使用 TRegistry 类[4]: 文件打开与文件图标的关联

代码文件:

---

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Memo1: TMemo;

    Button1: TButton;

    Button2: TButton;

    procedure Button1Click(Sender: TObject);

    procedure FormCreate(Sender: TObject);

    procedure Button2Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses Registry, ShlObj;



procedure TForm1.FormCreate(Sender: TObject);

begin

  Memo1.Align := alTop;

  Memo1.ScrollBars := ssBoth;

  Button1.Caption := '设置文件关联、图标关联';

  Button2.Caption := '取消设置';



  if (ParamStr(1) <> '') and FileExists(ParamStr(1)) then

    Memo1.Lines.LoadFromFile(ParamStr(1));

end;



procedure TForm1.Button1Click(Sender: TObject);

var

  reg: TRegistry;

begin

  reg := TRegistry.Create;

  reg.RootKey := HKEY_CLASSES_ROOT;



  {在注册表中添加我们虚拟的 .tst 格式, 并指定默认项的值是 TestFile}

  reg.OpenKey('.tst', True);

  reg.WriteString('', 'TestFile');

  reg.CloseKey;



  {文件打开关联}

  reg.OpenKey('TestFile\shell\open\command', True);

  reg.WriteString('', ParamStr(0) + ' %1');

  reg.CloseKey;



  {文件图标关联}

  reg.OpenKey('TestFile\DefaultIcon', True);

  reg.WriteString('', ParamStr(0) + ',0');

  reg.CloseKey;



  reg.Free;



  {刷新图标显示}

  SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, nil, nil);

end;



{清除上面的设置}

procedure TForm1.Button2Click(Sender: TObject);

var

  reg: TRegistry;

begin

  reg := TRegistry.Create;

  reg.RootKey := HKEY_CLASSES_ROOT;

  reg.DeleteKey('.tst');

  reg.DeleteKey('TestFile');

  reg.Free;

  SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, nil, nil);

end;



end.