Base64ToImage

Question

My Requirement is i need to convert base64 to encrypted value encrypt value to url url to Image visible when i read the url the image should be display how to do it.

Tuhin Paul · Answer

Hello Jaya, To achieve this requirement in C#, you can try these steps: 1) Convert Base64 to encrypted value: You can use a symmetric encryption algorithm such as AES to encrypt the Base64 string. Here is an example of how you can do this in C#: string base64String = "your-base64-string"; byte[] base64Bytes = Convert.FromBase64String(base64String); // Set a secret key for encryption byte[] key = Encoding.UTF8.GetBytes("your-secret-key"); // Create an instance of the AES encryption algorithm Aes aes = Aes.Create(); aes.Key = key; // Encrypt the Base64 bytes using AES byte[] encryptedBytes = aes.CreateEncryptor().TransformFinalBlock(base64Bytes, 0, base64Bytes.Length); // Convert the encrypted bytes to a Base64 string string encryptedString = Convert.ToBase64String(encryptedBytes); 2) Encrypt value to URL: To encrypt the value to URL, you can use a URL-safe encryption algorithm such as Base64URL. Here is an example of how you can do this in C#: string value = "your-value-to-encrypt"; byte[] valueBytes = Encoding.UTF8.GetBytes(value); // Encrypt the value using Base64URL string base64UrlString = Convert.ToBase64String(valueBytes) .Replace("+", "-") .Replace("/", "_") .Replace("=", ""); // The resulting string is a URL-safe encrypted value 3) URL to Image visible: To make the URL visible as an image, you need to generate an image file from the URL. You can do this by creating a new Bitmap object from the URL and then saving it to a file: string url = "your-url"; Bitmap image = new Bitmap(url); image.Save("path-to-save-image"); 4) Read the URL and display the image: To display the image, you can use a PictureBox control in a Windows Forms application or an Image control in a WPF application. Here is an example of how you can do this in a Windows Forms application: string imageUrl = "your-image-url"; pictureBox1.Load(imageUrl); This will load the image from the URL and display it in the PictureBox control.

Vishal Joshi · Answer

Hello Jaya Please type code like the below sample. public Image LoadImage() { //data:image/gif;base64, //this image is a single pixel (black) byte[] bytes = Convert.FromBase64String("R0lGODlhAQABAIAAAAAAAAAAACH5BAAAAAAALAAAAAABAAEAAAICTAEAOw=="); Image image; using (MemoryStream ms = new MemoryStream(bytes)) { image = Image.FromStream(ms); } return image; } Thanks

Jignesh Kumar · Answer

Helle Jaya prakash, To store encrypted Image, protected void btnImageUpload_Click(object sender, EventArgs e) { //***Convert Image File to Base64 Encoded string***// //Read the uploaded file using BinaryReader and convert it to Byte Array. BinaryReader br = new BinaryReader(FileUpload1.PostedFile.InputStream); byte[] bytes = br.ReadBytes((int)FileUpload1.PostedFile.InputStream.Length); //Convert the Byte Array to Base64 Encoded string. string base64String = Convert.ToBase64String(bytes, 0, bytes.Length); //***Save Base64 Encoded string as Image File***// byte[] imageBytes = Convert.FromBase64String(base64String); //Save the Byte Array as Image File. string filePath = Server.MapPath("~/Files/" + Path.GetFileName(FileUpload1.PostedFile.FileName)); File.WriteAllBytes(filePath, imageBytes); } read this encrypted image from imagepath, protected static string GetBase64StringForImage(string imgPath) { byte[] imageBytes = System.IO.File.ReadAllBytes(imgPath); string base64String = Convert.ToBase64String(imageBytes); return base64String; }

Tuhin Paul · Answer

updated version of the code: public Image LoadImage(string base64String) { try { // Decode the Base64 string into a byte array byte[] bytes = Convert.FromBase64String(base64String); // Load the image from the byte array using (MemoryStream ms = new MemoryStream(bytes)) { return Image.FromStream(ms); } } catch (FormatException ex) { // The input string is not a valid Base64-encoded image Console.WriteLine("Error: " + ex.Message); return null; } catch (Exception ex) { // Handle other exceptions that may occur Console.WriteLine("Error: " + ex.Message); return null; } } This code takes a Base64-encoded string as input and returns an Image object. It uses a try-catch block to handle exceptions and disposes of the MemoryStream object using the using statement.