QueryAuxiliaryCounterFrequency function (realtimeapiset.h)

Queries the auxiliary counter frequency.

Syntax

HRESULT QueryAuxiliaryCounterFrequency(
  [out] PULONGLONG lpAuxiliaryCounterFrequency
);

Parameters

[out] lpAuxiliaryCounterFrequency

Long pointer to an output buffer that contains the specified auxiliary counter frequency. If the auxiliary counter is not supported, the value in the output buffer will be undefined.

Return value

Returns S_OK if the auxiliary counter is supported and E_NOTIMPL if the auxiliary counter is not supported.

Remarks

You can determine the availability of the auxiliary counter by comparing the returned value against E_NOTIMPL.

Examples

The following sample describes how to call QueryAuxiliaryCounterFrequency to retrieve the counter frequency.

#include <stdio.h> 
#include <windows.h> 
int 
wmain (int argc, wchar_t* argv[]) 
{

   ULONGLONG AuxiliaryCounterFrequency;
   HRESULT Result;

   Result = QueryAuxiliaryCounterFrequency(&AuxiliaryCounterFrequency); 
   if (SUCCEEDED(Result)) {
      wprintf(L"Auxiliary counter frequency is: %llu.\n", AuxiliaryCounterFrequency);
   } 
   else if (Result == E_NOTIMPL) {
      wprintf(L"Auxiliary counter is not supported.\n"); 
   }
	  else {
    wprintf(L"Error code: 0x%x.\n", Result);
   }

   return 0; 
} 

Requirements