I need a library that can URLencode a string/char array.

Now, I can hex encode an ASCII array like here:

But I need something that works with Unicode. Note: On Linux AND on Windows !

CURL has a quite nice:

char *encodedURL = curl_easy_escape(handle,WEBPAGE_URL, strlen(WEBPAGE_URL));

but first, that needs CURL and it also is not unicode capable, as one sees by strlen

2 Answers

//If I read the quest correctly and you want to do this yourself, without using curl I think I have a solution (sssuming UTF-8) and I think this is a conformant and portable way of URL encoding query strings:#include 
         
          #include 
          
           #include 
           
            #include 
            
             #include 
             
              #include 
              
               #include 
               
                namespace { std::string encimpl(std::string::value_type v) { if (isalnum(v)) return std::string()+v; std::ostringstream enc; enc << '%' << std::setw(2) << std::setfill('0') << std::hex << std::uppercase << int(static_cast
                
                 (v)); return enc.str(); }}std::string urlencode(const std::string& url) { // Find the start of the query string const std::string::const_iterator start = std::find(url.begin(), url.end(), '?'); // If there isn't one there's nothing to do! if (start == url.end()) return url; // store the modified query string std::string qstr; std::transform(start+1, url.end(), // Append the transform result to qstr boost::make_function_output_iterator(boost::bind(static_cast
                 
                  (&std::string::append),&qstr,_1)), encimpl); return std::string(url.begin(), start+1) + qstr;} It has no non-standard dependencies other than boost and if you don't like the boost dependency it's not that hard to remove.I tested it using:int main() { const char *testurls[] = { "http://foo.com/bar?abc<>de??90 210fg!\"$%", "http://google.com", "http://www.unicode.com/example?großpösna"}; std::copy(testurls, &testurls[sizeof(testurls)/sizeof(*testurls)], std::ostream_iterator
                  
                   (std::cout,"\n")); std::cout << "encode as: " << std::endl; std::transform(testurls, &testurls[sizeof(testurls)/sizeof(*testurls)], std::ostream_iterator
                   
                    (std::cout,"\n"), std::ptr_fun(urlencode));}Which all seemed to work:http://foo.com/bar?abc<>de??90 210fg!"$%http://google.comhttp://www.unicode.com/example?großpösnaBecomes:http://foo.com/bar?abc%3C%3Ede%3F%3F90%20%20%20210fg%21%22%24%25http://google.comhttp://www.unicode.com/example?gro%C3%9Fp%C3%B6snaWhich squares with these examples