Delphi实现获取磁盘空间大小的方法

unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls;
type
TForm1 = class(TForm)
Edit1: TEdit;
Button1: TButton;
Label1: TLabel;
Label2: TLabel;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
driver:pchar;
sec1, byt1, cl1, cl2:longword;
begin
driver:=pchar(edit1.text);//要显示的驱动器名
GetDiskFreeSpace(driver, sec1, byt1, cl1, cl2);
cl1 := cl1*sec1 * byt1;
cl2 := cl2*sec1 * byt1;
Label1.Caption:= '该驱动器总共容量' + Formatfloat('###,##0',cl2) + '字节';
Label2.Caption := '该驱动器可用容量' + Formatfloat('###,##0',cl1) + '字节';
end;
end.