTERVALUE pValue);
public static extern unsafe PdhStatus PdhGetRawCounterArray(
PdhCounter counter,
ref int bufferSize,
out int itemCount,
PDH_RAW_COUNTER_ITEM *buffer);
public static extern PdhStatus PdhAddEnglishCounter(
PdhQueryHandle query,
string path,
IntPtr userData,
out PdhCounter counter);
