How do I convert large byte array to base 64 in VB.NET

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I have asked this question before but I got no answer. I am trying to get blob data from oracle and read it, than converting my Byte Array to base 64 so I can display later my image in my web page. But the problem is that my blobs are so huge, each array byte length is more than 1 500 000, so conversion is failed and an image icon is displayed instead of the real image. If I can't convert huge data to base64 is there another way to get images and display them? helps are more than appreciated!

What I have tried:

You can check the link mentioned above

Posted 19-Sep-16 22:21pm

H.AL

Updated 19-Sep-16 22:34pm

Leo Chapiro

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OriginalGriff · Accepted Answer · 2016-09-19T22:34:00

It works for me:

Dim rawData As Byte() = File.ReadAllBytes("D:\Test Data\BigImage.jpg")
Dim base64 As String = Convert.ToBase64String(rawData)
Console.WriteLine("{0}:{1}", rawData.Length, base64.Length)

Gives me:

3489676:4652904

Which is an input image data file twice the size of the ones giving you problems. OK, I'm not reading my data from Oracle - it's coming from a file so I know it's a "large image" - but once it's in an array it's just data as far as the system is concerned.
So I'd start by looking at your code and working out exactly what you are doing, before deciding it's the conversion to base64 that is causing your problem.

"can you try to implement your converted image in img tag ?"

Works fine for me!

byte[] rawData = File.ReadAllBytes(@"D:\Test Data\BigImage.jpg");
string base64 = Convert.ToBase64String(rawData);
Response.Write(string.Format("<img src=\"data:image/jpg;base64,{0}\">", base64));

Dim rawData As Byte() = File.ReadAllBytes("D:\Test Data\BigImage.jpg")
Dim base64 As String = Convert.ToBase64String(rawData)
Response.Write(String.Format("<img src=""data:image/jpg;base64,{0}"">", base64))

Admittedly, my browser doesn't look pretty with a dirty great 3880x4997 image slapped into it, but...it works.