GetSystemCpuSetInformation function fail in i5-13600K

Question

Hi there.

I'm expecting to divide P / E core index in my program.

But when I call the GetSystemCpuSetInformation, It doesn't work. The function returned FALSE.

Below is the code and envrionment

• CPU : 13th Gen Intel(R) Core(TM) i5-13600K (14 CPUs), ~3.5GHz
• RAM : 32768MB RAM
• VGA : Description: NVIDIA GeForce RTX 4080
• O/S : Windows 10 Pro 64bit, build 191206-1406
• C++ 17

   ULONG size{ 0 };
   ::GetSystemCpuSetInformation( nullptr, 0, &size, handle, 0 );
   DWORD error{ GetLastError() };
   uint8_t* buffer = new uint8_t[ size ];
   _SYSTEM_CPU_SET_INFORMATION* cpu_info = reinterpret_cast<_SYSTEM_CPU_SET_INFORMATION*>( buffer );
   
   if ( !::GetSystemCpuSetInformation( cpu_info, size, &size, handle, 0 ) )
   {
   	SAFE_DELETE_ARRAY( buffer );
   	return false;
   }
   

Is there anything additional to do?

Answer 1

This works for me (Windows 10 22H2) :

                    HANDLE handle = NULL;
                    ULONG nSize = 0;
                    BOOL bRet = GetSystemCpuSetInformation(NULL, 0, &nSize, handle, 0);
                    WCHAR wsText[MAX_PATH] = L"";
                    if (!bRet)
                    {
                        int nError = GetLastError();
                        if (nError == ERROR_INSUFFICIENT_BUFFER)
                        {
                            SYSTEM_CPU_SET_INFORMATION SCSI = { sizeof SYSTEM_CPU_SET_INFORMATION };
                            bRet = GetSystemCpuSetInformation(&SCSI, nSize, &nSize, handle, 0);
                            if (!bRet)
                            {
                                nError = GetLastError();
                                wsprintf(wsText, L"Error : %d\r\n", nError);
                                OutputDebugString(wsText);
                            }
                        }
                        else
                        {
                            wsprintf(wsText, L"Error : %d\r\n", nError);
                            OutputDebugString(wsText);
                        }                       
                    }