CODEWITHSUNDEEP
c#.netimageexceptionmemorystream
Arvind K
Arvind K

Reputation:

Image.FromStream() method returns Invalid Argument exception

I am capturing images from a smart camera imager and receiving the byte array from the camera through socket programming (.NET application is the client, camera is the server).

The problem is that i get System.InvalidArgument exception at runtime.

private Image byteArrayToImage(byte[] byteArray) 
{
    if(byteArray != null) 
    {
        MemoryStream ms = new MemoryStream(byteArray);
        return Image.FromStream(ms, false, false); 
        /*last argument is supposed to turn Image data validation off*/
    }
    return null;
}

I have searched this problem in many forums and tried the suggestions given by many experts but nothing helped.

I dont think there is any problem with the byte array as such because When i feed the same byte array into my VC++ MFC client application, i get the image. But this doesn't somehow work in C#.NET.

Can anyone help me ?

P.S :

Other methods i've tried to accomplish the same task are:

1.

private Image byteArrayToImage(byte[] byteArray)
{
    if(byteArray != null) 
    {
        MemoryStream ms = new MemoryStream();
        ms.Write(byteArray, 0, byteArray.Length);
        ms.Position = 0; 
        return Image.FromStream(ms, false, false);
    }
    return null;
}

2.

private Image byteArrayToImage(byte[] byteArray) 
{
    if(byteArray != null) 
    {
        TypeConverter tc = TypeDescriptor.GetConverter(typeof(Bitmap));
        Bitmap b = (Bitmap)tc.ConvertFrom(byteArray);
        return b;
    }
    return null;
}

None of the above methods worked. Kindly help.

Upvotes: 13

Views: 50867

Answers (10)

Василий
Василий

Reputation: 11

After load from DataBase byteArray has more byte than one image. In my case it was 82.

MemoryStream ms = new MemoryStream();
ms.Write(byteArray, 82, byteArray.Length - 82);
Image image = Image.FromStream(ms);

And for save in the DB I insert 82 byte to begin stream. Properties.Resources.ImgForDB - it is binary file that contain those 82 byte. (I get it next path - Load Image from DB to MemoryStream and save to binary file first 82 byte. You can take it here - https://yadi.sk/d/bFVQk_tdEXUd-A) 

        MemoryStream temp = new MemoryStream();
        MemoryStream ms = new MemoryStream();
        OleDbCommand cmd;
        if (path != "")
        {
            Image.FromFile(path).Save(temp, System.Drawing.Imaging.ImageFormat.Bmp);
            ms.Write(Properties.Resources.ImgForDB, 0, Properties.Resources.ImgForDB.Length);
            ms.Write(temp.ToArray(), 0, temp.ToArray().Length);

        cmd = new OleDbCommand("insert into Someone (first, Second, Third) values (@a,@b,@c)", connP);
        cmd.Parameters.AddWithValue("@a", fio);
        cmd.Parameters.AddWithValue("@b", post);
        cmd.Parameters.AddWithValue("@c", ms.ToArray());
        cmd.ExecuteNonQuery();

Upvotes: 0

supernorbert
supernorbert

Reputation: 111

Image.FromStream() expects a stream that contains ONLY one image!

It resets the stream.Position to 0. I've you have a stream that contains multiple images or other stuff, you have to read your image data into a byte array and to initialize a MemoryStream with that:

Image.FromStream(new MemoryStream(myImageByteArray));

The MemoryStream has to remain open as long as the image is in use.

I've learned that the hard way, too.

