c++字符集之间转换，UTF-8,UNICODE,Gb2312

classCChineseCode{

public:

staticvoidUTF_8ToUnicode(wchar_t* pOut,char*pText);// 把UTF-8转换成Unicode

staticvoidUnicodeToUTF_8(char* pOut,wchar_t* pText);//Unicode 转换成UTF-8

staticvoidUnicodeToGB2312(char* pOut,wchar_tuData);// 把Unicode 转换成 GB2312

staticvoidGb2312ToUnicode(wchar_t* pOut,char*gbBuffer);// GB2312 转换成　Unicode

staticvoidGB2312ToUTF_8(string& pOut,char*pText,intpLen);//GB2312 转为 UTF-8

staticvoidUTF_8ToGB2312(string &pOut,char*pText,intpLen);//UTF-8 转为 GB2312

};

//类实现

voidCChineseCode::UTF_8ToUnicode(wchar_t* 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;

}

voidCChineseCode::UnicodeToUTF_8(char* pOut,wchar_t* 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;

}

voidCChineseCode::UnicodeToGB2312(char* pOut,wchar_tuData){

WideCharToMultiByte(CP_ACP,NULL,&uData,1,pOut,sizeof(wchar_t),NULL,NULL);

return;

}

voidCChineseCode::Gb2312ToUnicode(wchar_t* pOut,char*gbBuffer){

::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);

return;

}

voidCChineseCode::GB2312ToUTF_8(string& pOut,char*pText,intpLen){

charbuf[4];

intnLength = pLen* 3;

char* rst =newchar[nLength];

memset(buf,0,4);

memset(rst,0,nLength);

inti = 0;

intj = 0;

while(i < pLen){

//如果是英文直接复制就能

if( *(pText + i) >= 0){

rst[j++] = pText[i++];

}else{

wchar_tpbuffer;

Gb2312ToUnicode(&pbuffer,pText+i);

UnicodeToUTF_8(buf,&pbuffer);

unsignedshortinttmp = 0;

tmp = rst[j] = buf[0];

tmp = rst[j+1] = buf[1];

tmp = rst[j+2] = buf[2];

j += 3;

i += 2;

}

}

rst[j] = ’’;

//返回结果

pOut = rst;

delete[]rst;

return;

}

voidCChineseCode::UTF_8ToGB2312(string &pOut,char*pText,intpLen){

char* newBuf =newchar[pLen];

charCtemp[4];

memset(Ctemp,0,4);

inti =0;

intj = 0;

while(i < pLen){

if(pText > 0){

newBuf[j++] = pText[i++];

}else{

WCHARWtemp;

UTF_8ToUnicode(&Wtemp,pText + i);

UnicodeToGB2312(Ctemp,Wtemp);

newBuf[j] = Ctemp[0];

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

i += 3;

j += 2;

}

}

newBuf[j] = ’’;

pOut = newBuf;

delete[]newBuf;

return;

}