【Windows核心编程】VirtualAlloc 例子

// VirtualAlloc.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <Windows.h>
#include <process.h>
#include <iostream>
using namespace std;

#ifdef UNICODE
#define  PRINT wcout
#else
#define  PRINT cout
#endif

int _tmain(int argc, _TCHAR* argv[])
{
    SIZE_T sizeOfLargePage = GetLargePageMinimum();
    if (0 == sizeOfLargePage)
    {
        cerr<<"error in GetLargePageMinium \n"<<endl;
        return -1;
    }
    cout<<"sizeOfLargePage is "<<sizeOfLargePage<<endl;

    int nCount = 10;

    //PVOID pAddr = VirtualAlloc(NULL, sizeOfLargePage * nCount, MEM_LARGE_PAGES | MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
    PVOID pAddr = VirtualAlloc(NULL, sizeOfLargePage * nCount, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);

    if (NULL == pAddr)
    {
        cerr<<"error in VirtualAlloc \n";
        return -2;
    }

    TCHAR szBuffer[] = _T("hello world!");
    size_t nBuffer = _countof(szBuffer); 

    
   // memcpy_s(pAddr, _countof(szBuffer), szBuffer, _countof(szBuffer)); //_countof参数只能是数组，返回字符数
    memcpy_s(pAddr, sizeof(szBuffer), szBuffer,sizeof(szBuffer));


    PRINT<<(TCHAR*)pAddr<<endl;

    VirtualFree(pAddr, 0, MEM_DECOMMIT | MEM_RELEASE); 

    return 0;
}