convert base64 string into byte array & display image in jpeg format

Question

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C#

String RightIris="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";


public void TestLeftFingure()
 {
 byte[] b = Convert.FromBase64String(RightIris);
 MemoryStream ms = new MemoryStream();
 ms = new MemoryStream(b);
 //ms.Write(b, 0, b.Length);
 // pictureBox4.Image.Save(@"C:/Photo/LeftFingure", System.Drawing.Imaging.ImageFormat.Jpeg);
 Image img = Image.FromStream(ms);
 pictureBox4.Image = img;
 pictureBox4.Image.Save(@"C:/Photo/LeftFingure", ImageFormat.Jpeg);
  
 }

call this method in button click()

C#

{
TestLeftFingure();

}

it show the error:perameter is not valid

[edit]Code block added - OriginalGriff[/edit]

Posted 19-Mar-12 21:40pm

leeja ddd

Updated 19-Mar-12 21:53pm

OriginalGriff

v2

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OriginalGriff · Answer 1 · 2012-03-19T21:52:00

Since the error will be on the line:

C#

ms = new MemoryStream(b);

You need to look at the code you used to generate the RightIris string value. A quick check with a hex editor says it is not a JPEG image even when converted from Base64 - it lacks a JPEG header. Since the rest of the code it referencing .jpeg files, I assume it should be one as well.