目前的互联网，是属于世界的。越来越多的邮件，编码都是用UTF8。但对于我们习惯还是用ASCII/GB2312来显示／编辑。所以ＵＴＦ８的编码内容需要转换，特地写了一个类，来封装解析的部分。
/**//* UTF8Charset.h */
class CUTF8Charset
{
public:
CUTF8Charset();
virtual ~CUTF8Charset();
public:
static void UTF_8ToGB2312(CString &strOut, char *pText, int pLen);
static void GB2312ToUTF_8(CString &strOut, char *pText, int pLen);
static void UTF_8ToGB2312(char *pOut, char *pText, int pLen);
static void GB2312ToUTF_8(char *pOut, char *pText, int pLen);
// Unicode 转换成UTF-8
static void UnicodeToUTF_8(char* pOut,WCHAR* pText);
// GB2312 转换成 Unicode
static void Gb2312ToUnicode(WCHAR* pOut,char *gbBuffer);
// 把Unicode 转换成 GB2312
static void UnicodeToGB2312(char* pOut, WCHAR* pText);
// 把UTF-8转换成Unicode
static void UTF_8ToUnicode(WCHAR* pOut,char* pText);
};
/**//* UTF8Charset.cpp */
#include "UTF8Charset.h"
CUTF8Charset::CUTF8Charset()
{
}
CUTF8Charset::~CUTF8Charset()
{
}
void CUTF8Charset::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);
}
void CUTF8Charset::UnicodeToGB2312(char* pOut, WCHAR* pText)
{
::WideCharToMultiByte(CP_ACP,NULL,pText,1,pOut,sizeof(WCHAR),NULL,NULL);
}
void CUTF8Charset::Gb2312ToUnicode(WCHAR* pOut, char *gbBuffer)
{
::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);
}
void CUTF8Charset::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));
}
void CUTF8Charset::GB2312ToUTF_8(char *pOut, char *pText, int pLen)
{
char buf[4];
memset(buf,0,4);
int i = 0;
int j = 0;
while(i < pLen)
{
//如果是英文直接复制就可以
if( *(pText + i) >= 0)
{
pOut[j++] = pText[i++];
}
else
{
WCHAR pbuffer;
Gb2312ToUnicode(&pbuffer, pText+i);
UnicodeToUTF_8(buf,&pbuffer);
unsigned short int tmp = 0;
tmp = pOut[j] = buf[0];
tmp = pOut[j+1] = buf[1];
tmp = pOut[j+2] = buf[2];
j += 3;
i += 2;
}
}
pOut[j] = '\0';
}
void CUTF8Charset::UTF_8ToGB2312(char *pOut, char *pText, int pLen)
{
int i =0;
int j = 0;
char Ctemp[3] = "";
while(i < pLen)
{
if(pText[i] > 0)
{
pOut[j++] = pText[i++];
}
else
{
WCHAR Wtemp;
UTF_8ToUnicode(&Wtemp,pText+i);
UnicodeToGB2312(Ctemp,&Wtemp);
pOut[j] = Ctemp[0];
pOut[j + 1] = Ctemp[1];
i += 3;
j += 2;
}
}
pOut[j] = '\0';
}
void CUTF8Charset::GB2312ToUTF_8(CString &strOut, char *pText, int pLen)
{
int nBufferLen = pLen / 2 * 3; //按照全是汉字的情况预留空间
char *rst = new char[nBufferLen];
memset(rst,0,nBufferLen);
GB2312ToUTF_8(rst, pText, pLen);
strOut = rst;
delete [] rst;
rst = NULL;
}
void CUTF8Charset::UTF_8ToGB2312(CString &strOut, char *pText, int pLen)
{
char *rst = new char[pLen];
memset(rst,0,pLen);
UTF_8ToGB2312(rst, pText, pLen);
strOut = rst;
delete [] rst;
rst = NULL;
}posted on 2006-05-12 15:07
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