Parameter is not valid

Question

User-389597101 posted

Hi

 I have a stream of bytes of an image. I am converting it into the image

Byte[] buffer = Encoding.Default.GetBytes(m_Stream); //   Sorry I can't paste the bytes of image because of its mammoth size)
MemoryStream memorystream = new MemoryStream(buffer);
Image img = Image.FromStream(memorystream);  

 

But on last line I am getting error.

"Parameter is not valid" 

Can anyone please tell me the reason for this.

Am I missing something.

Kindly advice

Regards

Karan 

 

 

 

 

Answer 1

User1672132137 posted

Check below link

http://www.eggheadcafe.com/community/aspnet/6/10019388/hope-this-code-sample-hel.aspx

Answer 2

User-1034726716 posted

This may help:

http://www.codeproject.com/KB/recipes/ImageConverter.aspx

Answer 3

User-389597101 posted
Hi I am using this code Byte[] buffer = UnicodeEncoding.Default.GetBytes(Stream); MemoryStream memorystream = new MemoryStream(buffer); Image img; img.Save(memorystream, System.Drawing.Imaging.ImageFormat.Jpeg); Byte[] ret = memorystream.ToArray(); FileStream fs = new FileStream(@"c:\karan.jpg", FileMode.Create, FileAccess.Write); fs.Write(ret, 0, ret.Length); fs.Flush(); fs.Close(); Here 3rd line of code Image img; Here I want to know how to initialize the Image img. Kindly advice Regards Karan

Answer 4

User-1734134863 posted

Hi,

Based on my research, we could use Bitmap and MemoryStream to create the image.

        SqlCommand com = new SqlCommand("select imgdata from table where id=1", con); //read the bytes data from database
        SqlDataReader dr = com.ExecuteReader();
        dr.Read();
        MemoryStream ms = new MemoryStream((Byte[])dr["imgdata"]);    
        Bitmap image = new Bitmap(ms); //create bitmap
        image.Save("test.jpg"); //save the image
        dr.Close();

 

 

Please feel free to let me know if I’ve misunderstood anything.

 

Answer 5

User-1166471706 posted

Hi,

string strfn = Convert.ToString(DateTime.Now.ToFileTime());

FileStream fs = new FileStream(strfn, FileMode.Create);

byte[] btImage = assign from DB

if (btImage !=null )

{

fs.Write(btImage, 0, btImage.Length);

}

// U can either convert as Image / Bitmap, based on ur need... In case if image type is needed then use Image Class instead of BitMap class.

if (fs.Length > 0)

{

Bitmap bmp = new Bitmap(fs);

bmp.Save(Server.MapPath("Images/Temp.jpg"));

imgEmp.ImageUrl = "Images/Temp.jpg";

}

Answer 6

User-578859172 posted

It would seem the stream data is not a valid image. In any case why are you creating a memorystream from a byte array created from ANOTHER STREAM instead of just using m_Stream directly with Image.FromStream!?

Try using Image.FromStream(m_Stream, false, false) to skip image data validation.

Answer 7

User1344168137 posted

Same Problem i too Face.... while saving the Msagl Graph in .jpg file format... but i have save it as .EMF or .WMF  file format...

what's the problem to save .jpg file format??

Answer 8

User-578859172 posted

I don't know what your code looks like, but looking at the OP again it's clear what the problem with that was: It uses a text encoding to get the bytes, presumably reading the file using a StreamReader. Thus the bytes obtained aren't actually the raw image bytes, and no longer represent a valid image.

If it is your code that saved the image you cannot open, try opening a .jpg saved with another program first, to get the reading right. If you read the bytes directly from a FileStream (and not a StreamReader) Image.FromStream should work fine.

HTH