编码转换工具 源码

// Change.cpp: implementation of the CChange class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "CodeChange.h"
#include "Change.h"


#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CChange::CChange()
{

}

CChange::~CChange()
{

}

CString CChange::Encode_ansitounicode(CString str_temp)
{
    CString return_temp; //声明返回变量
    CString szAnsi = str_temp; //要进行转换编码的字符串

    int wcsLen = ::MultiByteToWideChar(CP_ACP, NULL, szAnsi, strlen(szAnsi), NULL, 0); //获得所需空间大小
    wchar_t * wszString = new wchar_t[wcsLen+1]; //声明wchar_t变量,用于保存转换后的值
    ::MultiByteToWideChar(CP_ACP, NULL, szAnsi, strlen(szAnsi), wszString, wcsLen); //进行转换
    wszString[wcsLen] = '\0'; //加上结束符

    char *buf = (char *)malloc(wcsLen*2); //分配空间到变量
    buf =(char *)wszString; //定义变量
    //AfxMessageBox(buf);

    for(int i=0;i<wcsLen*2;i++) //用循环输出信息到编辑框
    {
        str_temp.Format("%2.2x", buf[i]); //转成十六进制格式
        str_temp = str_temp.Right(2); //取右二位
        return_temp = return_temp + str_temp + " "; //用空格隔开
        //AfxMessageBox(return_temp);

    }

//#ifdef _DEBUG
    CFile cFile;
    cFile.Open(_T("ansitounicode.txt"), CFile::modeWrite | CFile::modeCreate);
    //文件开头
    cFile.SeekToBegin();
    //写入内容
    cFile.Write("\xff\xfe", 2);
    cFile.Write(wszString, wcsLen * sizeof(wchar_t));
    cFile.Flush();
    cFile.Close();

//#endif

    delete[] wszString;
    wszString =NULL;
    return return_temp;
}

CString CChange::Encode_unicodetoansi(CString str_temp)
{
    
    CString return_temp; //声明返回变量
    char *endptr; //暂末用到
    char string1[2], string2[2]; //用于存放两个字节

    char *str_char = str_temp.GetBuffer(str_temp.GetLength()); //声明一个指针,指向字符串所映射的内存

    //if(str_temp.GetLength() == 0 || 0 != str_temp.GetLength()%4) //简单的异常处理
    //{
        //AfxMessageBox("You string have lost some letter! Please input again!");
        //return "";
    //}

    wchar_t * wszString = new wchar_t[str_temp.GetLength()/4+1]; //声明wchar_t变量(unsigned short)
    for(int i = 0;i < str_temp.GetLength()/4;i++) //对两个两个数据进行处理
    {
        //memcpy(string1, str_char+4*i, 2); //将str_char中的数据的2个字节复制到string1
        //memcpy(string2, str_char+2+4*i, 2);
        string1[0] = str_temp[i*4];
        string1[1] = str_temp[i*4+1];
        string2[0] = str_temp[i*4+2];
        string2[1] = str_temp[i*4+3];
        CString string3;
        string3.Format("%c%c%c%c", string2[0],string2[1],string1[0],string1[1]);
        //memcpy(string3, string2, 2);
        //memcpy(string3+2, string1, 2); //复制4个字节数据到string3
        long num = strtol(string3, &endptr, 16);
        wszString[i] = num; //转成16进制存入数组
    }
    wszString[str_temp.GetLength()/4] = '\0'; //插入结束符

    int ansiLen = str_temp.GetLength()/4; //目录字符数据大小
    for(int j=0; j < str_temp.GetLength()/4; j++)
    {
        if(wszString[j]>256)
            ansiLen++;
    }

    //int ansiLen = ::WideCharToMultiByte(CP_ACP, NULL, wszString, wcslen(wszString), NULL, 0, NULL, NULL);
    char* szAnsi = new char[ansiLen + 1]; //声明保存数据变量
    ::WideCharToMultiByte(CP_ACP, NULL, wszString, wcslen(wszString), szAnsi, ansiLen, NULL, NULL); //进行转换
    szAnsi[ansiLen] = '\0'; //赋结束符

    return_temp = szAnsi; 

//#ifdef _DEBUG
    CFile cFile;
    cFile.Open(_T("unicodetoansi.txt"), CFile::modeWrite | CFile::modeCreate);
    //文件开头
    cFile.SeekToBegin();
    //写入内容
    cFile.Write(szAnsi, ansiLen * sizeof(char));
    cFile.Flush();
    cFile.Close();

