Function Pointers

SurreaL · Post by **SurreaL** » Tue Dec 23, 2003 3:26 am

I've noticed you can get the address of a function..I'm just wondering if you can use that address later to call the function?

I'm brand new to PB (used to BB!) and so I'm trying to get a handle on all this extra functionality

(no pun intended!)

Cheers,
-SurreaL

NoahPhense · Post by **NoahPhense** » Tue Dec 23, 2003 4:08 am

(near the bottom)

http://www.reelmediaproductions.com/pb/ ... nters.html

- john

SurreaL · Post by **SurreaL** » Tue Dec 23, 2003 4:45 am

Thanks for your reply!

However I have already understood the basics of how to set up pointers and use them..

I'm just wondering if there's any way to call a function from a pointed initialized with the address of said function..

IE something like this (doesn't compile..)

Code: Select all

Declare Test()
MyFunc.l = @Test()
Call (*MyFunc ())
MessageRequester("Information","Yup.",#PB_MessageRequester_Ok)

Procedure Test()
  a.l
  a = a + 1
EndProcedure

Karbon · Post by **Karbon** » Tue Dec 23, 2003 5:52 am

I don't *think* there is a way to do that.... Yet.

[edit]
errr I mean, of course there is! See below!

p2hicy · Post by **p2hicy** » Tue Dec 23, 2003 6:01 am

Code: Select all

Procedure thefunc(title.s, msg.s)
  MessageRequester(title, msg, #NULL)
EndProcedure

thefuncpointer = @thefunc()

CallFunctionFast(thefuncpointer, "hello i'm a title", "hello i'm the message")

SurreaL · Post by **SurreaL** » Tue Dec 23, 2003 6:54 am

Holy Crap.

That rules

I remember looking over CallFunctionFast and wondering if that would be possible.. I was concerned that it only worked with DLL's functions though.. This is wicked

Looks like I can fake some OO w/ PB fairly easily now..

thanks a bunch!

Karbon · Post by **Karbon** » Tue Dec 23, 2003 7:04 am

If you can, post some examples when you're finished.. There are lots of people that seem to want to use OOP in PB!

LarsG · Post by **LarsG** » Tue Dec 23, 2003 7:29 am

Hi Surreal.. welcome!

Are we going to see PurePlay soon then eh?!? 8O

-Lars

El_Choni · Post by **El_Choni** » Tue Dec 23, 2003 1:39 pm

Surreal, have a look at Interfaces in the manual, you can "fake" OOP the same way other languages do.

SurreaL · Post by **SurreaL** » Tue Dec 23, 2003 7:25 pm

El_Choni,

I've taken a look at the interfaces section.. It looks like it would be mostly useful for interfacing w/ objects created in another language. Could this be used to create a PB DLL and access objects within it..? I was referencing to simulating OO by having function pointers within a structure, sort of making that a "class" by doing so

LarsG,

Ah hah! Someone recognizes me

In fact.. Porting over my network library is something I'm looking at.. I've been trying to research the better way to do networking however, and have sort of hit a wall w/ IOCP. (I've read elsewhere on these forums that it's not possible within PB..? I wonder why..) Either way.. I do *very* much want to do it, so we'll see

Hi-Toro · Post by **Hi-Toro** » Tue Dec 23, 2003 11:01 pm

Porting over my network library is something I'm looking at..

AAAAA!!!! Traitor!!!!

... from someone else who recognises you

(I didn't know you could use CallFunctionFast in that way, though -- nice!)

ppjm99 · Post by **ppjm99** » Sat Dec 27, 2003 8:38 am

viewtopic.php?t=6913&highlight=

PureBasic Forums - English

Function Pointers

Function Pointers

not sure if this helps..

This link to a previous post might be helpful.