public object Download(IProgressHost progressHost)
{
ResetTimeoutState();
_finalUrl = Url;
ProgressHost = progressHost;
// call the URLDownloadToFile (synchronous, notifies us of progress
// via calls to IBindStatusCallback)
SetCookies();
int result = UrlMon.URLDownloadToFile(
IntPtr.Zero, Url, FilePath, 0, this);
// check for errors in the call
// TODO: account for errors that we purposely generate (E_ACCESSDENIED)
// HRESULT E_ABORT 0x80004004
switch (result)
{
case HRESULT.S_OK: // The download succeeded
break;
case HRESULT.E_ABORT: // The download has been cancelled
//case HRESULT.E_ACCESSDENIED: // no idea
if (progressHost.CancelRequested)
{
throw new OperationCancelledException();
}
break;
default:
throw new COMException("Unable to download file " + Url, result);
}
;
return(this);
}
public static string GetMIMEFromPath(string Path)
{
if (!File.Exists(Path))
{
throw new FileNotFoundException($"\"{Path}\" not found");
}
byte[] Buffer = new byte[256];
using (FileStream Stream = new FileStream(Path, FileMode.Open, FileAccess.Read))
{
Stream.Read(Buffer, 0, 256);
}
IntPtr Pointer = Marshal.AllocHGlobal(256);
try
{
Marshal.Copy(Buffer, 0, Pointer, 256);
if (UrlMon.FindMimeFromData(null, null, Pointer, 256, null, UrlMon.FMFD.FMFD_DEFAULT, out string MIMEResult) == HRESULT.S_OK)
{
return(MIMEResult);
}
else
{
MimeType MIME = new MimeTypes().GetMimeTypeFromFile(Path);
if (MIME != null)
{
return(MIME.Name);
}
else
{
return("unknown/unknown");
}
}
}
catch (Exception ex)
{
LogTracer.Log(ex, $"An exception was threw in {nameof(GetMIMEFromPath)}");
return("unknown/unknown");
}
finally
{
Marshal.FreeHGlobal(Pointer);
}
}
/// <summary>
/// Determines whether a string is a valid Url
/// </summary>
/// <param name="url">The url to validate</param>
/// <returns>true if the url is a valid url, otherwise false</returns>
public static bool IsUrl(string url)
{
if (url != null && url.IndexOf("://", StringComparison.OrdinalIgnoreCase) > -1)
{
try
{
Uri uri = new Uri(url);
}
catch (UriFormatException)
{
return(false);
}
return(true);
}
else
{
return(false);
}
#if false
// TODO: For some reason, IsvalidURL is always returning 1 (S_FALSE)
// no matter what URL you pass into the sucker.
// Handle only the base URL
if (url.IndexOf("?") > -1)
{
url = url.Substring(0, url.IndexOf("?"));
}
int hResult = UrlMon.IsValidURL(
IntPtr.Zero,
url,
0);
switch (hResult)
{
case HRESULT.S_OK:
return(true);
case HRESULT.E_INVALIDARG:
Trace.Log("IsUrl returned HRESULT.E_INVALIDARG for this url: " + url);
return(false);
case HRESULT.S_FALSE:
default:
return(false);
}
#endif
}
/// <summary>
/// Initializes the Internet features that should be applied to the embedded browsers launched by this process.
/// </summary>
public static void InitInternetFeatures()
{
//Turn on Local Machine Lockdown mode. This ensures HTML accidentally executed in the
//Local Machine security zone does not get privileges elevated
UrlMon.CoInternetSetFeatureEnabled(FEATURE.LOCALMACHINE_LOCKDOWN, INTERNETSETFEATURE.ON_PROCESS, true);
//enable the security band so it will be displayed if any embedded browser control wants to prompt for permission
//Note: the security band does not work for the MSHTML editor.
UrlMon.CoInternetSetFeatureEnabled(FEATURE.SECURITYBAND, INTERNETSETFEATURE.ON_PROCESS, true);
//Unset locking down the Behaviors feature so that the editor's custom behaviors will load.
//Local Machine lockdown mode will lockdown the behaviors feature completely for HTML executed
//in the Local Machine security zone. This guarantees that editor behaviors no matter how tightly
//the system has browsers locked down.
//Note: this probably isn't necessary now that the editor always loads HTML in the Internet Zone.
UrlMon.CoInternetSetFeatureEnabled(FEATURE.BEHAVIORS, INTERNETSETFEATURE.ON_PROCESS, false);
//Turn off the annoying click sound that occurs if a browser navigation occurs in an embedded control
UrlMon.CoInternetSetFeatureEnabled(FEATURE.DISABLE_NAVIGATION_SOUNDS, INTERNETSETFEATURE.ON_PROCESS, true);
}
