Problem with reading byte[] from Stream

[Li Zhang]

I have a problem with reading byte[] from a memory stream. Basically I
want to resize a image and then store them to sql server. Here is part
of the codes. every time I tried to read byte[] from stream, I only got
all 0 byte[], I don't know what is the problem. Please help me to check
my error. Thanks.

httpImageFile = imageFile.Poste dFile;
imageSize = httpImageFile.C ontentLength;
imageContentTyp e = httpImageFile.C ontentType;
imageFileName = httpImageFile.F ileName;
int ExtractPos = imageFileName.L astIndexOf("\\" ) + 1;
imageFileName =
imageFileName.S ubstring(Extrac tPos,imageFileN ame.Length - ExtractPos);
byte[] imageBuffer = new byte[imageSize];
httpImageFile.I nputStream.Read (imageBuffer, 0, imageSize);
System.Drawing. Image msImage =
System.Drawing. Image.FromStrea m(httpImageFile .InputStream);

Bitmap outBitmap = new Bitmap(msImage, new
Size(Int32.Pars e(Configuration Settings.AppSet tings["MaxImageWi dth"].ToString()),
(int)((Int32.Pa rse(Configurati onSettings.AppS ettings["MaxImageWi dth"].ToString())*ms Image.Height)/msImage.Width)) );
System.IO.Strea m thumbnailStream = new System.IO.Memor yStream();
if (httpImageFile. ContentType.ToL ower() == "image/pjpeg")
outBitmap.Save( thumbnailStream ,
System.Drawing. Imaging.ImageFo rmat.Jpeg);
else
outBitmap.Save( thumbnailStream ,
System.Drawing. Imaging.ImageFo rmat.Gif);
image.Width =
Int32.Parse(Con figurationSetti ngs.AppSettings["MaxImageWi dth"].ToString());
image.Height =
(int)((Int32.Pa rse(Configurati onSettings.AppS ettings["MaxImageWi dth"].ToString())*ms Image.Height)/msImage.Width);
byte[] thumbnailBuffer = new byte[(int)thumbnailS tream.Length];
thumbnailStream .Read(thumbnail Buffer, 0,
(int)thumbnailS tream.Length);
image.File = thumbnailBuffer ;

[Mattias Sjögren]

every time I tried to read byte[] from stream, I only got
all 0 byte[], I don't know what is the problem. Please help me to check
my error. Thanks.

You have to "rewind" the stream before reading from it, either by
setting the Position property or calling Seek.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Li Zhang]

Mattias Sjögren wrote:

every time I tried to read byte[] from stream, I only got
all 0 byte[], I don't know what is the problem. Please help me to check
my error. Thanks.

You have to "rewind" the stream before reading from it, either by
setting the Position property or calling Seek.

Mattias

Mattias, Thank you very much! Problem solved! Have a nice weekend!