dev-cpp-users

[Dev-C++] dll

[Noorez K. <coo...@ho...>]

sorry, another thing came across my mind..

In some tutorials, when they talked about exporting functions, they used 
_cdecl (or something like that). What is that for?

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[Dev-C++] dll

[Noorez K. <coo...@ho...>]

for functions in dlls,  do I need to use the  __declspec (dllexport)  for 
both the declaration and definition of the function to compile the dll 
correctly or is it ok in just one place. If it's just one place where do I 
need it?

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Re: [Dev-C++] dll

[<or...@vp...>]

Noorez Kassam wrote:
> for functions in dlls,  do I need to use the  __declspec (dllexport) =20
> for both the declaration and definition of the function to compile the=20
> dll correctly or is it ok in just one place. If it's just one place=20
> where do I need it?

It is enough in the declaration.
(Don't forget that it's need to be __declspec(dllimport) when using the D=
LL! - can be done=20
with some macro mumbo-jumbo)

As a side note, if you are sure, that you will never use any compiler apa=
rt from GCC, then=20
  this __declspec() stuff is not needed at all, as far as I know, because=
 GCC can=20
auto-import symbols. Have to read more on this myself, I just wanted you =
to know about it.

--
Greetings,
   Bal=E1zs

Re: [Dev-C++] dll

[Daniel K. O. <dan...@ya...>]

OROSZI Balázs wrote:

> As a side note, if you are sure, that you will never use any compiler 
> apart from GCC, then  this __declspec() stuff is not needed at all, as 
> far as I know, because GCC can auto-import symbols. Have to read more 
> on this myself, I just wanted you to know about it.


A bit of info about this:
http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#index-_0040code_007b_005f_005fdeclspec_0028dllexport_0029_007d-1646

"For Microsoft Windows based targets the use of the dllimport attribute 
on functions is not necessary, but provides a small performance benefit 
by eliminating a thunk in the DLL. (...)"


Daniel K. O.

Re: [Dev-C++] dll

[Per W. <pw...@ia...>]

Just a short reminder. Everyone is allowed so ask questions on the list,
as long as the questions is reasonably on-topic.

However, it is customary on most mailing lists to also give some feedback
to received answers. Some reasons for feedback:

- To let responders know if you read their answers.
- To let responders know if they understood the question correctly - or
you understood the answer.
- To let other readers know when a problem have been solved, so they don't
have to continue adding more or less redundant answers.
- To let future readers of the archive know if the question got an
acceptable answer, or if they should continue to google somewhere else.

Almost always, giving feedback taks less time than what was spent on
giving the answers to your original questions. Feel free to spend some
time on a response now and then. Id doesn't hurt you, and is good
netiquette :)

/Per W

On Sun, 29 Aug 2004, Noorez Kassam wrote:

> for functions in dlls,  do I need to use the  __declspec (dllexport)  for
> both the declaration and definition of the function to compile the dll
> correctly or is it ok in just one place. If it's just one place where do =
I
> need it?
>
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Re: [Dev-C++] dll

[Alvin T. <alv...@th...>]

Noorez Kassam wrote:
> sorry, another thing came across my mind..
> 
> In some tutorials, when they talked about exporting functions, they used 
> _cdecl (or something like that). What is that for?

it tells the compiler to expose that item for export (so it can be 
externally linked). if you see a define like 'DLLEXPORT' it usually is that.

-alvin