Hello,

I've created a short
example<https://github.com/ik5/libnotify-fpc/blob/master/tests/test_notify.lpr>to display how to use libnotify in Pascal.
The problem is that I'm getting the following exception:

(process:7633): GLib-CRITICAL **: g_variant_new_string: assertion `g_utf8_validate (string, -1, NULL)' failed
(process:7633): GLib-CRITICAL **: g_variant_new_string: assertion `g_utf8_validate (string, -1, NULL)' failed
(process:7633): GLib-CRITICAL **: g_variant_new_string: assertion `g_utf8_validate (string, -1, NULL)' failed

The text as you can see, is pure "ASCII", so what am I missing or doing wrong here ?

Ido
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Hello,

I've created a short
<https://github.com/ik5/libnotify-fpc/blob/master/tests/test_notify.lpr> example to display how to use libnotify in Pascal. The problem is that I'm getting the following exception:

(process:7633): GLib-CRITICAL **: g_variant_new_string: assertion `g_utf8_validate (string, -1, NULL)' failed
(process:7633): GLib-CRITICAL **: g_variant_new_string: assertion `g_utf8_validate (string, -1, NULL)' failed
(process:7633): GLib-CRITICAL **: g_variant_new_string: assertion `g_utf8_validate (string, -1, NULL)' failed

The text as you can see, is pure "ASCII", so what am I missing or doing wrong here ?

Ido

Forgot to call gtk_init?

Ludo
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2011/12/14 Ludo Brands

That's create now gibrish as text :(

The original code that I tested was in C:
#include <libnotify/notify.h>
void main () {
  notify_init ("Hello world!");
  NotifyNotification * Hello = notify_notification_new ("Hello world",
"This is an example notification.", "dialog-information");
  notify_notification_show (Hello, NULL);
  notify_uninit ();
}

And after compiling it as follows:
gcc -o notify `pkg-config --cflags --libs libnotify` notify.c

It properly display the text, however the Pascal code does not, even with gtk_init(@argc, @argv) :(

Ludo

Ido

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2011/12/14 Ludo Brands

Indeed that was the problem. So what does constref is used for ?!

Thanks Ludo

Ludo

Ido

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AFAIK, the use of constref for cdecl parameters is wrong in libnotify.pas.

Indeed that was the problem. So what does constref is used for ?!

Thanks Ludo

Constref is passing a value by its reference (as in var paramter) with the promise that the callee won't change it. In this case you want to pass the pchar and not a pointer to the pchar (ppchar).

Ludo

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2011/12/14 ik :

Indeed that was the problem. So what does constref is used for ?!

Surely not to convert c headers, I've never seen it be used for that.

On Wed, Dec 14, 2011 at 18:25, Felipe Monteiro de Carvalho <

The reason I used it was this wiki entry:
http://wiki.freepascal.org/FPC_New_Features_2.6.0#Constref_parameter_modifier I guess i did not understand it correctly...

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A small suggestion for the example: test the libnotify version. The header conversion is based on 0.7.0 which is fairly recent. Ubuntu 10.04, the latest LTS, still only has version 0.4.5. The example crashes miserably with this version since notify_notification_new had an additional parameter.

Note also that the example could be reduced to a one-liner without header conversion:

Sysutils.ExecuteProcess('/usr/bin/notify-send','-i dialog-information
"Example for libnotify" "This is a simple example how to use libnotify."');

Notify-send comes with the libnotify package. I guess you need the header translation for doing things that aren't possible with notify-send but for the average user it is an easier alternative.

Ludo

Wow 0.4.5 is from 2008 and unmaintained anymore. In Arch we have newer version :)
I'll create also binding for the 0.4 version.

Actually I started translating notify-send into Pascal as a bigger example (and mostly test).
Theidea is to use the library problematically and not executing external programs (unlike "normal" users :))

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