C/C++ Programming Help Thread

_dysfunctional, PLEASE write a tutorial on Wifi!

Zitat:

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Zitat von Judas

Don't know if you found an answer, but use atoi(). This converts a string to an integer. Use it like this:

Code:

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#include <string.h>

....
fread(buffer,1,1,file);
int highscore = atoi(buffer);

---

---

Code:

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int myNum;
FILE* pFile = fopen("file.txt", "r");
/* Error Checking */ 

/* Get an variable amount of (formatted) values from a file. Similar to scanf. */
fscanf(pFile, "%d", &myNum);

---

You could do that, too.


I'll write a tutorial probably tomorrow if I have time. I have a school project due Monday.

Still having Troubles with reading the high score, and saving the new one, here is what i have so far,

Code:

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void scorecmp(int current_score)
{
    int high_score;
    FILE* fd = fopen("HI.txt","rb");
    u32 filesize = fsize(fd);
    char* buffer = (char*)malloc(filesize + 1);
    fread(&buffer,1,filesize,fd);
    high_score = atoi(buffer);
   
    if(high_score > current_score) { // do nothing
    }else if(current_score > high_score) {
          sprintf(nhscore, "%s with %d points!",lname, Score);
              FILE * pFile;
              pFile = fopen ("SCORE.txt" , "w");
              fwrite (nhscore , 1 , 29 , pFile);
              fclose (pFile);
             
              FILE * hsFile;
              hsFile = fopen ("HI.txt" , "w");
              fwrite (Score , 1 , 29 , hsFile);
              fclose (hsFile); 
    }else{      // They are equal.  DO whatever you want.
    free(buffer);
    } 
}

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and i call it with, scorecmp(Score);

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Zitat von hallo007

2 you can't call the main function

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Sure you can.

Code:

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int a = 0;

int main(void)
{
    printf("%d\n",a);
    if(!a++)
        main();
    return 0;
}

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Doesn't mean that you should, but you can.
-= Double Post =-

Zitat:

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Zitat von BlackShark

Still having Troubles with reading the high score, and saving the new one, here is what i have so far,

and i call it with, scorecmp(Score);

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You might wanna be careful with what you did in that program.

Code:

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else{      // They are equal.  DO whatever you want.
    free(buffer);
    }

---

It can lead to memory leaks since you allocate memory but you don't free the memory you allocated after you exit the function. The memory is still allocated but inaccessible because the function has ended. That is why I didn't put return; after the
"if(high_score > current_score) " because if the case is true, it will branch to the free(buffer); and still return control to the calling sub routine.

Anyway, this should work.

Code:

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void scorecmp(int current_score)
{
    int high_score;
    u32 filesize;
    FILE* fd;
    if(!fd = fopen("HI.txt","rb"))
        freopen("HI.txt","wb",fd); // Create the file if it doesn't exist.
    if(filesize = fsize(fd))          // If the file size is greater than 0.
    {
        char* buffer = (char*)malloc(filesize + 1);
        fread(&buffer,1,filesize,fd);
        high_score = atoi(buffer);
       
        if(high_score > current_score)
            ;
        else if(current_score > high_score)
        {
            FILE * pFile = fopen ("SCORE.txt" , "wb");
            fprintf(pFile,"%s with %d points!",lname,current_score);
            fclose(pFile);
           
            freopen("HI.txt","wb",fd); // reopen the file in write mode.
            fprintf(fd,"%d",current_score);    // Save the high score
        }
        else      // They are equal.  DO whatever you want.
            ;
        free(buffer);
    }

    else // if the file size is 0, then there is no high score. Save the current score as the high.
        fprintf(fd,"%d",current_score);

    fclose(fd);
}

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I've Found my "i don't see any text" problem :)
i forgot the "flipscreen();" command:Argh:

Zitat:

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Zitat von Moca

Sure you can.

Code:

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int a = 0;

int main(void)
{
    printf("%d\n",a);
    if(!a++)
        main();
    return 0;
}

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Doesn't mean that you should, but you can.

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it will work , but u know what I mean

Is it possible to use printf functions on top of an image?

And I'm getting 0x800200D9 when trying to load a .elf with pspSdkLoadStartModule... is it because I'm trying to load a .elf, or is it another reason?

-Aura

To use the printf function on top of an image, I believe you have to set the background transparent by adjusting the alpha value.

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Zitat von Judas

To use the printf function on top of an image, I believe you have to set the background transparent by adjusting the alpha value.

