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  • WinApi学习笔记分配和释放虚拟内存

    Code
    #include <windows.h>
    #include 
    <stdio.h>
    #include 
    <iostream>

    using namespace std;

    int main(void)
    {
        SIZE_T sizeVirtual 
    = 4000;//大小
        LPVOID lpRound = (LPVOID)0x100000FF;//地址
        MEMORY_BASIC_INFORMATION mbi;//内存信息

        
    //分配内存
        
    //MEM_COMMIT|MEM_RESERVE直接把内存从空闲状态变为已提交的状态
        
    //PAGE_READWRITE 内存的保护属性
        LPVOID lpAddress = VirtualAlloc(lpRound,sizeVirtual,MEM_COMMIT|MEM_RESERVE,PAGE_READWRITE);

        
    if(lpAddress == NULL)
        {
            std::cout
    <<"error"<<GetLastError()<<std::endl;
            
    return 1;
        }

        std::cout
    <<"alloc:MEM_COMMIT|MEM_RESERVE"<<std::endl;

        CopyMemory(lpAddress,
    "hello Memmory",lstrlen("hello Memmory"));

        std::cout
    <<"分配  复制成功"<<std::endl<<"地址:0x"<<lpAddress<<std::endl;
        std::cout
    <<"内容:"<<(LPSTR)lpAddress<<std::endl;

        
    //获取内存信息
        VirtualQuery(lpAddress,&mbi,sizeof(mbi));
        cout
    <<"VirtualQuery获取信息"<<endl;
        cout
    <<"基地址:0x"<<mbi.BaseAddress<<endl;
        cout
    <<"内存的保护属性"<<mbi.AllocationProtect<<endl;
        cout
    <<"内存状态:0x"<<mbi.State<<endl;

        VirtualFree(lpRound,sizeVirtual,MEM_DECOMMIT);
        cout
    <<"内存以decommit释放"<<endl<<"再次查看内存信息:"<<endl;

            
    //获取内存信息
        VirtualQuery(lpAddress,&mbi,sizeof(mbi));
        cout
    <<"VirtualQuery获取信息"<<endl;
        cout
    <<"基地址:0x"<<mbi.BaseAddress<<endl;
        cout
    <<"内存的保护属性"<<mbi.AllocationProtect<<endl;
        cout
    <<"内存状态:0x"<<mbi.State<<endl;

        VirtualFree(lpAddress,
    0,MEM_RELEASE);
        cout
    <<"内存被释放"<<endl<<"再次查看内存信息:"<<endl;

            
    //获取内存信息
        VirtualQuery(lpAddress,&mbi,sizeof(mbi));
        cout
    <<"VirtualQuery获取信息"<<endl;
        cout
    <<"基地址:0x"<<mbi.BaseAddress<<endl;
        cout
    <<"内存的保护属性"<<mbi.AllocationProtect<<endl;
        cout
    <<"内存状态:0x"<<mbi.State<<endl;

        CHAR a;
        std::cin
    >>a;

    }
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  • 原文地址:https://www.cnblogs.com/liulun/p/1577355.html
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