WinApi学习笔记-分配和释放虚拟内存

#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;

}