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I'm using the graphics.c stuff, so would I need to lower the alpha on the .png I'm blitting? Or would I be better off trying to change the way it loads?

While I'm here... what needs to be changed to convert an app to the 3.XX kernel?

-Aura

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Zitat von Auraomega

Is it possible to use printf functions on top of an image?

And I'm getting 0x800200D9 when trying to load a .elf with pspSdkLoadStartModule... is it because I'm trying to load a .elf, or is it another reason?

-Aura

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0x800200D9 means memory block allocation failed, presumably because there wasn't enough space to load it.

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Zitat von Archaemic

0x800200D9 means memory block allocation failed, presumably because there wasn't enough space to load it.

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Yeah, I looked it up, the reason I asked is because it doesn't make sense... the file is only 300kb big, and there should be a lot more space than that free...

@Judas:
I just tried increased the alpha value, but no luck, still no text appears.

-Aura

Zitat:

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Zitat von Auraomega

Yeah, I looked it up, the reason I asked is because it doesn't make sense... the file is only 300kb big, and there should be a lot more space than that free...

@Judas:
I just tried increased the alpha value, but no luck, still no text appears.

-Aura

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You need to DECREASE an alpha value to make it transparent.

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Zitat von JaSo PsP

You need to DECREASE an alpha value to make it transparent.

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Sorry, I meant to say I increased the transparency... but yeah, even with a lower alpha level I still don't see text.

-Aura

Zitat:

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Anyway, this should work.

Code:

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void scorecmp(int current_score)
{
    int high_score;
    u32 filesize;
    FILE* fd;
    if(!fd = fopen("HI.txt","rb"))
        freopen("HI.txt","wb",fd); // Create the file if it doesn't exist.
    if(filesize = fsize(fd))          // If the file size is greater than 0.
    {
        char* buffer = (char*)malloc(filesize + 1);
        fread(&buffer,1,filesize,fd);
        high_score = atoi(buffer);
       
        if(high_score > current_score)
            ;
        else if(current_score > high_score)
        {
            FILE * pFile = fopen ("SCORE.txt" , "wb");
            fprintf(pFile,"%s with %d points!",lname,current_score);
            fclose(pFile);
           
            freopen("HI.txt","wb",fd); // reopen the file in write mode.
            fprintf(fd,"%d",current_score);    // Save the high score
        }
        else      // They are equal.  DO whatever you want.
            ;
        free(buffer);
    }

    else // if the file size is 0, then there is no high score. Save the current score as the high.
        fprintf(fd,"%d",current_score);

    fclose(fd);
}

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Thanks, but theres a problem, after adding a few { and } were needed, i only have 1 problem left,

Code:

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space_game.c(166) : error: invalid lvalue in assignment

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Here is line 166, any ideas? (also, thank you for all your help so far, not just moca, but every body)

Code:

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if(!fd = fopen("HI.txt","rb")){

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if( ( fd = fopen("HI.txt","rb") ) < 0 )

fopen returns NULL, not necessarily a negative number.

Try:

Code:

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fd = fopen("hi.txt", "rb");
if(!fd)
{
    /* Error */
}

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I've made a function that edits a string, but I can't seem to return it to the calling function...

Code:

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void keyboard(char* string)
{
      string = "text\0";
}

int main()
{
    char string[256];
    keyboard(&string);
}

---

This doesn't do anything, and gives me a warning upon compilation, I have tried changing to

Code:

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*string = "text\0";

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but that gives me an lvalue error,

Code:

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keyboard(string);

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but this only removes the warning.

Can anyone tell me what I'm doing wrong?

-Aura

Strings don't work with the 'equals' operator like integers do.

Try this.

Code:

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void keyboard(char* string)
{
    memset(string, '\0', strlen(string));
    strcpy(string, "text");
}

---

Zitat:

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Zitat von _dysfunctional

Strings don't work with the 'equals' operator like integers do.

Try this.

Code:

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void keyboard(char* string)
{
    memset(string, '\0', strlen(string));
    strcpy(string, "text");
}

---

---

Ok, I was trying to cut back on my code... its a bit more complex than that...

I'm editing each letter individually, and then adding a \0 to the next byte each time, so my code looks more like...

