Re: [paragui-users] Member callbacks: MSG_CALLBACK_OBJ cast

[Vovan]

Well, it doesn't look all that easy...

First of all, yes I am using VisualC++, sorry, I should have made it more
clear.

Now, it turned out that there is this compiler option /vmg that I forgot to
include in the project build. And that seems to be the right thing, as it
allows to select the method that the compiler uses to represent pointers to
class members.

Now, I tried to compile the program using the option, and the compiler
didn't complain. However, the callback still doesn't work, as when I click
the button for which the callback is registered, the program simply freezes.
Similarly, when I move the slider in the tutorial examples, the program
blurts out an unhandled exception and dies. I am really not sure what else I
could change, as now the project settings are exactly identical.

I was thinking that maybe the problem was in the fact that I compiled the
libraries manually, and maybe there was some option I was missing there as
well. But after I downloaded the binaries and replaced what I had come up
with myself with them, it didn't make things any better...

Any more ideas on what may be going on?

Thanks in advance,
Vovan

----- Original Message -----
From: "Alexander Pipelka" <address@hidden>
To: <address@hidden>
Sent: Monday, April 21, 2003 11:20 AM
Subject: Re: [paragui-users] Member callbacks: MSG_CALLBACK_OBJ cast


>From your explanation i see that you're using VisualC++. Right ?
Please take a look at the provided VisualC++ workspace. There are some
compiler settings that *have* to be set.

It's something like 'pointer to every class'. Can't remember any more.

Alex

Am Montag, 21. April 2003 08:23 schrieb Vovan:
> Hello,
>
> I am using ParaGUI for a little application, and here is the problem I am
> having: I want to register a member method of an object for some of its
> widgets' callbacks. So, I do everything like the tutorial says, but the
> thing doesn't seem to be working. Basically, the program dies with the
> following warning:
> "The value of ESP was not properly saved across a function call.
> This is usually a result of calling a function declared with one
> calling convention with a function pointer declared with a different
> calling convention."
>
> Now, upon closer investigation, it turns out that the compiler notices
that
> too, and complains giving the following warning: "warning C4407: cast
> between different pointer to member representations, compiler may generate
> incorrect code"
>
> So, at first I was thinking that the problem was in that I didn't declare
> or define the PARAGUI_CALLBACK method properly. But it turned out that the
> same error crops up when I try to compile and run the tutorials. So, I am
> thinking that the problem has something to do with the project settings (I
> am using Visual Studio, btw), namely, the default calling convention. It
is
> set to __cdecl, but I think that is what it is supposed to be, isn't it?
>
> Any way, help would be greatly appreciated.
>
> Thanks in advance,
> Vovan
>
>
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> paragui-users mailing list
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