The IOS implementation of network transmission text, urlencode, and decode.

Implementation of URL encode and decode

Source code (vs2005 version): http://download.csdn.net/detail/hherima/5108862

You can also download the source code (IOS version): http://download.csdn.net/detail/hherima/5108862

The following is the IOS source code. Change the source file suffix to mm-related VC suffix.

Header file

using namespace std;#include <string.h>#include <iostream>class UrlEncode{public:    NSString* Encode(NSString*src);    NSString* Decode(NSString* src);private:    string HttpUrlDecode(const string& srcUrl);    string HttpUrlEncode(const string& srcUrl);    int hexchar2int(char c);    string UrlEncodeFormat(const unsigned char cValue);    string DecimalToHexString(unsigned int nValue);};

Source File

# Include "urlencode. H "nsstring * urlencode: encode (nsstring * SRC) {string Buf = httpurlencode ([SRC utf8string]); return [nsstring stringwithuf8string: Buf. c_str ()];} // nsstring * urlencode: Decode (nsstring * SRC) {string Buf = httpurldecode ([SRC utf8string]); return [nsstring stringwithuf8string: Buf. c_str ()];} // string urlencode: httpurldecode (const string & srcurl) {string desstr; int length = 0; int flag = 1; unsigned char firstnum = 0; unsigned char secondnum = 0; const char * pchar = srcurl. c_str ();//. PTR (); While (length <srcurl. length () {If (pchar [length] = '%') // & length <srcurl. length ()-2 {// the last digit, need break; If (length = srcurl. length ()-1) {desstr + = pchar [length]; //. append (pchar [length]); break;} // normal shift length ++; firstnum = hexchar2int (pchar [length]); length ++; secondnum = hexchar2int (pchar [length]); If (Firstnum =-1 | secondnum =-1) // checks whether the converted integer is valid {flag = 0; break ;} desstr + = char (firstnum <4) + char (secondnum );//. append (char (firstnum <4) + char (secondnum);} else if (pchar [length] = '+') {desstr + = '';//. append (''); // spaceb} // urlcode that is not a special character, that is, the English character. append directly to string to else {desstr + = pchar [length]; //. append (pchar [length]);} length ++;} If (flag = 0) {return srcurl;} return desstr;} // string urlencode: Httpurlencode (const string & srcurl) {string encodedurl = ""; int length = srcurl. length (); If (length = 0) {return encodedurl;} string sdontencode = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789 -_~. "; // Parse a chars in the urlfor (INT I = 0; I <length; I ++) {char ctofind = srcurl. at (I); If (-1 = sdontencode. find (ctofind, 0) {// char not found encode it. string TMP = urlencodeformat (ctofind); encodedurl. append (TMP);} else if (ctofind = '') {encodedurl + = '+ ';//. append ('+');} else {encodedurl + = ctofind ;//. append (& ctofind, 1) ;}return encodedurl;} // string urlencode: urlencodeformat (const unsign Ed char cvalue) {string TMP; TMP. append ("%"); unsigned int ndiv = cvalue/16; unsigned int nmod = cvalue % 16; TMP. append (decimaltohexstring (ndiv); TMP. append (decimaltohexstring (nmod); Return TMP;} // string urlencode: decimaltohexstring (unsigned int nvalue) {string TMP; If (nvalue <10) TMP + = (char) nvalue + 48); // append (INT) nvalue); else {Switch (nvalue) {case 10: TMP. append ("A"); break; Case 11: TMP. append ("B"); br Eak; Case 12: TMP. append ("C"); break; Case 13: TMP. append ("D"); break; Case 14: TMP. append ("e"); break; Case 15: TMP. append ("F"); break; default: break;} return TMP;}/*** converts the hex character to the corresponding integer * return 0 ~ 15: the conversion is successful.-1 indicates that C is not hexchar */INT urlencode: hexchar2int (char C) {If (C> = '0' & C <= '9') return C-'0 '; else if (C> = 'A' & C <= 'F') return C-'A' + 10; else if (C> = 'A' & C <= 'F') return C-'A' + 10; else return-1 ;}