Don't forget code tags!

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Please add code tags to make it easier to read the code, and from now on whenever you post code try to use this mechanism (both here and on any other programming sites). You are more likely to get help that way.

Code tags refer to XHTML tags as follows:

<code>
int main(int argc, char * argv[])
{
return 0;
}
</code>

You cannot see it, but line 3 is 4 space characters (" ") followed by "return 0;".

That displays it as:

int main(int argc, char * argv[])
{
    return 0;
}

The syntax highlighting and monospaced font make it much easier to read the code. It will also preserve white-space so indentation is not lost. On some other sites they will use "BBCode" tags instead which use square-brackets "[]" instead of angle-brackets "<>" like so: [code]your code here[/code]. A few others use something like "markdown" (and allegro.cc supports some markdown syntax as well, but it's less reliable due to limitations with the syntax). You will eventually become familiar with all of these.

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The code that you posted has an error in it, and if you enable warnings in your compiler (and your compiler is decent) it should show it to you. Here's what GCC says with -Wall (to enable "all" warnings):

main.cpp: In function ‘int main(int, char**)’:
main.cpp:87:10: warning: the address of ‘bool al_init_image_addon()’ will always evaluate as ‘true’ [-Waddress]
     if (!al_init_image_addon) {

The error message explains what's wrong, but since English isn't your first language and you're new to programming it might not be obvious. You're missing the parenthesis "()" to invoke the al_init_image_addon function. Instead, you're testing the memory address of the function which is guaranteed to be non-zero (i.e., true) on any system you would ever run this code on. Note that since you aren't actually calling the function the image addon is not actually initialized which explains why loading the sprite later on fails.

To fix it, add the parenthesis:

     if (!al_init_image_addon()) {

Once I fix that issue the program runs without error, but it terminates immediately so the window flashes and then disappears.

That's likely because of another similar error in the code:

        if (ALLEGRO_EVENT_DISPLAY_CLOSE){

This time instead of comparing this constant/enum value with the event variable you are just testing if the constant/enum itself is non-zero (and in this case it is so key2 is immediately set to true and the second iteration of the loop exits immediately).

Fix it by comparing the event type variable instead:

        if (ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE){