protected override bool ReleaseHandle()
{
return(PdhApi.PdhRemoveCounter(handle) == 0);
}
protected override bool ReleaseHandle()
{
return(PdhApi.PdhCloseLog(handle, PdhApi.PDH_FLAGS_CLOSE_QUERY) == 0);
}
protected override bool ReleaseHandle()
{
return(PdhApi.PdhCloseQuery(handle) == 0);
}
/// <summary>
/// gets specified performance counter from the first instance of the WMI class Gpu
/// </summary>
/// <param name="strCounterName">Name of a Gpu counter</param>
public void getGpuCounter(string strCounterName)
{
try
{
string className = "Gpu";
string strGpuCounter = "";
// Performs WMI object query in selected namespace
string wmiScope = target + nvWmiNamespace;
ManagementScope scope = new ManagementScope(wmiScope);
WqlObjectQuery wqlQuery = new WqlObjectQuery("select * from " + className);
scope.Connect();
ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, wqlQuery, null);
ManagementClass classInstance = new ManagementClass(target + nvWmiNamespace, className, null);
foreach (ManagementObject gpu in searcher.Get())
{
// printing out some properties
gpu.Get(); // bind WMI object to an instance of the .NET ManagementObject
uint id = (uint)gpu["id"]; // GPU ID
uint nvapiId = (uint)gpu["nvapiId"]; // GPU NVAPI ID
string name = (string)gpu["name"]; // GPU name
strGpuCounter = string.Format(@"\NVIDIA GPU(#{0:d} {1} (id={2:d}, NVAPI ID={3:d}))\{4}", id - 1, name, id, nvapiId, strCounterName);
break; // bail out with the perf counter for the 1st GPU in a system
}
PdhQueryHandle query;
PdhCounterHandle counter;
// result is PDH_STATUS in C++
UInt32 result = PdhApi.PdhOpenQuery(null, IntPtr.Zero, out query);
if (result != 0)
{
Console.WriteLine("error opening performance query, status={0:d} (0x{0:X8})", result);
return;
}
// Add the counter that we want to see
// The PdhEnumXXX methods can be used to discover them
result = PdhApi.PdhAddCounter(query, strGpuCounter, IntPtr.Zero, out counter);
if (result != 0)
{
// 0xC0000BCD (PDH_ENTRY_NOT_IN_LOG_FILE) means the counter was not found in the set,
// happens when counter name is mistyped or non-localized string used in localized OS
Console.WriteLine("error adding counter, status={0:d} (0x{0:X8})", result);
return;
}
do
{
result = PdhApi.PdhCollectQueryData(query);
if (result == 0)
{
PDH_FMT_COUNTERVALUE value;
result = PdhApi.PdhGetFormattedCounterValue(counter, PdhFormat.PDH_FMT_DOUBLE, IntPtr.Zero, out value);
if (value.CStatus == 0)
{
Console.WriteLine("temperature = {0:g}", value.doubleValue);
}
else
{
// 0xC0000BC6 (PDH_INVALID_DATA) can be returned when more samples are needed to calculate the value.
// Report error and continue calling PdhCollectQueryData
Console.WriteLine("error retrieving counter value, status={0:d} (0x{0:X8})", value.CStatus);
}
}
System.Threading.Thread.Sleep(1000);
}while (result == 0 && !Console.KeyAvailable);
}
catch (ManagementException e)
{
Console.WriteLine("Exception caught: " + e.Message);
Console.WriteLine("Stack trace: " + e.StackTrace);
}
}
