VC中GBK与UTF8字符串的转换

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最新推荐文章于 2023-04-25 07:00:00 发布

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分类专栏： C++ 文章标签： null delete c byte function javascript

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VC中GBK与UTF8字符串的转换

技术类

想在VC中把GB2312/GBK字符串转换成UTF8/Unicode字符串，昨天折腾了三个多小时，在google上跑了好几圈，还是没能实现，结果今天早上一过来就搞定了。共享之：

引用文字

void ConvertGBKToUtf8(CString& strGBK) {
    int len=MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, NULL,0);
    unsigned short * wszUtf8 = new unsigned short[len+1];
    memset(wszUtf8, 0, len * 2 + 2);
    MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, wszUtf8, len);

    len = WideCharToMultiByte(CP_UTF8, 0, wszUtf8, -1, NULL, 0, NULL, NULL);
    char *szUtf8=new char[len + 1];
    memset(szUtf8, 0, len + 1);
    WideCharToMultiByte (CP_UTF8, 0, wszUtf8, -1, szUtf8, len, NULL,NULL);

    strGBK = szUtf8;
    delete[] szUtf8;
    delete[] wszUtf8;
}

void ConvertUtf8ToGBK(CString& strUtf8) {
    int len=MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, NULL,0);
    unsigned short * wszGBK = new unsigned short[len+1];
    memset(wszGBK, 0, len * 2 + 2);
    MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, wszGBK, len);

    len = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
    char *szGBK=new char[len + 1];
    memset(szGBK, 0, len + 1);
    WideCharToMultiByte (CP_ACP, 0, wszGBK, -1, szGBK, len, NULL,NULL);

    strUtf8 = szGBK;
    delete[] szGBK;
    delete[] wszGBK;
}

==========
2006-09-14
补充：UTF8的编解码函数
==========

引用文字

<script language="javascript">
function encode_utf8(rawtext) {
   rawtext = rawtext.replace(//r/n/g,"/n");
   var utftext = "";
   for(var n=0; n<rawtext.length; n++)
       {
       //
       var c=rawtext.charCodeAt(n);
       // 0-127 => 1byte
       if (c<128)
           utftext += String.fromCharCode(c);
       // 127 - 2047 => 2byte
       else if((c>127) && (c<2048)) {
           utftext += String.fromCharCode((c>>6)|192);
           utftext += String.fromCharCode((c&63)|128);}
       // 2048 - 66536 => 3byte
       else {
           utftext += String.fromCharCode((c>>12)|224);
           utftext += String.fromCharCode(((c>>6)&63)|128);
           utftext += String.fromCharCode((c&63)|128);}
       }
   return utftext;
}
function decode_utf8(utftext) {
   var plaintext = ""; var i=0; var c=c1=c2=0;
   while(i<utftext.length)
       {
       c = utftext.charCodeAt(i);
       if (c<128) {
           plaintext += String.fromCharCode(c);
           i++;}
       else if((c>191) && (c<224)) {
           c2 = utftext.charCodeAt(i+1);
           plaintext += String.fromCharCode(((c&31)<<6) | (c2&63));
           i+=2;}
       else {
           c2 = utftext.charCodeAt(i+1); c3 = utftext.charCodeAt(i+2);
           plaintext += String.fromCharCode(((c&15)<<12) | ((c2&63)<<6) | (c3&63));
           i+=3;}
       }
   return plaintext;
}
</script>