[C++] 纯文本查看 复制代码
LPVOID WINAPI HeapReAlloc(
__in HANDLE hHeap,
__in DWORD dwFlags,
__in LPVOID lpMem,
__in SIZE_T dwBytes
);
[C++] 纯文本查看 复制代码
// Heap.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <locale.h>
#include <Windows.h>
int _tmain(int argc, _TCHAR* argv[])
{
setlocale (LC_ALL, "CHS");
SYSTEM_INFO SystemInfo;
HANDLE hHeap;
GetSystemInfo (&SystemInfo);
_tprintf (TEXT("系统内存分页大小：0x%x\n"), SystemInfo.dwPageSize);
_tprintf (TEXT("系统内存分配粒度：0x%x\n"), SystemInfo.dwAllocationGranularity);
/*
//创建一个最大为 5 个分页大小的堆
hHeap = HeapCreate (HEAP_NO_SERIALIZE, SystemInfo.dwPageSize, SystemInfo.dwPageSize * 5);
if (hHeap == NULL) {
_tprintf (TEXT("创建堆错误 ： %d\n"), GetLastError());
return (-1);
}
//SIZE_T dwHeapSize = HeapSize (hHeap, HEAP_NO_SERIALIZE,
*/
HANDLE hHeaps[24];
DWORD dwHeapNum = GetProcessHeaps(24, hHeaps);
_tprintf (TEXT("当前进程默认总共有 %d 个堆\n"), dwHeapNum);
//创建一个最大为 10 个分页大小的堆
hHeap = HeapCreate (HEAP_NO_SERIALIZE, SystemInfo.dwPageSize, SystemInfo.dwPageSize * 30);
if (hHeap == NULL) {
_tprintf (TEXT("创建堆错误 ： %d\n"), GetLastError());
return (-1);
}
_tprintf (TEXT("创建了一个初始化大小为1页,最大10页的堆.\n"));
dwHeapNum = GetProcessHeaps(24, hHeaps);
_tprintf (TEXT("进程现在总共有 %d 个堆\n"), dwHeapNum);
LPVOID lpMem; //内存块指针
//在堆上分配 3 个页面大小的内存
lpMem = HeapAlloc (hHeap, HEAP_ZERO_MEMORY, SystemInfo.dwPageSize * 3);
if (lpMem == NULL) {
_tprintf (TEXT("HeapAlloc error : %d\n"), GetLastError());
return (-2);
}
_tprintf (TEXT("在堆上分配内存成功，起始地址为：0x%x\n"), lpMem);
SIZE_T dwHeapSize = HeapSize(hHeap, HEAP_NO_SERIALIZE, lpMem);
if (dwHeapSize == -1) {
_tprintf (TEXT("获取堆内存块大小错误 ： %d\n"), GetLastError());
return (-3);
}
_tprintf (TEXT("内存块的大小为 : 0x%x\n"), dwHeapSize);
LPVOID lpReAlloc; //重分配后的内存块起始指针
//重新分配内存
lpReAlloc = HeapReAlloc (hHeap, HEAP_ZERO_MEMORY, lpMem, SystemInfo.dwPageSize * 8);
if (lpReAlloc == NULL) {
_tprintf (TEXT("HeapReAlloc error : %d\n"), GetLastError());
return (-4);
}
dwHeapSize = HeapSize(hHeap, HEAP_NO_SERIALIZE, lpReAlloc);
_tprintf (TEXT("重新分配后内存块的大小为 : 0x%x\n"), dwHeapSize);
return 0;
}