So I have this piece of code to decode Base64 string:
public void Base64ToImage(string base64String)
{
byte[] bytes = Convert.FromBase64String(base64String);
Image image;
using (MemoryStream ms = new MemoryStream(bytes))
{
image = Image.FromStream(ms);
}
}
But it gives me the error: " Image does not contain a definition for ‘ForStream’ [Assembly-CSharp]
I can’t find a solution for that. I’ve included ‘using System.Drawing’ but it appears that it is not being used.
I’m struggling with the decoding process so any help would be appreciated
Thanks!
Well, @Kurt-Dekker beat me to it, but he gave you links to how you convert a byte array into a texture. If that isn’t what you want to do, then you might want to explain what you need.
Okay let’s be as clear as possible. I am downloading a JSON file that contains two strings (Images converted to base64). Then I use a foreach to loop through those 2 Images-base64. Here’s is the code:
using (var webClient = new System.Net.WebClient())
{
var json = webClient.DownloadString("https://storage.googleapis.com/example/Levels.json");
string[] jsondec = JsonHelper.FromJson<string>(json);
s = jsondec; //s is a string[]
}
foreach (string str in s)
{
byte[] decodedBytes = System.Text.Encoding.UTF8.GetBytes(str);
Texture2D tex = new Texture2D(256, 256);
tex.LoadRawTextureData(decodedBytes);
GameObject go = Instantiate(buttonPrefab);
Button b = go.AddComponent<Button>();
go.GetComponent<RawImage>().texture = tex;
byte[] bb = tex.EncodeToPNG();
System.IO.File.WriteAllBytes("R:/Documents/Unity Projects/testing1/" + "Image" + ".png", bb);
}
As u can see, I’m getting images from a json file and trying to pass them in dynamically created buttons
In debug mode it seems to be crashing on tex.LoadRawTextureData and saving the Image is giving me an image of a question mark. Have a look at this and let me know and explain further because I need to solve this. Thank you very very much
The JsonHelper is a custom class for encoding and decoding Saving the image is just for helping purpose, i will not actually add it
I’ve previously encoded the images into byte array and base64 strings and then put them in a JSON file that i uploaded and then download with a web client as shown above. Here is the full code for everyone:
public void EncodeImages()
{
string[] base64imagesarray; //The array that i will write into the JSON file later
List<string> base64images = new List<string>();
string[] allfiles = Directory.GetFiles("C:/xampp/htdocs/Directory/");
foreach (string s in allfiles)
{
byte[] imageArray = System.IO.File.ReadAllBytes(@s);
string base64ImageRepresentation = Convert.ToBase64String(imageArray);
base64images.Add(base64ImageRepresentation);
}
base64imagesarray = base64images.ToArray();
string json = JsonHelper.ToJson(base64imagesarray, true);
List<Texture2D> texlist = new List<Texture2D>();
WriteDataToFile(json);
string[] jsonString = JsonHelper.FromJson<string>(json);
foreach (string s in jsonString)
{
Base64ToImage(s, texlist, JSONdec); //JSONdec is a string[]
}
}
public void Base64ToImage(string base64String, List<Texture2D> list, string[] s)
{
using (var webClient = new System.Net.WebClient())
{
var json = webClient.DownloadString("https://storage.googleapis.com/example/Levels.json");
string[] jsondec = JsonHelper.FromJson<string>(json);
s = jsondec;
}
foreach (string str in s)
{
byte[] decodedBytes = System.Text.Encoding.UTF8.GetBytes(str);
Texture2D tex = new Texture2D(256, 256);
tex.LoadRawTextureData(decodedBytes);
GameObject go = Instantiate(buttonPrefab);
Button b = go.AddComponent<Button>();
go.GetComponent<RawImage>().texture = tex;
}
}
Maybe I’m blind or I don’t understand something but what I see is that you’re converting your images INTO base64, but when you recreate the images in the Base64ToImage I do not see the FromBase64String command anywhere.
byte[] decodedBytes = System.Text.Encoding.UTF8.GetBytes(str);
Texture2D tex = new Texture2D(256, 256);
I think you will need a Convert.FromBase64String somewhere here.
Since you convert the bytearray when you’re encoding, I think you will need to put the System.Text.Encoding.UTF8.GetBytes(str) inside the decode. I guess, but I’m not sure, it’s already 3:30am here and I haven’t sleep yet so I wouldn’t trust my judgement.
I’ve finally managed to make it work on Unity Player with this code:
using (var webClient = new System.Net.WebClient())
{
var json = webClient.DownloadString("https://storage.googleapis.com/test/L.json");
items[] jsondec = JsonHelper.FromJson<items>(json); //items is a custom class with fields of name and base64code
s = jsondec;
}
foreach (items str in s)
{
byte[] imageBytes = Convert.FromBase64String(str.base64code);
Texture2D tex = new Texture2D(256, 256);
tex.LoadImage(imageBytes);
tex.name = str.name;
GameObject go = Instantiate(buttonPrefab);
Button b = go.AddComponent<Button>();
go.GetComponent<RawImage>().texture = tex;
But when I go to my cloud and put an updated L.json or delete it completely, the webclient still downloads the old file (even if it doesn’t exist on the cloud anymore). What could be wrong? If i update the file or delete and wait for some time(maybe half an hour) it works fine and I get the content of the updated file so I guess it has to do something with cache or something
Thanks but i’ve already tried that and something seems to not be working properly. It’s okay though, i’ll just have to wait some time for it to get updated automatically
