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!
2
Answers
Your regular expression is incorrect.
The base-64 data starts after
base64,
in the data URI. Note the comma. Your regular expression includes the comma in thedata
capture group. You need to put it outside the capture group: