introduction/Approach to parsing/Game development

This is a discussion on introduction/Approach to parsing/Game development within the C++ Programming forums, part of the General Programming Boards category; Hey, Just joined the forum! hope to find much knowledge! Anyway, Im writing a c++ game using the SDL graphics ...

  1. #1
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    Question introduction/Approach to parsing/Game development

    Hey, Just joined the forum! hope to find much knowledge!

    Anyway, Im writing a c++ game using the SDL graphics library.

    Ive got gravity, a character, a map loaded (from a textfile), etc. But I need to animate the character and i think its inefficient to put all the info of the x's, y's, w's and h's of all the characters movements in the code itself. I decided to put it all in a text file and 'parse' it, and this is where im having trouble, just cant get it to read the characters properly.

    Am i taking the right approach, and if i am, how would i 'parse' the text file, ive tried many times myself.

    This is the file says that im trying to read from:

    Code:
    type:1
    {
    anim:1
    {
    subanim:1
    {
    x:63
    y:8
    w:30
    h:40
    }
    subanim:2
    {
    x:95
    y:11
    w:33
    h:37
    }
    delay:500
    }
    }
    And this is the code (a function) to read the file

    Code:
    void animateEntity(int animation, int entityNum , vector<liveEntity> entityInfo)
    {
        //Temp variable for storage
    
        int type = 0;
    
        //Different Stages
    
        int stage = 0;
    
        //used for EOF
    
        int c;
    
        //For loops and other things
    
        int i = 0;
    
        //load some vars
    
        entityInfo.at(entityNum).animState = animation;
    
        entityInfo.at(entityNum).subAnimState++;
    
        //load the file
    
        FILE *animFile;
    
        animFile = fopen("animations.txt", "r");
    
        while((c = fgetc(animFile)) != EOF)
        {
            i++;
        }
    
        fclose(animFile);
    
        //create string/char based on i
    
        char animString[i];
        i = 0; //Reset i for reuse
    
        //put the chars into the array
    
        animFile = fopen("animations.txt", "r");
    
        while((c = fgetc(animFile)) != EOF)
        {
            animString[i] = c;
        }
    
        fclose(animFile);
    
        for (i = 0; i < sizeof(animString); i++)
        {
            if (stage == 0)
            {
                if (animString[i] == 't' && animString[i + 1] == 'y' && animString[i + 2] == 'p' && animString[i + 3] == 'e' && animString[i + 4] == ':')
                {
                    if (entityInfo.at(entityNum).type == animString[i + 5] - '0')
                    {
                        type = entityInfo.at(entityNum).type;
                        stage = 1;
                    }
                }
            }
            else if (stage == 1)
            {
                if (animString[i] == '{')
                {
                    stage = 2;
                }
            }
            else if (stage == 2)
            {
                if (animString[i] == 'a' && animString[i + 1] == 'n' && animString[i + 2] == 'i' && animString[i + 3] == 'm' && animString[i + 4] == ':')
                {
                    entityInfo.at(entityNum).subAnimState = animString[i + 5] - '0';
                }
            }
        }
    }
    many thanks, Super Stinger
    Last edited by Super_Stinger; 02-23-2012 at 02:16 AM. Reason: Code stuffed up

  2. #2
    and the hat of int overfl Salem's Avatar
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    > animString[i] = c;
    Perhaps put all the chars in the same place?

    Or perhaps spread through the array
    animString[i++] = c;
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
    and the hat of int overfl Salem's Avatar
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    Edit:

    Rather than inventing your own format and parser, consider using something like http://en.wikipedia.org/wiki/XML

    You don't have to spend so much effort inventing the file format, or getting all picky parsing individual characters. There are many libraries available to do the grunt work, and give you the semantic content of the file right away.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  4. #4
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    Thanks!

    Thanks for that, ill look it up

  5. #5
    C++ Witch laserlight's Avatar
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    I note that your current file format very loosely resembles JSON. You could very well just turn it into JSON then use a JSON library like JSON Spirit.
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