delphi 内存管理[6]

unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    Button2: TButton;    Memo1: TMemo;    Memo2: TMemo;    procedure Button1Click(Sender: TObject);    procedure Button2Click(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}//测试堆的内存占用情况procedure TForm1.Button1Click(Sender: TObject);var  MyHeap: THandle;  mem: TMemoryStatus;  m1,m2,m3: DWORD;begin  {获取当前内存可用状态}  GlobalMemoryStatus(mem);  m1 := mem.dwAvailPhys;     {可用物理内存}  m2 := mem.dwAvailPageFile; {可用虚拟内存}  m3 := mem.dwAvailVirtual;  {可用虚拟地址}  {建立私有堆}  MyHeap := HeapCreate(HEAP_NO_SERIALIZE, 1024*1204, 0); {建立 1 M 大小的堆}  {再获取当前内存可用状态}  GlobalMemoryStatus(mem);  m1 := m1 - mem.dwAvailPhys;  m2 := m2 - mem.dwAvailPageFile;  m3 := m3 - mem.dwAvailVirtual;  {显示堆占用内存的情况}  Memo1.Clear;  Memo1.Lines.Add(Format('占用物理内存: %d K', [m1 div 1024]));  Memo1.Lines.Add(Format('占用虚拟内存: %d K', [m2 div 1024]));  Memo1.Lines.Add(Format('占用虚拟地址: %d K', [m3 div 1024]));  {释放堆}  HeapDestroy(MyHeap);end;//同上个过程, 外加测试建立堆时页对齐的情况procedure TForm1.Button2Click(Sender: TObject);var  MyHeap: THandle;  mem: TMemoryStatus;  m1,m2,m3: DWORD;begin  GlobalMemoryStatus(mem);  m1 := mem.dwAvailPhys;       m2 := mem.dwAvailPageFile;   m3 := mem.dwAvailVirtual;  {建立 1M + 1字节 大小的堆, 但实际大小会按页对齐, 结果应该是: 1M + 4K}  MyHeap := HeapCreate(HEAP_NO_SERIALIZE, 1024*1204 + 1, 0);  GlobalMemoryStatus(mem);  m1 := m1 - mem.dwAvailPhys;  m2 := m2 - mem.dwAvailPageFile;  m3 := m3 - mem.dwAvailVirtual;  Memo2.Clear;  Memo2.Lines.Add(Format('占用物理内存: %d K', [m1 div 1024]));  Memo2.Lines.Add(Format('占用虚拟内存: %d K', [m2 div 1024]));  Memo2.Lines.Add(Format('占用虚拟地址: %d K', [m3 div 1024]));  HeapDestroy(MyHeap);end;end.