ggjj们，怎么能取到系统的cpu占用率，内存占用率等？

Question

有地方说注册表可以，可我不知道是哪一个键啊？
还有一种判断进程执行时间的方法好像比较复杂，
有没有系统函数调用？

Answer 1

xp下有个nt.dll ，load进来，调用他的NtQuerySystemInformation 函数，什么都有了，要是系统比较低级象98那种的没nt.dll的也许要用注册表了，这个不知道了，没用过

Answer 2

NtQuerySystemInformation ，自己可以到微软上看看

Answer 3

//cpu 的使用率
//只在bcb里编译过，#include <windows.h>
#include <conio.h>
#include <stdio.h>#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;
// ntdll!NtQuerySystemInformation (NT specific!)
//
// The function copies the system information of the
// specified type into a buffer
//
// NTSYSAPI
// NTSTATUS
// NTAPI
// NtQuerySystemInformation(
//    IN UINT SystemInformationClass,    // information type
//    OUT PVOID SystemInformation,       // pointer to buffer
//    IN ULONG SystemInformationLength,  // buffer size in bytes
//    OUT PULONG ReturnLength OPTIONAL   // pointer to a 32-bit
//                                       // variable that receives
//                                       // the number of bytes
//                                       // written to the buffer 
// );
typedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG);PROCNTQSI NtQuerySystemInformation;
void main(void)
{
    SYSTEM_PERFORMANCE_INFORMATION SysPerfInfo;
    SYSTEM_TIME_INFORMATION        SysTimeInfo;
    SYSTEM_BASIC_INFORMATION       SysBaseInfo;
    double                         dbIdleTime;
    double                         dbSystemTime;
    LONG                           status;
    LARGE_INTEGER                  liOldIdleTime = {0,0};
    LARGE_INTEGER                  liOldSystemTime = {0,0};    NtQuerySystemInformation = (PROCNTQSI)GetProcAddress(
                                          GetModuleHandle("ntdll"),
                                         "NtQuerySystemInformation"
                                         );    if (!NtQuerySystemInformation)
        return;    // get number of processors in the system
    status = NtQuerySystemInformation(SystemBasicInformation,&SysBaseInfo,sizeof(SysBaseInfo),NULL);
    if (status != NO_ERROR)
        return;
    
printf("\nCPU Usage (press any key to exit):    ");
    while(!kbhit())
    {
        // get new system time
    status = NtQuerySystemInformation(SystemTimeInformation,&SysTimeInfo,sizeof(SysTimeInfo),0);
        if (status!=NO_ERROR)
            return;        // get new CPU's idle time
        status = NtQuerySystemInformation(SystemPerformanceInformation,&SysPerfInfo,sizeof(SysPerfInfo),NULL);
        if (status != NO_ERROR)
            return;        // if it's a first call - skip it
       if (liOldIdleTime.QuadPart != 0)
       {
            // CurrentValue = NewValue - OldValue
            dbIdleTime = Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime);
            dbSystemTime = Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);            // CurrentCpuIdle = IdleTime / SystemTime
            dbIdleTime = dbIdleTime / dbSystemTime;            // CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors
            dbIdleTime = 100.0 - dbIdleTime * 100.0 / (double)SysBaseInfo.bKeNumberProcessors + 0.5;            printf("\b\b\b\b%3d%%",(UINT)dbIdleTime);
       }        // store new CPU's idle and system time
        liOldIdleTime = SysPerfInfo.liIdleTime;
        liOldSystemTime = SysTimeInfo.liKeSystemTime;        // wait one second
        Sleep(1000);
    }
    printf("\n");
}