Code:

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string[number] = 'a';
string[number+1] = '\0';

---

and I'm doing this a lot of times, the string is meant to be variable length and variable text, and as you may have guessed its to be a keyboard, using strncat would be tedious, and hard to reverse when going back a character, using this method should work... I also get an output when I use printf, so I know the string is getting written correctly, its simply getting it back to the calling function I'm having problems with.

-Aura

<_<

Code:

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void keyboard(char** string)
{
    *string = "text";
}

int main()
{
    char *string;
    keyboard(&string);
}

---

nvm, junkie answered you <_<

Ok, sorted it... the strcpy worked, but didn't give enough flexabilty, so I made a new string in my keyboard function, messed around with that string, then used strcpy at the very end to copy it back to the pointed string :tup:

-Aura

Is it possible for a plugin to call another prx?
I tried sceKernelLoadExec() and sceKernelLoadModule()/sceKernelStartModule() but had no success.
Can I have some code snippet?

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Zitat von petervaz

Is it possible for a plugin to call another prx?
I tried sceKernelLoadExec() and sceKernelLoadModule()/sceKernelStartModule() but had no success.
Can I have some code snippet?

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A snippet from my XMBE...

Code:

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    SceUID mod = sceKernelLoadModule(file, 0, NULL);
    if(mod>0) mod = sceKernelStartModule(mod, args, argp, NULL, NULL);

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I did run into some problems myself when making XMBE-S, I had to load up the plugin, and start a new thread, which may or may not seem obvious...

Code:

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int main(SceSize args, void* argp)
{
    SceUID startthread = sceKernelCreateThread("Screen_Saver", __main, 0x30, 0x10000, 0, NULL);
    sceKernelStartThread(startthread, args, argp);
    sceKernelExitDeleteThread(0);
}

---

That sorted everything out, of course, if it still refuses to load you could put some debug into it, and see if you are getting an error code when loading, just use PSPLink for that.

-Aura

Thanks Aura.
Are you passing arguments on args and argp?
The exemple I found was using zeros.

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Zitat von petervaz

Thanks Aura.
Are you passing arguments on args and argp?
The exemple I found was using zeros.

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Not that I know of, I just never tried putting 0s into a new thread, so I had to start the function with args and argp, guess using 0s should be fine.

I'm having a problem with my code, its not copying correctly, I either get too much data copied or to little data, just wondering if anyone can point out my error.

Code:

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                          while(1)
                          {
                                            fgets(byte, 1024*200, org);
                                            //byte[(1024*200)+1] = '\0';
                                            fputs(byte, nwf);
                                            pspDebugScreenSetXY(x, y);
                                            data+=(sizeof(byte));  //incorrect, edit!
                                            _printf("%u bytes", data);
                                            if(feof(org)) break;
                                            sceCtrlReadBufferPositive(&pad, 1);
                                            if(pad.Buttons & PSP_CTRL_CROSS) break;
                                           
                          }

---

-Aura

Hey folks! :)

When I make a .PRX that has exports, how do I get the function IDs (the hashes) used to import them into another program?

:)

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Zitat von Moca

Doesn't mean that you should, but you can.
-= Double Post =-

You might wanna be careful with what you did in that program.

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alright, im getting close, it works once, but then it just stops working, when i look at HI.txt on my computer, it sais its currupted... here is the function again,

Code:

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void scorecmp(int current_score)
{
    int high_score;
    u32 filesize;
    FILE* fd = fopen("HI.txt","rb");
    if(!fd) {
        pspDebugScreenPrintf("              Please create the HI.txt\n");
        pspDebugScreenPrintf("            file in the game folder...exiting");
        wait(500);
        sceKernelExitGame();
        }
    if(filesize = fsize(fd))          // If the file size is greater than 0.
    {
        char* buffer = (char*)malloc(filesize + 1);
        fread(&buffer,1,filesize,fd);
        high_score = atoi(buffer);
       
        if(high_score > current_score) {
        }else if(current_score > high_score)
        {
            FILE * pFile = fopen ("SCORE.txt" , "wb");
            fprintf(pFile,"%s with %d points!",lname,current_score);
            fclose(pFile);
           
            freopen("HI.txt","wb",fd); // reopen the file in write mode.
            fprintf(fd,"%d",current_score);    // Save the high score
        }else{    // They are equal.  DO whatever you want.
        free(buffer);
    }

    }else{ // if the file size is 0, then there is no high score. Save the current score as the high.
        fprintf(fd,"%d",current_score);

    fclose(fd);
    }
}

---

Code:

