C# Image.FromStream Invalid Parameter

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I have a client/server setup that when the client sends the message of screen/ the server takes a screenshot, converts it to a byte[] (array) and sends it to my client. Upon recieving the byte array the client converts it to a stream and back to an image file using Image.FromStream and displays it in a picturebox. When testing this the picturebox shows about and inch of the top of the picture while everything under it becomes a dark grey and then it gives me an error saying "Parameter is not valid". I would like for the picture box to show the entire image. My code is below.

C#

public void UpdateArray(byte[] array)  // update array of bytes
{
    MemoryStream ms = new MemoryStream(array);
    Image returnImage = Image.FromStream(ms);  // <-- Parameter Error comes from here.
    pictureBox1.Image = returnImage;
}

Thank you :)

Posted 15-Feb-10 4:43am

Brown Wigga

Updated 15-Feb-10 5:11am

Toli Cuturicu

v3

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AspDotNetDev · Answer 1 · 2010-02-15T05:38:00

Solution 1

The problem is with the data you load into the byte array. Show what you load into that and I'm sure we can help you. It should be the image data as it would be saved to a file (so, includes header information and such).

Posted 15-Feb-10 5:38am

AspDotNetDev

Brown Wigga · Answer 2 · 2010-02-15T05:58:00

Thanks for the reply. The code I used to load the image into a byte array on the server side is shown below.

if (str == "screen/")
                {
                    int screenWidth = Screen.GetBounds(new Point(0, 0)).Width;
                    int screenHeight = Screen.GetBounds(new Point(0, 0)).Height;
                    Bitmap bmpScreenShot = new Bitmap(screenWidth, screenHeight);
                    Graphics gfx = Graphics.FromImage((Image)bmpScreenShot);
                    gfx.CopyFromScreen(0, 0, 0, 0, new Size(screenWidth, screenHeight));
                    {
                        try
                        {
                            using (MemoryStream ms = new MemoryStream())
                            {
                                bmpScreenShot.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                                byte[] array = ms.ToArray();
                                server.Send(array);
                            }
                        }

If I use those same code snippets all in a single windows form without sending through a socket and to a client it works fine. So im assuming it has something to do with the transfer between server to client. Help is greatly appriciated. Thank you.

AspDotNetDev · Answer 3 · 2010-02-15T10:29:00

Sounds like the problem is with your network code. More than likely, you are not getting all of the data during the transfer. This is pretty common. This would make it so only part of your image gets displayed, because only part of the data made it across the wire. Check the length of the array and that should confirm this (the array will be shorter than you expect).

Brown Wigga · Answer 4 · 2010-02-15T10:27:00

Solution 3

Nevermind I figured it out. The file was too big I guess, instead I split it into several chunks and sent them individualy.

Posted 15-Feb-10 10:27am

Brown Wigga

Updated 15-Feb-10 10:28am

v2

C# Image.FromStream Invalid Parameter

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