Windows获取物理内存的2种方式 - 随笔记录

              1 typedef enum _SYSTEM_INFORMATION_CLASS {
  2    SystemBasicInformation,
  3     SystemProcessorInformation,             // obsolete...delete  4    SystemPerformanceInformation,
  5    SystemTimeOfDayInformation,
  6    SystemPathInformation,
  7    SystemProcessInformation,
  8    SystemCallCountInformation,
  9    SystemDeviceInformation,
 10    SystemProcessorPerformanceInformation,
 11    SystemFlagsInformation,
 12    SystemCallTimeInformation,
 13    SystemModuleInformation,
 14    SystemLocksInformation,
 15    SystemStackTraceInformation,
 16    SystemPagedPoolInformation,
 17    SystemNonPagedPoolInformation,
 18    SystemHandleInformation,
 19    SystemObjectInformation,
 20    SystemPageFileInformation,
 21    SystemVdmInstemulInformation,
 22    SystemVdmBopInformation,
 23    SystemFileCacheInformation,
 24    SystemPoolTagInformation,
 25    SystemInterruptInformation,
 26    SystemDpcBehaviorInformation,
 27    SystemFullMemoryInformation,
 28    SystemLoadGdiDriverInformation,
 29    SystemUnloadGdiDriverInformation,
 30    SystemTimeAdjustmentInformation,
 31    SystemSummaryMemoryInformation,
 32    SystemMirrorMemoryInformation,
 33    SystemPerformanceTraceInformation,
 34    SystemObsolete0,
 35    SystemExceptionInformation,
 36    SystemCrashDumpStateInformation,
 37    SystemKernelDebuggerInformation,
 38    SystemContextSwitchInformation,
 39    SystemRegistryQuotaInformation,
 40    SystemExtendServiceTableInformation,
 41    SystemPrioritySeperation,
 42    SystemVerifierAddDriverInformation,
 43    SystemVerifierRemoveDriverInformation,
 44    SystemProcessorIdleInformation,
 45    SystemLegacyDriverInformation,
 46    SystemCurrentTimeZoneInformation,
 47    SystemLookasideInformation,
 48    SystemTimeSlipNotification,
 49    SystemSessionCreate,
 50    SystemSessionDetach,
 51    SystemSessionInformation,
 52    SystemRangeStartInformation,
 53    SystemVerifierInformation,
 54    SystemVerifierThunkExtend,
 55    SystemSessionProcessInformation,
 56    SystemLoadGdiDriverInSystemSpace,
 57    SystemNumaProcessorMap,
 58    SystemPrefetcherInformation,
 59    SystemExtendedProcessInformation,
 60    SystemRecommendedSharedDataAlignment,
 61    SystemComPlusPackage,
 62    SystemNumaAvailableMemory,
 63    SystemProcessorPowerInformation,
 64    SystemEmulationBasicInformation,
 65    SystemEmulationProcessorInformation,
 66    SystemExtendedHandleInformation,
 67    SystemLostDelayedWriteInformation,
 68    SystemBigPoolInformation,
 69    SystemSessionPoolTagInformation,
 70    SystemSessionMappedViewInformation,
 71    SystemHotpatchInformation,
 72    SystemObjectSecurityMode,
 73    SystemWatchdogTimerHandler,
 74    SystemWatchdogTimerInformation,
 75    SystemLogicalProcessorInformation,
 76    SystemWow64SharedInformation,
 77    SystemRegisterFirmwareTableInformationHandler,
 78    SystemFirmwareTableInformation,
 79    SystemModuleInformationEx,
 80    SystemVerifierTriageInformation,
 81    SystemSuperfetchInformation,
 82    SystemMemoryListInformation,
 83    SystemFileCacheInformationEx,
 84     MaxSystemInfoClass,  // MaxSystemInfoClass should always be the last enum 85 86     SystemPageMemoryInformation = 123 87 } SYSTEM_INFORMATION_CLASS, *PSYSTEM_INFORMATION_CLASS;
 88 89 typedef struct _SYSTEM_BASIC_INFORMATION
 90{
 91     ULONG Unknown; //Always contains zero 92     ULONG MaximumIncrement; //一个时钟的计量单位 93     ULONG PhysicalPageSize; //一个内存页的大小 94     ULONG NumberOfPhysicalPages; //系统管理着多少个页 95     ULONG LowestPhysicalPage; //低端内存页 96     ULONG HighestPhysicalPage; //高端内存页 97    ULONG AllocationGranularity;
 98     ULONG LowestUserAddress; //地端用户地址 99     ULONG HighestUserAddress; //高端用户地址100     ULONG ActiveProcessors; //激活的处理器101     UCHAR NumberProcessors; //有多少个处理器102 }SYSTEM_BASIC_INFORMATION, *PSYSTEM_BASIC_INFORMATION;
103104 NTSTATUS (__stdcall *ZwQuerySystemInformation)(
105    _In_      SYSTEM_INFORMATION_CLASS SystemInformationClass,
106    _Inout_   PVOID                    SystemInformation,
107    _In_      ULONG                    SystemInformationLength,
108     _Out_opt_ PULONG                   ReturnLength) = 0;
109110111int _tmain(int argc, _TCHAR* argv[])
112{
113//方式一 ZwQuerySystemInformation114     HMODULE hNtdll = GetModuleHandle(_T("ntdll.dll"));
115     *(LPVOID *)&ZwQuerySystemInformation = GetProcAddress(hNtdll, "ZwQuerySystemInformation");
116117     SYSTEM_BASIC_INFORMATION sbi = { 0 };
118    ZwQuerySystemInformation(
119        SystemBasicInformation,
120         &sbi,
121sizeof(sbi),
122        NULL);
123124     unsigned __int64 nsize = (unsigned __int64)sbi.NumberOfPhysicalPages * sbi.PhysicalPageSize;
125126127//方式二 GlobalMemoryStatusEx128    MEMORYSTATUSEX msex;
129     msex.dwLength = sizeof(msex);
130     GlobalMemoryStatusEx(&msex);
131     msex.ullTotalPhys;//物理内存大小132133return0;
134 }