18 replies to this topic

[King of the Boneheads]

http://codepad.org/aG4zacD3

My issue is that every time I compile & run it, It waits a couple seconds then crashes. Like, stops responding.

Does anyone have a clue what I'm doing wrong?

[Black-Rook]

Your error code states "Line 29: error: allegro5/allegro.h: No such file or directory", are you sure that you're using the right path for allegro.h ?

I noticed errors in your code:

if(!al_init()) {
	  fprintf(stderr, "failed to initialize allegro!\n");
	  return -1;
   }

All you're doing is checking if al_init() returns false... Yet you never called al_init().

You need to call the following right before the check to see if they return false.

al_init();
al_install_keyboard();

ect....

[stitchs]

I have to disagree with the error you pointed out. I use conditional checks like that in my code and I have never had an issue. With his code it becomes somewhat condensed by calling the method and checking it's false. If it is false it exits the program, if it's true it continues on.

al_init() is called in this usage, it just saves an additional line by calling it in one if statement, than calling it, and then checking 3-7 lines later.

In response to the original question, it sounds most likely what Black-Rook suggested, that you may not have linked the libraries correctly to your project. Which IDE are you using?

Regards,

Stitchs.

[Black-Rook]

Oops, was 3am while writing! Guess I wasn't fully thinking there. Yes he is right, it goes through the function on the check while performing the inialization, then returns true or false.

Sorry about that!

[King of the Boneheads]

Which IDE are you using?

I use Code::Blocks for the IDE.

[stitchs]

Have you made a project in CodeBlocks using Allegro 5 before? I just wonder if you have your linkers have been properly set.

[Black-Rook]

Allegro wiki has all the answers for correctly setting it up.

http://wiki.allegro.cc/index.php?title=Allegro_5

[King of the Boneheads]

First things first, yes, in fact this .cpp file is IN a Code::Blocks project file, linked to all allegro things necessary. I have followed that Allegro 5 tutorial, and it's not the projects fault (I think).

So I set some breakpoints (well, I printed at various points in code)

And tracked it down to which line it crashes on, and:

http://codepad.org/kOFCWkA5

It seems to crash at line 59. "al_set_target_bitmap(al_get_backbuffer(display));"

I really need someone who's advanced to help me out, because the answer is not exactly obvious as to why it crashed.

[Shaquil]

I'm in class, so I can't exactly check, but off the top of my head:

Add these two lines:

#include <allegro5/image.h>

and somewhere before you create the bitmap

al_init_image_addon();

[King of the Boneheads]

"allegro5/image.h: No such file or directory".
:/

[Shaquil]

http://alleg.sourcef....0.7/image.html

it exists. Maybe you're not linking right. Hmm

EDIT:

I'm sorry

#include <allegro5/allegro_image.h>

all better?

Edited by Shaquil, 24 October 2012 - 03:54 PM.

[King of the Boneheads]

Nope, still crashes at line 59.

[Mike_Stoddart]

Assign the return value of al_get_backbuffer and make sure it's valid. Probably it's returning null? I don't know allegro but did you initialize it with the option of using the backbuffer?

[Mike_Stoddart]

Change line 41 to:

if(display == NULL) {

The manual says that al_create_display returns NULL, so don't assume it's Boolean value.

[King of the Boneheads]

After I changed line 41 (49 in the code w/Breakpoints&and the new #include by shaquil) to that, the program got compiled & ran just fine, but it still crashed at line 59. (73 in my code)

[Shaquil]

Change line 41 to:

if(display == NULL) {

The manual says that al_create_display returns NULL, so don't assume it's Boolean value.

That's a waste of time. if(!display) and if(display == NULL) are the same exact thing.

Also, remove my suggestion of the image addon stuff. I was wrong. I've run your code in Visual Studio 2012 Professional. It worked. I've attached a screenshot in dual-screen mode. I have no idea how to make allegro work with codeblocks, so I can't help you with figuring out what possible linkage problems might be occuring.

Attached Thumbnails

• 

[King of the Boneheads]

hmmm...

Well, here's my .cbp (Code Blocks Project file) that contains my .cpp file:

- { http://codepad.org/JCrRLUFQ } -

[Shaquil]

that code says there's something wrong on line 11. Could that be it? I hope you figure this out. I'm honestly perplexed. It seems like something going on under the API itself. Or maybe you've downloaded a version of allegro that isn't compatible with whatever compiler code::blocks uses. Try allegro.cc, the users on that forum are active and knowledgable. It seems very few people here honestly use allegro.

[willpowered]

that code says there's something wrong on line 11. Could that be it?

Highly doubtful, considering that codepad is trying to compile the cbp file as C++ code.

I also second allegro.cc for some help.