---

    * #include <stdio.h> /* pour printf */
    * #include <conio.h> /* pour getch */
    *
    * /*
    * Nouveau type de char, il prend exactement la meme place en
    * memoire qu'un vrai char.
    * C'est une union donc chaque membre de la structure occupera
    * la meme place en memoire.
    * */
    *
    * typedef union NEWCHAR
    * {
    * unsigned char dec; /* decimal */
    * struct
    * {
    * bool bit8:1; /* binaire, le :1 */
    * bool bit7:1; /* signifie que la */
    * bool bit6:1; /* variable n'intervient */
    * bool bit5:1; /* que sur un seul bit */
    * bool bit4:1; /* de la structure */
    * bool bit3:1;
    * bool bit2:1;
    * bool bit1:1;
    * };
    * struct
    * {
    * unsigned int hexa2:4; /* hexadecimal, le :4 */
    * unsigned int hexa1:4; /* pour seulement 4 bits */
    * };
    * };
    *
    * /*
    * les sous-structure de NEWCHAR ne porte pas de nom, ça permet d'acceder
    * a leurs variables comme ci elles appartenaient directement a NEWCHAR
    * et que en meme temps toutes leurs variables n'en valent qu'une seule
    * dans l'union
    * */
    *
    * int main()
    * {
    * NEWCHAR octet;
    *
    * octet.dec=173; /* octet = 173 */
    *
    * /* binaire */
    * printf("binaire : %d%d%d%d%d%d%d%d\n",octet.bit1,octet.bit2,octet.bit3,octet.bit4,octet.bit5,octet.bit6,octet.bit7,octet.bit8);
    *
    * /* hexadecimal */
    * printf("hexadecimal : ");
    * if (octet.hexa1>9) printf("%c",octet.hexa1+55);
    * else printf("%d",octet.hexa1);
    * if (octet.hexa2>9) printf("%c\n",octet.hexa2+55);
    * else printf("%d\n",octet.hexa2);
    *
    * /* decimal */
    * printf("decimal : %d",octet.dec);
    *
    * getch();
    *
    * return 0;
    * }

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is this the best way to convert a decimal to binair?

...

Code:

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char single_byte = 0x24 /*any number here*/;
for(char i = number; i; i<<=1) printf("%u",i&80);

---

...
also, why would anyone ever use getch() for anything?

I REALLY need to know how to use printf functions without the stupid background highlight, I've tried learning how to hook functions in order to do it, but I've had next to no help, so can someone either please explain what I need to do, or hand it to me on a silver platter. This is one of the only things stopping my project from being released, and I would be exceptionally pleased if someone would help.

-Aura

This is the meat of the text rendering function (for a 32-bit display mode):

Code:

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static void debug_put_char_32(int x, int y, u32 color, u32 bgc, u8 ch)
{
  int        i,j, l;
  u8        *font;
  u32  pixel;
  u32 *vram_ptr;
  u32 *vram;

  if(!init)
  {
          return;
  }

  vram = g_vram_base;
  vram += (g_vram_offset >> 2) + x;
  vram += (y * PSP_LINE_SIZE);
 
  font = &msx[ (int)ch * 8];
  for (i=l=0; i < 8; i++, l+= 8, font++)
  {
      vram_ptr  = vram;
      for (j=0; j < 8; j++)
        {
          if ((*font & (128 >> j)))
              pixel = color;
          else
              pixel = bgc;

          *vram_ptr++ = pixel;
        }
      vram += PSP_LINE_SIZE;
  }
}

---

If you take out

Code:

---

          else
              pixel = bgc;

---

It will stop drawing the background. Of course, you'll need to not build against -lpspdebug if you feel like redefining the entirety of scr_printf.c in one of your files, or rename all of the functions in scr_printf.c and use those names (with a properly adjusted header file, of course). You'll also need msx.c, as that contains the font, so it's probably better to build against -lpspdebug with a scr_printf.c with all the functions renamed

*Note that I haven't actually tried, this, I'm just assuming. It also won't give the shadow effect seen in JoySens. But you really should be able to figure out how to implement that.

Ok, thanks, I think I can go from here, the only problem is I don't have any of those c files (probably why I struggled so much in the first place) as I have a pre-compiled toolchain, could you link me, or upload all the files I'm going to need?

