Invalid character in a Base-64 string.

Discussion in 'ASP .Net' started by Anton, Aug 10, 2009.

  1. Anton

    Anton Guest

    hi

    asp.net 3.5

    The code below gives a "Invalid character in a Base-64 string." on the
    this code: "byte[] b = Convert.FromBase64String(content);"

    The value I've sent into saveURLToImage has been http://www.vg.no

    using System.Net;
    using System.IO;
    using System.Text;
    private void saveURLToImage(string url)
    {
    if (!string.IsNullOrEmpty(url))
    {
    string content = "";
    WebRequest webRequest = WebRequest.Create(url);
    WebResponse webResponse = webRequest.GetResponse();
    StreamReader sr = new
    StreamReader(webResponse.GetResponseStream(),
    Encoding.GetEncoding("UTF-8"));
    content = sr.ReadToEnd();
    //save to file
    byte[] b = Convert.FromBase64String(content);
    MemoryStream ms = new MemoryStream(b);
    System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
    img.Save(@"c:\pic.jpg",
    System.Drawing.Imaging.ImageFormat.Jpeg);
    img.Dispose();
    ms.Close();
    }
    }

    any ideas what I do wrong?
     
    Anton, Aug 10, 2009
    #1
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  2. Anton

    Hans Kesting Guest

    Anton has brought this to us :
    > hi
    >
    > asp.net 3.5
    >
    > The code below gives a "Invalid character in a Base-64 string." on the
    > this code: "byte[] b = Convert.FromBase64String(content);"
    >
    > The value I've sent into saveURLToImage has been http://www.vg.no
    >
    > using System.Net;
    > using System.IO;
    > using System.Text;
    > private void saveURLToImage(string url)
    > {
    > if (!string.IsNullOrEmpty(url))
    > {
    > string content = "";
    > WebRequest webRequest = WebRequest.Create(url);
    > WebResponse webResponse = webRequest.GetResponse();
    > StreamReader sr = new
    > StreamReader(webResponse.GetResponseStream(), Encoding.GetEncoding("UTF-8"));
    > content = sr.ReadToEnd();
    > //save to file
    > byte[] b = Convert.FromBase64String(content);
    > MemoryStream ms = new MemoryStream(b);
    > System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
    > img.Save(@"c:\pic.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
    > img.Dispose();
    > ms.Close();
    > }
    > }
    >
    > any ideas what I do wrong?


    If you print out that "content", does it look like a valid
    base64-encoded string? Or are you including http headers and such?

    By the way, if you are sure that the contents will be a jpeg image, you
    can save the byte[] directly instead of going through Image.

    Hans Kesting
     
    Hans Kesting, Aug 10, 2009
    #2
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  3. Anton

    Anton Guest

    "Hans Kesting" <> wrote in message
    news:...
    > Anton has brought this to us :
    >> hi
    >>
    >> asp.net 3.5
    >>
    >> The code below gives a "Invalid character in a Base-64 string." on the
    >> this code: "byte[] b = Convert.FromBase64String(content);"
    >>
    >> The value I've sent into saveURLToImage has been http://www.vg.no
    >>
    >> using System.Net;
    >> using System.IO;
    >> using System.Text;
    >> private void saveURLToImage(string url)
    >> {
    >> if (!string.IsNullOrEmpty(url))
    >> {
    >> string content = "";
    >> WebRequest webRequest = WebRequest.Create(url);
    >> WebResponse webResponse = webRequest.GetResponse();
    >> StreamReader sr = new
    >> StreamReader(webResponse.GetResponseStream(),
    >> Encoding.GetEncoding("UTF-8"));
    >> content = sr.ReadToEnd();
    >> //save to file
    >> byte[] b = Convert.FromBase64String(content);
    >> MemoryStream ms = new MemoryStream(b);
    >> System.Drawing.Image img =
    >> System.Drawing.Image.FromStream(ms);
    >> img.Save(@"c:\pic.jpg",
    >> System.Drawing.Imaging.ImageFormat.Jpeg);
    >> img.Dispose();
    >> ms.Close();
    >> }
    >> }
    >>
    >> any ideas what I do wrong?

