void Gb2312ToUtf8(const char *pcGb2312, std::string & strUtf8)
 {

//wchar_t pcUnicode[CHAR_BUFSIZE];


//gb2312 to unicode


int nUnicodeLen = MultiByteToWideChar(CP_ACP, 0, pcGb2312, -1, NULL, 0);


wchar_t * pcUnicode = new wchar_t[nUnicodeLen+1]; 
memset(pcUnicode, 0, nUnicodeLen * 2 + 2);


MultiByteToWideChar(CP_ACP, 0, pcGb2312, -1, pcUnicode, nUnicodeLen);


//unicode to utf8


int nUtf8Len = WideCharToMultiByte(CP_UTF8, 0, pcUnicode, -1, NULL, 0, NULL, NULL);


char *pcUtf8=new char[nUtf8Len + 1]; 
memset(pcUtf8, 0, nUtf8Len + 1);   


WideCharToMultiByte(CP_UTF8, 0, pcUnicode, -1, pcUtf8, nUtf8Len, NULL, NULL);


strUtf8=pcUtf8;
delete[] pcUtf8; 
delete[] pcUnicode; 
 }