wstring转换char*

#include <xstring>
#include <iostream>
#include <comdef.h>

using namespace std;

char* ws2s(const wstring& ws)
{
 _bstr_t t = ws.c_str(); 
 char* pchar = (char*)t; 
 string result = pchar;
 char* charTmp = new char;
 strcpy(charTmp,result.c_str());
 pchar = NULL;
 delete pchar;
 return charTmp;
}

void main()
{
 wstring w = L"hello world\n";
 char* s = ws2s(w);
 cout<<s;
 system("pause");
}