用C++写入UTF-8格式的文件

class CChineseCode
{
public:
	static void UTF_8ToUnicode(wchar_t* pOut,char *pText);  // 把UTF-8转换成Unicode
	static void UnicodeToUTF_8(char* pOut,wchar_t* pText);  //Unicode 转换成UTF-8
	static void UnicodeToGB2312(char* pOut,wchar_t uData);  // 把Unicode 转换成 GB2312 
	static void Gb2312ToUnicode(wchar_t* pOut,char *gbBuffer);// GB2312 转换成　Unicode
	static void GB2312ToUTF_8(string& pOut,char *pText, int pLen);//GB2312 转为 UTF-8
	static void UTF_8ToGB2312(string &pOut, char *pText, int pLen);//UTF-8 转为 GB2312
};



void CChineseCode::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;
}

void CChineseCode::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;
}

void CChineseCode::UnicodeToGB2312(char* pOut,wchar_t uData)
{
	WideCharToMultiByte(CP_ACP,NULL,&uData,1,pOut,sizeof(wchar_t),NULL,NULL);
	return;
}     

void CChineseCode::Gb2312ToUnicode(wchar_t* pOut,char *gbBuffer)
{
	::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);
	return ;
}

void CChineseCode::GB2312ToUTF_8(string& pOut,char *pText, int pLen)
{
	char buf[4];
	int nLength = pLen* 3;
	char* rst = new char[nLength+1];

	memset(buf,0,4);
	memset(rst,0,nLength);



	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)
		{
			rst[j++] = pText[i++];
		}
		else
		{
			wchar_t pbuffer;
			Gb2312ToUnicode(&pbuffer,pText+i);

			UnicodeToUTF_8(buf,&pbuffer);

			unsigned short int tmp = 0;
			tmp = rst[j] = buf[0];
			tmp = rst[j+1] = buf[1];
			tmp = rst[j+2] = buf[2];    

			j += 3;
			i += 2;
		}
	}
	rst[j] = '\0';

	//返回结果
	pOut = rst;             
	delete [] rst;   

	return;
}

void CChineseCode::UTF_8ToGB2312(string &pOut, char *pText, int pLen)
{
	char * newBuf = new char[pLen+1];
	char Ctemp[4];
	memset(Ctemp,0,4);

	int i =0;
	int j = 0;

	while(i < pLen)
	{
		if(pText[i] > 0)
		{
			newBuf[j++] = pText[i++];                       
		}
		else                 
		{
			WCHAR Wtemp;
			UTF_8ToUnicode(&Wtemp,pText + i);

			UnicodeToGB2312(Ctemp,Wtemp);

			newBuf[j] = Ctemp[0];
			newBuf[j + 1] = Ctemp[1];

			i += 3;    
			j += 2;   
		}
	}
	newBuf[j] = '\0';

	pOut = newBuf;
	delete [] newBuf;

	return; 
}

void main(void)
{
	ofstream ofOut("11.txt") ;
	std::string strTemp("我叫石海龙\n") ;
	CChineseCode::GB2312ToUTF_8(strTemp, (char*)strTemp.c_str(), strTemp.size()) ;
	ofOut << strTemp.c_str() ;
	ofOut.flush() ;
	int i = 0 ;
}