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UrlEncode & UrlDecode

Posted on 2003-10-24
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Last Modified: 2012-05-04
I need to encode my data and decode so it can be stored in xml.
Thanks,
Dominik
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Question by:Daij-Djan
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Expert Comment

by:jkr
ID: 9615902
Assuming you are on Windows: To encode, use 'InternetCanonicalizeUrl()', to decode use 'InternetCrackUrl()' with the 'ICU_ESCAPE ' flag.
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jkr earned 85 total points
ID: 9615910
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Author Comment

by:Daij-Djan
ID: 9617696
Isnt InternetCrackUrl using URL_COMMPONENTS? Isnt it overkill to also try to split the url.
Especially if it isnt vaild!?
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Assisted Solution

by:DanRollins
DanRollins earned 40 total points
ID: 9619020
It depends upon your needs (or rather the needs of the host to which you are passing data).  I use this simple fn to pass about 1500 bytes of XML to a host and I have been getting away with it for two years:

//-----------------------------------------------------------------------
// URL encoding of XML formdata
//
void DoUrlEncoding( CString& sXml )
{
      CString sRet, sTmp;
      int nLen= sXml.GetLength();
      for ( int j=0; j< nLen; j++ ) {
            char c= sXml[j];
            if ( isalnum(c) || c=='.' || c=='*' || c=='_' ) {
                  sRet+= c;
            }
            //------I was told must convert, but works in clear text
            else if ( c=='<') sRet += '<';
            else if ( c=='>') sRet += '>';
            else if ( c=='/') sRet += '/';
            else if ( c=='\"') sRet += '\"';
            // else if ( c==' ') sRet += ' ';          // I get away with this
            // else if ( c=='%') sRet += "%%";  // and this
            //----------------------------------
            else if ( c==' ') sRet += '+';      // output + for (space)
            else {
                  sTmp.Format( "%%%2.2X", c);     // output %NN (e.g., %C5 ) for other specials
                  sRet += sTmp;
            }
      }
      sXml= sRet;
}
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Author Comment

by:Daij-Djan
ID: 9619095
The host is an app that stores its data as xml.
I write a plugin for it and i need to encode the data it stores and then, also DECODE it once it is passed back to me.

BTW I am almost sure _I_ have to encode %, too...
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