Re: Looking for information on how to properly use dll's

Hi all,

Thanks for the posts, here's some more detailed information.

I'm wanting to write an application that runs a few queries against a
Firebird DB. Then sends out an email via SMTP based on those queries.
I want to write the application in c++ or Visual C++, as it's been
awhile since I've written in them. And I need to refresh myself.

I found several SMTP classes on www.codeguru.com:

http://www.codeguru.com/cpp/i-n/internet/email/article.php/c6251/
http://www.codeguru.com/cpp/i-n/internet/email/article.php/c3403/
http://www.codeguru.com/cpp/i-n/internet/email/article.php/c3421/

All stated that they required MFC to be used.

For connecting to the Firebird DB, I found:

http://www.ibpp.org/

I spoke with the developers of IBPP (Super nice folks, BTW). And this
was their response:

"You can use IBPP source code in quite any kind of project, using MFC
or not, using Microsoft compilers or others, and the like. IBPP has
no dependencies to any of these. It only depends on the C++ language
itself and the C++ Standard Library (which shouldn't be unexpected for
a C++ program).

Now, if you're trying to build what they call a "managed C++" project,
using MFC, I'm not sure this is going to work. I have no real
experience doing so."

Now when I go into the project properties, under MFC. I have the
option of Use Standard Windows Libraries, Use MFC in a shared library
and MFC in a static library.

If I compile the IBPP in anything other then Standard Windows
Libraries I get compile errors:

Error 1 error LNK2028: unresolved token (0A000B26) "extern "C" long
__stdcall RegCloseKey(struct HKEY__ *)" (?RegCloseKey@@$
$J14YGJPAUHKEY__@@@Z) referenced in function "public: struct
ibpp_internals::GDS * __thiscall ibpp_internals::GDS::Call(void)" (?
Call@GDS@ibpp_internals@@$$FQAEPAU12@XZ) all_in_one.obj
Error 2 error LNK2028: unresolved token (0A000B77) "extern "C" long
__stdcall RegOpenKeyExA(struct HKEY__ *,char const *,unsigned
long,unsigned long,struct HKEY__ * *)" (?RegOpenKeyExA@@$
$J220YGJPAUHKEY__@@PBDKKPAPAU1@@Z) referenced in function "public:
struct ibpp_internals::GDS * __thiscall
ibpp_internals::GDS::Call(void)" (?Call@GDS@ibpp_internals@@$
$FQAEPAU12@XZ) all_in_one.obj
Error 3 error LNK2028: unresolved token (0A000BA2) "extern "C" long
__stdcall RegQueryValueExA(struct HKEY__ *,char const *,unsigned long
*,unsigned long *,unsigned char *,unsigned long *)" (?
RegQueryValueExA@@$$J224YGJPAUHKEY__@@PBDPAK2PAE2@Z) referenced in
function "public: struct ibpp_internals::GDS * __thiscall
ibpp_internals::GDS::Call(void)" (?Call@GDS@ibpp_internals@@$
$FQAEPAU12@XZ) all_in_one.obj
Error 4 error LNK2019: unresolved external symbol "extern "C" long
__stdcall RegCloseKey(struct HKEY__ *)" (?RegCloseKey@@$
$J14YGJPAUHKEY__@@@Z) referenced in function "public: struct
ibpp_internals::GDS * __thiscall ibpp_internals::GDS::Call(void)" (?
Call@GDS@ibpp_internals@@$$FQAEPAU12@XZ) all_in_one.obj
Error 5 error LNK2019: unresolved external symbol "extern "C" long
__stdcall RegQueryValueExA(struct HKEY__ *,char const *,unsigned long
*,unsigned long *,unsigned char *,unsigned long *)" (?
RegQueryValueExA@@$$J224YGJPAUHKEY__@@PBDPAK2PAE2@Z) referenced in
function "public: struct ibpp_internals::GDS * __thiscall
ibpp_internals::GDS::Call(void)" (?Call@GDS@ibpp_internals@@$
$FQAEPAU12@XZ) all_in_one.obj
Error 6 error LNK2019: unresolved external symbol "extern "C" long
__stdcall RegOpenKeyExA(struct HKEY__ *,char const *,unsigned
long,unsigned long,struct HKEY__ * *)" (?RegOpenKeyExA@@$
$J220YGJPAUHKEY__@@PBDKKPAPAU1@@Z) referenced in function "public:
struct ibpp_internals::GDS * __thiscall
ibpp_internals::GDS::Call(void)" (?Call@GDS@ibpp_internals@@$
$FQAEPAU12@XZ) all_in_one.obj
Error 7 fatal error LNK1120: 6 unresolved externals C:\Documents and
Settings\dwessell\My Documents\Visual Studio 2005\Projects\Tycho
v2.0\Debug\Tycho v2.0.exe

And none of the SMTP classes compile without MFC selected (Sorry don't
have compile errors, but will get them).

And therein lies my quandry.. :)