CodeStepper
Recently I decided to write gui for allegro, I had choice between c and c++, so i chose c, perhaps for obvious reasons...
And this is my big problem...
I'm working on Visual Studio 2008 and when I compiling code, I get this message:
main.obj : error LNK2019: unresolved external symbol "struct GUI_INPUT * __cdecl al_gui_input_create(unsigned short,unsigned short,unsigned short,unsigned short)" (?al_gui_input_create@@YAPAUGUI_INPUT@@GGGG@Z) referenced in function _main
Files:
main.c:
1#include <allegro5/allegro.h>
2#include <allegro5/allegro_primitives.h>
3#include <allegro5/allegro_font.h>
4#include <allegro5/allegro_ttf.h>
5
6
7#include "input.h"
8
9int main( void )
10{
11 al_init( );
12 al_init_font_addon( );
13 al_init_ttf_addon( );
14 al_install_keyboard( );
15
16 ALLEGRO_DISPLAY *display = al_create_display( 800, 600 );
17 ALLEGRO_EVENT_QUEUE *queue = al_create_event_queue( );
18 ALLEGRO_TIMER *timer = al_create_timer( 1.0 / 60 );
19 ALLEGRO_FONT *font = al_load_font( "DejaVuSans.ttf", 16, 0 );
20
21 struct GUI_INPUT *input = al_gui_input_create( 20, 20, 100, 20 );
22
23 /////////////////
24 ALLEGRO_USTR *string = al_ustr_new( "" );
25 /////////////////
26
27 bool run = true;
28 bool redraw = true;
29
30 al_register_event_source( queue, al_get_keyboard_event_source( ) );
31 al_register_event_source( queue, al_get_timer_event_source( timer ) );
32
33 al_start_timer( timer );
34 while( run )
35 {
36 ALLEGRO_EVENT event;
37 al_wait_for_event( queue, &event );
38
39 if( event.type == ALLEGRO_EVENT_TIMER )
40 {
41 redraw = true;
42 }
43 else if( event.type == ALLEGRO_EVENT_KEY_UP )
44 {
45 if( event.keyboard.keycode == ALLEGRO_KEY_ESCAPE )
46 run = false;
47 }
48 ////////////////////
49 else if( event.type == ALLEGRO_EVENT_KEY_CHAR )
50 {
51 if( event.keyboard.unichar != 0 )
52 al_ustr_append_chr( string, event.keyboard.unichar );
53 }
54 ///////////////////
55
56
57 if( redraw && al_is_event_queue_empty( queue ) )
58 {
59 al_draw_ustr( font, al_map_rgb( 255, 255, 255 ), 50, 50, 0, string );
60 al_flip_display( );
61 al_clear_to_color( al_map_rgb( 0, 0, 0 ) );
62 }
63 }
64}
input.h
1#ifndef _al_gui_input
2#define _al_gui_input
3
4#include <allegro5/allegro.h>
5
6struct GUI_INPUT
7{
8 unsigned short startx;
9 unsigned short starty;
10 unsigned short stopx;
11 unsigned short stopy;
12};
13
14struct GUI_INPUT* al_gui_input_create( unsigned short x, unsigned short y, unsigned short width, unsigned short height );
15
16#endif
input.c
1#include "input.h"
2
3struct GUI_INPUT* al_gui_input_create( unsigned short x, unsigned short y, unsigned short width, unsigned short height )
4{
5 struct GUI_INPUT *input = (struct GUI_INPUT*)malloc( sizeof( struct GUI_INPUT ) );
6
7 input->startx = x;
8 input->starty = y;
9 input->stopx = width + x;
10 input->stopy = height + y;
11
12 return input;
13}
Plese, help...
if not, i wrote GUI in C++ 
( joke 
)
=======================
PS:
I'm stupid...
Problem solved 
Matthew Leverton
You really shouldn't use al_ as a prefix for your own projects.
Neil Walker
I take it the problem was you were compiling as c++ and not c?
CodeStepper
Yes... than i compile as c and compiler flush me heap of errors...
Probably i give up from c, not for me these blocks
I wrote this before in C++ and i thought, that maybe i can write this in c... but i doubt, that i can...