Unity System.Drawing Internal Buffer Overflow Exception

Question

Goal

Get a gif working in unity from a URL, I am currently using the WWW class. I am currently getting a byte[] and converting it to a System.Drawing.Image. This works in the editor but not any build

Error:

"Type Load Exception: Could not load type" System.IO.InternalBufferOverflowException from the assembly "System.Drawing.Image" at line 111

Why?

It has to do with the System.Drawing.Image.FromStream built in method, Unity for some reason doesn't like it. The other options are .FromFile and .FromHBitMap, I dont know how to use HBitMap but going back to my original plan, .FromFile is unusable to me.

Entire Code

using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using UnityEngine;
using System.IO;
using UnityEngine.UI;
using System.Collections;

public class AnimatedGifDrawerBack : MonoBehaviour
{
    public string loadingGifPath;
    public float speed = 1;
    public Vector2 drawPosition;
    public string pName;

    public float width;
    public float height;
    public float percentage;
    public GameObject positionPlaceHolderGO;
    public Vector2 positionPlaceHolder;
    public Text debugText;
    private SpriteImageArray sia;
    private string url;
    private WWW www;
    public bool finishedWWW = false;
    public bool hasWWW = false;
    public bool canOnGUI = false;

    List<Texture2D> gifFrames = new List<Texture2D>();

    void Start()
    {


        percentage = 1.3f;
        positionPlaceHolderGO = GameObject.FindGameObjectWithTag("PBLPlace");
        positionPlaceHolder = positionPlaceHolderGO.transform.position;

    }

    void Update()
    {
        while (hasWWW == false)
        {
            Debug.Log("in while loop");
            if (this.GetComponent<PokemonCreatorBack>().name == "")
            {

            }
            else
            {
                debugText.text = "Name Found";
                url = "www.pkparaiso.com/imagenes/xy/sprites/animados-espalda/" + this.GetComponent<PokemonCreatorBack>().PokemonName.ToLower() + ".gif";

                StartCoroutine(WaitForRequest(positionPlaceHolderGO, url));
                hasWWW = true;
                debugText.text = "hawWWW = true";
            }
        }
    }

    void OnGUI()
    {
        height = (float)Screen.height - 80f / percentage;

        //GUI.DrawTexture (new Rect (Screen.width-width, Screen.height - height, gifFrames [0].width * percentage, gifFrames [0].height * percentage), gifFrames [(int)(Time.frameCount * speed) % gifFrames.Count]);
        if (canOnGUI)
            GUI.DrawTexture(new Rect(positionPlaceHolder.x, positionPlaceHolder.y, gifFrames[0].width * percentage, gifFrames[0].height * percentage), gifFrames[(int)(Time.frameCount * speed) % gifFrames.Count]);

    }

    IEnumerator WaitForRequest(GameObject go, string url)
    {
        www = new WWW(url);
        yield return www;
        if (www.error == null)
        {
            Debug.Log("WWW Ok!: " + www.texture.name);
        }
        else
        {
            Debug.Log("WWW Error: " + www.error);
        }
        debugText.text = "finishedWWW = true";
        finishedWWW = true;
    }

    public System.Drawing.Image ByteArrayToImage(byte[] byteArrayIn)
    {
        if (finishedWWW == false)
        {
            Debug.Log("Called too early");
        }
        if (byteArrayIn == null)
        {
            Debug.Log("Null byte array");
            return null;
        }
        Debug.Log("Bytra array in length: " + byteArrayIn.GetLongLength(0));
        MemoryStream ms = new MemoryStream(byteArrayIn);
        System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);     //MAIN SOURCE OF ERROR HERE
        finishedWWW = true;
        debugText.text = "System.Image Created";
        return returnImage;
    }

    public void loadImage()
    {
        Debug.Log("Called Load Image BACK");
        debugText.text = "Called Load Image BACK";
        System.Drawing.Image gifImage = ByteArrayToImage(www.bytes);


        FrameDimension dimension = new FrameDimension(gifImage.FrameDimensionsList[0]);
        int frameCount = gifImage.GetFrameCount(dimension);
        for (int i = 0; i < frameCount; i++)
        {
            gifImage.SelectActiveFrame(dimension, i);
            Bitmap frame = new Bitmap(gifImage.Width, gifImage.Height);
            System.Drawing.Graphics.FromImage(frame).DrawImage(gifImage, Point.Empty);
            Texture2D frameTexture = new Texture2D(frame.Width, frame.Height);
            for (int x = 0; x < frame.Width; x++)
                for (int y = 0; y < frame.Height; y++)
                {
                    System.Drawing.Color sourceColor = frame.GetPixel(x, y);
                    frameTexture.SetPixel(frame.Width - 1 + x, -y, new Color32(sourceColor.R, sourceColor.G, sourceColor.B, sourceColor.A)); // for some reason, x is flipped
                }
            frameTexture.Apply();
            gifFrames.Add(frameTexture);
        }
        Debug.Log("Starting ON GUI!");
        debugText.text = "Starting OnGUI";
        canOnGUI = true;
    }
}

Thoughts

1. byteArrayIn.GetLongLength(0) returns 80,000 at most.
2. The last debug statement coming through is Called Image Loading BACK.
3. I will write my own fire streamer if necessary, and if it is necessary can someone point me in the write direction for that.
4. I think the main workaround is dealing with the Image.FromStream().
5. There are two of these in the scene.

All thoughts or solutions are welcome, I really just wish I knew how to tackle this error so that I could share it more with the Unity Community.

Answer 1

We faced the same problem this morning.

The app is not finding a type in the System.IO namespace required by System.Drawing.Image.

The missing type has apparently been stripped from the system.dll that is packed during the build process.

To fix this, you need to copy and replace the unity generated System.dll with the original mono System.dll.

In your build, replace projectName_Data\Managed\System.dll with the System.dll found in Unity's mono installation folder:

Editor\Data\Mono\lib\mono\2.0 (relative to the root of the Unity installation folder).

Hope it helps!