//#endif

    delete[] szAnsi;
    szAnsi =NULL;
    return return_temp;
}

CString CChange::Encode_ansitoutf8(CString str_temp)
{
    CString return_temp; //声明返回变量
    CString szAnsi = str_temp; //要进行转换编码的字符串

    int wcsLen = ::MultiByteToWideChar(CP_ACP, NULL, szAnsi, strlen(szAnsi), NULL, 0); //获得所需空间大小
    wchar_t * wszString = new wchar_t[wcsLen+1]; //声明wchar_t变量,用于保存转换后的值
    ::MultiByteToWideChar(CP_ACP, NULL, szAnsi, strlen(szAnsi), wszString, wcsLen); //进行转换
    wszString[wcsLen] = '\0'; //加上结束符
//到此时wszString里已经是转成unicode编码的数据了,接下来就只要将unicode编成utf-8就可以了

    //wchar_t* wszString = L"中国a"; //测试用的数据
    int u8Len = ::WideCharToMultiByte(CP_UTF8, NULL, wszString, wcslen(wszString),NULL, 0,NULL,NULL); //所需数据大小
    char* szU8 = new char[u8Len+1]; //保存utf-8编码数据
    //UTF8虽然是Unicode的压缩形式，但也是多字节字符串，所以可以以char的形式保存
    //unicode版对应的strlen是wcslen
    ::WideCharToMultiByte(CP_UTF8, NULL, wszString, wcslen(wszString), szU8, u8Len, NULL, NULL); //进行 utf-8转码
    szU8[u8Len] = '\0'; //加上结束符
    //MessageBox不支持UTF8,所以只能写文件
    //return_temp = szU8; //将数据赋给 返回值变量

    for(int i=0;i<u8Len;i++) //用循环输出信息到编辑框
    {
        str_temp.Format("%2.2x", szU8[i]); //转成十六进制格式
        str_temp = str_temp.Right(2); //取右二位
        return_temp = return_temp + str_temp + " "; //用空格隔开
        //AfxMessageBox(return_temp);

    }


//#ifdef _DEBUG
    //写文本文件，UTF8的BOM是0xbfbbef
    CFile cFile;
    cFile.Open(_T("ansitoutf8.txt"), CFile::modeWrite | CFile::modeCreate);
    cFile.SeekToBegin();
    cFile.Write("\xef\xbb\xbf", 3);//写BOM，同样低位写在前
    cFile.Write(szU8, u8Len*sizeof(char));
    cFile.Flush();
    cFile.Close();

//#endif
    delete[] szU8;
    szU8 = NULL;

    return return_temp;
}


CString CChange::Encode_utf8toansi(CString str_temp)
{
    CString return_temp; //声明返回变量
    char *endptr; //暂末用到
    //char* szU8 = "abcd1234\xe4\xbd\xa0\xe6\x88\x91\xe4\xbb\x96\x00"; //测试数据
    char *szU8 = new char[str_temp.GetLength()/2+1]; //存放要转换的数据

    char string1[1]; //用于存放两个字节
    char * str_char  = str_temp.GetBuffer(str_temp.GetLength()); //声明一个指针,指向字符串所映射的内存
    str_temp.ReleaseBuffer(); //释放对象

    for(int i = 0;i < str_temp.GetLength()/2;i++) //两位两位的处理,将字符串转成十六进制存储
    {
        memcpy(string1, str_char+i*2, 2);
        szU8[i] = (char)strtol(string1, &endptr, 16);

    }
    szU8[str_temp.GetLength()/2] = '\0'; //加入结束符
  
    int wcsLen = ::MultiByteToWideChar(CP_UTF8, NULL, szU8, strlen(szU8),NULL, 0); //获取常量大小
    wchar_t* wszString = new wchar_t[wcsLen+1]; //保存数据的变量
    ::MultiByteToWideChar(CP_UTF8, NULL, szU8, strlen(szU8), wszString, wcsLen); //多位转字节
    wszString[wcsLen] = '\0'; //加入结束符

    int ansiLen = ::WideCharToMultiByte(CP_ACP, NULL, wszString, wcslen(wszString), NULL, 0, NULL, NULL); //获取常量大小
    char* szAnsi = new char[ansiLen+1]; //声明保存数据变量
    ::WideCharToMultiByte(CP_ACP, NULL, wszString, wcslen(wszString), szAnsi, ansiLen, NULL, NULL); //进行转换
    szAnsi[ansiLen] = '\0'; //赋结束符
    return_temp = szAnsi; 

//#ifdef _DEBUG
    CFile cFile;
    cFile.Open(_T("utf8toansi.txt"), CFile::modeWrite | CFile::modeCreate);
    //文件开头
    cFile.SeekToBegin();
    //写入内容
    cFile.Write(szAnsi, ansiLen * sizeof(char));
    cFile.Flush();
    cFile.Close();

//#endif

    delete[] szAnsi;
    delete[] szU8;
    szU8 = NULL;
    szAnsi =NULL;
    //AfxMessageBox(return_temp);
    return return_temp;
}