Delphi屏蔽WebBrowser网页中的声音

procedure TForm1.FormCreate(Sender: TObject);
var
  hDSound: Cardinal;
  pDirectSoundCreate: Pointer;
  hWinmm: Cardinal;
  pmidiStreamOpen: Pointer;
  pwaveOutWrite: Pointer;
  lp: Cardinal;
begin
  hDSound := LoadLibrary('DSound.dll');
  if hDSound > 0 then
    pDirectSoundCreate := GetProcAddress(hDSound, 'DirectSoundCreate');
  if pDirectSoundCreate <> nil then
  begin
    VirtualProtect(pDirectSoundCreate, 3, PAGE_EXECUTE_READWRITE, lp);
    Move(#$C2#$0C#$00, pDirectSoundCreate^, 3);
  end;

  hWinmm := LoadLibrary('Winmm.dll');
  if hWinmm > 0 then
    pmidiStreamOpen := GetProcAddress(hWinmm, 'midiStreamOpen');
  if pmidiStreamOpen <> nil then
  begin
    VirtualProtect(pmidiStreamOpen, 3, PAGE_EXECUTE_READWRITE, lp);
    Move(#$C2#$04#$00, pmidiStreamOpen^, 3);
  end;

  if hWinmm > 0 then
    pwaveOutWrite := GetProcAddress(hWinmm, 'waveOutWrite');
  if pwaveOutWrite <> nil then
  begin
    VirtualProtect(pwaveOutWrite, 3, PAGE_EXECUTE_READWRITE, lp);
    Move(#$C2#$0C#$00, pwaveOutWrite^, 3);
  end;
end;
把原的来函数地址保存下来还可以随时恢愎（恢愎完要刷新网页）。