一个URL编码和解码的C++类

#pragma once

#include <iostream>

#include <string>

#include <windows.h>

using namespace std;

class strCoding

{

public:

    strCoding(void);

    ~strCoding(void);

    void UTF_8ToGB2312(string &pOut, char *pText, int pLen);//utf_8转为gb2312

    void GB2312ToUTF_8(string& pOut,char *pText, int pLen); //gb2312 转utf_8

    string UrlGB2312(char * str);                           //urlgb2312编码

    string UrlUTF8(char * str);                             //urlutf8 编码

    string UrlUTF8Decode(string str);                  //urlutf8解码

    string UrlGB2312Decode(string str);                //urlgb2312解码

private:

    void Gb2312ToUnicode(WCHAR* pOut,char *gbBuffer);

    void UTF_8ToUnicode(WCHAR* pOut,char *pText);

    void UnicodeToUTF_8(char* pOut,WCHAR* pText);

    void UnicodeToGB2312(char* pOut,WCHAR uData);

    char  CharToInt(char ch);

    char StrToBin(char *str);

};

#include "StdAfx.h"

#include "./urlcodeing.h"

//这是个类strCoding (strCoding.cpp文件)

strCoding::strCoding(void)

{

}

strCoding::~strCoding(void)

{

}

void strCoding::Gb2312ToUnicode(WCHAR* pOut,char *gbBuffer)

{

    ::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);

    return;

}

void strCoding::UTF_8ToUnicode(WCHAR* pOut,char *pText)

{

    char* uchar = (char *)pOut;

    uchar[1] = ((pText[0] & 0x0F) << 4) + ((pText[1] >> 2) & 0x0F);

    uchar[0] = ((pText[1] & 0x03) << 6) + (pText[2] & 0x3F);

    return;

}

void strCoding::UnicodeToUTF_8(char* pOut,WCHAR* pText)

{

    // 注意 WCHAR高低字的顺序,低字节在前，高字节在后

    char* pchar = (char *)pText;

    pOut[0] = (0xE0 | ((pchar[1] & 0xF0) >> 4));

    pOut[1] = (0x80 | ((pchar[1] & 0x0F) << 2)) + ((pchar[0] & 0xC0) >> 6);

    pOut[2] = (0x80 | (pchar[0] & 0x3F));

    return;

}

void strCoding::UnicodeToGB2312(char* pOut,WCHAR uData)

{

    WideCharToMultiByte(CP_ACP,NULL,&uData,1,pOut,sizeof(WCHAR),NULL,NULL);

    return;

}

//做为解Url使用

char strCoding:: CharToInt(char ch){

        if(ch>='0' && ch<='9')return (char)(ch-'0');

        if(ch>='a' && ch<='f')return (char)(ch-'a'+10);

        if(ch>='A' && ch<='F')return (char)(ch-'A'+10);

        return -1;

}

char strCoding::StrToBin(char *str){

        char tempWord[2];

        char chn;

        tempWord[0] = CharToInt(str[0]);                         //make the B to 11 -- 00001011

        tempWord[1] = CharToInt(str[1]);                         //make the 0 to 0  -- 00000000

        chn = (tempWord[0] << 4) | tempWord[1];                //to change the BO to 10110000

        return chn;

}

//UTF_8 转gb2312

void strCoding::UTF_8ToGB2312(string &pOut, char *pText, int pLen)

{

     char buf[4];

     char* rst = new char[pLen + (pLen >> 2) + 2];

    memset(buf,0,4);

    memset(rst,0,pLen + (pLen >> 2) + 2);

    int i =0;

    int j = 0;

    while(i < pLen)

    {

        if(*(pText + i) >= 0)

        {

            rst[j++] = pText[i++];

        }

        else                

        {

            WCHAR Wtemp;

            UTF_8ToUnicode(&Wtemp,pText + i);

            UnicodeToGB2312(buf,Wtemp);

            unsigned short int tmp = 0;

            tmp = rst[j] = buf[0];

            tmp = rst[j+1] = buf[1];

            tmp = rst[j+2] = buf[2];

            //newBuf[j] = Ctemp[0];

            //newBuf[j + 1] = Ctemp[1];

            i += 3;   

            j += 2;  

        }

  }

    rst[j]='/0';

   pOut = rst;

    delete []rst;

}

//GB2312 转为 UTF-8

void strCoding::GB2312ToUTF_8(string& pOut,char *pText, int pLen)

{

    char buf[4];

    memset(buf,0,4);

    pOut.clear();

    int i = 0;

    while(i < pLen)

    {

        //如果是英文直接复制就可以

        if( pText[i] >= 0)

        {

            char asciistr[2]={0};

            asciistr[0] = (pText[i++]);

            pOut.append(asciistr);

        }

        else

        {

            WCHAR pbuffer;

            Gb2312ToUnicode(&pbuffer,pText+i);

            UnicodeToUTF_8(buf,&pbuffer);

            pOut.append(buf);

            i += 2;

        }

    }

    return;

}

//把str编码为网页中的 GB2312 url encode ,英文不变，汉字双字节  如%3D%AE%88

string strCoding::UrlGB2312(char * str)

{

    string dd;

    size_t len = strlen(str);

    for (size_t i=0;i<len;i++)

    {

        if(isalnum((BYTE)str[i]))

        {

            char tempbuff[2];

            sprintf(tempbuff,"%c",str[i]);

            dd.append(tempbuff);

        }

        else if (isspace((BYTE)str[i]))

        {

            dd.append("+");

        }

        else

        {

            char tempbuff[4];

            sprintf(tempbuff,"%%%X%X",((BYTE*)str)[i] >>4,((BYTE*)str)[i] %16);

            dd.append(tempbuff);

        }

    }

    return dd;

}

//把str编码为网页中的 UTF-8 url encode ,英文不变，汉字三字节  如%3D%AE%88

string strCoding::UrlUTF8(char * str)

{

    string tt;

    string dd;

    GB2312ToUTF_8(tt,str,(int)strlen(str));

    size_t len=tt.length();

    for (size_t i=0;i<len;i++)

    {

        if(isalnum((BYTE)tt.at(i)))

        {

            char tempbuff[2]={0};

            sprintf(tempbuff,"%c",(BYTE)tt.at(i));

            dd.append(tempbuff);

        }

        else if (isspace((BYTE)tt.at(i)))

        {

            dd.append("+");

        }

        else

        {

            char tempbuff[4];

            sprintf(tempbuff,"%%%X%X",((BYTE)tt.at(i)) >>4,((BYTE)tt.at(i)) %16);

            dd.append(tempbuff);

        }

    }

    return dd;

}

//把url GB2312解码

string strCoding::UrlGB2312Decode(string str)

{

   string output="";

        char tmp[2];

        int i=0,idx=0,ndx,len=str.length();

        while(i<len){

                if(str[i]=='%'){

                        tmp[0]=str[i+1];

                        tmp[1]=str[i+2];

                        output += StrToBin(tmp);

                        i=i+3;

                }

                else if(str[i]=='+'){

                        output+=' ';

                        i++;

                }

                else{

                        output+=str[i];

                        i++;

                }

        }

        return output;

}

//把url utf8解码

string strCoding::UrlUTF8Decode(string str)

{

     string output="";

    string temp =UrlGB2312Decode(str);//

    UTF_8ToGB2312(output,(char *)temp.data(),strlen(temp.data()));

    return output;

}