RE: [Dev-C++] Dll export

[James G. <Jam...@Cl...>]

Use something like the following.

#ifdef TST1_EXPORTS
#define TST1_API __declspec(dllexport)
#else
#define TST1_API __declspec(dllimport)
#endif

// This class is exported from the tst1.dll
class TST1_API CTst1 {...};

extern TST1_API int nTst1;

TST1_API int fnTst1(void);

This exports the definition of the class, function or variable so it =
can be
used by a another program.

When you compile the DLL place a #define TST1_EXPORTS before the =
#include of
the .h file, so that it exports the definitions correctly. The users of =
your
DLL will not define it and so will import the definitions in the DLL.

If you use a .def file to specify the ordinal number for the function =
etc.
then when you issue version 2 of the DLL other programs will not have =
to be
recompiled.

If you do not include a .def file then the compiler will give the =
function
an ordinal number and the next version may give it another number. As =
this
number is used to bind the client call to the DLL, if it is different =
it
will fail. By defining the ordinal number yourself you ensure that it =
will
always be the same.

Example from MSVC++

LIBRARY MFC42 ; This is the name of the DLL

EXPORTS
 DllGetClassObject @ 1 PRIVATE
 DllCanUnloadNow @ 2 PRIVATE
 DllRegisterServer @ 3 PRIVATE
 DllUnregisterServer @ 4 PRIVATE
; MFC 4.2(final release)
 ??0_AFX_CHECKLIST_STATE@@QAE@XZ @ 256 NONAME

Unfortunately you also need to find the mangled name of the function to =
put
into the definition file.

This is taken from what I can remember of MSVC++ but I'm sure that it =
is the
same for Dev-C++.

Regards,

James.


-----Original Message-----
From: Jose Manuel Padron Carrillo [mailto:jos...@ya...]
Sent: Friday, January 12, 2001 8:02 AM
To: dev...@li...
Subject: Re: [Dev-C++] Dll export



--- ShadowOz <sha...@da...> escribi=F3: > Hello everybody
>=20
> Here=B4s my question:
>=20
> I=B4m trying to create a simple dll, with function I that want to be
> used by
> other application.
> Q: How can I make those functions acessible to the others
> applications?
>=20
> thx.
>=20
> Ae galera .pt, t=E1 muito frio a=ED? :-)
>=20
>=20

I'm not sure, but you can use the function LoadLibrary() and the call
the function.

At least that is what I use when I want to use InitCommonControls(). I
always load the library before.

Chemanuel=20

http://www.geocities.com/josempadron/


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