c++清理内存_c++内存清理

c++清理内存
1.内存状态监控 实时显示物理内存/备用内存使用情况
2.单进程内存清理 清理当前进程工作集内存
3.系统级内存清理 清理备用列表、已修改页、组合列表
4.全局进程优化 强制清理所有进程的工作集
5.权限管理 启用调试权限以执行敏感操作
6.用户交互 控制台菜单操作与实时监控模式
ps：清理内存需要管理员权限
去这个目录C:\Users\wangrusheng\source\repos\CMakeProject1\out\build\x64-debug\CMakeProject1，找到exe，用管理员打开。
效果图：

step1:cmake
C:\Users\wangrusheng\source\repos\CMakeProject1\CMakeProject1\CMakeLists.txt

cmake_minimum_required(VERSION 3.12)
project(CMakeProject1)
set(CMAKE_CXX_STANDARD 20)
find_library(Ntdll_Library NAMES ntdll)
add_executable(CMakeProject1
    CMakeProject1.cpp
    memory_cleaner.cpp
    memory_cleaner.h
)
target_link_libraries(CMakeProject1 
    Psapi
    Advapi32
    ${Ntdll_Library})
if(MSVC)
    target_compile_options(CMakeProject1 PRIVATE /W4 /WX)
else()
    target_compile_options(CMakeProject1 PRIVATE -Wall -Wextra -Werror)
endif()

step2: main.cpp
C:\Users\wangrusheng\source\repos\CMakeProject1\CMakeProject1\CMakeProject1.cpp

#include"memory_cleaner.h"#include<iostream>#include<chrono>#include<thread>#include<conio.h>usingnamespace std;usingnamespace MemoryUtils;voidPrintMenu(){system("cls");
    cout <<"==== 内存清理工具 ====\n";
    cout <<"1. 显示当前内存状态\n";
    cout <<"2. 执行内存清理\n";
    cout <<"3. 实时监控内存（每秒刷新）\n";
    cout <<"4. 退出\n";
    cout <<"请选择操作: ";}voidCleanMemory(){
    MEMORYSTATUSEX memBefore{sizeof(MEMORYSTATUSEX)};GlobalMemoryStatusEx(&memBefore);if(!CleanAllProcessesWorkingSet()){
        cerr <<"清理工作集失败！\n";return;}CleanStandbyList();CleanModifiedPageList();
    MEMORYSTATUSEX memAfter{sizeof(MEMORYSTATUSEX)};GlobalMemoryStatusEx(&memAfter);
    cout <<"已清理内存: "<<(memAfter.ullAvailPhys - memBefore.ullAvailPhys)/(1024*1024)<<" MB\n";}voidMonitorMemory(){while(!_kbhit()){DisplayMemoryStatus();
        this_thread::sleep_for(1s);}_getch();// 清除键盘缓冲区}intmain(){if(!EnableDebugPrivilege()){
        cerr <<"警告: 无法获取调试权限，部分清理功能可能受限！\n";}while(true){PrintMenu();switch(_getch()){case'1':DisplayMemoryStatus();system("pause");break;case'2':CleanMemory();system("pause");break;case'3':MonitorMemory();break;case'4':return0;default:
            cerr <<"无效选项！\n";
            this_thread::sleep_for(1s);}}}

step3: clear.h
C:\Users\wangrusheng\source\repos\CMakeProject1\CMakeProject1\memory_cleaner.h

#ifndefMEMORY_CLEANER_H#defineMEMORY_CLEANER_H#include<windows.h>// 定义 NTSTATUS 类型#ifndefNTSTATUStypedef LONG NTSTATUS;#endif// 定义 NT_SUCCESS 宏#ifndefNT_SUCCESS#defineNT_SUCCESS(Status)(((NTSTATUS)(Status))>=0)#endiftypedefenum_SYSTEM_MEMORY_LIST_COMMAND{
    MemoryPurgeStandbyList =1,
    MemoryPurgeLowPriorityStandbyList,
    MemoryPurgeModifiedPageList,
    MemoryPurgeCombinedPageList
} SYSTEM_MEMORY_LIST_COMMAND;#defineSystemMemoryListInformation80#ifdef__cplusplusextern"C"{#endif
    NTSTATUS NTAPI NtSetSystemInformation(
        _In_ INT SystemInformationClass,
        _Inout_ PVOID SystemInformation,
        _In_ ULONG SystemInformationLength
    );#ifdef__cplusplus}#endifnamespace MemoryUtils {voidDisplayMemoryStatus();boolCleanWorkingSet();boolCleanStandbyList(bool clearLowPriority =false);boolCleanModifiedPageList();boolCleanCombinedPageList();boolCleanAllProcessesWorkingSet();boolEnableDebugPrivilege();}#endif// MEMORY_CLEANER_H

step4:clear.cpp
C:\Users\wangrusheng\source\repos\CMakeProject1\CMakeProject1\memory_cleaner.cpp

