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How to convert base64 string to BitmapImage?

Time:01-06

I'm reading data from a blob in MySQL in Base64 String. I want to convert this to a BitmapImage. I've tried many ways, but without success. Here is an example:

    public static BitmapImage Base64ToBitmapImage(this string base64String)
    {
        byte[] binaryData = Convert.FromBase64String(base64String);
        BitmapImage img = new BitmapImage();
        img.BeginInit();
        img.StreamSource = new MemoryStream(binaryData);
        img.EndInit();
        return img;
    }

One example of blob:

iVBORw0KGgoAAAANSUhEUgAAAIwAAACMCAIAAAAhotZpAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAACk0SURBVHhe7d1rjKVVuSfwql33a1d3V99o gJNA7bQNAgeETRxJIQELxgTvOFBHUcP5ggzx8QMyXwymox GIzhgxJzzHxgxKiYyQzjdRAvnAENGkAEmu4G lZ9q66u 65dVbvmt95n1 vuG3ZXV3tq96l/Ksv1rvWstZ7n a/nWevdezfWz8zM1C1iYaNQ d9FLGAsklQDWCSpBrBIUg1gkaQawCJJNYBFkmoAiyTVABZJqgEsklQDWCSpBrBIUg1gkaQawCJJNYBFkmoAC5Sk6enpcrlceairy7/0OuHbrzP5MowMmC1Qaa0pLOgv/cK/USkUCvX19dGeU6ilsbExGkMSQix/hHxgjWLBkYSAaj5yTE1N5XxgiNoNDQ3xeEqQiUlqnSH4VyPpdOuWSiXeDwJCBmdZz79dLDiSIN/7kdZAvaWlRWVyclKvkMKcXuGlXa/ZAnoD2QR/ga4oa5HyfzWSwvUnQyQpuTKYiEYYHBzUFax0d3fnqQ YEHTiRghWj8qtyyuLJJ0FTkfSvn37qMSVbW1tnZ2dzc3NJHGzd 9epS4kaW9vb8eTx2KxGCGljiG90NTUpNFsEVU5Yomaw4Ij6cUXX5TT9PI1Jvh9YmICEx6DjBgYHleiUzswBDeGAOHW1tbohRPCq YwzyTFbOHB8B0HQdaZQCB6 /r6kMGVS5cuJSCbjYyM6FXGQGSQFC5cT0BLDA9EvboFPBoS86PWKMPFYsA8qFqyZEnIQMhX8xfrqhh7Aq/mDx1OyLTKmCoe8/o84nxFkmkDwdDo6KgSJfEoIF599VXxoW7jK8fGxhw5/MKb3ATGMjgcrT0eSSoDUY ufIjGHNGeCJ 9gGgJymNOw1UiPVpXPdcQ7KEI3OiNxkAoowSPSZvzwE2O80JSaJ/vxPARU NxeHhYuKAtiMlpY2d4ymNoFcaHN82Qt1RXREwIR2MIA9dnWlTuFMp4jPshaLGoUcEZTZQUcBZ2ZFDRZQjhmB9MlQ/3GF3RkvWfF5wXksKhQdL4 Dhrs ZUl9Zwwzt6 ZepHAF6sciz/f396mE2ZOMSQs/k5uMrJlexYt4So2JOq SICYOwQNQjYtCjVNdirJAys8YVK1YgL IvZo5pc7aixdJ5fd5xHiOp2gaZ7dixYwMDAyqsRQaq9DKeL8IFfAE9PT3VA/8qwq38KxTC3R6tHrk0yFNGRYslyKhYV7hYl6TdY3hSOou8HDHKZXLZsmXOTpmZqhgyXHu1kiTPSu2zwjyTFLOFrrmdMtvQ0BBWPGpPDssub/ZpZJUgCXI7owzkc ZdUTkBxMDM8cj16lbEXE5etnJqtFZXV5cNQQf00I2G0UUyxGIeG4swDcUWbd07jPIYk4QMeKRV8DfvmE STBWqhxMZz1OHDx9mNmi0i8MwLrA38QQaT3b6yVpFS0hWyyMgHlNGO72PrBgzUEnFEI7GUPTmHrefnJcgFZuZpD2kHsen VFLc2UMVxpFzAxvrMC5YD5J4ghkcHroKoew2ctp0KDLWjbjypUru7u7Q5KYRgMJnGBhrlg1JW AEwyJbRE4ne94Vpnvm1xMu8CSn3ED2k1CQDvEQlu2bIlNpjd2QL475x3znO5CXbrafUcyxA1bi01nV8rveJqDMSfr caaVy9xJsvRvFI7Hm46rqOSnj0XTARnLjgXX3zxunXrWBTz67Uz8thSzsHMU2I SbLLqMUGieLQoUN2oopH201 YAyS8ujRHqPOEDG5SnU5jzgdSYAeCTAyXtwybMHly5fjScbbvHlzb29v5MY8f4LHhUgSRWMfoef1119nD27ojRvnLZJCzIokq 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CodePudding user response:

In my project, I used this method to convert an array of bytes to BitmapImage:

public static BitmapImage? ConvertToBitmapImage(byte[]? imageData)
        {
            if (imageData == null || imageData.Length == 0) return null;
            var image = new BitmapImage();
            using (var mem = new MemoryStream(imageData))
            {
                mem.Position = 0;
                image.BeginInit();
                image.CreateOptions = BitmapCreateOptions.PreservePixelFormat;
                image.CacheOption = BitmapCacheOption.OnLoad;
                image.UriSource = null;
                image.StreamSource = mem;
                image.EndInit();
            }
            image.Freeze();
            return image;
        }

You can use this function by passing an array of bytes to it:

public static BitmapImage? Base64ToBitmapImage(this string base64String)
    {
        byte[] binaryData = Convert.FromBase64String(base64String);
        return ConvertToBitmapImage(binaryData);
    }

CodePudding user response:

The code above works fine. The cause of the problem its on MySQL return. The value from a blob column returns returns as a byte on C# MySQL Lybrary. And I was converting it to a Base64 String and recoverting to a byte.

I excluded this confusion in my code and problem fixed.

CodePudding user response:

you can use this functions.

private string ImageToBase64String(string file)
    {
        Bitmap bitmap = new Bitmap(file);

        MemoryStream ms = new MemoryStream();

        bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

        byte[] arr = new byte[ms.Length];

        ms.Position = 0;
        ms.Read(arr, 0, (int)ms.Length);
        ms.Close();

        string strBase64 = Convert.ToBase64String(arr);

        return strBase64;
    }

   
    private Bitmap Base64StringToImage(string base64)
    {
        byte[] arr = Convert.FromBase64String(base64);
        MemoryStream ms = new MemoryStream(arr);
        Bitmap bitmap = new Bitmap(ms);

        return bitmap;
    }
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