CPU TIMES (WIN32)

#define _WIN32_WINNT 0x0500
#include <windows.h>
#include <Winternl.h>

typedef int (__stdcall *pNTQUERYINFO) (ULONG,PVOID,ULONG,PULONG);

char buff[1024];
char szappname[] = "CpuTimes";
char szInfo[] = "IdleTime\t\tKernelTime\tUserTime\n";

void InfoCpus()
{
  SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION infos[16]; // 48 octets chaque
  DWORD ret, i;
  pNTQUERYINFO pquery;
  char *c;
  HINSTANCE hdll = LoadLibrary("Ntdll.dll");
  if(!hdll) return;
  pquery = (pNTQUERYINFO) GetProcAddress(hdll, "NtQuerySystemInformation");
  if(!pquery) goto relDll;
  ret = 0;
  pquery(SystemProcessorPerformanceInformation, &infos, sizeof(infos), &ret);
  if(!ret) goto relDll;
  if(ret > sizeof(infos)) goto relDll;
  ret /= 48; // nbr de structs remplies
  strcpy(buff, szInfo);
  c = buff+30;
  for(i = 0; i < ret; i++) {
    _i64toa(infos[i].IdleTime.QuadPart, c, 10);
    while(*c) c++;
    *c++ = 9;
    _i64toa(infos[i].KernelTime.QuadPart, c, 10);
    while(*c) c++;
    *c++ = 9;
    _i64toa(infos[i].UserTime.QuadPart, c, 10);
    while(*c) c++;
    *c++ = '\n';
  }
  *(c-1) = 0;
  MessageBox(0, buff, szappname, 0);
relDll: FreeLibrary(hdll);
}

DWORD VerifWin2Kmini()
{
  OSVERSIONINFO osvi;
  osvi.dwPlatformId = osvi.dwMajorVersion = 0;
  osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
  GetVersionEx(&osvi);
  if(osvi.dwPlatformId != VER_PLATFORM_WIN32_NT) return 0;
  return (osvi.dwMajorVersion >= 5);
}

int WINAPI WinMain(HINSTANCE, HINSTANCE, PSTR, int)
{
  if(!VerifWin2Kmini()) return 0;
  InfoCpus();
  return 0;
}