getprocessheapu.pas

DelphiWin32核心API参考光盘内容.是学习书籍中的源码,便于学习.

unit GetProcessHeapu;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, HeapConst, Grids;

type
  TForm1 = class(TForm)
    Button1: TButton;
    StringGrid1: TStringGrid;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
type
  BufferType = array[0..63] of byte;    // defines the buffer type
var
  Buffer: ^BufferType;                  // the buffer variable
  iLoop: Integer;                       // general loop control variable
begin
  {allocate memory from the heap of the calling process}
  Buffer := HeapAlloc(GetProcessHeap, HEAP_ZERO_MEMORY, sizeof(BufferType));

  {display the default values from the new buffer (should be all zeros)}
  for iLoop := 0 to 63 do
    StringGrid1.Cells[iLoop, 0] := IntToStr(Buffer^[iLoop]);

  {return the memory}
  HeapFree(GetProcessHeap, 0, Buffer);
end;

end.