BinaryWrite an Image from a binary string

[Bammer22]

I am trying to BinaryWrite an image from a binary string that I am storing in the web.config file. The image is just a 1x1 pixel gif. I am setting the content type to "image/gif", but the output is just my string. Any suggestions? Code is below

byte[] bytes = Encoding.UTF8.G etBytes(Configu rationSettings. AppSettings["PixelBinaryDat a"].ToString())
httpContext.Res ponse.ContentTy pe = "image/gif";
httpContext.Res ponse.BinaryWri te(bytes)

[mikeb]

Bammer22 wrote:

I am trying to BinaryWrite an image from a binary string that I am storing in the web.config file. The image is just a 1x1 pixel gif. I am setting the content type to "image/gif", but the output is just my string. Any suggestions? Code is below:

byte[] bytes = Encoding.UTF8.G etBytes(Configu rationSettings. AppSettings["PixelBinaryDat a"].ToString());
httpContext.Res ponse.ContentTy pe = "image/gif";
httpContext.Res ponse.BinaryWri te(bytes);

I suspect that the string in the web.config is a hex string. Encoding
that to UTF8 will not give you what you want.

You probably want something like (I'm probably duplicating something in
the framework that I've overlooked):

public static byte [] hex2bin( string s) {
if (s == null) {
throw new ArgumentNullExc eption("s");
}
if ((s.Length % 2) != 0) {
throw new FormatException ("parameter 's' must have an even
number of hex characters");
}

byte [] result = new byte[ (s.Length)/2];

for (int i = 0; i < result.Length; i++) {
result[i] = byte.Parse( s.Substring( i*2, 2),
System.Globaliz ation.NumberSty les.AllowHexSpe cifier);
}

return result;
}
--
mikeb

[Jon Skeet [C# MVP]]

Bammer22 <an*******@disc ussions.microso ft.com> wrote:

Thanks mike,
seems like I have a problem since my string is prefixed with 0x.

So take the substring from position 2 and then pass it into hex2bin...

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
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