秋梦无痕

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：

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
==========

<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>