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| Allegro strings |
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Lance5057
Member #12,864
May 2011
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I'm having a small issue. When I send my UTF-8 string to a function it puts stuff in it no problem but as soon as the function closes and goes back the string is empty. It's being passed by pointer so nothing is being returned. |
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Edgar Reynaldo
Major Reynaldo
May 2007
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It sounds more like you are passing an regular object on the stack, but you said you're using a pointer. Show the code for the function that isn't working. My Website! | EAGLE GUI Library Demos | My Deviant Art Gallery | Spiraloid Preview | A4 FontMaker | Skyline! (Missile Defense) Eagle and Allegro 5 binaries | Older Allegro 4 and 5 binaries | Allegro 5 compile guide |
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Lance5057
Member #12,864
May 2011
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1//Calling
2ShowToolTip(Inventory[0],tip);
3
4//Function
5#include "BL.h"
6
7void ShowToolTip(Item item,ALLEGRO_USTR* tip)
8{
9 tip=al_ustr_new("");
10 if(item.type==1)
11 {
12
13 switch(item.prefix)
14 {
15 case NOPREFIX: break;
16 case ABLE: al_ustr_append_cstr(tip,"Able ");
17
18 case VINED: al_ustr_append_cstr(tip,"Vined ");
19 }
20
21 switch(item.multiplier)
22 {
23 case CARDBOARD: al_ustr_append_cstr(tip,"CardBoard ");
24 }
25
26 switch(item.ID)
27 {
28 case 1: al_ustr_append_cstr(tip,"Sword ");
29 }
30
31 if(item.suffix>NOSUFFIX)
32 {
33 al_ustr_append_cstr(tip,"of the ");
34 }
35
36 switch(item.suffix)
37 {
38 case NOSUFFIX: break;
39
40 case RAT: al_ustr_append_cstr(tip,"Rat");
41 case FOX: al_ustr_append_cstr(tip,"Fox");
42 case WOLF: al_ustr_append_cstr(tip,"Wolf");
43 case BULL: al_ustr_append_cstr(tip,"Bull");
44 case BEAR: al_ustr_append_cstr(tip,"Bear");
45
46 }
47 }
48}
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Fishcake
Member #8,704
June 2007
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I commonly do this mistake. tip=al_ustr_new(""); does not change the value of "tip" which you've passed when you called this function: ShowToolTip(Inventory[0],tip); You should change the function to something like this: 2{
4 if(item.type==1)
5 {
6
7 switch(item.prefix)
8 {
9 case NOPREFIX: break;
10 case ABLE: al_ustr_append_cstr(tip,"Able ");
11
12 case VINED: al_ustr_append_cstr(tip,"Vined ");
13 }
14
15 switch(item.multiplier)
16 {
17 case CARDBOARD: al_ustr_append_cstr(tip,"CardBoard ");
18 }
19
20 switch(item.ID)
21 {
22 case 1: al_ustr_append_cstr(tip,"Sword ");
23 }
24
25 if(item.suffix>NOSUFFIX)
26 {
27 al_ustr_append_cstr(tip,"of the ");
28 }
29
30 switch(item.suffix)
31 {
32 case NOSUFFIX: break;
33
34 case RAT: al_ustr_append_cstr(tip,"Rat");
35 case FOX: al_ustr_append_cstr(tip,"Fox");
36 case WOLF: al_ustr_append_cstr(tip,"Wolf");
37 case BULL: al_ustr_append_cstr(tip,"Bull");
38 case BEAR: al_ustr_append_cstr(tip,"Bear");
39
40 }
41 }
42
43 *result = tip; 44}
Calling the function: ShowToolTip(Inventory[0], &tip);
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Lance5057
Member #12,864
May 2011
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Ahh hey that does make sense. Thanks Fish |
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Matthew Leverton
Supreme Loser
January 1999
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This is simpler: ALLEGRO_USTR *ShowToolTip(Item item) { ALLEGRO_USTR *tip=al_ustr_new(""); // ... return tip; } ALLEGRO_USTR *tip = ShowToolTip(item); // maybe it should be called GetToolTip() Also, you are passing the item by value. You may want to pass its pointer (or by reference if using C++). |
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In this case, the variable "tip" is only local to this function. Meaning that this line: