Windows获取物理内存的2种方式 - 随笔记录

            <span>  1</span> typedef <span>enum</span><span> _SYSTEM_INFORMATION_CLASS {
</span><span>  2</span><span>    SystemBasicInformation,
</span><span>  3</span>     SystemProcessorInformation,             <span>//</span><span> obsolete...delete</span><span>  4</span><span>    SystemPerformanceInformation,
</span><span>  5</span><span>    SystemTimeOfDayInformation,
</span><span>  6</span><span>    SystemPathInformation,
</span><span>  7</span><span>    SystemProcessInformation,
</span><span>  8</span><span>    SystemCallCountInformation,
</span><span>  9</span><span>    SystemDeviceInformation,
</span><span> 10</span><span>    SystemProcessorPerformanceInformation,
</span><span> 11</span><span>    SystemFlagsInformation,
</span><span> 12</span><span>    SystemCallTimeInformation,
</span><span> 13</span><span>    SystemModuleInformation,
</span><span> 14</span><span>    SystemLocksInformation,
</span><span> 15</span><span>    SystemStackTraceInformation,
</span><span> 16</span><span>    SystemPagedPoolInformation,
</span><span> 17</span><span>    SystemNonPagedPoolInformation,
</span><span> 18</span><span>    SystemHandleInformation,
</span><span> 19</span><span>    SystemObjectInformation,
</span><span> 20</span><span>    SystemPageFileInformation,
</span><span> 21</span><span>    SystemVdmInstemulInformation,
</span><span> 22</span><span>    SystemVdmBopInformation,
</span><span> 23</span><span>    SystemFileCacheInformation,
</span><span> 24</span><span>    SystemPoolTagInformation,
</span><span> 25</span><span>    SystemInterruptInformation,
</span><span> 26</span><span>    SystemDpcBehaviorInformation,
</span><span> 27</span><span>    SystemFullMemoryInformation,
</span><span> 28</span><span>    SystemLoadGdiDriverInformation,
</span><span> 29</span><span>    SystemUnloadGdiDriverInformation,
</span><span> 30</span><span>    SystemTimeAdjustmentInformation,
</span><span> 31</span><span>    SystemSummaryMemoryInformation,
</span><span> 32</span><span>    SystemMirrorMemoryInformation,
</span><span> 33</span><span>    SystemPerformanceTraceInformation,
</span><span> 34</span><span>    SystemObsolete0,
</span><span> 35</span><span>    SystemExceptionInformation,
</span><span> 36</span><span>    SystemCrashDumpStateInformation,
</span><span> 37</span><span>    SystemKernelDebuggerInformation,
</span><span> 38</span><span>    SystemContextSwitchInformation,
</span><span> 39</span><span>    SystemRegistryQuotaInformation,
</span><span> 40</span><span>    SystemExtendServiceTableInformation,
</span><span> 41</span><span>    SystemPrioritySeperation,
</span><span> 42</span><span>    SystemVerifierAddDriverInformation,
</span><span> 43</span><span>    SystemVerifierRemoveDriverInformation,
</span><span> 44</span><span>    SystemProcessorIdleInformation,
</span><span> 45</span><span>    SystemLegacyDriverInformation,
</span><span> 46</span><span>    SystemCurrentTimeZoneInformation,
</span><span> 47</span><span>    SystemLookasideInformation,
</span><span> 48</span><span>    SystemTimeSlipNotification,
</span><span> 49</span><span>    SystemSessionCreate,
</span><span> 50</span><span>    SystemSessionDetach,
</span><span> 51</span><span>    SystemSessionInformation,
</span><span> 52</span><span>    SystemRangeStartInformation,
</span><span> 53</span><span>    SystemVerifierInformation,
</span><span> 54</span><span>    SystemVerifierThunkExtend,
</span><span> 55</span><span>    SystemSessionProcessInformation,
</span><span> 56</span><span>    SystemLoadGdiDriverInSystemSpace,
</span><span> 57</span><span>    SystemNumaProcessorMap,
</span><span> 58</span><span>    SystemPrefetcherInformation,
</span><span> 59</span><span>    SystemExtendedProcessInformation,
</span><span> 60</span><span>    SystemRecommendedSharedDataAlignment,
</span><span> 61</span><span>    SystemComPlusPackage,
</span><span> 62</span><span>    SystemNumaAvailableMemory,
</span><span> 63</span><span>    SystemProcessorPowerInformation,
</span><span> 64</span><span>    SystemEmulationBasicInformation,
</span><span> 65</span><span>    SystemEmulationProcessorInformation,
</span><span> 66</span><span>    SystemExtendedHandleInformation,
</span><span> 67</span><span>    SystemLostDelayedWriteInformation,
</span><span> 68</span><span>    SystemBigPoolInformation,