    >
    > If you print out that "content", does it look like a valid base64-encoded
    > string? Or are you including http headers and such?
    >
    > By the way, if you are sure that the contents will be a jpeg image, you
    > can save the byte[] directly instead of going through Image.
    >
    > Hans Kesting
    >
    >


    I'm not including any http headers that I know...

    I don't know how a base64-coded string should look like, but the result
    generated looks like this, Below I pasted part of the contens (couldn't
    paste the entire contens because it is too large) of the content
    variable.

    content "\n<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01
    Transitional//EN\"\n\"http://www.w3.org/TR/html4/loose.dtd\">\n\n<html>\n<head>\n<title>VG
    Nett - Forsiden</title>\n\n<!-- meta -->\n<meta http-equiv=\"Content-Type\"
    content=\"text/html; charset=utf-8\" />\n<meta name=\"description\"
    content=\"Norges st&oslash;rste nettsted. Oppdateres minutt for minutt
    p&aring; siste nytt innen sport, innenriks, utenriks, og underholdning.\"
    />\n<meta http-equiv=\"refresh\" content=\"600\" />\n<meta
    name=\"verify-v1\" content=\"oMgZtqMwDTFfakZF0gC07RcpEoQ5tDpCEzZQ/w7L04Q=\"
    />\n\n<!-- css -->\n<link rel=\"stylesheet\" type=\"text/css\"
    href=\"http://static.vg.no/css/hovedstyle.css\" />\n<link rel=\"stylesheet\"
    type=\"text/css\" href=\"http://static.vg.no/css/annonser.css\" />\n<link
    rel=\"stylesheet\" type=\"text/css\"
    href=\"http://www.vg.no/drfront/hovedfront/css/front-25.css\" />\n<link
    -landinger \"
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-39/http://www.vg.no/reise/artikkel.php?artid=566255\">Les
    mer &raquo;</a></p>\n<ul>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-39/http://www.vg.no/reise/artikkel.php?artid=556348\">Togloffer
    etter solen </a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-39/http://www.vg.no/reise/artikkel.php?artid=556342\">Ryggsekk
    + tog = pop igjen </a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-39/http://www.vg.no/reise/artikkel.php?artid=556512\">Surfelykke
    p&aring; Spanias s&oslash;rspiss </a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-39/http://www.vg.no/reise/artikkel.php?artid=556519\">Spennende
    grottesafari i Nordland </a></li>\n</ul>\n</div><div
    class=\"helse\">\n<h3><a title=\"G&aring; til Helse-fronten\"
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://www.vg.no/helse\">Helse</a></h3>\n<h4><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-36/http://www.vg.no/helse/svineinfluensa/artikkel.php?artid=566263\">Astmatiske
    barn kan bli nektet &aring; g&aring; p&aring;
    skolen</a></h4>\n<p>HELSEDIREKTORATET (VG Nett) 20 prosent av norske barn
    har en form for astma. I verste fall kan mange...</p>\n<p
    class=\"leshele\"><a title=\"Les hele Astmatiske barn kan bli nektet &aring;
    g&aring; p&aring; skolen\"
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-36/http://www.vg.no/helse/svineinfluensa/artikkel.php?artid=566263\">Les
    mer &raquo;</a></p>\n<ul>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-36/http://www.vg.no/helse/artikkel.php?artid=566240\">For
    late til &aring; l&oslash;pe etter bussen </a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-36/http://www.vg.no/helse/artikkel.php?artid=566226\">Kl&oslash;e
    er ikke smerte </a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://e24.no/boers-og-finans/article3209925.ece\">Hydro
    låner 1 milliard</a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://e24.no/utenriks/article3209845.ece\">Dansk
