darkpbj darkpbj -4 years ago 225
C# Question

C# Converting file into Base64String and back again

The title says it all:


  1. I read in a tar.gz archive like so

  2. break the file into an array of bytes

  3. Convert those bytes into a Base64 string

  4. Convert that Base64 string back into an array of bytes

  5. Write those bytes back into a new tar.gz file



I can confirm that both files are the same size (the below method returns true) but I can no longer extract the copy version.

Am I missing something?

Boolean MyMethod(){
using (StreamReader sr = new StreamReader("C:\...\file.tar.gz")) {
String AsString = sr.ReadToEnd();
byte[] AsBytes = new byte[AsString.Length];
Buffer.BlockCopy(AsString.ToCharArray(), 0, AsBytes, 0, AsBytes.Length);
String AsBase64String = Convert.ToBase64String(AsBytes);

byte[] tempBytes = Convert.FromBase64String(AsBase64String);
File.WriteAllBytes(@"C:\...\file_copy.tar.gz", tempBytes);
}
FileInfo orig = new FileInfo("C:\...\file.tar.gz");
FileInfo copy = new FileInfo("C:\...\file_copy.tar.gz");
// Confirm that both original and copy file have the same number of bytes
return (orig.Length) == (copy.Length);
}


EDIT: The working example is much simpler (Thanks to @T.S.):

Boolean MyMethod(){
byte[] AsBytes = File.ReadAllBytes(@"C:\...\file.tar.gz");
String AsBase64String = Convert.ToBase64String(AsBytes);

byte[] tempBytes = Convert.FromBase64String(AsBase64String);
File.WriteAllBytes(@"C:\...\file_copy.tar.gz", tempBytes);

FileInfo orig = new FileInfo(@"C:\...\file.tar.gz");
FileInfo copy = new FileInfo(@"C:\...\file_copy.tar.gz");
// Confirm that both original and copy file have the same number of bytes
return (orig.Length) == (copy.Length);
}


Thanks!

Answer Source

If you want for some reason to convert your file to base-64 string. Like if you want to pass it via internet, etc... you can do this

Byte[] bytes = File.ReadAllBytes("path");
String file = Convert.ToBase64String(bytes);

And correspondingly, read back to file:

Byte[] bytes = Convert.FromBase64String(b64Str);
File.WriteAllBytes(path, bytes);
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