Upvotes: 11

Andrey Belykh
Andrey Belykh

Reputation: 2654

Try to use something similar to what is described here https://social.msdn.microsoft.com/Forums/vstudio/en-US/de9ee1c9-16d3-4422-a99f-e863041e4c1d/reading-raw-rgba-data-into-a-bitmap

Image ImageFromRawBgraArray(
    byte[] arr, 
    int charWidth, int charHeight,
    int widthInChars, 
    PixelFormat pixelFormat)
{
    var output = new Bitmap(width, height, pixelFormat);
    var rect = new Rectangle(0, 0, width, height);
    var bmpData = output.LockBits(rect, ImageLockMode.ReadWrite, output.PixelFormat);

    // Row-by-row copy
    var arrRowLength = width * Image.GetPixelFormatSize(output.PixelFormat) / 8;
    var ptr = bmpData.Scan0;
    for (var i = 0; i < height; i++)
    {
        Marshal.Copy(arr, i * arrRowLength, ptr, arrRowLength);
        ptr += bmpData.Stride;
    }

    output.UnlockBits(bmpData);
    return output;
}

Upvotes: 0

Sathiyamoorthi S
Sathiyamoorthi S

Reputation: 11

Try this:

public Image byteArrayToImage(byte[] item)
{          
   Image img=Image.FromStream(new MemoryStream(item)); 
   img.Save(Response.OutputStream, ImageFormat.Gif);
   return img;
}

Hope it helps!

Upvotes: 1

Mohd Aamir Ansari
Mohd Aamir Ansari

Reputation: 1

this code is working

        string query="SELECT * from gym_member where Registration_No ='" + textBox9.Text + "'";

        command = new SqlCommand(query,con);
        ad = new SqlDataAdapter(command);
        DataTable dt = new DataTable();
        ad.Fill(dt);
        textBox1.Text = dt.Rows[0][1].ToString();
        textBox2.Text = dt.Rows[0][2].ToString();
        byte[] img = (byte[])dt.Rows[0][18];
        MemoryStream ms = new MemoryStream(img);

        pictureBox1.Image = Image.FromStream(ms);
        ms.Dispose();

Upvotes: 0

Jose Martin
Jose Martin

Reputation: 41

Maybe the image is embedded in an OLE field and you have to consider the 88 bytes OLE header plus payload:

byteBlobData = (Byte[]) reader.GetValue(0);
stream = new MemoryStream(byteBlobData, 88, byteBlobData.Length - 88);
img = Image.FromStream(stream);

Upvotes: 4

NotDan
NotDan

Reputation: 32213

I've had this problem when doing this:

MemoryStream stream = new MemoryStream();
screenshot.Save(stream, ImageFormat.Png);
byte[] bytes = new byte[stream.Length];
stream.Save(bytes, 0, steam.Length);

With the last 2 lines being the problem. I fixed it by doing this:

MemoryStream stream = new MemoryStream();
screenshot.Save(stream, ImageFormat.Png);
byte[] bytes = stream.ToArray();

And then this worked:

MemoryStream stream = new MemoryStream(bytes);
var newImage = System.Drawing.Image.FromStream(stream);
stream.Dispose();

Upvotes: 3

lc.
lc.

Reputation: 116458

I'm guessing that something is going wrong when receiving the file from the server. Perhaps you're only getting part of the file before trying to convert it to an Image? Are you sure it's the exact same byte array you're feeding the C++ application?

Try saving the stream to a file and see what you get. You might be able to uncover some clues there.

You can also add a breakpoint and manually compare some of the bytes in the byte array to what they're supposed to be (if you know that).

Edit: It looks like there's nothing wrong with receiving the data. The problem is that it's in raw format (not a format that Image.FromStream understands). The Bitmap(Int32, Int32, Int32, PixelFormat, IntPtr) constructor may be of use here. Or, you can create the blank bitmap and blt it manually from the raw data.

Upvotes: 3

Chris
Chris

Reputation: 40633

I've had the same problem in the past and it was caused by a leak within the windows GDI libraries, which is what 'Bitmap' uses. If this happening all the time for you then its probably unrelated, however.

Upvotes: 0

Mitch Wheat
Mitch Wheat

Reputation: 300549

System.InvalidArgument means The stream does not have a valid image format, i.e. an image type that is not supported.

Upvotes: 1

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