    verftsgigant stenger dørene</a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://e24.no/boers-og-finans/article3209836.ece\">-
    Nå er tidspunktet for å kjøpe Rec</a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://e24.no/kommentar/e24-kommentar/orjasaeter/article3209829.ece\">Sykelønnsordningen
    er for god</a></li>\n</ul>\n</div><div class=\"teknologi\">\n<h3><a
    title=\"G&aring; til Teknologi-fronten\"
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://www.vg.no/teknologi\">Teknologi</a></h3>\n<h4><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-204/http://www.vg.no/teknologi/artikkel.php?artid=566254\">Spotifys
    genistrek er avsl&oslash;rt </a></h4>\n<p>Musikktjenesten ga bort 20 prosent
    av aksjene i bytte mot plateselskapenes arkiver. ...</p>\n<p
    class=\"leshele\"><a title=\"Les hele Spotifys genistrek er avsl&oslash;rt
    \"
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-204/http://www.vg.no/teknologi/artikkel.php?artid=566254\">Les
    mer &raquo;</a></p>\n<ul>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-144/http://www.vg.no/teknologi/artikkel.php?artid=566222\">HD-krigen
    blusser opp p&aring; ny </a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-41/http://www1.vg.no/spill/artikkel.php?artid=566179\">Spillanmeldelse:
    Godkjent slapstick-krig </a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-41/http://www1.vg.no/spill/artikkel.php?artid=566180\">Spillanmeldelse:
    Suveren svensk slagmark </a></li>\n<li><a
    href=\"http://go.vg.no/cgi-bin/go.cgi/newsflash/http://go.vg.no/cgi-bin/go.cgi/vg-rss-184/http://www.vg.no/teknologi/artikkel.php?artid=556387\">Disse
    kompaktkameraene t&aring;ler sj&oslash;spr&oslash;yt!
    </a></li>\n</ul>\n</div><div class=\"bildespes floatfix\">\n<h3><a
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    href=\"http://www.vg.no/bildespesial/spesial.php\">Bildespesialer</a></h3>\n<ul>\n<li><a
    href=\"http://www.vg.no/bildespesial/spesial.php?id=7010\"
    title=\"Fotballbråk i Molde\"><img
    src=\"http://static.vg.no/bildespesial/7010/1249902997.43219_thumb.jpg\"
    alt=\"\" /><span>Fotballbråk i Molde</span></a></li>\n<li><a
    href=\"http://www.vg.no/bildespesial/spesial.php?id=7009\" title=\"Se
    stjernene på Teen Choice Awards\"><img
    src=\"http://static.vg.no/bildespesial/7009/1249887457.42657_thumb.jpg\"
    alt=\"\" /><span>Se stjernene på Teen Choice Awards</span></a></li>\n<li><a
    href=\"http://www.vg.no/bildespesial/spesial.php?id=7008\" title=\"Disse
    kjemper om å bli Miss Universe 09\"><img
    src=\"http://static.vg.no/bildespesial/7008/1249839558.67503_thumb.jpg\"
    alt=\"\" /><span>Disse kjemper om å bli Miss Universe
    09</span></a></li>\n</ul>\n</div></div> <!-- /newsflash -->\n\n<div
    id=\"footer\">\n<ul>\n<li>[ <a
    href=\"http://go.vg.no/cgi-bin/go.cgi/r-b3/http://www.vg.no/nyheter/\">Nyheter</a>
    ]</li>\n<li>[ <a
    href=\"http://go.vg.no/cgi-bin/go.cgi/r-b3/http://www.vg.no/sport/\">Sport</a>
    ]</li>\n<li>[ <a
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    ]</li>\n<li>[ <a
    href=\"http://go.vg.no/cgi-bin/go.cgi/r-b3/http://www.vg.no/rampelys/\">Rampelys</a>
    ]</li>\n<li>[ <a
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    ]</li>\n<li>[ <a
    href=\"http://go.vg.no/cgi-bin/go.cgi/r-b3/http://www.vg.no/soek/\">S&oslash;k</a>
    ]</li>\n</ul>\n\n<p>Har du henvendelser om denne tjenesten? Ta kontakt med
    v&aring;r <script
    type=\"text/javascript\">mt('119,101,98,109,97,115,116,101,114,64,118,103,46,110,111',
