*《精通Windows API》 5.4.2 分配和释放可读可写的虚拟内存页面

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/* ************************************
*《精通Windows API》 
* 示例代码
* virtual.c
* 5.4.2  分配和释放可读可写的虚拟内存页面
**************************************//* 头文件　*/
#include <windows.h>
#include <stdio.h>/*************************************
* int main(void)
* 功能	演示虚拟内存的使用
*
* 参数	未使用
**************************************/
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，直接分配已提交的内存LPVOID lpAddress = VirtualAlloc(lpRound,sizeVirtual,MEM_COMMIT|MEM_RESERVE,PAGE_READWRITE);if(lpAddress == NULL){printf("VirtualAlloc error: %d\n",GetLastError());return 1;}printf("Alloc:MEM_COMMIT|MEM_RESERVE\n");//复制数据到内存中CopyMemory(lpAddress,"hello",lstrlen("hello"));printf("分配、复制成功，地址：0x%.8x，内容：%s\n",lpAddress,lpAddress);//获取内存信息并打印VirtualQuery(lpAddress,&mbi,sizeof(mbi));printf("使用VirtualQuery获得的信息：\n""BaseAddress:0x%.8x\tAllocationBase:0x%.8x\t""AllocationProtect:0x%.8x\tRegionSize:%u\t""State:0x%.8x\tProtect:0x%.8x\tType:0x%.8x\n",mbi.BaseAddress,mbi.AllocationBase,mbi.AllocationProtect,mbi.RegionSize,mbi.State,mbi.Protect,mbi.Type);设置为READ-ONLY属性//if(!VirtualProtect(lpAddress,0,PAGE_READONLY,NULL))//{//	printf("VirtualProtect error: %d",GetLastError());//	return 1;//}测试READ-ONLY属性,异常//CopyMemory(lpAddress,"read only",lstrlen("read only"));//printf(lpAddress);获取内存信息并打印//VirtualQuery(lpAddress,&mbi,sizeof(mbi));//printf("使用VirtualQuery获得的信息：\n"//	"BaseAddress:0x%.8x\tAllocationBase:0x%.8x\t"//	"AllocationProtect:0x%.8x\tRegionSize:%d\t"//	"State:0x%.8x\tProtect:0x%.8x\tType:0x%.8x\n",//	mbi.BaseAddress,mbi.AllocationBase,//	mbi.AllocationProtect,mbi.RegionSize,//	mbi.State,mbi.Protect,mbi.Type//	);//DECOMMIT释放，页面将变为保留状态printf("Free: DECOMMIT\n");if(!VirtualFree(lpRound,sizeVirtual,MEM_DECOMMIT)){printf("VirtualFree error: %d",GetLastError());return 1;}//获取内存信息并打印VirtualQuery(lpAddress,&mbi,sizeof(mbi));printf("使用VirtualQuery获得的信息：\n""BaseAddress:0x%.8x\tAllocationBase:0x%.8x\t""AllocationProtect:0x%.8x\tRegionSize:%u\t""State:0x%.8x\tProtect:0x%.8x\tType:0x%.8x\n",mbi.BaseAddress,mbi.AllocationBase,mbi.AllocationProtect,mbi.RegionSize,mbi.State,mbi.Protect,mbi.Type);//释放内存printf("Free:RELEASE\n");if(!VirtualFree(lpAddress,0,MEM_RELEASE)){printf("VirtualFree error: %d",GetLastError());return 1;}return 0;
}

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