| Author |
Message |
< Yaws mailing list ~ Invoking fun() callback from within a yaws module |
| Guest |
 Posted: Wed Apr 18, 2007 8:59 pm |
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Guest
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Hi all,
This is a newbie question but I'm trying to invoke a fun() from within
a yaws module (see simplified example below).
When executing line 8, I get the following error:
yaws code at ./foo.yaws:1 crashed or ret bad val:#Fun
Req: {http_request,'GET',{abs_path,"/foo.yaws"},{1,1}}
I've had a look at the generated erl file and was able to simulate the
callback function by compiling the module and just invoking out/1 in a
shell.
At first I thought it was because of the visibility of bar/0, so I
explicitly exported that, so now bar/0 is in the foo module namespace,
but this doesn't seem to help the execution.
Is there something basic that I'm missing here?
Thanks for any help,
Ben
-------------------------------
1<erl module=foo>
2
3 -export([bar/0]).
4
5 out(A) ->
6 io:format("Executing foo module ~n"),
7 foo:bar(),
8 Cback = cb(foo,bar),
9 Cback().
10
11 bar() ->
12 io:format("Executed bar~n",[]).
13
14 cb(M,F) ->
15 fun() -> M:F() end.
16
17
18 </erl>
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| tobbe |
| Posted: Wed Apr 18, 2007 9:29 pm |
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User
Joined: 19 Jan 2005
Posts: 274
Location: Stockholm, Sweden
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Ben Hood skrev:
> Hi all,
>
> This is a newbie question but I'm trying to invoke a fun() from within
> a yaws module (see simplified example below).
>
> When executing line 8, I get the following error:
>
> yaws code at ./foo.yaws:1 crashed or ret bad val:#Fun
> Req: {http_request,'GET',{abs_path,"/foo.yaws"},{1,1}}
Isn't the problem that io:format72 returns ok, while Yaws
expects something else?
What about replacing line 9 with: {html, io_lib:format("~p", [catch Cback()])}.
Cheers, Tobbe
>
> I've had a look at the generated erl file and was able to simulate the
> callback function by compiling the module and just invoking out/1 in a
> shell.
>
> At first I thought it was because of the visibility of bar/0, so I
> explicitly exported that, so now bar/0 is in the foo module namespace,
> but this doesn't seem to help the execution.
>
> Is there something basic that I'm missing here?
>
> Thanks for any help,
>
> Ben
>
> -------------------------------
>
> 1<erl module=foo>
> 2
> 3 -export([bar/0]).
> 4
> 5 out(A) ->
> 6 io:format("Executing foo module ~n"),
> 7 foo:bar(),
> 8 Cback = cb(foo,bar),
> 9 Cback().
> 10
> 11 bar() ->
> 12 io:format("Executed bar~n",[]).
> 13
> 14 cb(M,F) ->
> 15 fun() -> M:F() end.
> 16
> 17
> 18 </erl>
>
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| anders_n |
| Posted: Wed Apr 18, 2007 10:57 pm |
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User
Joined: 28 Feb 2005
Posts: 155
Location: Saltillo, Mexico
|
On 4/18/07, Torbjorn Tornkvist <tobbe@tornkvist.org> wrote:
> Ben Hood skrev:
> > Hi all,
> >
> > This is a newbie question but I'm trying to invoke a fun() from within
> > a yaws module (see simplified example below).
> >
> > When executing line 8, I get the following error:
> >
> > yaws code at ./foo.yaws:1 crashed or ret bad val:#Fun
> > Req: {http_request,'GET',{abs_path,"/foo.yaws"},{1,1}}
>
> Isn't the problem that io:format72 returns ok, while Yaws
> expects something else?
>
> What about replacing line 9 with: {html, io_lib:format("~p", [catch Cback()])}.
>
I only sent my first reply to Ben, but to recap, I first thought that it was
something like that as well, but when I tried his code on yaws 1.68 on
openSuSE 10.2 it worked, that is, I did not get the error Ben mentioned
in his first email. But it just gave an empty page, but no errors.
/Anders
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| Guest |
| Posted: Mon Apr 23, 2007 8:25 am |
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Guest
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Anders Nygren wrote:
>
> I only sent my first reply to Ben, but to recap, I first thought that it was
> something like that as well, but when I tried his code on yaws 1.68 on
> openSuSE 10.2 it worked, that is, I did not get the error Ben mentioned
> in his first email. But it just gave an empty page, but no errors.
>
The man page yaws_api(3) thoroughly lists all return values from
out/1.
io:format/2 returns ok. The ret val 'ok' from out/1 means "Do nothing"
/klacke
--
Claes Wikstrom -- Caps lock is nowhere and
http://www.tail-f.com -- everything is under control
cellphone: +46 70 2097763
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