如何获取windows系统资源

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总的虚拟内存：

    #include "windows.h"

    MEMORYSTATUSEX memInfo;
    memInfo.dwLength = sizeof(MEMORYSTATUSEX);
    GlobalMemoryStatusEx(&memInfo);
    DWORDLONG totalVirtualMem = memInfo.ullTotalPageFile;

注：名称“TotalPageFile”是有些误导这里。在现实中这个参数给“虚拟内存大小”，这是交换文件，另加安装的RAM的大小。

目前使用的虚拟内存：

相同的代码，如“总的虚拟内存”，然后

DWORDLONG virtualMemUsed = memInfo.ullTotalPageFile - memInfo.ullAvailPageFile;

目前使用的虚拟内存的当前进程：

    #include "windows.h"
    #include "psapi.h"

    PROCESS_MEMORY_COUNTERS_EX pmc;
    GetProcessMemoryInfo(GetCurrentProcess(), &pmc, sizeof(pmc));
    SIZE_T virtualMemUsedByMe = pmc.PrivateUsage;

总物理内存（RAM）：

相同的代码，如“总的虚拟内存”，然后

DWORDLONG totalPhysMem = memInfo.ullTotalPhys;

目前使用的物理内存：

相同的代码，如“总的虚拟内存”，然后

DWORDLONG physMemUsed = memInfo.ullTotalPhys - memInfo.ullAvailPhys;

目前使用的物理内存的当前进程：

在“虚拟内存相同的代码目前使用的当前进程”，然后

SIZE_T physMemUsedByMe = pmc.WorkingSetSize;

目前使用的CPU：

    #include "TCHAR.h"
    #include "pdh.h"

    static PDH_HQUERY cpuQuery;
    static PDH_HCOUNTER cpuTotal;

    void init(){
    PdhOpenQuery(NULL, NULL, &cpuQuery);
    PdhAddCounter(cpuQuery, L"\\Processor(_Total)\\% Processor Time", NULL, &cpuTotal);
    PdhCollectQueryData(cpuQuery);
    }

    double getCurrentValue(){
    PDH_FMT_COUNTERVALUE counterVal;

    PdhCollectQueryData(cpuQuery);
    PdhGetFormattedCounterValue(cpuTotal, PDH_FMT_DOUBLE, NULL, &counterVal);
    return counterVal.doubleValue;
    }

目前使用的CPU的当前进程：

    #include "windows.h"

    static ULARGE_INTEGER lastCPU, lastSysCPU, lastUserCPU;
    static int numProcessors;
    static HANDLE self;

    void init(){
    SYSTEM_INFO sysInfo;
    FILETIME ftime, fsys, fuser;

    GetSystemInfo(&sysInfo);
    numProcessors = sysInfo.dwNumberOfProcessors;

    GetSystemTimeAsFileTime(&ftime);
    memcpy(&lastCPU, &ftime, sizeof(FILETIME));

    self = GetCurrentProcess();
    GetProcessTimes(self, &ftime, &ftime, &fsys, &fuser);
    memcpy(&lastSysCPU, &fsys, sizeof(FILETIME));
    memcpy(&lastUserCPU, &fuser, sizeof(FILETIME));
    }

    double getCurrentValue(){
    FILETIME ftime, fsys, fuser;
    ULARGE_INTEGER now, sys, user;
    double percent;

    GetSystemTimeAsFileTime(&ftime);
    memcpy(&now, &ftime, sizeof(FILETIME));

    GetProcessTimes(self, &ftime, &ftime, &fsys, &fuser);
    memcpy(&sys, &fsys, sizeof(FILETIME));
    memcpy(&user, &fuser, sizeof(FILETIME));
    percent = (sys.QuadPart - lastSysCPU.QuadPart) +
    (user.QuadPart - lastUserCPU.QuadPart);
    percent /= (now.QuadPart - lastCPU.QuadPart);
    percent /= numProcessors;
    lastCPU = now;
    lastUserCPU = user;
    lastSysCPU = sys;

    return percent * 100;
    }

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