[SOLVED] URI to Bitmap C# ASP.NET

Issue

I am capturing a URI in ASP.NET MVC with webcam.js. I would like to turn this URI to to bitmap in C#. Below is my current code for attempting to parse the URI into a bitmap, but it, but it gives error "Invalid length for a Base-64 char array or string" when creating the byte buffer. I’ve also tried pulling it in as a C# Uri type, but haven’t had any luck.

[HttpPost]
public JsonResult Scan(string file)
{
   Bitmap img = null;
   var matchGroups = Regex.Match(file, @"^data:((?<type>[\w\/]+))?;base64,(?<data>.+)$").Groups;
   var base64Data = matchGroups["data"].Value;
   byte[] byteBuffer = Convert.FromBase64String(base64Data);
   MemoryStream memoryStream = new MemoryStream(byteBuffer);
   memoryStream.Flush();
   memoryStream.Position = 0;
   img = (Bitmap)Bitmap.FromStream(memoryStream);
}

Here is my URI that is posted from the webcam.js object data_uri which renders the image fine in html.

data:image/jpeg;base64,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 q2GiAMgrLbb5Oix4hx4UrBAPgKMD4/ZPYcxOE3ow52oDYa3ERwnNJBjgKIERPgLLak4jCl6f6CzZD/0WTByeVrh3sU8PkRGVnLTVBZITtbgJtMyD5lMc/wCnnKa0kHJ/qo yVCJZIOE3dHlMDjJ9j5SJjjlJuQDyNo55WHu3gCVGST5KcPupq3bQWZjaMrLHQclNMH2KyOQAqpILJN/7JoeI9/usE5hNM xRgB7qkgCSE6lBJnnwVCTMf6rIcWOx 3uqUU wPQZUERPCkD4iCta3eHEGIU5dBwFhLTk3yWiVrjBkrEyOcJmfdNg OVjlMokJjEJjojylJCTnOBnwVLd9AKQWxAWA7YJ5WC4 Fg1TGE42sIQ81CeTCw55MAmVEXychZILc/0VNUOxziRz/RMdUkR7pFxnmU3EqXqLhgZDi0RMgpbyBGY9k0kN58ppcDIlTGe3gSHby7B4CQEAgHlRl4mMpc8cK/yXyFmRDiSkQBysFwJiP1WS4DkJqVcD5MQ1oWA7ER qw4zkYTC8tOFDUlwIfmQCk8yOZWG1NxAOPlYkffKuO5d4CxB0A5gLBdtBgzKY50nJkeyY52YH9VX1hmwTJG4aRzKSjEiMpLNam3CsaZ57apyCZUjH7c 612vghTAtcYXqKzIla4k8SFMIBHha7HlonlPa8uMQArcmuh0bBeCI5S9QAYGVHKdACVvpAPDzKkkmCMKAOz8LJJxGVm9wyVxz8rBfAyT90xz9wglJz8AAqWm SR4JcMJwgclRE4SaZ9kq9IdkhIA/usOMxBUe7wsS6OUX1QiZpxysGoYJymNdBWScY8otegJA8bROUpkRMKKcR4CyH/OErT4VAOcCSDKaS4iI/VNcc84S3geUhm3blwEEY91th2BMytOjWBxK2WvOBz7KJJsZMSRB/smF08HKaQ4zlNJIXPJPtDJJPJSc6fkKMFLdHmFkkvYC3kn2S yROFgHC0qL7CxCd3Cy4zzIKwSYwsExknKWOmCFHslJIgJoMu5wsEuJ9kU3wxscXwBhMcYMCCFhx nKwDtCpQl2TkUZWSRHKYSAcBIkgSparKAQHnmEp2tTC6HD2KwXZIQmu0Mc4wARlNJ98LBfDflNcSeD91ca6Ac4gCVkGDMyoiADz ycId5TcXLKYGXmZymYPwsObCU Fm4 wHAfoksFxaElO2PYzxwN0gqZjtoAJWs10HKlDpHwvapPlEmwHSc4Um 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Thank you for any help!

Solution

[HttpPost]
        public JsonResult Scan(string file)
        {
            byte[] data = Convert.FromBase64String(file.Substring(file.LastIndexOf(',') + 1));
            Image image;
            Bitmap bitmap;
            using (MemoryStream ms = new MemoryStream(data))
            {
                image = Image.FromStream(ms);
                bitmap = new Bitmap(image);
            }
        }

Answered By – Amit

Answer Checked By – Marilyn (BugsFixing Volunteer)

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