    'vakthavende journalist')</script>.</p>\n<p>Ansvarlig redakt&oslash;r:
    <script type=\"text/javascript\">mt('69, 115, 112, 101, 110, 46, 69, 103,
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    'Espen Egil Hansen');</script>\n / Administrerende direkt&oslash;r: <script
    type=\"text/javascript\">mt('106,111,46,99,104,114,105,115,116,105,97,110,46,111,116,101,114,104,97,108,115,64,118,103,46,110,111',
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    00</p>\n<p class=\"tips\"><strong>TIPS OSS! </strong> SMS til
    <strong>2200</strong> &middot; MMS m/bilde til <strong>2200</strong>
    &middot; Ring <strong>22 00 00 00</strong> &middot; E-post til <script
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    p&aring; eksterne nettsider som det lenkes til.</em></p>\n<p>Kopiering av
    materiale fra VG Nett for bruk annet sted er ikke tillatt uten avtale | <a
    href=\"http://www.vg.no/copyright.hbs\">&copy; 2009 Verdens Gang
    AS</a></p>\n</div> <!-- /footer -->\n</div> <!-- /right_column -->\n\n<div
    id=\"extra\">\n<div class=\"rightad\">\n<script language=\"javascript\"
    type=\"text/javascript\">\nOAS_AD('x09');\n</script>\n</div> <!--
    /rightad -->\n\n<div class=\"rightad\">\n<script language=\"javascript\"
    type=\"text/javascript\">\nOAS_AD('x07');\n</script>\n</div> <!--
    /rightad -->\n\n\n</div> <!-- /extra -->\n</div> <!--
    /wrapper -->\n\n<script type=\"text/javascript\">\nvar seksjon =
    \"Front\";\ngetTMqs('http', 'www.vg.no/'+seksjon, '', 'vg_no', 'no',
    'ISO-8859-15');\n</script>\n\n<noscript><img
    src=\"http://statistik-gallup.net/V11*www.vg.no/Front**vg_no/no/ISO-8859-15//\"
    alt=\"\" /></noscript>\n\n<script type=\"text/javascript\">\n// set the
    active tab in \"siste nytt\"\nvar sisteNytt_activeTab =
    'sistenytt_alle';\n\n// function to swap tabs\nfunction swapSisteNyttTab(to)
    {\n if (sisteNytt_activeTab == to) {\n return false;\n }\n\n
    jQuery(\"#\" + sisteNytt_activeTab + \", #\" +
    to).toggleClass(\"hidden\");\n sisteNytt_activeTab = to;\n\n return
    false;\n}\n\n// add the hidden class to some of the \"sistenytt\" boxes and
    attach events to the tabs\njQuery(\"#sistenytt_nyheter, #sistenytt_sport,
    #sistenytt_rampelys\").toggleClass(\"hidden\");\n\njQuery(\"#sisteNyttAlleTab\").click(function
    () { return
    swapSisteNyttTab('sistenytt_alle'); });\njQuery(\"#sisteNyttNyheterTab\").click(function
    () { return
    swapSisteNyttTab('sistenytt_nyheter'); });\njQuery(\"#sisteNyttSportTab\").click(function
    () { return
    swapSisteNyttTab('sistenytt_sport'); });\njQuery(\"#sisteNyttRampelysTab\").click(function
    () { return
    swapSisteNyttTab('sistenytt_rampelys'); });\n\njQuery(\"#vghovedmeny
    ..menuSection\").click(function() {\n var listElem =
    jQuery(this).next('ol');\n\n if (listElem.css('display') == 'none') {\n
    listElem.css('display', 'block');\n } else {\n
    listElem.css('display', 'none');\n }\n\n
    jQuery(this).children('a').toggleClass('aktiv');\n\n return
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    li:first').show().toggleClass('activeEntry');\n\nsetInterval(function() {\n
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    \"http://logi163\";\nxtsite = \"417915\";\nxtn2 = \"1\"; // level 2
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    degree\n//-->\n</script>\n<script type=\"text/javascript\"
    src=\"http://static.vg.no/xiti/xtcore_vgnett.js\"></script>\n<noscript>\n<img
    width=\"1\" height=\"1\" alt=\"\"
    src=\"http://logi163.xiti.com/hit.xiti?s=417915&s2=1&p=Front&di=&\"
    >\n</noscript>\n</body>\n</html>\n"
     
