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Using allegro on QT, it crushes
Member #16,696
June 2017

Hello everyone

I have used allegro a couple of months ago on VisualStudio. So I'm somewhat new but I know a little about allegro.

I'm doing an application on QT and I want to include Allegro to build an specific window.

1. I downloaded the files From Here. I downloaded the MSVC 11 one.

2. I copied the content on the respective folder (lib, include, bin). On my qt folder (C:\Qt\5.9\msvc2015\lib)

3. I added this lines to my .pro file changing depending on what librarys I use:


LIBS += C:/Qt/5.9/msvc2015/lib/allegro-5.0.10-md.lib \
C:/Qt/5.9/msvc2015/lib/allegro-5.0.10-monolith-md.lib \
C:/Qt/5.9/msvc2015/lib/allegro_primitives-5.0.10-md.lib \

4. I ran some examples I found and all of them crush unless I make some changes. This example runs:

1#include <iostream> 2#include <allegro5/allegro.h> 3#include <allegro5/allegro_primitives.h> 4 5int main(){ 6 7 if(!al_init()){ 8 cout << "failed to dislpay" "Failed to initialize Allegro.\n"<< endl; 9 return -1; 10 } 11 al_init_primitives_addon(); 12 ALLEGRO_DISPLAY *display = al_create_display(640,480); 13 14 if (!display){ 15 cout << "failed to dislpay" << endl; 16 return -1; 17 } 18 al_clear_to_color(al_map_rgb(50,10,70)); 19 //al_draw_triangle(10,10,20,10,15,50, al_map_rgb(255,0,0), 1.0); 20 al_flip_display(); 21 22 al_rest(10.0); 23 24 al_destroy_display(display); 25 26 return 0; 27}

If I uncomment the line:


al_draw_triangle(10,10,20,10,15,50, al_map_rgb(255,0,0), 1);

The program stops working. The same happens with other lines like the ones related to font or drawing

Edgar Reynaldo
Member #8,592
May 2007

5.0.10 is old, and I'm pretty sure those binaries are not compatible with MSVC 2015.

Go to and download the Nuget package, or the binaries for MSVC 2015. 5.2 is much more recent, and probably fixes whatever bug you're hitting...

Member #16,696
June 2017

Thank you, it worked. It was a problem with the version as you said.

I downloaded the binaries from the section "Allegro 5.2 binary packages" for MSVC. But it didn't have all the necesary files, only some.

I made a proyect on Visual studio and downloaded the Nuget package for that proyect and copied the missing files from this proyect from the "packages" folder, it had a filder called Allegro.

I changed the references from my .pro so it points to the files I copied from the proyect on visual studio:


LIBS += C:/Qt/5.9/msvc2015/lib/allegro.lib \
C:/Qt/5.9/msvc2015/lib/allegro_monolith-static.lib \
C:/Qt/5.9/msvc2015/lib/allegro_primitives.lib \

I leave what I did in case someone else has the same problem.

By the way I didn't made the proyect on Visual Studio because I needed to add an interface for my QT proyect

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