c++将_bstr_t转换为int并将int转换为_bstr_t

Question

我遇到了一个问题，这是我的代码，

          _bstr_t bstrTrans=L"2";
    wsprintf(buf,L"insert into inven(ID) values(%s)",(wchar_t *)bstrTrans)//insert into database
//this can work fine, now we want to let bstrTrans add 1, likes this
            int bstrTrans2 = atoi(bstrTrans) + 1;
    wsprintf(buf,L"insert into inven(ID) values(%s)",(wchar_t *)bstrTrans2 )
// now ,it cannot work.

所以任何人都可以帮助我？

Answer 1

为什么不是简单的 s -> d 呢？

    _bstr_t bstrTrans=L"2";
    wsprintf(buf,L"insert into inven(ID) values(%s)",(wchar_t *)bstrTrans) 

//insert into database
//this can work fine, now we want to let bstrTrans add 1, likes this
    int bstrTrans2 = atoi(bstrTrans) + 1;
    wsprintf(buf,L"insert into inven(ID) values(%d)",bstrTrans2 )

编辑:嗯，这有用吗？

    _bstr_t bstrTrans=L"2";
    wsprintf(buf,L"insert into inven(ID) values(%s)",(wchar_t *)bstrTrans) 

//insert into database
//this can work fine, now we want to let bstrTrans add 1, likes this
    char t[30];
    bstrTrans = itoa ( atoi (bstrTrans) + 1 , t,10);
    wsprintf(buf,L"insert into inven(ID) values(%s)",(wchar_t *)bstrTrans)