Help Newbie _bstr_t - String conversion problem

[red]

How do I:

_bstr_t bID;
std::cout << "Please Enter bID:";
std::cin >> bID;

Obviously getting:

error C2679: binary '>>' : no operator found which takes a right-hand
operand of type '_bstr_t' (or there is no acceptable conversion)


red

 

[red]

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_pluslang__bstr_t.asp

 

[Rolf Magnus]

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_pluslang__bstr_t.asp

Accodring to this page, that class has an operator= that takes a const
char*, so the easiest way would probably be:

_bstr_t bID;
std::string tmp;
std::cout << "Please Enter bID:";
std::cin >> tmp;
bID = tmp.c_str();

 

[Larry I Smith]

How do I:

_bstr_t bID;
std::cout << "Please Enter bID:";
std::cin >> bID;

Obviously getting:

error C2679: binary '>>' : no operator found which takes a right-hand
operand of type '_bstr_t' (or there is no acceptable conversion)


red

Why not just use the Standard C++ 'string' instead
of the '_bstr_t'? Does it have to be a '_bstr_t'?

Larry

 

[Panjandrum]

Why not just use the Standard C++ 'string' instead
of the '_bstr_t'? Does it have to be a '_bstr_t'?

Yes, if you program in COM and not in C++.

 

[Swampmonster]

Yes, if you program in COM and not in C++.

No, if you're cool and use a std::wstring and
SysAllocString()/SysFreeString() instead.
And _please_ don't use char based strings/streams
when doing COM stuff unless you only use codes 0 to 127.