Base64 String posting to URL

Question

I have string of text that needs to be cnoverted to base64 before being posted to a url. Here is my code

  HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
      byte[] postDataBytes = Encoding.UTF8.GetBytes(strCXML);
       string returnValue = System.Convert.ToBase64String(postDataBytes);
       req.Method = "POST";
       req.ContentLength = postDataBytes.Length;
       req.ContentLength = postDataBytes.Length;
       Stream requestStream = req.GetRequestStream();
       requestStream.Write(returnValue,0, postDataBytes.Length);

Problem is i get error on the last line System.IO.Stream.Write(byte[],int,int) returnValue is base64 string cant be used as byte[] needed in stream.writer Any idea how to take that that base64 string called returnvalue and put it to a url thanks

You need to convert the string to a byte[]. This post shows how http://stackoverflow.com/questions/472906/net-string-to-byte-array-c-sharp — Scott Baldwin, Oct 09 '12 at 23:11

score 4 · Answer 1 · edited Oct 09 '12 at 23:12

4

You should convert your base64 string into byte array by Encoding.GetBytes

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
byte[] postDataBytes = Encoding.UTF8.GetBytes(strCXML);
string returnValue = System.Convert.ToBase64String(postDataBytes);

postDataBytes = Encoding.UTF8.GetBytes(returnValue);

req.Method = "POST";
req.ContentLength = postDataBytes.Length;
Stream requestStream = req.GetRequestStream();
requestStream.Write(postDataBytes, 0, postDataBytes.Length);

edited Oct 09 '12 at 23:12

SimpleVar

14,044
4
38
60

answered Oct 09 '12 at 23:10

Viacheslav Smityukh

5,652
4
24
42

+1 for good answer. You forgot to change argument in Write call, so I did that for you. Also removed an unnecessary duplicated line that exists in the source as well. – SimpleVar Oct 09 '12 at 23:13
You should merk it as an ansver – Viacheslav Smityukh Oct 13 '12 at 00:18

score 0 · Accepted Answer · answered Oct 09 '12 at 23:09

You are using a Stream as your requestStream. Stream.Write takes a byte array, not a Base64 string.

I think you are doing it in the wrong order. I would convert strCXML to a Base64 String first then encode it into a byte array to write to the request stream.

Base64 String posting to URL

2 Answers2