在Delphi2010中启用CoInternetIsFeatureEnabled

Question

I am trying to deactivate the annoying sound when clicking a link in WebBrowser control, WITHOUT changing the user registry. I've found documentation that this can be done through CoInternetIsFeatureEnabled , also explained here . But i have no idea how to implement it on Delphi 2010, since i am getting "Undeclared Identifier" error after including URLMon unit into the project and not much documentation out there.

Any ideas?

Answer 1

CoInternetIsFeatureEnabled() and CoInternetSetFeatureEnabled() are not included in D2010's copy of UrlMon.pas. You will have to declare them manually, eg:

const
  GET_FEATURE_FROM_THREAD = $00000001;
  GET_FEATURE_FROM_PROCESS = $00000002;
  GET_FEATURE_FROM_REGISTRY = $00000004;
  GET_FEATURE_FROM_THREAD_LOCALMACHINE = $00000008;
  GET_FEATURE_FROM_THREAD_INTRANET = $00000010;
  GET_FEATURE_FROM_THREAD_TRUSTED = $00000020;
  GET_FEATURE_FROM_THREAD_INTERNET = $00000040;
  GET_FEATURE_FROM_THREAD_RESTRICTED = $00000080;

  SET_FEATURE_ON_THREAD = $00000001;
  SET_FEATURE_ON_PROCESS = $00000002;
  SET_FEATURE_IN_REGISTRY = $00000004;
  SET_FEATURE_ON_THREAD_LOCALMACHINE = $00000008;
  SET_FEATURE_ON_THREAD_INTRANET = $00000010;
  SET_FEATURE_ON_THREAD_TRUSTED = $00000020;
  SET_FEATURE_ON_THREAD_INTERNET = $00000040;
  SET_FEATURE_ON_THREAD_RESTRICTED = $00000080; 

type
  INTERNETFEATURELIST = (
    FEATURE_OBJECT_CACHING,
    FEATURE_ZONE_ELEVATION,
    FEATURE_MIME_HANDLING,
    FEATURE_MIME_SNIFFING,
    FEATURE_WINDOW_RESTRICTIONS,
    FEATURE_WEBOC_POPUPMANAGEMENT,
    FEATURE_BEHAVIORS,
    FEATURE_DISABLE_MK_PROTOCOL,
    FEATURE_LOCALMACHINE_LOCKDOWN,
    FEATURE_SECURITYBAND,
    FEATURE_RESTRICT_ACTIVEXINSTALL,
    FEATURE_VALIDATE_NAVIGATE_URL,
    FEATURE_RESTRICT_FILEDOWNLOAD,
    FEATURE_ADDON_MANAGEMENT,
    FEATURE_PROTOCOL_LOCKDOWN,
    FEATURE_HTTP_USERNAME_PASSWORD_DISABLE,
    FEATURE_SAFE_BINDTOOBJECT,
    FEATURE_UNC_SAVEDFILECHECK,
    FEATURE_GET_URL_DOM_FILEPATH_UNENCODED,
    FEATURE_TABBED_BROWSING,
    FEATURE_SSLUX,
    FEATURE_DISABLE_NAVIGATION_SOUNDS,
    FEATURE_DISABLE_LEGACY_COMPRESSION,
    FEATURE_FORCE_ADDR_AND_STATUS,
    FEATURE_XMLHTTP,
    FEATURE_DISABLE_TELNET_PROTOCOL,
    FEATURE_FEEDS,
    FEATURE_BLOCK_INPUT_PROMPTS,
    FEATURE_ENTRY_COUNT
  );

function CoInternetIsFeatureEnabled(FeatureEntry: INTERNETFEATURELIST; dwFlags: DWORD): HRESULT; stdcall; external 'urlmon.dll'
function CoInternetSetFeatureEnabled(FeatureEntry: INTERNETFEATURELIST; dwFlags: DWORD; fEnable: BOOL): HRESULT; stdcall; external 'urlmon.dll'

begin
  if CoInternetIsFeatureEnabled(FEATURE_DISABLE_NAVIGATION_SOUNDS, GET_FEATURE_FROM_PROCESS) = S_FALSE then
    CoInternetSetFeatureEnabled(FEATURE_DISABLE_NAVIGATION_SOUNDS, SET_FEATURE_ON_PROCESS, True); 
end;