[转]一个URL编码和解码的C++类 -

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[转]一个URL编码和解码的C++类

博客分类：

类转自：http://www.cnblogs.com/xiaoka/articles/2585189.html

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：

[cpp] view plaincopyprint?

    #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文件：

[cpp] view plaincopyprint?

    #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;  
      
    }  


generalhking:在VS2008下编译实验可用，VC6下不可用。

VS08下实验如下：

[cpp] view plaincopyprint?

    // TestUrlClass.cpp : Defines the entry point for the console application.  
    //  
      
    #include "stdafx.h"  
    #include "strCoding.h"  
      
      
    int _tmain(int argc, _TCHAR* argv[])  
    {  
      
        strCoding stdCd;  
        string str = "一只可爱的小花猫，MS输入测试 空格，大学。Hello world，混合编码，HK@hit.edu.cn,#试#，%试，&，+++，、，/、\， =连接，？， . ：请注意：";  
        string urlrlt = stdCd.UrlGB2312((char*)str.c_str());  
        cout<<urlrlt<<endl;  
        string utldec = stdCd.UrlGB2312Decode(urlrlt);  
        cout<<utldec<<endl;  
        system("pause");  
        return 0;  
    }

结果：