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内存管理[6]本例效果图:
unit Unit1;
interface
uses 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.
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