C++内存管理

#include<Windows.h>
#include<iostream>
using namespace std;
void main()
{
	MEMORYSTATUS ms;       //存储状态
	LPVOID pVir;
	LPVOID pMal;
	GlobalMemoryStatus(&ms);
	cout<<"分配存储前的存储状态"<<endl;
	cout<<"存储状态长度"<<ms.dwLength<<"Bytes"<<endl;
	cout<<"本地存储"<<ms.dwMemoryLoad<<"%"<<endl;
	cout<<"全部物理存储"<<ms.dwTotalPhys/(1024*1024)<<"MB"<<endl;
	cout<<"全部页文件"<<ms.dwTotalPageFile/(1024*1024)<<"MB"<<endl;
	cout<<"可用页文件"<<ms.dwAvailPageFile/(1024*1024)<<"MB"<<endl;
	cout<<"全部虚拟存储"<<ms.dwTotalVirtual/(1024*1024)<<"MB"<<endl;
	cout<<"可用虚拟存储"<<ms.dwAvailVirtual/(1024*1024)<<"MB"<<endl;
	cout<<"现在分配32M虚拟存储和16M物理存储"<<endl;
	pVir=VirtualAlloc(NULL,1024*1024*32,MEM_COMMIT|MEM_RESERVE,PAGE_READWRITE);
	if(!pVir)
	{
		cout<<"虚拟存储分配失败"<<endl;
	}
	pMal=malloc(1024*1024*16);
	GlobalMemoryStatus(&ms);
	cout<<"分配存储后的存储状态"<<endl;
	cout<<"存储状态长度"<<ms.dwLength<<"Bytes"<<endl;
	cout<<"本地存储"<<ms.dwMemoryLoad<<"%"<<endl;
	cout<<"全部物理存储"<<ms.dwTotalPhys/(1024*1024)<<"MB"<<endl;
	cout<<"全部页文件"<<ms.dwTotalPageFile/(1024*1024)<<"MB"<<endl;
	cout<<"可用页文件"<<ms.dwAvailPageFile/(1024*1024)<<"MB"<<endl;
	cout<<"全部虚拟存储"<<ms.dwTotalVirtual/(1024*1024)<<"MB"<<endl;
	cout<<"可用虚拟存储"<<ms.dwAvailVirtual/(1024*1024)<<"MB"<<endl;
	cout<<"现在释放32M虚拟存储和16M物理存储"<<endl;
	if(!VirtualFree(pVir,0,MEM_RELEASE))
	{
		cout<<"释放虚拟存储失败"<<endl;
	}
	free(pMal);
	GlobalMemoryStatus(&ms);
	cout<<"释放存储后的存储状态"<<endl;
	cout<<"存储状态长度"<<ms.dwLength<<"Bytes"<<endl;
	cout<<"本地存储"<<ms.dwMemoryLoad<<"%"<<endl;
	cout<<"全部物理存储"<<ms.dwTotalPhys/(1024*1024)<<"MB"<<endl;
	cout<<"全部页文件"<<ms.dwTotalPageFile/(1024*1024)<<"MB"<<endl;
	cout<<"可用页文件"<<ms.dwAvailPageFile/(1024*1024)<<"MB"<<endl;
	cout<<"全部虚拟存储"<<ms.dwTotalVirtual/(1024*1024)<<"MB"<<endl;
	cout<<"可用虚拟存储"<<ms.dwAvailVirtual/(1024*1024)<<"MB"<<endl;
}