[急问] 如何用winapi获取win2000的系统负载情况

Question

如任务数,内存占用量, 任务时间,......

Answer 1

试试这个行不行，我也没试过#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;///////////////////////////////////////////////////////////////////////////////////////////////////////////////
////                main          /////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////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% =  - (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 2

你说的任务是不是指进程？获取内存使用情况的函数：GlobalMemoryStatus()
获取进程有关的函数：EnumProcesses()、EnumProcessModules()、GetProcessTimes()、GetProcessMemoryInfo()等。在MSDN上有例子可以看。

Answer 3

NTSYSAPI NTSTATUS NTAPI ZwQuerySystemInformation
(IN SYSTEM_INFORMATION_CLASS SystemInfomationClass,
 IN OUT PVOID SystemInformation,
 IN ULONG SystemInformationLength,
 OUT PULONG ReturnLength OPTIONAL
);

Answer 4

详细结构定义和使用请看《Windows NT/2000 Native API Reference》

Answer 5

to: linfeng1216(林枫) 就是进程t0: codewarrior(会思考的草)  
解释下面一下
NTSYSAPI NTSTATUS NTAPI ZwQuerySystemInformation
(IN SYSTEM_INFORMATION_CLASS SystemInfomationClass,
 IN OUT PVOID SystemInformation,
 IN ULONG SystemInformationLength,
 OUT PULONG ReturnLength OPTIONAL
);