C/C++ 字符编码的转换(ut8、gb2312)

有三分代码

strCoding.h

strCoding.cpp

test.cpp

 

*******************************************************************************************************************************

 

//这是个类strCoding (strCoding.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);

};

//这是个类strCoding (strCoding.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);



};

 

 

*******************************************************************************************************************************

//这是个类strCoding (strCoding.cpp文件)
#include "StdAfx.h"

#include ".\strcoding.h"



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;

}

//这是个类strCoding (strCoding.cpp文件)

#include "StdAfx.h"



#include ".\strcoding.h"







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;



}

 

*******************************************************************************************************************************

 

//test
#include "stdafx.h"
#include "strCoding.h"

using namespace std;


int main()
{

     strCoding cfm;
     string keyword="大家好,欢迎你";
     string Temp="";
     string Output="";

     //把关键字做url的utf8编码
     Temp= cfm.UrlUTF8((char *)keyword.data());
     cout<<Temp<<endl;

     //把url的utf8编码的结果解码
     Temp =cfm.UrlUTF8Decode(Temp);
     cout<<Temp<<endl;

     //把关键字做url的gb2312编码
     Temp =cfm.UrlGB2312((char *)keyword.data());
     cout<<Temp<<endl;

     //把url的gb2312编码的结果解码
     Temp =cfm.UrlGB2312Decode(Temp);
     cout<<Temp<<endl;


     //把关键字GB2312转UTF_8

     cfm.GB2312ToUTF_8(Output,(char *)keyword.data(),strlen(keyword.data()));
     cout<<Output<<endl;

     //把GB2312转UTF_8转为中文
     cfm.UTF_8ToGB2312(Temp,(char *)Output.data(),strlen(Output.data()));
     cout<<Temp<<endl;


    //system("pasue");
     getchar();

    return 0;
    //
}