Re: byte array to image - C# Discussion Boards

harold aptroot8-Jul-09 4:20

8-Jul-09 4:20

How does it send the image as bytes?

Vivek Vijayan8-Jul-09 4:27

8-Jul-09 4:27

i convert the image to bytes and send using socket.send()

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harold aptroot8-Jul-09 4:32

8-Jul-09 4:32

Vivek Vijayan wrote:
convert the image to bytes

Well that is the most important part - How do you convert it?

Vivek Vijayan8-Jul-09 5:01

8-Jul-09 5:01

here is the code

Bitmap bmp = new Bitmap("D:\\screen.Bmp");

bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
byte[] size = ms.ToArray();
sockt.Send(size);

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Vivek Vijayan8-Jul-09 5:09

8-Jul-09 5:09

and the receiving part code is

byte[] data = new byte[1024];
data=receivefile();
System.IO.MemoryStream ms = new System.IO.MemoryStream(data);
try
{
FileStream fs = new FileStream("\\Program Files\\syswifi\\pic\\screen.Bmp", FileMode.Create);
ms.WriteTo(fs);

ms.Flush();
fs.Close();
ms.Close();

i m getting "exception in this code"
pictureBox1.Image = new Bitmap("\\Program Files\\pic\\screen.Bmp");
}
catch(Exception ex)
{
MessageBox.Show("Failed to display" + ex.Message.ToString());
}

i getting "Exception" in the last line
it is not telling what is the exception its displaying just "Exception"

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Vivek Vijayan8-Jul-09 5:13

8-Jul-09 5:13

when i run applicn when it reaches this line "picturebox1.image=new Bitmap("\\Program Files\\pic\\screen.Bmp")" is null

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harold aptroot8-Jul-09 5:15

8-Jul-09 5:15

Maybe it's bigger than 1024 bytes?
Also, why do you use the memorystream .. for nothing? You could write the array directly to the stream (or if File.WriteAllBytes is available, that's even easier)

Vivek Vijayan8-Jul-09 5:23

8-Jul-09 5:23

how do i get byte array from the an image with out using memory stream

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harold aptroot8-Jul-09 5:26

8-Jul-09 5:26

Scanning the pixels, but I was referring to the receiving code, which doesn't use the memory stream for anything other than the WriteTo method

Vivek Vijayan8-Jul-09 5:49

8-Jul-09 5:49

what is the other way...but i m not able to open the image using the code

pictureBox1.Image =new Bitmap("\\Program Files\\pic\\screen.Bmp");

and

pictureBox1.Image =File.Open("\\Program Files\\pic\\screen.Bmp", FileMode.Open, FileAccess.Read));its raising exception "Exception"

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harold aptroot8-Jul-09 6:01

8-Jul-09 6:01

Well if you have that filestream you can just fs.Write(buffer, 0, 1024)
Assigning a stream to the Image property should not even compile though

Vivek Vijayan8-Jul-09 6:09

8-Jul-09 6:09

i m getting exception when i load to picture box

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harold aptroot8-Jul-09 6:20

8-Jul-09 6:20

Are you sure? Maybe you are getting it when you load the bitmap? You'd have to put it on 2 lines to know that.

Vivek Vijayan8-Jul-09 6:32

8-Jul-09 6:32

exception "Exception" is caught on loading the image. why it is happening??
and wht type of exception is this

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Vivek Vijayan8-Jul-09 6:49

8-Jul-09 6:49

sorry the exception is not cought on loading its in ht eline
picturebox1.image=new Bitmap(fs)
where fs is file stream

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Vivek Vijayan8-Jul-09 7:00

8-Jul-09 7:00

NullReferenceException is caught in the line

fs=File.Open("\\Program Files\\pic\\screen.Bmp", FileMode.Open, FileAccess.Read);
pictureBox1.Image =new Bitmap(fs);

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harold aptroot8-Jul-09 7:07

8-Jul-09 7:07

So.. fs is null? AFAIK that can never happen, it would have to give an other exception as detailed here: File.Open on MSDN[^]
I don't know what else?

Vivek Vijayan8-Jul-09 8:16

8-Jul-09 8:16

i don knwo wht is happening,The file is created. that i can see when when i browse the folder. but null reference exception is shown when i run applcn.

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harold aptroot8-Jul-09 8:42

8-Jul-09 8:42

Is the file ok? does it open in, say, paint without error?

Vivek Vijayan8-Jul-09 10:07

8-Jul-09 10:07

no there is error in opening
its telling something like invalid data....how firts i need to convert byte array or memory stream to image....thats the problem persisting.............

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Vivek Vijayan8-Jul-09 18:34

8-Jul-09 18:34

i got it correct!!!!
the error was in writing to file

thanks!!!

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harold aptroot8-Jul-09 3:18