Byte Array to Bitmap Image

Question

I made this code to receive an image and convert it to bitmap image but it doesn't work.

Here is the code:

public void ReceiveImage()
{
    NetworkStream stream = new NetworkStream(socket);
    byte[] data = new byte[4];
    stream.read(data,0,data.length,0)
    int size = BitConverter.ToInt32(data,0);
    data = new byte[size];
    stream.read(data,0,data.length)
    MemoryStream imagestream = new MemoryStream(data);
    Bitmap bmp = new Bitmap(imagestream);
    picturebox1.Image = bmp;
}

It gets to:

Bitmap bmp = new Bitmap(imagestream);

And gives me this error:

Parameter is not valid

@Tarek...is this C# Code? When I copy it into Visual Studio, it has some typos. — MikeTWebb
– MikeTWebb, Commented Jul 30, 2012 at 22:11
yes its C# , but you have to type using System.IO; using System.Net.Sockets; using System.Net; — Tarek Adel
– Tarek Adel, Commented Jul 30, 2012 at 22:14
Parameter is not valid is given when the parameter is not a valid image. I assume there is some issue with the way you are reading the file — David Esteves
– David Esteves, Commented Jul 30, 2012 at 22:20

morishuz · Accepted Answer · 2013-04-30 12:55:52Z

9

This is an alternative method

int w= 100;
int h = 200;
int ch = 3; //number of channels (ie. assuming 24 bit RGB in this case)

byte[] imageData    = new byte[w*h*ch]; //you image data here
Bitmap bitmap       = new Bitmap(w,h,PixelFormat.Format24bppRgb);
BitmapData bmData   = bitmap.LockBits(new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat);
IntPtr pNative      = bmData.Scan0;
Marshal.Copy(imageData,0,pNative,w*h*ch);
bitmap.UnlockBits(bmData);

answered Apr 30, 2013 at 12:55

morishuz

2,4224 gold badges22 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

L.B · Accepted Answer · 2012-07-30 22:33:04Z

1

You are probably not receiving enough bytes in stream.read(data,0,data.length) since Read does not ensure that it will read data.length bytes. you have to check its return value and continue to read till data.Length bytes are read.

See : Stream.Read Method's return value

int read = 0;
while (read != data.Length)
{
    read += stream.Read(data, read, data.Length - read);
}

PS: I am assuming lengths and reads are typos.

edited Jul 30, 2012 at 22:33

answered Jul 30, 2012 at 22:21

L.B

116k20 gold badges189 silver badges229 bronze badges

7 Comments

Tarek Adel Over a year ago

this error happened 'Unable to read data from the transport connection. An operation on a socket could be performed because the system lacked sufficient buffer space or because a queue was full.'

L.B Over a year ago

Check the size. It can be in network byte order. You can try IPAddress.NetworkToHostOrder(BitConverter.ToInt32(data,0))

Tarek Adel Over a year ago

not working, comes to 'data = new byte[size];' then gives me this error 'Arithmetic Operation Resulted in an overflow'

L.B Over a year ago

@TarekAdel What do you expect me to do with so little info shown in your question? OK, I found an explicit bug in your code but I am not a magician. What kind of server/client do you have on the other side of your connection? in which protocol does it send the image?

Tarek Adel Over a year ago

i cant send you the code cuz its more than 800 Chars , how can i send it to you?, if by Facebook, this is my email [email protected]

|

Ali Vojdanian · Accepted Answer · 2012-07-30 22:20:59Z

0

I assume you have a table and want to receive the picture from database.

int cout = ds.Tables["TableName"].Rows.Count;
                if (cout > 0)
                {
                    if (ds.Tables["TableName"].Rows[cout - 1]["Image"] != DBNull.Value)
                    {
                        var data = (byte[])(ds.Tables["TableName"].Rows[cout - 1]["Image"]);
                        var stream = new MemoryStream(data);
                        pictureBox1.Image = Image.FromStream(stream);
                    }
                    else
                    {
                        pictureBox1.Image = null;
                    }
                }

answered Jul 30, 2012 at 22:20

Ali Vojdanian

2,1232 gold badges32 silver badges49 bronze badges

1 Comment

L.B Over a year ago

Your assumption is probably wrong. see the code NetworkStream

Serj-Tm · Accepted Answer · 2012-07-30 22:20:46Z

-1

Try this:

int size = BitConverter.ToInt32(data.Reverse().ToArray(),0);

answered Jul 30, 2012 at 22:20

Serj-Tm

17.1k4 gold badges59 silver badges64 bronze badges

1 Comment

L.B Over a year ago

Try this is just a comment. Try this. This should work because... is an answer.

Collectives™ on Stack Overflow

Byte Array to Bitmap Image

4 Answers 4

Comments

7 Comments

1 Comment

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

7 Comments

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related