c++ - c++将_bstr_t转换为int并将int转换为_bstr_t

我遇到一个问题，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.

有人可以帮我吗？

最佳答案

为什么不简单地使用s-> d？

    _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，这项工作？

    _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)