获取CPU占用 无奈啊~~

HQUERY          hQuery;

	HCOUNTER        *pCounterHandle;

	PDH_STATUS      pdhStatus;

	PDH_FMT_COUNTERVALUE  fmtValue;

	DWORD          ctrType;

	//CHAR            szPathBuffer[MAXPATH] = {'\0'};

	CString		  szPathBuffer="";

	int            nRetCode = 0;



	// Open the query object.

	pdhStatus = PdhOpenQuery (0, 0, &hQuery);



	pCounterHandle = (HCOUNTER *)GlobalAlloc(GPTR, sizeof(HCOUNTER));



	CHAR  szCounterBuffer[MAX_PATH];	

	PDH_COUNTER_PATH_ELEMENTS  pdh_Path;

 	 pdh_Path.szMachineName =NULL;

	pdh_Path.szObjectName = "Processor";

	pdh_Path.szInstanceName = "0"; //看资料说这里传0表示获取机器当前的CPU占用率可我这返回的怎么是99.999?

//还有如果在这写个进程名如(explorer) 就会得到error -1这个结果  这是为什么呢？？

	pdh_Path.szParentInstance = NULL;

	pdh_Path.dwInstanceIndex = 0;

	pdh_Path.szCounterName = "% Processor Time";

	DWORD length=MAX_PATH;

	// 产生完整的路径

	PdhMakeCounterPath ( &pdh_Path, szCounterBuffer, &length, 0);

	szPathBuffer = szCounterBuffer;



	pdhStatus = PdhAddCounter (hQuery,

		szPathBuffer, 

		0, 

		pCounterHandle);

	// "Prime" counters that need two values to display a 

	//  formatted value.

	pdhStatus = PdhCollectQueryData (hQuery);



	// Get the current value of this counter.

	pdhStatus = PdhGetFormattedCounterValue (*pCounterHandle,

		PDH_FMT_DOUBLE,

		&ctrType,

		&fmtValue);



	CString strRes;

	//fmtValue.doubleValue为所要的结果

	if (pdhStatus == ERROR_SUCCESS)

		strRes.Format("%.20g",fmtValue.doubleValue);

	else 

		// Print the error value.

		strRes.Format("error -1");

	



	// Close the query.

	pdhStatus = PdhCloseQuery (hQuery);



	//return nRetCode;

	return strRes;