#include"memory_cleaner.h"#include<iostream>#include<psapi.h>#include<tlhelp32.h>usingnamespace std;// 声明函数指针类型typedefNTSTATUS(NTAPI* PNtSetSystemInformation)(
    _In_ INT SystemInformationClass,
    _Inout_ PVOID SystemInformation,
    _In_ ULONG SystemInformationLength
    );// 全局函数指针static PNtSetSystemInformation NtSetSystemInformationPtr =nullptr;// 初始化函数指针staticboolInitializeNtFunction(){
    HMODULE hNtdll =GetModuleHandleW(L"ntdll.dll");if(hNtdll){
        NtSetSystemInformationPtr =(PNtSetSystemInformation)GetProcAddress(hNtdll,"NtSetSystemInformation");return(NtSetSystemInformationPtr !=nullptr);}returnfalse;}boolMemoryUtils::EnableDebugPrivilege(){
    HANDLE hToken;if(!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,&hToken))returnfalse;
    TOKEN_PRIVILEGES tp;
    LUID luid;if(!LookupPrivilegeValue(nullptr, SE_DEBUG_NAME,&luid)){CloseHandle(hToken);returnfalse;}
    tp.PrivilegeCount =1;
    tp.Privileges[0].Luid = luid;
    tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;if(!AdjustTokenPrivileges(hToken, FALSE,&tp,sizeof(TOKEN_PRIVILEGES),nullptr,nullptr)){CloseHandle(hToken);returnfalse;}CloseHandle(hToken);returntrue;}voidMemoryUtils::DisplayMemoryStatus(){
    MEMORYSTATUSEX memStatus;
    memStatus.dwLength =sizeof(MEMORYSTATUSEX);GlobalMemoryStatusEx(&memStatus);
    cout <<"物理内存使用: "<<(memStatus.ullTotalPhys - memStatus.ullAvailPhys)/(1024ULL*1024*1024)<<" GB / "<< memStatus.ullTotalPhys /(1024ULL*1024*1024)<<" GB ("<< memStatus.dwMemoryLoad <<"%)\n";
    cout <<"备用内存列表: "<< memStatus.ullAvailExtendedVirtual /(1024ULL*1024)<<" MB\n";}boolMemoryUtils::CleanWorkingSet(){returnEmptyWorkingSet(GetCurrentProcess());}boolMemoryUtils::CleanStandbyList(bool clearLowPriority){if(!NtSetSystemInformationPtr &&!InitializeNtFunction()){returnfalse;}
    SYSTEM_MEMORY_LIST_COMMAND command = clearLowPriority ?
        MemoryPurgeLowPriorityStandbyList : MemoryPurgeStandbyList;
    NTSTATUS status =NtSetSystemInformationPtr(
        SystemMemoryListInformation,&command,sizeof(SYSTEM_MEMORY_LIST_COMMAND));returnNT_SUCCESS(status);}boolMemoryUtils::CleanModifiedPageList(){if(!NtSetSystemInformationPtr &&!InitializeNtFunction()){returnfalse;}
    SYSTEM_MEMORY_LIST_COMMAND command = MemoryPurgeModifiedPageList;
    NTSTATUS status =NtSetSystemInformationPtr(
        SystemMemoryListInformation,&command,sizeof(SYSTEM_MEMORY_LIST_COMMAND));returnNT_SUCCESS(status);}boolMemoryUtils::CleanCombinedPageList(){if(!NtSetSystemInformationPtr &&!InitializeNtFunction()){returnfalse;}
    SYSTEM_MEMORY_LIST_COMMAND command = MemoryPurgeCombinedPageList;
    NTSTATUS status =NtSetSystemInformationPtr(
        SystemMemoryListInformation,&command,sizeof(SYSTEM_MEMORY_LIST_COMMAND));returnNT_SUCCESS(status);}boolMemoryUtils::CleanAllProcessesWorkingSet(){
    HANDLE hProcessSnap =CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);if(hProcessSnap == INVALID_HANDLE_VALUE)returnfalse;
    PROCESSENTRY32 pe32;
    pe32.dwSize =sizeof(PROCESSENTRY32);if(!Process32First(hProcessSnap,&pe32)){CloseHandle(hProcessSnap);returnfalse;}do{if(pe32.th32ProcessID ==0)continue;
        HANDLE hProcess =OpenProcess(
            PROCESS_QUERY_INFORMATION | PROCESS_SET_QUOTA | PROCESS_VM_OPERATION | PROCESS_VM_READ,
            FALSE,
            pe32.th32ProcessID);if(hProcess){EmptyWorkingSet(hProcess);CloseHandle(hProcess);}}while(Process32Next(hProcessSnap,&pe32));CloseHandle(hProcessSnap);returntrue;}

step5:选择全部重新生成
step6,直接运行
step7:关掉控制台，C:\Users\wangrusheng\source\repos\CMakeProject1\out\build\x64-debug\CMakeProject1
在这个目录，找到exe文件，管理员权限打开，输入1显示内存，输入2，清理内存
end