string_To_UTF8方法

std::string string_To_UTF8(const std::string & str);

std::string string_To_UTF8(const std::string & str) 

{ 
int nwLen = ::MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, NULL, 0); 


wchar_t * pwBuf = new wchar_t[nwLen + 1];//一定要加1，不然会出现尾巴 
ZeroMemory(pwBuf, nwLen * 2 + 2); 


::MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.length(), pwBuf, nwLen); 


int nLen = ::WideCharToMultiByte(CP_UTF8, 0, pwBuf, -1, NULL, NULL, NULL, NULL); 


char * pBuf = new char[nLen + 1]; 
ZeroMemory(pBuf, nLen + 1); 


::WideCharToMultiByte(CP_UTF8, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL); 


std::string retStr(pBuf); 


delete []pwBuf; 
delete []pBuf; 


pwBuf = NULL; 
pBuf  = NULL; 


return retStr; 
}