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(C++) Punycode Encoding / DecodingPunycode is an encoding standard for representing Unicode characters using only the 7bit us-ascii characters that are permitted in network host names. Punycode is used for internationalized domain names -- i.e. IDN or IDNA (Internationalizing Domain Names in Applications). Punycode is defined in RFC 3492. Converting to/from punycode does not include the "xn--" prefix. The "xn--" prefix is to signify that punycode follows. For example, the string " café.com" is converted to "caf-dma.com" in punycode. The punycode domain name is "xn--caf-dma.com". Converting an email address to punycode would be as follows. Suppose the email address is "coffee@café.com". The punycode representation is "coffee@xn--caf-dma.com". The RFC 3492 punycode representation of "café.com" is simply "caf-dma.com", but the punycode domain name is "xn--caf-dma.com". The "xn--" is a constant. It is the same regardless of the domain. For example, the punycode URL representation of "mañana.com" is "xn--maana-pta.com".
#include <CkString.h> void ChilkatSample(void) { CkString s; s.append("café"); s.punyEncode(); std::cout << s.getString() << "\r\n"; s.prepend("xn--"); s.append(".com"); std::cout << s.getString() << "\r\n"; s.replaceFirstOccurance("xn--",""); s.replaceFirstOccurance(".com",""); s.punyDecode(); std::cout << s.getString() << "\r\n"; // The output is: // // caf-dma // xn--caf-dma.com // café // } |
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