Answer 4

获得CPU主频率：
CPU主频率、厂家测试源程序（VC下嵌入汇编）CString CKillJSDlg::GetCPUFactoryName()
{
int nCPUName[ 20 ] = { 0 };
_asm
{
mov eax, 0
cpuid
mov nCPUName[ 0 ], ebx
mov nCPUName[ 4 ], edx
mov nCPUName[ 8 ], ecx
}
return ( TCHAR* )nCPUName;
}CString CKillJSDlg::GetCPUFrequence()
{
int nTime [ 2 ];
int nCPUClock;
_asm
{
rdtsc
mov nTime[ 0 ], edx
mov nTime[ 1 ], eax
}
Sleep( 1000 );
_asm
{
rdtsc
sub eax, nTime[ 1 ]
sub edx, nTime[ 0 ]
mov nCPUClock, eax
}
CString str;
str.Format( "%dMHz", nCPUClock / 1000000 );
return str;
}
获得cpu占用率：
=====================================================参考一：
// cpusagent.cpp (Windows NT/2000)
//
// Getting the CPU usage in percent on Windows NT/2000
//
// (c)2000 Ashot Oganesyan K, SmartLine, Inc
// mailto:[email protected], http://www.protect-me.com, http://www.codepile.com#include <windows.h>
#include <conio.h>
#include <stdio.h>#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;
// ntdll!NtQuerySystemInformation (NT specific!)
//
// The function copies the system information of the
// specified type into a buffer
//
// NTSYSAPI
// NTSTATUS
// NTAPI
// NtQuerySystemInformation(
// IN UINT SystemInformationClass, // information type
// OUT PVOID SystemInformation, // pointer to buffer
// IN ULONG SystemInformationLength, // buffer size in bytes
// OUT PULONG ReturnLength OPTIONAL // pointer to a 32-bit
// // variable that receives
// // the number of bytes
// // written to the buffer 
// );
typedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG);PROCNTQSI NtQuerySystemInformation;
void main(void)
{
SYSTEM_PERFORMANCE_INFORMATION SysPerfInfo;
SYSTEM_TIME_INFORMATION SysTimeInfo;
SYSTEM_BASIC_INFORMATION SysBaseInfo;
double dbIdleTime;
double dbSystemTime;
LONG status;
LARGE_INTEGER liOldIdleTime = {0,0};
LARGE_INTEGER liOldSystemTime = {0,0};NtQuerySystemInformation = (PROCNTQSI)GetProcAddress(
GetModuleHandle("ntdll"),
"NtQuerySystemInformation"
);if (!NtQuerySystemInformation)
return;// get number of processors in the system
status = NtQuerySystemInformation(SystemBasicInformation,&SysBaseInfo,sizeof(SysBaseInfo),NULL);
if (status != NO_ERROR)
return;printf("\nCPU Usage (press any key to exit): ");
while(!_kbhit())
{
// get new system time
status = NtQuerySystemInformation(SystemTimeInformation,&SysTimeInfo,sizeof(SysTimeInfo),0);
if (status!=NO_ERROR)
return;// get new CPU's idle time
status = NtQuerySystemInformation(SystemPerformanceInformation,&SysPerfInfo,sizeof(SysPerfInfo),NULL);
if (status != NO_ERROR)
return;// if it's a first call - skip it
if (liOldIdleTime.QuadPart != 0)
{
// CurrentValue = NewValue - OldValue
dbIdleTime = Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime);
dbSystemTime = Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);// CurrentCpuIdle = IdleTime / SystemTime
dbIdleTime = dbIdleTime / dbSystemTime;// CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors
dbIdleTime = 100.0 - dbIdleTime * 100.0 / (double)SysBaseInfo.bKeNumberProcessors + 0.5;printf("\b\b\b\b%3d%%",(UINT)dbIdleTime);
}// store new CPU's idle and system time
liOldIdleTime = SysPerfInfo.liIdleTime;
liOldSystemTime = SysTimeInfo.liKeSystemTime;// wait one second
Sleep(1000);
}
printf("\n");
}
参考二下面这个类是从一个project中提出来的，原作者是Norm Almond 
// CpuUsage.h: interface for the CCpuUsage class.
//
//////////////////////////////////////////////////////////////////////#if !defined(AFX_CPUUSAGE_H__60CF4F03_9F01_41E8_A9FB_51F065D5F3C2__INCLUDED_)
#define AFX_CPUUSAGE_H__60CF4F03_9F01_41E8_A9FB_51F065D5F3C2__INCLUDED_#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000#include <pdh.h>
#include <pdhmsg.h>#pragma comment(lib,"PDH.lib")
#define MAX_RAW_VALUES 20const char szCounterName[] = "\\Processor(_Total)\\% Processor Time";typedef struct _tag_PDHCounterStruct {
HCOUNTER hCounter; // Handle to the counter - given to use by PDH Library
int nNextIndex; // element to get the next raw value
int nOldestIndex; // element containing the oldes raw value
int nRawCount; // number of elements containing raw values
PDH_RAW_COUNTER a_RawValue[MAX_RAW_VALUES]; // Ring buffer to contain raw values
} PDHCOUNTERSTRUCT, *PPDHCOUNTERSTRUCT;
class CCpuUsage 
{
public:
CCpuUsage();
virtual ~CCpuUsage();
BOOL Init();
int GetUsage();protected:PPDHCOUNTERSTRUCT m_pCounterStruct;
HQUERY m_hQuery;
};#endif // !defined(AFX_CPUUSAGE_H__60CF4F03_9F01_41E8_A9FB_51F065D5F3C2__INCLUDED_)
// CpuUsage.cpp: implementation of the CCpuUsage class.
//
//////////////////////////////////////////////////////////////////////#include "stdafx.h"
#include "CpuUsage.h"#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////CCpuUsage::CCpuUsage()
{
m_hQuery = NULL;
m_pCounterStruct = NULL;}CCpuUsage::~CCpuUsage()
{PdhCloseQuery(m_hQuery);
delete m_pCounterStruct;
}
BOOL CCpuUsage::Init()
{
if (ERROR_SUCCESS != PdhOpenQuery(NULL, 1, &m_hQuery))
return FALSE;m_pCounterStruct = (PPDHCOUNTERSTRUCT) new PDHCOUNTERSTRUCT;PDH_STATUS pdh_status = PdhAddCounter(m_hQuery, szCounterName, (DWORD) m_pCounterStruct, &(m_pCounterStruct->hCounter));
if (ERROR_SUCCESS != pdh_status) 
{
return FALSE;
}return TRUE;
}
int CCpuUsage::GetUsage()
{
PDH_FMT_COUNTERVALUE pdhFormattedValue;PdhCollectQueryData(m_hQuery);if (ERROR_SUCCESS != PdhGetFormattedCounterValue( 
m_pCounterStruct->hCounter,
PDH_FMT_LONG,
NULL,
&pdhFormattedValue )) 
{
return 0;
}return pdhFormattedValue.longValue;
}

Answer 5

http://www.codeguru.com/Cpp/W-P/system/performancestatistics/article.php/c2845/#more