void *

[Michael Sgier]

Hi
how should I call that function? I don't understant the parameter. What
exactly is void * inRefcon doing?
Many thanks
Michael

 

[Michael Sgier]

thanks Paavo
so how can i dereference that? the code below does not work:
Many thanks again
Michael


if ( GetFDCallback == (int*)1 ) {
sometheing;
}

 

[Default User]

thanks Paavo
so how can i dereference that? the code below does not work:
Many thanks again
Michael


if ( GetFDCallback == (int*)1 ) {
sometheing;
}

1. Please include quotes to provide for your posts. See almost every
other message in the group.

2. What do you mean by, "doesn't work"?

3. Also, you didn't deference anything in the snippet.



Brian

 

[mikethebike]

Hi Brian

-------------------

dereferencing? might be the wrong word? Anyway GetFDCallback returns
FD. FD is defined as int. Actually I want to:
if FD == 1 do that
elseif FD == 2 do other
etc.
Could I simmply leave away: (void * inRefcon)? I don't see the point
why this has been done so.
Thanks
Michael

 

[mikethebike]

That's the error I get with the above:

 

[Ismo Salonen]

Hi Brian

----------
---------

dereferencing? might be the wrong word? Anyway GetFDCallback returns
FD. FD is defined as int. Actually I want to:
if FD == 1 do that
elseif FD == 2 do other
etc.
Could I simmply leave away: (void * inRefcon)? I don't see the point
why this has been done so.
Thanks
Michael

The error message suggests that you are not calling the function (thus
just comparing the address).

if ( GetFDCallback() == (int*)1 ) {

Add the () there.

ismo

 

[Alf P. Steinbach]

* Ismo Salonen:

The error message suggests that you are not calling the function (thus
just comparing the address).

if ( GetFDCallback() == (int*)1 ) {

Add the () there.

According to Michael's original post the function signature is

int GetFDCallback( void* )

so the above would be very invalid code.

I think any advice here about how to "call" the function would probably mislead
Michael, since it seems that his idea of "calling" it is just a wild idea.

Mostly the problem boils down to Michael assuming that readers of his post are
telepathic. Well, Michael, we're not telephathic: offhand we have no clue as to
where you stumbled over this function or what it's about or whether its name is
indicative of something or just a name you cooked up, or whatever, and no-one is
going to spend time trying to find out. As suggested else-thread, RTFM.


Cheers & hth.,

- Alf

 

[Default User]

Hi Brian

----------
---------

dereferencing? might be the wrong word? Anyway GetFDCallback returns
FD. FD is defined as int. Actually I want to:
if FD == 1 do that
elseif FD == 2 do other
etc.
Could I simmply leave away: (void * inRefcon)? I don't see the point
why this has been done so.

I can't figure out what you want. Start over and lay out the
requirements for what you are trying to do, including a small usage
example. Don't bother with the code, as that's not what you need anyway.



Brian