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Homebrew PS2, PSP & PS3 Development Discussions
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Heretic
Joined: 02 Feb 2006
Posts: 33
Location: Pittsburgh, PA, USA
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 Posted: Fri Apr 07, 2006 1:58 am Post subject: Quick rundown of file IO? |
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I haven't really done anything with the psp file IO API yet, but now it seems necessary for me to learn a thing or 2.
I have been using fopen, fread, fwrite, etc for all my file needs, and it has been working fine, but now i need the ability to scan a directory for all files contained within. I looked at the sdk and decided i need sceIoDopen and sceIoDread (i think), so now i'm trying to get them working... to no avail. My problems are:
A) relative filepaths seem to not work at all... this isnt a horrible problem, but i'd rather not use absolute paths if possible.
B) after trying a relative path, i get error code 12 (0xC), the same as when i try an absolute path beginning with "ms0:/"
C) Using "device:/PSP/GAME/MyFolder/MySubfolder/" gives me (i believe) a good return SceUID, but then when i try to read files from it, it doesnt return anything.
Anyway, here's what I have and my output, any help would be appreciated:
| Code: |
// Note that the folder device:/PSP/GAME/LatestBreakIn/data/ contains the
// file bgpic.raw. This is what I would love to see output...
int res, i, j;
SceIoDirent info;
SceUID fdesc = sceIoDopen("device:/PSP/GAME/LatestBreakIn/data/");
sprintf(buf,"Code: %x",(int)fdesc);
for(i=0;i<300;i++)
{
Print(0,1,0xFF,buf);
CopyBuf();
}
res = sceIoDread(fdesc,&info);
if(res<0)
for(i=0;i<300;i++)
{
Print(0,0,0xFF,"Error opening thingy.");
CopyBuf();
}
else
for(i=0;i<300;i++)
{
Print(1,2,0xFF,info.d_name);
CopyBuf();
}
/*
Output:
"Code: 80020321"
"Error opening thingy."
*/
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So any help again would help me tremendously. Thanks in advance.
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TyRaNiD
Joined: 18 Jan 2004
Posts: 918
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| Posted: Fri Apr 07, 2006 2:59 am Post subject: |
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| You might as well use the unix style opendir/readdir/closedir which is provided with the toolchain. That will work with relative paths in theory and you require less hassle than using the sony api directly. |
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Heretic
Joined: 02 Feb 2006
Posts: 33
Location: Pittsburgh, PA, USA
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| Posted: Fri Apr 07, 2006 4:02 am Post subject: |
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I wasn't aware there was anything like that. How would I go about using them? Maybe just a small sample line of code would be all, but ill look it up on google in the meantime.
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TyRaNiD
Joined: 18 Jan 2004
Posts: 918
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| Posted: Fri Apr 07, 2006 4:19 am Post subject: |
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| Just do a search for it, it is the same as it is on a unix system so there will be plenty of examples around. |
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Heretic
Joined: 02 Feb 2006
Posts: 33
Location: Pittsburgh, PA, USA
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| Posted: Fri Apr 07, 2006 5:20 am Post subject: |
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Is there a directive (or whatever its called) for the dirent.h library? like how math needs -lm etc.?
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TyRaNiD
Joined: 18 Jan 2004
Posts: 918
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| Posted: Fri Apr 07, 2006 6:05 am Post subject: |
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| Nope, it is part of libc so you shouldn't need to add anything. However ensure you dont have USE_PSPSDK_LIBC (i think that is its name) in your Makefile otherwise it wont work. |
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Heretic
Joined: 02 Feb 2006
Posts: 33
Location: Pittsburgh, PA, USA
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| Posted: Fri Apr 07, 2006 6:31 am Post subject: |
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I give up... :(
Seriously, I have the #include <dirent.h> but for some reason i think that the compiler is linking to a different header? I think this because:
The header I thought I was using defines two struct i use: DIR and dirent. DIR contains a SceUID and a dirent. dirent is the same as a psp struct defined somewhere else (dont remember its name).
The compiler recognized DIR as a valid variable type, but did NOT recognize dirent. This was puzzling, but since DIR contains a dirent, I tried to access that instead. This works. So I have this:
| Code: | DIR *usr = opendir("./USER_DATA/");
if(!usr)
Print(0,0,0xFF,"Error opening thingy dir.");
dirent *f = readdir(usr); //if this line is here, doesn't compile
usr->de = *(readdir(usr));
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And without the dirent *f, it compiles, even though usr->de IS a dirent. dubbaya-tee-eff?
This really sucks! Blech!
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TyRaNiD
Joined: 18 Jan 2004
Posts: 918
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| Posted: Fri Apr 07, 2006 7:15 am Post subject: |
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| That is most likely because it is struct dirent, not dirent :) |
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Heretic
Joined: 02 Feb 2006
Posts: 33
Location: Pittsburgh, PA, USA
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| Posted: Fri Apr 07, 2006 7:42 am Post subject: |
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...
...
...
...
...I hate C.
...Thank you for that tip, I iz teh n00bz0r. (Too used to using typedef...)
Goddamn son of a programming language!!!
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