如何获得当前的CPU状态，与当前的内存大小(急!!!)

Question

请问如何获得当前的CPU状态，与当前的内存大小，请给出具体的程序，本人在线等待，如果给出的程序，能够运行正确，马上给分。

Answer 1

#include <windows.h>
#include <stdio.h>
#include <conio.h>
int main(int argc, char* argv[])
{
 //初始化SYSTEM_INFO数据结构
    SYSTEM_INFO si;
 GetSystemInfo(&si);
 printf("当前有%d个处理器。\n",si.dwNumberOfProcessors);
 //检查每个处理器的活动状态
 for(DWORD dwPro=0;dwPro<si.dwNumberOfProcessors;dwPro++)
 {
  printf("    处理器%d",dwPro);
  if((si.dwActiveProcessorMask&(1<<dwPro))!=0)
  {
   printf("处于活动状态。\n");
  }
  else
  {
   printf("处于休眠状态。\n");
  }
 }
 getch();
 return 0;
}  检测CPU的使用率（以下转自 C++Builder 研究 - http://www.ccrun.com/article.asp?i=424&d=7jw23a）#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 2

用API获取内存信息  MEMORYSTATUS mem;//定义一个内存状态变量DWORD MemTotal,MemFree,VMemTotal,VMemFree;//存储内存状态信息GlobalMemoryStatus(&mem); //存储内存状态信息
 MemTotal=mem.dwTotalPhys;//得到总内存大小（单位b）
 MemFree=mem.dwAvailPhys;//得到剩余内存大小（单位b）
 VMemTotal=mem.dwTotalVirtual;//得到总虚拟内存大小（单位b）
 VMemFree=mem.dwAvailVirtual;//得到剩余虚拟内存内存大小（单位b）