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reading a file with highscores?

 
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Ghoti



Joined: 31 Dec 2005
Posts: 288
PostPosted: Mon May 22, 2006 7:00 pm    Post subject: reading a file with highscores? Reply with quote
Hi folks,

me again (just about ready to release the first version of my game so all the things i couldn't do or gave me errors a left must be handled now so that why the questions :S )

I have this read and save function of my highscores. the problem is however that it save the values and i pass the \n function to make a new line
how can read the value only to that point? i mean now it reads the file and shows the whole while including the strange character for a new line saved in the file but a new line is not shown.

any ideas on this?

EDIT NEW:

i have read the file and i use an for loop to loop through the entire char array to extract the pieces but how do i save the char from char[0] to char[5] into an integer? i now cast it but without much success
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My PSP games:

Boxy II: http://www.ghoti.nl/boxyii.php
Elementals: http://www.ghoti.nl/Elementals.php
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Jim



Joined: 02 Jul 2005
Posts: 487
Location: Sydney
PostPosted: Mon May 22, 2006 8:54 pm    Post subject: Reply with quote
To convert strings to integers use atoi() or, better still, strtol() or strtoul().
Use sprintf() to convert the integers back to strings.

Jim
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Ghoti



Joined: 31 Dec 2005
Posts: 288
PostPosted: Mon May 22, 2006 9:12 pm    Post subject: Reply with quote
thanks but if have another problem:

Code:
if (writepath[a] == '*'){
            if (aTmp == 1) {
               aCurrent += 1;
               sBuffer == NULL;
               for (i=aLast;i<a;i++){
                  sprintf(sBuffer, "%s%s",sBuffer,writepath[i]);
               }
               DebugOutput(sBuffer);
               iHigh[aCurrent] = atoi(sBuffer);
               //DebugOutput(sBuffer);
               //sTmp = sBuffer;
               aLast = a+1;
               aTmp += 1;
            }


the writepath is a char but my compiler says that i give an integer in and i use %s how can i add it to sbuffer ?
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My PSP games:

Boxy II: http://www.ghoti.nl/boxyii.php
Elementals: http://www.ghoti.nl/Elementals.php
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memon



Joined: 03 Oct 2005
Posts: 63
PostPosted: Mon May 22, 2006 10:06 pm    Post subject: Reply with quote
Ghoti, I wonder what piece of code should do :) I see a bit of Lua-ism there.

I think the easiest way to read/write simple records to a file is to use the fprintf/fscanf combo. Say, you want to write the name of the player and a score it could be pretty much like this:

Code:

#include <stdio.h>
#include <string.h>

struct Score
{
   char   name[64];
   int      score;
};

Score   g_scoreboard[100];
int      g_nScores = 0;

void AddScore(const char* name, int score)
{
   strncpy(g_scoreboard[g_nScores].name, name, 64);
   g_scoreboard[g_nScores].score = score;
   g_nScores++;
}

void ClearScoreboard()
{
   for(int i = 0; i < g_nScores; i++)
   {
      g_scoreboard[i].name[0] = '\0';
      g_scoreboard[i].score = 0;
   }
   g_nScores = 0;
}

void DumpScoreboard()
{
   printf("Scoreboard:\n");
   for(int i = 0; i < g_nScores; i++)
      printf(" - %s %d\n", g_scoreboard[i].name, g_scoreboard[i].score);
}

void WriteScoreboard()
{
   FILE*   fp = fopen("score.txt", "w");
   if(!fp)
      return;
   fprintf(fp, "%d\n", g_nScores);
   for(int i = 0; i < g_nScores; i++)
      fprintf(fp, "%s %d\n", g_scoreboard[i].name, g_scoreboard[i].score);
   fclose(fp);
}

void ReadScoreboard()
{
   FILE*   fp = fopen("score.txt", "r");
   if(!fp)
      return;
   fscanf(fp, "%d\n", &g_nScores);
   for(int i = 0; i < g_nScores; i++)
      fscanf(fp, "%s %d\n", g_scoreboard[i].name, &g_scoreboard[i].score);
   fclose(fp);
}

int main(int argc, char* argv[])
{
   AddScore("Mikko", 100);
   AddScore("Esko", 1230);
   AddScore("Petteri", 10);

   WriteScoreboard();
   DumpScoreboard();

   ClearScoreboard();
   DumpScoreboard();

   ReadScoreboard();
   DumpScoreboard();

   return 0;
}

You dont really need to write the amount of records, just use feof() instead... that above format just happens to be my preference, and more allocation friendly too :)

Another thing that starting programmers will miss is how to pass arguments to scanf. It wants pointers, so the reading the string is a bit missleading since it deals with an array.
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Ghoti



Joined: 31 Dec 2005
Posts: 288
PostPosted: Mon May 22, 2006 11:14 pm    Post subject: Reply with quote
hmmm yeah well i'm almost done with my pieces of code and it works almost so i'll stick to my code but thanks for the code anyway

i still use the sceio opening tools and i have a question:

when i save now the data is put behind the data already there.

i've tried this:
Code:
i = sceIoRemove("highscore.txt");
      fdout = sceIoOpen("highscore.txt", PSP_O_WRONLY | PSP_O_CREAT | PSP_O_TRUNC, 0777);
      

this doesn't work, it is not deleted and i also tried:
Code:
i = sceIoRemove("highscore.txt");
      fdout = sceIoOpen("highscore.txt", PSP_O_WRONLY | PSP_O_CREAT, 0777);


how can i erase the file (even delete cuase the psp_o_creat creates the file when it not exist i presume.) so that the data is not put at the end but everytime overwrites the existing data?
_________________
My PSP games:

Boxy II: http://www.ghoti.nl/boxyii.php
Elementals: http://www.ghoti.nl/Elementals.php
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