【转】一个URL编码和解码的C++类

下面的代码实现了一个用于C++中转码的类strCoding。里面有UTF8、UNICODE、GB2312编码的互相转换。

.H文件：

#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);

};

　　.cpp

#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,,pOut,);
    return;
}
void strCoding::UTF_8ToUnicode(WCHAR* pOut,char *pText)
{
    char* uchar = (char *)pOut;

    uchar[] = ((pText[] & 0x0F) << ) + ((pText[] >> ) & 0x0F);
    uchar[] = ((pText[] & 0x03) << ) + (pText[] & 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[] = (0xE0 | ((pchar[] & 0xF0) >> ));
    pOut[] = (0x80 | ((pchar[] & 0x0F) << )) + ((pchar[] & 0xC0) >> );
    pOut[] = (0x80 | (pchar[] & 0x3F));

    return;
}
void strCoding::UnicodeToGB2312(char* pOut,WCHAR uData)
{
    WideCharToMultiByte(CP_ACP,NULL,&uData,,pOut,sizeof(WCHAR),NULL,NULL);
    return;
}

//做为解Url使用
char strCoding:: CharToInt(char ch){
        if(ch>='' && ch<='')return (char)(ch-'');
        if(ch>='a' && ch<='f')return (char)(ch-'a'+);
        if(ch>='A' && ch<='F')return (char)(ch-'A'+);
        return -;
}
char strCoding::StrToBin(char *str){
        char tempWord[];
        char chn;

        tempWord[] = CharToInt(str[]);                         //make the B to 11 -- 00001011
        tempWord[] = CharToInt(str[]);                         //make the 0 to 0 -- 00000000

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

        return chn;
}

//UTF_8 转gb2312
void strCoding::UTF_8ToGB2312(string &pOut, char *pText, int pLen)
{
     char buf[];
     char* rst = new char[pLen + (pLen >> ) + ];
    memset(buf,,);
    memset(rst,,pLen + (pLen >> ) + );

    int i =;
    int j = ;

    while(i < pLen)
    {
        if(*(pText + i) >= )
        {

            rst[j++] = pText[i++];
        }
        else
        {
            WCHAR Wtemp;

            UTF_8ToUnicode(&Wtemp,pText + i);

            UnicodeToGB2312(buf,Wtemp);

            unsigned short int tmp = ;
            tmp = rst[j] = buf[];
            tmp = rst[j+] = buf[];
            tmp = rst[j+] = buf[];

            //newBuf[j] = Ctemp[0];
            //newBuf[j + 1] = Ctemp[1];

            i += ;
            j += ;
        }

}
    rst[j]='\0';
   pOut = rst;
    delete []rst;
}

//GB2312 转为 UTF-8
void strCoding::GB2312ToUTF_8(string& pOut,char *pText, int pLen)
{
    char buf[];
    memset(buf,,);

    pOut.clear();

    int i = ;
    while(i < pLen)
    {
        //如果是英文直接复制就可以
        if( pText[i] >= )
        {
            char asciistr[]={};
            asciistr[] = (pText[i++]);
            pOut.append(asciistr);
        }
        else
        {
            WCHAR pbuffer;
            Gb2312ToUnicode(&pbuffer,pText+i);

            UnicodeToUTF_8(buf,&pbuffer);

            pOut.append(buf);

            i += ;
        }
    }

    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=;i<len;i++)
    {
        if(isalnum((BYTE)str[i]))
        {
            char tempbuff[];
            sprintf(tempbuff,"%c",str[i]);
            dd.append(tempbuff);
        }
        else if (isspace((BYTE)str[i]))
        {
            dd.append("+");
        }
        else
        {
            char tempbuff[];
            sprintf(tempbuff,"%%%X%X",((BYTE*)str)[i] >>,((BYTE*)str)[i] %);
            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=;i<len;i++)
    {
        if(isalnum((BYTE)tt.at(i)))
        {
            char tempbuff[]={};
            sprintf(tempbuff,"%c",(BYTE)tt.at(i));
            dd.append(tempbuff);
        }
        else if (isspace((BYTE)tt.at(i)))
        {
            dd.append("+");
        }
        else
        {
            char tempbuff[];
            sprintf(tempbuff,"%%%X%X",((BYTE)tt.at(i)) >>,((BYTE)tt.at(i)) %);
            dd.append(tempbuff);
        }

    }
    return dd;
}
//把url GB2312解码
string strCoding::UrlGB2312Decode(string str)
{
   string output="";
        char tmp[];
        int i=,idx=,ndx,len=str.length();

        while(i<len){
                if(str[i]=='%'){
                        tmp[]=str[i+];
                        tmp[]=str[i+];
                        output += StrToBin(tmp);
                        i=i+;
                }
                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;

}