如何获得“CPU使用率”？？？

[ctech]

SDK或者MFC有没有提供相应接口？？ 谢谢！

[ctech]

谁知道呢？？ 先谢谢楼上的

[chaobill]

#define SystemBasicInformation 0
#define SystemPerformanceInformation 2
#define SystemTimeInformation 3
#define Li2Double(x) ((double)((x).HighPart) * 4.294967296E9 + (double)((x).LowPart))

typedef struct
{
DWORD dwUnknown1;
ULONG uKeMaximumIncrement;
ULONG uPageSize;
ULONG uMmNumberOfPhysicalPages;
ULONG uMmLowestPhysicalPage;
ULONG uMmHighestPhysicalPage;
ULONG uAllocationGranularity;
PVOID pLowestUserAddress;
PVOID pMmHighestUserAddress;
ULONG uKeActiveProcessors;
BYTE bKeNumberProcessors;
BYTE bUnknown2;
WORD wUnknown3;
} SYSTEM_BASIC_INFORMATION;

typedef struct
{
LARGE_INTEGER liIdleTime;
DWORD dwSpare[76];
} SYSTEM_PERFORMANCE_INFORMATION;

typedef struct
{
LARGE_INTEGER liKeBootTime;
LARGE_INTEGER liKeSystemTime;
LARGE_INTEGER liExpTimeZoneBias;
ULONG uCurrentTimeZoneId;
DWORD dwReserved;
} SYSTEM_TIME_INFORMATION;

int GetCPUUsgesNT()
{
SYSTEM_PERFORMANCE_INFORMATION SysPerfInfo;
SYSTEM_TIME_INFORMATION SysTimeInfo;
SYSTEM_BASIC_INFORMATION SysBaseInfo;
double dbIdleTime;
double dbSystemTime;
LONG status;
typedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG);
PROCNTQSI NtQuerySystemInformation;

int rc;
static LARGE_INTEGER m_liOldIdleTime;
static LARGE_INTEGER m_liOldSystemTime;

NtQuerySystemInformation = (PROCNTQSI)GetProcAddress(GetModuleHandle("ntdll"), "NtQuerySystemInformation");
if (!NtQuerySystemInformation)return -1;
status = NtQuerySystemInformation(SystemBasicInformation, &SysBaseInfo,sizeof(SysBaseInfo),NULL);
if (status != NO_ERROR)return -1;
status = NtQuerySystemInformation(SystemTimeInformation,&SysTimeInfo,sizeof(SysTimeInfo),0);
if (status!=NO_ERROR)return -1;
status = NtQuerySystemInformation(SystemPerformanceInformation,&SysPerfInfo,sizeof(SysPerfInfo),NULL);
if (status != NO_ERROR) return-1;



dbIdleTime = Li2Double(SysPerfInfo.liIdleTime) - Li2Double(m_liOldIdleTime);
dbSystemTime = Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(m_liOldSystemTime);

m_liOldIdleTime = SysPerfInfo.liIdleTime;
m_liOldSystemTime = SysTimeInfo.liKeSystemTime;

rc=(int)( 100.0 - (dbIdleTime / dbSystemTime)* 100.0 / (double)SysBaseInfo.bKeNumberProcessors + 0.5);
return rc;
}

void CCpuUsgesCtl::GetCpuUsges9X()
{
HKEY hkey;
DWORD dwDataSize;
DWORD dwType;
DWORD dwCpuUsage;

// starting the counter
if ( RegOpenKeyEx( HKEY_DYN_DATA,
"PerfStats\\StartStat",
0,KEY_ALL_ACCESS,
&hkey ) != ERROR_SUCCESS
)
{
return;
}

dwDataSize=sizeof(DWORD);
RegQueryValueEx( hkey,
"KERNEL\\CPUUsage",
NULL,&dwType,
(LPBYTE)&dwCpuUsage,
&dwDataSize );

RegCloseKey(hkey);

// geting current counter's value
if ( RegOpenKeyEx( HKEY_DYN_DATA,
"PerfStats\\StatData",
0,KEY_READ,
&hkey ) != ERROR_SUCCESS)
{
return;
}

dwDataSize=sizeof(DWORD);
RegQueryValueEx( hkey,
"KERNEL\\CPUUsage",
NULL,&dwType,
(LPBYTE)&dwCpuUsage,
&dwDataSize );

m_fNewUsges = dwCpuUsage;
RegCloseKey(hkey);

// stoping the counter
if ( RegOpenKeyEx( HKEY_DYN_DATA,
"PerfStats\\StopStat",
0,KEY_ALL_ACCESS,
&hkey ) != ERROR_SUCCESS)
{
return;
}

dwDataSize=sizeof(DWORD);
RegQueryValueEx( hkey,
"KERNEL\\CPUUsage",
NULL,&dwType,
(LPBYTE)&dwCpuUsage,
&dwDataSize );

RegCloseKey(hkey);
}