asked on

Send/Receive raw data of Bitmap

Hi, I am making a simple streaming video.
I need to turn a lot of bitmap into raw data and send it out using UDP Client.
Then, UDP Server receives the raw data and retrive the bitmap.
There is a simple UDPClient:

UdpClient udpClient = new UdpClient();
Byte[] inputToBeSent = new Byte[256];
inputToBeSent = Encoding.ASCII.GetBytes("RRRRR".ToCharArray());
udpClient.Connect(IPAddress.Parse("127.0.0.1"), 11001);
int nBytesSent = udpClient.Send(inputToBeSent, inputToBeSent.Length);
udpClient.Close();

The bitmap object is created by:
Bitmap bitmapPic = new Bitmap(pictureBox.Image);

What Encoding and Decoding function should I use to generate Bitmap raw data?

ASKER CERTIFIED SOLUTION

vo1d

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vo1d

oh sorry, i just saw, that that example copies the data by using the marshaller class.
so no need for an unsafe method with pointers ;)

SOLUTION

Bob Learned

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ddlam

ASKER

vo1d, so which code could be simplified?

ddlam

ASKER

I am using vb 2005 standard but my aim is make the bmp deliverable as I don't know how to get the raw data of the bitmap and convert the raw data into deliverable format.

Bob Learned

Here is a class to convert to/from an image and a byte array:

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

public class MemoryImage
{

public Image ByteArrayToImage(byte[] buffer, string fileName)
{
MemoryStream ms = new MemoryStream(buffer);
Image img = Image.FromStream(ms);
return img;
}

public byte[] ImageToByteArray(Image img, ImageFormat format)
{
MemoryStream ms = new MemoryStream();
img.Save(ms, format);
return ms.ToArray();
}
}

Bob

vo1d

to get the bytes of your image, you can use thelearnedone's methods.
but i woul recommend in changing the ImageToByteArray method, because it will have some overhead in memory usage by using the method ToArray().
you have the image data in the memorystream and than have to copy teh data into a bytearray.

to use therse methods:

public Bitmap BitmapFromByteArray(byte[] buffer)
{
MemoryStream ms = new MemoryStream(buffer);
Bitmap bmp = Bitmap.FromStream(ms);
return(bmp);
}

public byte[] BitmapToByteArray(Bitmap bmp)
{
Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
System.Drawing.Imaging.BitmapData bmpData = bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly, bmp.PixelFormat);
IntPtr ptr = bmpData.Scan0;

byte[] data= new byte[(bmp.Width * bmp.Height)<<2];
System.Runtime.InteropServices.Marshal.Copy(ptr, data, 0, data.Length);
bmp.UnlockBits(bmpData);
return (data);
}

so thats two methods with which you can work.
as i said before, you should compress that byte array before sending and decompress after receipt but before pushing it into the BitmapFromByteArray method.

ddlam

ASKER

Finally, I use ImageConverter. Thanks all.