 | | | Linker error in VC7 with mysql++ and std::string | Linker error in VC7 with mysql++ and std::string 2007-08-03 - By Martin Dommermuth
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Hi there,
I am loosing it!
I want to write a quite simple app reading data from a special source and
dumping it
into a MySQL DB.
I got mysql++-2.3.2 and mysql-5 (See http://sql-5.ora-code.com).0.45 on Windows XP installed on F:\ (this
seems to make
problems in some cases)
First I get 2 warnings:
exceptions.h(44) : warning C4275: non dll-interface class 'exception' used
as base
for dll-interface class 'mysqlpp::Exception'
const_string.h(89) : warning C4267: 'initializing' : conversion from
'size_t' to
'mysqlpp::const_string::size_type', possible loss
of data
query.h(129) : warning C4275: non dll-interface class 'std::ios_base' used
as base
for dll-interface class 'std::basic_ios<_Elem,_Traits>'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
xiosbase(181) : see declaration of 'std::ios_base'
Is this a problem? Some sources on the net say, that VC is a bit
hypersensitive
here.
My real problem is that as soon as I link against mysql++ and use a
std::string
I get this linker error:
DB.obj : error LNK2019: unresolved external symbol "__declspec(dllimport)
public: __thiscall
std::basic_string<char,struct std::char_traits<char>,
class std::allocator<char> >::~basic_string<char,struct
std::char_traits<char>,
class std::allocator<char> >
(void)"
(__imp_??1?$basic_string@(protected)?$char_traits@(protected)@(protected)@@(protected)?$allocator@(protected)@(protected)@@(protected)@@(protected)@(protected)
Z)
referenced in function "public: void __thiscall
DB::addReadout(double,double,int,int,int)"
(?addReadout@(protected)@@(protected)@(protected))
[...]
Debug/ubisenseprovider.exe : fatal error LNK1120: 2 unresolved externals
Do I have to tell VC to link against a special lib for std::string? Why does
this work when
I don't use mysql++?
And could anyone enlighten me on the "__declspec(dllimport)" stuff?
Thanks for any tips, I am really becoming desperate here.
Martin
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