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//=================== UTF-8 -> GB2312 =================== 把UTF-8转换成Unicodevoid UTF_8ToUnicode(WCHAR* 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;}// 把Unicode 转换成 GB2312 void UnicodeToGB2312(char* pOut,unsigned short uData){WideCharToMultiByte(CP_ACP,NULL,(LPCWSTR)&uData,1,pOut,sizeof(WCHAR),NULL,NULL);return;} //UTF-8 转为 GB2312void UTF_8ToGB2312(CString &pOut, char *pText, int pLen){ //char * newBuf = new char[pLen];char * newBuf = new char[1+pLen / 2 * 3];//按照全是汉字的情况预留空间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; }

使用 UTF_8ToGB2312(str,str.GetBuffer(str.GetLength()+1),str.GetLength());