[Tutorial] File I/O

[harleyg]

removed

[kozine]

Sweet Thanks for this! It will help me alot

[Yeldarb]

Nice =)

When it's all done, do you mind if I convert it to tutorial form and put it in the tutorials section where it'll get more traffic?

[Feldor]

well done, very usefull

[phacergei]

Very nice tutorial! I was actually about to make a tutorial on this stuff, because I am still fiddling around with PSP c programming. I made a basic text reader thing that does a similar function with outputting a text file. Your tutorial is much better than mine would have been, though.

Question: can you do "malloc()" on the PSP? I didn't think the PSP had that capability and I didn't want to risk messing it up by trying.

Also, what do you do if you have a text file that is very large (like an ebook or something), and won't display on the screen?

I found that the PSP screen is approximately 67 characters by 34 characters



 What I currently have is something like this:

Code:

char buffer[33][1000];
FILE* book;
int pg_index=0;
void Next_Page()
{
    pg_index=0;
    oslCls();
    while (fgets(buffer[pg_index], 67, book) && (pg_index < 33)) pg_index++;
    Show_Text(pg_index);
}
void Show_Text(int cmd)
{
    oslCls();
    int i;    
    oslSetTextColor(RGBA(0,0,0,255));
    oslSetBkColor(RGBA(255,255,255,255));
    if (cmd==0) oslPrintf_xy(30, 10, "No book loaded or end of book. Press square to load a book.\n\n");
    if (cmd) for(i=0; i<cmd; i++) oslPrintf("%s\n", buffer[i]);
}

So when I press x, it calls Next_Page, which reads from the file into a 2D char array, and then calls Show_Text with how many lines it read, and Show_Text oslPrintf's the lines...


It doesn't seem to work right, though


ergei

[SG57]

well... just setup a function...  have it 'check' to see if the string has reached 64 characters or not, then just inject a '\n' into it on the 64th char and ur done  Unless you want the whole word to be carried... that requires parsing and searching from 1 ' ' to the next ' ' which would drag what ever is between down with it...

I know my string manipulation

[phacergei]

well, yeah its an array of 33 strings and each is up to 67 chars long. I will make it 64 by 32 to make it even, but it should work anyway... The first page of the book displays perfectly fine, but when I press x to go to the next page, it looks fine, but It has skipped a bunch of lines.  It could be that it's skipping an entire page, I will check my code again.



ergei

[Yeldarb]

Not sure what's wrong :-\

I don't have access to the apache2.conf, nor do I know what I'd need to change.

Umm, I put it directly into mysql but it doesn't display correctly.

[Yeldarb]

It's a shared server.

[Yeldarb]

That was a pain in the ass  

[Yeldarb]

Ok, I'm working on getting yours, vaza's, and a few other misc tutorials into the tutorial section right now.

[Yeldarb]

Fixed the problem =)

Stupid apache mods...

[Yeldarb]

Are there any extra LIBS that need to be linked in the Makefile?  (I'm adapting it to be PSP C code)

Edit:
Here's what I've got: http://www.psp-programming.com/tutorials/c/file_input_1.htm

[Ryalla]

Are there any extra LIBS that need to be linked in the Makefile?  (I'm adapting it to be PSP C code)

Edit:
Here's what I've got: http://www.psp-programming.com/tutorials/c/file_input_1.htm

Nope. I just tested them out. All work 100% right off the bat. There's no makefile needed if you just gcc it. ;D

[Yeldarb]

It's gotta be aimed at the PSP, this is PSP-programming.com after all

If it's a general C tutorial and I put it up all that's going to happen is the forums will be flooded with people saying "I can't get this to work on my PSP"