Jump to content

  • Log In with Google      Sign In   
  • Create Account

SDL: Problem with TTF fonts - program crashes


Old topic!
Guest, the last post of this topic is over 60 days old and at this point you may not reply in this topic. If you wish to continue this conversation start a new topic.

  • You cannot reply to this topic
5 replies to this topic

#1 loxagossnake   Members   -  Reputation: 156

Like
0Likes
Like

Posted 08 July 2013 - 09:48 AM

So, following the lazyfoo.net tutorials on SDL, and with the help of a friend/team member who created some neat images for me, I tried to make a simple program that shows a menu with some text, and after a key press (I didn't implement that part yet) goes into the 'main game' (in reality, just another background) and after a short delay shuts down. Here's my code - I know it's not optimal writing all of it in a single source file, but I'm trying to keep things simple before moving into multiple files:

 

#include "SDL/SDL.h"
#include "SDL/SDL_ttf.h"
#include <string>

//The attributes of the screen
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

//Surfaces to be used
SDL_Surface* screen = NULL;
SDL_Surface* backImage = NULL;
SDL_Surface* batImage = NULL;
SDL_Surface* backMenu = NULL;
SDL_Surface* messageMenu = NULL;

//Fonts to be used
TTF_Font* menuFont = NULL;

//Function definitions
bool init()
{
    //Initialize all SDL subsystems
    if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
    {
        return false;
    }

    //Set up the screen
    screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );

    //If there was an error in setting up the screen
    if( screen == NULL )
    {
        return false;
    }

    //Initialize SDL_ttf
    if( TTF_Init() == -1 )
    {
        return false;
    }

    //Set the window caption
    SDL_WM_SetCaption( "TTF Test", NULL );

    //If everything initialized fine
    return true;
}
SDL_Surface* load_image(std::string filename)
{
    //Temporary storage for the image that's loaded
    SDL_Surface* loadedImage = NULL;

    //The optimized image that will be used
    SDL_Surface* optimizedImage = NULL;

    loadedImage = SDL_LoadBMP( filename.c_str());

    if( loadedImage != NULL )
    {
        //Create an optimized image
        optimizedImage = SDL_DisplayFormat( loadedImage );

        //Free the old image
        SDL_FreeSurface( loadedImage );
    }

    //Return the optimized image
    return optimizedImage;

}

void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination )
{
    //Make a temporary rectangle to hold the offsets
    SDL_Rect offset;

    //Give the offsets to the rectangle
    offset.x = x;
    offset.y = y;

     //Blit the surface
    SDL_BlitSurface( source, NULL, destination, &offset );
}

/*
void MainMenu()
{
    SDL_Surface* bg_menu = NULL;
    SDL_Surface* msg_menu = NULL;

    TTF_Font* text_menu = NULL;

    SDL_Color textColor = { 255, 255, 255 };


    //load necessary files
    bg_menu = load_image("menu_background.bmp")


}
*/

int main( int argc, char* args[] )
{
    init();

    //  --------------- MAIN MENU START ---------------

    //Load necessary menu files
    backMenu = load_image("menu_background.bmp");
    menuFont = TTF_OpenFont( "lazy.ttf", 28 );

    SDL_Color menuTextColor = {255,255,255};
    messageMenu = TTF_RenderText_Solid( menuFont, "Press Any Key To Continue", menuTextColor );

     //If there was an error in rendering the text
    if( messageMenu == NULL )
    {
        return 1;
    }

    //Render menu
    apply_surface (0,0,backMenu,screen);
    apply_surface (100,600,messageMenu,backMenu);

    SDL_Flip(screen);

    SDL_Delay(4000);

    // --------------- MAIN MENU END ---------------

    //Free surfaces
    SDL_FreeSurface(backMenu);
    SDL_FreeSurface(messageMenu);

    TTF_CloseFont( menuFont );

    SDL_Quit();

    return 0;




}

I think it is a rather simple program but unfortunately it is giving me trouble. When I execute it, I get a brief black screen, the program shuts down and I get a status 3 error. I suspected it has something to do with the newly-installed TTF extension library, so I started commenting lines. Apparently, when I comment the

messageMenu = TTF_RenderText_Solid( menuFont, "Press Any Key To Continue", menuTextColor );

line, the program runs, I just only see the menu background, so I guess the glitch is isolated in that line of code.

I strongly believe that I installed the library correctly - else, would it be going up to that point? Of course I can't take an oath as I'm a beginner, but I don't think that's the problem.

Any ideas, folks? I'm really eager to implement some events, so I need to get over this!

 



Sponsor:

#2 SiCrane   Moderators   -  Reputation: 9599

Like
0Likes
Like

Posted 08 July 2013 - 10:11 AM

Is menuFont valid when you call TTF_RenderText_Solid? Try checking the return from TTF_OpenFont().



#3 loxagossnake   Members   -  Reputation: 156

Like
0Likes
Like

Posted 08 July 2013 - 10:38 AM

By changing the return of 
 

if( messageMenu == NULL )
    {
        return 2;
    }

to 2 (just to signify the error is coming from there), it seems this is the case. What can I do about it?



#4 SiCrane   Moderators   -  Reputation: 9599

Like
0Likes
Like

Posted 08 July 2013 - 10:40 AM

Try checking TTF_GetError() for what the error is.



#5 loxagossnake   Members   -  Reputation: 156

Like
0Likes
Like

Posted 08 July 2013 - 10:47 AM

Ah, I found it. Apparently, I had accidentally deleted the font file while moving some of them. Sorry for the hassle.

Still, I got some useful answers; now I know how to check for errors better! Thanks for all your advice!



#6 rip-off   Moderators   -  Reputation: 8228

Like
0Likes
Like

Posted 08 July 2013 - 12:06 PM

You should be checking, propagating and handling all errors all the time. It is not a debugging tool, it is an absolutely necessary part of writing robust software for more than your personal use.






Old topic!
Guest, the last post of this topic is over 60 days old and at this point you may not reply in this topic. If you wish to continue this conversation start a new topic.



PARTNERS