#include <windows.h>
#include <pdh.h>
#include <pdhmsg.h>
#include <iostream>
template <typename T> T type_cast(T, void* p) { return (T)p; }
static PDH_STATUS (WINAPI *pPdhOpenQueryW)(LPCWSTR, DWORD_PTR, PDH_HQUERY*);
static PDH_STATUS (WINAPI *pPdhAddCounterW)(PDH_HQUERY, LPCWSTR, DWORD_PTR, PDH_HCOUNTER*);
static PDH_STATUS (WINAPI *pPdhCollectQueryData)(PDH_HQUERY);
static PDH_STATUS (WINAPI *pPdhGetFormattedCounterValue)(PDH_HCOUNTER, DWORD, LPDWORD, PPDH_FMT_COUNTERVALUE);
static PDH_STATUS (WINAPI *pPdhCloseQuery)(PDH_HQUERY);
static PDH_STATUS (WINAPI *pPdhRemoveCounter)(PDH_HCOUNTER);
PDH_STATUS DispTime()
{
HQUERY hQuery;
HCOUNTER hCounter;
PDH_STATUS status;
PDH_FMT_COUNTERVALUE FmtValue;
/* 新規クエリーを作成 */
status = pPdhOpenQueryW(NULL, 0, &hQuery);
/* 既に起動しているメモ帳のCPU使用率のカウンタをクエリーに追加 */
status = pPdhAddCounterW(hQuery, L"\\Processor(0)\\% Processor Time", 0, &hCounter);
/* 計測 */
printf("計測開始...\n");
status = pPdhCollectQueryData(hQuery);
Sleep(10000); /* 十秒間待つ */
status = pPdhCollectQueryData(hQuery);
printf("計測終了.\n");
/* 今の十秒間での、メモ帳のCPUの使用率を表示 */
status = pPdhGetFormattedCounterValue(hCounter, PDH_FMT_DOUBLE, NULL, &FmtValue);
printf("CPU使用率: %f%%\n", FmtValue.doubleValue);
/* 終了 */
status = pPdhCloseQuery(hQuery);
return status;
}
int main()
{
HMODULE hmodPDH = LoadLibrary("pdh.dll");
pPdhOpenQueryW = type_cast(pPdhOpenQueryW, GetProcAddress(hmodPDH, "PdhOpenQueryW"));
pPdhAddCounterW = type_cast(pPdhAddCounterW,GetProcAddress(hmodPDH, "PdhAddCounterW"));
pPdhRemoveCounter = type_cast(pPdhRemoveCounter,GetProcAddress(hmodPDH, "PdhRemoveCounter"));
pPdhCollectQueryData = type_cast(pPdhCollectQueryData,GetProcAddress(hmodPDH, "PdhCollectQueryData"));
pPdhGetFormattedCounterValue = type_cast(pPdhGetFormattedCounterValue,GetProcAddress(hmodPDH, "PdhGetFormattedCounterValue"));
pPdhCloseQuery = type_cast(pPdhCloseQuery,GetProcAddress(hmodPDH, "PdhCloseQuery"));
DispTime();
FreeLibrary(hmodPDH);
return 0;
}