Thanks.
-Aura

http://svn.ps2dev.org/listing.php?re...%2F&rev=0&sc=0

Alrighty,
I have a structure,

Code:

---

typedef struct {
    int state, health, fTimer, xMove, yMove, firing, bx, by, bh, bw;
        float x, y, w, h, speed;
} ENEMY;

  ENEMY cruzer[6];

---

and I wan't to make it so that ALL of the 6 enemies of the structure do the same thing if there mode is "RIGHT" or "LEFT" etc. heres an example, i have,

Code:

---

if(cruzer[0].xMove == RIGHT) {
                            cruzer[0].x++;
                            }else if(cruzer[0].xMove == LEFT) {
                                  cruzer[0].x--;
                                }

if(cruzer[1].xMove == RIGHT) {
                            cruzer[1].x++;
                            }else if(cruzer[1].xMove == LEFT) {
                                  cruzer[1].x--;
                                }

---

This makes it so that if enemy 1(0) and enemy 2(1) is == right, then there ships move right, now would there be a way to write,

Code:

---

if(cruzer[ALL].xMove == RIGHT) {
                            cruzer[ALL].x++;
                            }else if(cruzer[ALL].xMove == LEFT) {
                                  cruzer[ALL].x--;
                                }

---

as in, have all of the ships Act the same way, with out having to write it all out? or am i just Hoping for too much?

for(int i = 0; i < 6; ++i)

Also, it's faster to write it all out because it doesn't have to run through the loop. If you have optimizations set, it should unroll the loop so you don't have to write out the whole thing.

Zitat:

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Zitat von Archaemic

http://svn.ps2dev.org/listing.php?re...%2F&rev=0&sc=0

---

Thanks for that, just wondering how to compile it now... make doesn't work, neither does make install (which is obvious as theres nothing to install). I'm not sure what other commands are available with Cygwin, and whats the one I need to use.

-Aura

Ok, I've sorted it in a different way, works amazingly well :tup:

Just for future reference, you need to do a tad more to the scr_printf.c, but you definatly got me going on the right lines :Jump:

Now my only question is, is it possible to omit libpspdebug when compiling? It adds itself automatically, but if I can remove it it would be awesome, if not I'll overwrite the library with my current one, just might want to use the original for a later purpose.

-Aura

Go to X:/cygwin/usr/local/pspdev/psp/sdk/lib

There you'll find build.mak, just take out the libraries you don't want.

Zitat:

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Zitat von Judas

Go to X:/cygwin/usr/local/pspdev/psp/sdk/lib

There you'll find build.mak, just take out the libraries you don't want.

---

Ah thanks, thats sorted it :tup:

-Aura

I'm getting an odd bug that I can't work out...

Code:

---

int __main()
 {
    char day              [15];
    char month            [15];
    char extention        [4];
    char milisec          [20];
    int batlife;
    long colour = 0;
    int colournum = 0;
   
    //outermod();
    pspDebugScreenInit();
    //buttoncheck(1);
        for(;;)
        {
        sceRtcGetCurrentClockLocalTime(&pt);
        batlife = scePowerGetBatteryLifePercent();

        getdate(day, month, extention);

        sprintf(milisec, "%i", pt.microseconds);
       
                pspDebugScreenSetXY(50, 0);
                if(pt.hour>12) _printf("%2i:%2i:%2i:%2.2sPM", (pt.hour - 12), pt.minutes, pt.seconds, milisec);
                else          _printf("%2i:%2i:%2i:%2.2sAM", pt.hour, pt.minutes, pt.seconds, milisec);
                pspDebugScreenSetXY(0, 32);
                              _printf("%s the %i%s %s %i", day, pt.day, extention, month, pt.year);
        pspDebugScreenSetXY(50, 32);
        if(batlife>=0) _printf("%i%% battery life", batlife);
        else          _printf("No battery");
                //buttoncheck(0);
                sceKernelDelayThread(10*1000);
                colournum++;
                if(colournum==50)
                {
                        colour = rand()%0xFFFFFFFF+1;
                        pspDebugScreenSetTextColor(colour);
                        colournum=0;
        }
        }
        sceKernelExitDeleteThread(0);
        return 0;
}

---

This should continually print the time, date and battery charge, but for some reason it stops printing after a while, the time is random I've seen it go for a matter of seconds, and other times for a matter of minutes, it worked fine originally with the dsx library, but I've decided to use the clear printf functions I've made, to test how it works in the vsh... since doing so I've had this problem, and it occurs even with the normal pspdebug library, so I'm just wondering if anyone can see what I've done wrong?

-Aura