libfat 1.0.2 fopen methode fails sometimes?

Hi everybody,

I am facing the following problem with the new libfat 1.0.2 library.

For some unknown reason sometimes a file (highscore.xml) stored on the SD(HC) card is not found during start up of my game. The previous version of libfat did not have this problem. Do anybody know a solution for this issue.

Sample code

void loadHighScoreFile(char* filename)
{
int i;
FILE *fp;
mxml_node_t *tree=NULL;
mxml_node_t *data=NULL;
const char *tmp;
char temp[100];

/*Load our xml file! */
fp = fopen(filename, "r");
if (fp!=NULL)
{
tree = mxmlLoadFile(NULL, fp, MXML_NO_CALLBACK);
fclose(fp);

for(i=0; i<=MAX_LEVEL; i++)
{
sprintf(temp, "level%d", i);
data = mxmlFindElement(tree, tree, temp, NULL, NULL, MXML_DESCEND);

tmp=mxmlElementGetAttr(data,"localTime");
if (tmp!=NULL) highscores.localTime=atoi(tmp); else highscores.localTime=0;

tmp=mxmlElementGetAttr(data,"levelTime");
if (tmp!=NULL) highscores.levelTime=atoi(tmp); else highscores.levelTime=0;

tmp=mxmlElementGetAttr(data,"player1Score");
if (tmp!=NULL) highscores.player1Score=atoi(tmp); else highscores.player1Score=0;

tmp=mxmlElementGetAttr(data,"player2Score");
if (tmp!=NULL) highscores.player2Score=atoi(tmp); else highscores.player2Score=0;
}
}
else
{
// If file not found, create empty highscore list.
for(i=0; i<=MAX_LEVEL; i++)
{
highscores.localTime=0;
highscores.levelTime=0;
highscores.player1Score=0;
highscores.player2Score=0;
}
}
mxmlDelete(data);
mxmlDelete(tree);
}


wplaat



Edited 1 time(s). Last edit at 12/25/2008 02:23PM by wplaat.

You're using the mxml library right?

I noticed similiar problems in libwiisprite and I fixed them using a more specific directory. This is because libfats default directory is no longer the folder your apps boot.dol is in.

Ex: data/fileiwanted.extension had to be changed to /apps/folderformyapp/data/fileiwanted.extension

Hope that helps.



Edited 1 time(s). Last edit at 12/25/2008 04:28PM by Arikado.

I don't have a solution, but I do have a debugging suggestion. Since fopen() can fail for multiple reasons, I'd check what's in 'errno' to find what the exact error is. I'd add something like this when you check fp for NULL:

#include <errno.h>
...
if (fp == NULL) {
  fprintf(stderr, "ERROR: %s\n", strerror(errno));
}

Hi Everybody,

I added now the complet path (as mention by Arikado) and it is working stable. Relative paths do not work anymore stable with libfat 1.0.2 is my conclusion.

Happy New Year!

wplaat

I really hope this will be remedied soon.