    Anton, Aug 10, 2009
    #3
  4. Anton

    Hans Kesting Guest

    It happens that Anton formulated :
    > "Hans Kesting" <> wrote in message
    > news:...
    >> Anton has brought this to us :
    >>> hi
    >>>
    >>> asp.net 3.5
    >>>
    >>> The code below gives a "Invalid character in a Base-64 string." on the
    >>> this code: "byte[] b = Convert.FromBase64String(content);"
    >>>
    >>> The value I've sent into saveURLToImage has been http://www.vg.no
    >>>
    >>> using System.Net;
    >>> using System.IO;
    >>> using System.Text;
    >>> private void saveURLToImage(string url)
    >>> {
    >>> if (!string.IsNullOrEmpty(url))
    >>> {
    >>> string content = "";
    >>> WebRequest webRequest = WebRequest.Create(url);
    >>> WebResponse webResponse = webRequest.GetResponse();
    >>> StreamReader sr = new
    >>> StreamReader(webResponse.GetResponseStream(),
    >>> Encoding.GetEncoding("UTF-8"));
    >>> content = sr.ReadToEnd();
    >>> //save to file
    >>> byte[] b = Convert.FromBase64String(content);
    >>> MemoryStream ms = new MemoryStream(b);
    >>> System.Drawing.Image img =
    >>> System.Drawing.Image.FromStream(ms);
    >>> img.Save(@"c:\pic.jpg",
    >>> System.Drawing.Imaging.ImageFormat.Jpeg);
    >>> img.Dispose();
    >>> ms.Close();
    >>> }
    >>> }
    >>>
    >>> any ideas what I do wrong?

    >>
    >> If you print out that "content", does it look like a valid base64-encoded
    >> string? Or are you including http headers and such?
    >>
    >> By the way, if you are sure that the contents will be a jpeg image, you
    >> can save the byte[] directly instead of going through Image.
    >>
    >> Hans Kesting
    >>
    >>

    >
    > I'm not including any http headers that I know...
    >
    > I don't know how a base64-coded string should look like, but the result
    > generated looks like this, Below I pasted part of the contens (couldn't paste
    > the entire contens because it is too large) of the content
    > variable.
    >
    > content "\n<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01
    > Transitional//EN\"\n\"http://www.w3.org/TR/html4/loose.dtd\">\n\n<html>\n<head>\n<title>VG
    > Nett - Forsiden</title>\n\n<!-- meta -->\n<meta http-equiv=\"Content-Type\"
    > content=\"text/html; charset=utf-8\" />\n<meta name=\"description\"
    > content=\"Norges st&oslash;rste nettsted. Oppdateres minutt for minutt
    > p&aring; siste nytt innen sport, innenriks, utenriks, og underholdning.\"


    That is your problem: this is an html page, NOT a base64 encoded image.

    Base64 is an encoding to allow binary contents to be passed through a
    medium that only allows (ASCII) characters.
    See this snippet:

    public class MyClass
    {
    public static void Main()
    {
    string s = "this is an example!";
    byte[] ba = System.Text.Encoding.UTF8.GetBytes(s);
    string b64 = Convert.ToBase64String(ba);
    Console.WriteLine(b64);
    Console.ReadKey();
    }
    }

    What are you trying to do?

    Hans Kesting
     
    Hans Kesting, Aug 10, 2009
    #4
  5. Anton

    Anton Guest

    I'm trying to generate an image based on the contents of an webpage, in
    other words: make a snapshot of the webpage and store it on the server. So
    then I'm trying this code to see if it can help me with that. Not sure this
    is the best approach.
     
    Anton, Aug 10, 2009
    #5
  6. Anton

    Hans Kesting Guest

    Anton formulated on maandag :
    > I'm trying to generate an image based on the contents of an webpage, in other
    > words: make a snapshot of the webpage and store it on the server. So then I'm
    > trying this code to see if it can help me with that. Not sure this is the
    > best approach.


    You can't do it by just dumping the html code in an image, as you found
    out. As I said, the Base64 encoding is just a way to send any list of
    bytes through a system that only onderstands ASCII. It will not
    generate an image from html text supplied.

    To do that, you will need some browser component that renders the html
    supplied. There is an AxWebBrowser component. Maybe you can use that?
    (I have no experience with it).

    see for instance:
    http://www.codeproject.com/KB/cs/webbrowser.aspx

    Hans Kesting
     
    Hans Kesting, Aug 11, 2009
    #6
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