</span><span> 69</span><span>    SystemSessionPoolTagInformation,
</span><span> 70</span><span>    SystemSessionMappedViewInformation,
</span><span> 71</span><span>    SystemHotpatchInformation,
</span><span> 72</span><span>    SystemObjectSecurityMode,
</span><span> 73</span><span>    SystemWatchdogTimerHandler,
</span><span> 74</span><span>    SystemWatchdogTimerInformation,
</span><span> 75</span><span>    SystemLogicalProcessorInformation,
</span><span> 76</span><span>    SystemWow64SharedInformation,
</span><span> 77</span><span>    SystemRegisterFirmwareTableInformationHandler,
</span><span> 78</span><span>    SystemFirmwareTableInformation,
</span><span> 79</span><span>    SystemModuleInformationEx,
</span><span> 80</span><span>    SystemVerifierTriageInformation,
</span><span> 81</span><span>    SystemSuperfetchInformation,
</span><span> 82</span><span>    SystemMemoryListInformation,
</span><span> 83</span><span>    SystemFileCacheInformationEx,
</span><span> 84</span>     MaxSystemInfoClass,  <span>//</span><span> MaxSystemInfoClass should always be the last enum</span><span> 85</span><span> 86</span>     SystemPageMemoryInformation = <span>123</span><span> 87</span> } SYSTEM_INFORMATION_CLASS, *<span>PSYSTEM_INFORMATION_CLASS;
</span><span> 88</span><span> 89</span> typedef <span>struct</span><span> _SYSTEM_BASIC_INFORMATION
</span><span> 90</span><span>{
</span><span> 91</span>     ULONG Unknown; <span>//</span><span>Always contains zero</span><span> 92</span>     ULONG MaximumIncrement; <span>//</span><span>一个时钟的计量单位</span><span> 93</span>     ULONG PhysicalPageSize; <span>//</span><span>一个内存页的大小</span><span> 94</span>     ULONG NumberOfPhysicalPages; <span>//</span><span>系统管理着多少个页</span><span> 95</span>     ULONG LowestPhysicalPage; <span>//</span><span>低端内存页</span><span> 96</span>     ULONG HighestPhysicalPage; <span>//</span><span>高端内存页</span><span> 97</span><span>    ULONG AllocationGranularity;
</span><span> 98</span>     ULONG LowestUserAddress; <span>//</span><span>地端用户地址</span><span> 99</span>     ULONG HighestUserAddress; <span>//</span><span>高端用户地址</span><span>100</span>     ULONG ActiveProcessors; <span>//</span><span>激活的处理器</span><span>101</span>     UCHAR NumberProcessors; <span>//</span><span>有多少个处理器</span><span>102</span> }SYSTEM_BASIC_INFORMATION, *<span>PSYSTEM_BASIC_INFORMATION;
</span><span>103</span><span>104</span> NTSTATUS (__stdcall *<span>ZwQuerySystemInformation)(
</span><span>105</span><span>    _In_      SYSTEM_INFORMATION_CLASS SystemInformationClass,
</span><span>106</span><span>    _Inout_   PVOID                    SystemInformation,
</span><span>107</span><span>    _In_      ULONG                    SystemInformationLength,
</span><span>108</span>     _Out_opt_ PULONG                   ReturnLength) = <span>0</span><span>;
</span><span>109</span><span>110</span><span>111</span><span>int</span> _tmain(<span>int</span> argc, _TCHAR*<span> argv[])
</span><span>112</span><span>{
</span><span>113</span><span>//</span><span>方式一 ZwQuerySystemInformation</span><span>114</span>     HMODULE hNtdll = GetModuleHandle(_T(<span>"</span><span>ntdll.dll</span><span>"</span><span>));
</span><span>115</span>     *(LPVOID *)&ZwQuerySystemInformation = GetProcAddress(hNtdll, <span>"</span><span>ZwQuerySystemInformation</span><span>"</span><span>);
</span><span>116</span><span>117</span>     SYSTEM_BASIC_INFORMATION sbi = { <span>0</span><span> };
</span><span>118</span><span>    ZwQuerySystemInformation(
</span><span>119</span><span>        SystemBasicInformation,
</span><span>120</span>         &<span>sbi,
</span><span>121</span><span>sizeof</span><span>(sbi),
</span><span>122</span><span>        NULL);
</span><span>123</span><span>124</span>     unsigned __int64 nsize = (unsigned __int64)sbi.NumberOfPhysicalPages *<span> sbi.PhysicalPageSize;
</span><span>125</span><span>126</span><span>127</span><span>//</span><span>方式二 GlobalMemoryStatusEx</span><span>128</span><span>    MEMORYSTATUSEX msex;
</span><span>129</span>     msex.dwLength = <span>sizeof</span><span>(msex);
</span><span>130</span>     GlobalMemoryStatusEx(&<span>msex);
</span><span>131</span>     msex.ullTotalPhys;<span>//</span><span>物理内存大小</span><span>132</span><span>133</span><span>return</span><span>0</span><span>;
</span><span>134</span> }