u00302.pas

来自「Delphi编程五大妙招源程序」· PAS 代码 · 共 144 行

unit U00302;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    Button8: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button8Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
//下面函数返回当前程序的目录
function GetCurrentPath :string;
begin
  Result:=ExtractFilePath(Application.Exename);
end;

//得到光驱
Function GetCDROM :String;
Var
  drv :DWORD;
  mask :BYTE;
  drive :String;
begin
  mask :=$80;
  drv :=GetLogicalDrives;
  Repeat
    if (drv and mask)<>0 then Break;
    mask :=mask shr 1;
  Until False;
  Repeat
  drv :=Trunc(log2(mask))+65;
  drive :=Chr(drv)+':';
  if GetDriveType(PChar(drive))=5 then Break;
  mask :=mask shr 1;
  until (mask=1);
  Result :=drive;
end;

//得到windows目录
function GetWindowsDir: String;
var
  ac: array [1..20] of Char;
  pc: PChar;
begin
  pc := @ac;
  GetWindowsDirectory(pc, 20);
  Result := pc;
end;

//得到System目录
function GetSystemDir: String;
var
  ac: array [1..20] of Char;
  pc: PChar;
begin
  pc := @ac;
  GetTempPath(20, pc); 
  Result := pc;
end;

//得到windows临时路径
function GetTempDir: String;
var
  ac: array [1..20] of Char;
  pc: PChar;
begin
  pc := @ac;
  GetSystemDirectory(pc, 20);
  Result := pc;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  Caption := GetCurrentPath ;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Caption := GetCDROM
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  Caption := GetWindowsDir ;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
  Caption := GetSystemDir ;
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
  Caption := GetTempDir ;
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
  if FileExists('0030301.txt') Then Application.MessageBox('你所找的文件已经找到','提示',MB_OK)
                               Else Application.MessageBox('你所找的文件没有找到','提示',MB_OK) ;

end;

procedure TForm1.Button8Click(Sender: TObject);
begin
  Caption := ExtractFileExt('0030301.txt')
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
  Caption := ChangeFileExt('0030301.txt', '.htm');
end;

end.