mbcs、unicode，UTF-8、UTF-16等的转换
代码摘自网络：（https://blog.csdn.net/a33445621/article/details/71127745）
/*-----------------内码转换-------------------------------------*/ //转换UCS4编码到UTF8编码 int UCS4_To_UTF8( unsigned int dwUCS4, BYTE*pbUTF8 )
{const BYTE abPrefix[] = {0, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC};const unsigned int adwCodeUp[] ={0x80, //U+00000000 ～ U+0000007F 0x800, //U+00000080 ～ U+000007FF 0x10000, //U+00000800 ～ U+0000FFFF 0x200000, //U+00010000 ～ U+001FFFFF 0x4000000, //U+00200000 ～ U+03FFFFFF 0x80000000 //U+04000000 ～ U+7FFFFFFF };inti, iLen;//根据UCS4编码范围确定对应的UTF-8编码字节数 iLen = sizeof(adwCodeUp) / sizeof(DWORD);for( i = 0; i < iLen; i++)
{if( dwUCS4 <adwCodeUp[i] )
{break;
}
}if( i == iLen )return 0; //无效的UCS4编码 iLen= i + 1; //UTF-8编码字节数 if( pbUTF8 !=NULL )
{//转换为UTF-8编码 for( ; i > 0; i--)
{
pbUTF8[i]= static_cast<BYTE>((dwUCS4 & 0x3F) | 0x80);
dwUCS4>>= 6;
}
pbUTF8[0] = static_cast<BYTE>(dwUCS4 | abPrefix[iLen - 1]);
}returniLen;
}//转换UTF8编码到UCS4编码 int UTF8_To_UCS4( const BYTE* pbUTF8, unsigned int&dwUCS4 )
{
INT i, iLen;
BYTE b;if( pbUTF8 ==NULL )
{//参数错误 return 0;
}
b= *pbUTF8++;if( b < 0x80)
{
dwUCS4=b;return 1;
}if( b < 0xC0 || b > 0xFD)
{//非法UTF8 return 0;
}if( b < 0xE0)
{
dwUCS4= b & 0x1F;
iLen= 2;
}else if( b < 0xF0)
{
dwUCS4= b & 0x0F;
iLen= 3;
}else if( b < 0xF8)
{
dwUCS4= b & 7;
iLen= 4;
}else if( b < 0xFC)
{
dwUCS4= b & 3;
iLen= 5;
}else{
dwUCS4= b & 1;
iLen= 6;
}for( i = 1; i < iLen; i++)
{
b= *pbUTF8++;if( b < 0x80 || b > 0xBF)
{//非法UTF8 break;
}
dwUCS4= (dwUCS4 << 6) + (b & 0x3F);
}if( i <iLen )
{//非法UTF8 return 0;
}returniLen;
}//转换UCS4编码到UCS2编码 int UCS4_To_UTF16( DWORD dwUCS4, WORD*pwUTF16 )
{if( dwUCS4 <= 0xFFFF)
{if( pwUTF16 !=NULL )
{*pwUTF16 = static_cast<WORD>(dwUCS4);
}return 1;
}else if( dwUCS4 <= 0xEFFFF)
{if( pwUTF16 !=NULL )
{
pwUTF16[0] = static_cast<WORD>( 0xD800 + (dwUCS4 >> 10) - 0x40 ); //高10位 pwUTF16[1] = static_cast<WORD>( 0xDC00 + (dwUCS4 & 0x03FF) ); //低10位 }return 2;
}else{return 0;
}
}//转换UCS2编码到UCS4编码 INT UTF16_To_UCS4( const WORD* pwUTF16, unsigned int&dwUCS4 )
{
WORD w1, w2;if( pwUTF16 ==NULL )
{//参数错误 return 0;
}
w1= pwUTF16[0];if( w1 >= 0xD800 && w1 <= 0xDFFF)
{//编码在替代区域（Surrogate Area） if( w1 < 0xDC00)
{
w2= pwUTF16[1];if( w2 >= 0xDC00 && w2 <= 0xDFFF)
{
dwUCS4= (w2 & 0x03FF) + (((w1 & 0x03FF) + 0x40) << 10);return 2;
}
}return 0; //非法UTF16编码 }
dwUCS4=w1;return 1;
}//转换UTF8字符串到UTF16字符串 INT UTF8Str_To_UTF16Str( const BYTE* pbszUTF8Str, WORD*pwszUTF16Str )
{
INT iNum, iLen;
unsignedintdwUCS4;if( pbszUTF8Str ==NULL )
{//参数错误 return 0;
}
iNum= 0; //统计有效字符个数 while( *pbszUTF8Str )
{//UTF8编码转换为UCS4编码 iLen =UTF8_To_UCS4( pbszUTF8Str, dwUCS4 );if( iLen == 0)
{//非法的UTF8编码 return 0;
}
pbszUTF8Str+=iLen;//UCS4编码转换为UTF16编码 iLen =UCS4_To_UTF16( dwUCS4, pwszUTF16Str );if( iLen == 0)
{return 0;
}if( pwszUTF16Str !=NULL )
{
pwszUTF16Str+=iLen;
}
iNum+=iLen;
}if( pwszUTF16Str !=NULL )
{*pwszUTF16Str = 0; //写入字符串结束标记 }returniNum;
}//转换UTF16字符串到UTF8字符串 int UTF16Str_To_UTF8Str( const WORD* pwszUTF16Str, BYTE*pbszUTF8Str )
{
INT iNum, iLen;
unsignedintdwUCS4;if( pwszUTF16Str ==NULL )
{//参数错误 return 0;
}
iNum= 0;while( *pwszUTF16Str )
{//UTF16编码转换为UCS4编码 iLen =UTF16_To_UCS4( pwszUTF16Str, dwUCS4 );if( iLen == 0)
{//非法的UTF16编码 return 0;
}
pwszUTF16Str+=iLen;//UCS4编码转换为UTF8编码 iLen =UCS4_To_UTF8( dwUCS4, pbszUTF8Str );if( iLen == 0)
{return 0;
}if( pbszUTF8Str !=NULL )
{
pbszUTF8Str+=iLen;
}
iNum+=iLen;
}if( pbszUTF8Str !=NULL )
{*pbszUTF8Str = 0; //写入字符串结束标记 }returniNum;
}