unit Unit1;

interface

uses

  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,

  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

  const

  APPCOMMAND_VOLUME_MUTE = $80000;

  WM_APPCOMMAND = $319;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);

begin

SendMessageW(Handle,WM_APPCOMMAND,Handle,APPCOMMAND_VOLUME_MUTE);  //设置静音

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

SendMessageW(Handle,WM_APPCOMMAND,Handle,APPCOMMAND_VOLUME_MUTE);//同样可以解除静音

end;

end.