C/C++ Programming Help Thread

svn co svn://svn.ps2dev.org/psp/trunk/Jpeg

I think ...

It doesn't exist:( , some1 knows if it is possible??

Lowercase j.
svn co svn://svn.ps2dev.org/psp/trunk/jpeg

great! It works:)
I've installed the library, but which header files do I have to use (and add to my makefile)? And in the script, can I do excactly the same as with the .png's?

if youre using SDL its the same line of code.

SDL_Surface *image;
image = IMG_Load(file);

hey question:

how can i make a function with passes that are optional?

i.e.:

void func(int x,int y,bool starter){
//some code
}

now than i don't always want to pass the starter bool, is their a way to make that an optional value?

edit: i figured it out now

Zitat:

---

Zitat von ernos

if youre using SDL its the same line of code.

SDL_Surface *image;
image = IMG_Load(file);

---

You need SDL_image for that, actually.

Hey guys


Awhile back(don't remember what page) I asked for help on AIs'. I have done different things, but I haven't managed to pull of what I need to for something that I am working on...


1) I will ask if anyone knows of a good tutorial/guide for doing the obvious.

2) If all I would like to do is have an object moving vertically or horizontally to follow another object, do I really need any more than the x or y variables?

Mm? You mean like this thing I made three years ago? Yeah, all I used were x/y coordinates and trigonometry.

Zitat:

---

Zitat von Archaemic

Mm? You mean like this thing I made three years ago? Yeah, all I used were x/y coordinates and trigonometry.

---

The question is, is it in C++ that you wrote it? That was similar to what I was originally thinking, but if you have multiple objects following around, you would have to set it up so that they don't hover over each other...

Could you PM the code for it? If you can, I may just be able to tailor it to my needs.

k i have a problem with 2 functions that i can't seem to fix:

Spoiler for first function:

Code:

---

Enemy SetupEnemy(Grid g){
    Enemy e;
    e.image = EnemyImages[CurrentWave];
    e.x = g.Tiles[g.ST].x+g.Tiles[g.ST].w/2;
    e.y = g.Tiles[g.ST].y+g.Tiles[g.ST].h/2;
    if(g.Tiles[g.ST].dir==0){
          e.angle=180;
    }else if(g.Tiles[g.ST].dir==1){
          e.angle=90;
    }else if(g.Tiles[g.ST].dir==2){
          e.angle=270;
    }else if(g.Tiles[g.ST].dir==3){
          e.angle=0;
    }
    e.CT = g.ST;
    e.speed=2;
    e.health=10;
    return e;
}

---

Spoiler for second function:

Code:

---

Enemy MoveEnemy(Grid g, Enemy e){
    e.x += sinf(ToRadians(e.angle))*e.speed;
    e.y -= cosf(ToRadians(e.angle))*e.speed;
    for(int x=0;x<g.GSX;x++){
          for(int y=0;y<g.GSY;y++){
              if(e.x>=g.Tiles[y+(x*g.GSX)].x && e.x<=g.Tiles[y+(x*g.GSX)].x+g.Tiles[y+(x*g.GSX)].w){
                    if(e.y>=g.Tiles[y+(x*g.GSX)].y && e.y<=g.Tiles[y+(x*g.GSX)].y+g.Tiles[y+(x*g.GSX)].h){
                        e.CT = y + (x*g.GSX);
                    }
              }
          }
    }
    if(e.x>g.Tiles[e.CT].x+g.Tiles[e.CT].w/2-e.speed && e.x<g.Tiles[e.CT].x+g.Tiles[e.CT].w/2+e.speed){
          if(e.y>g.Tiles[e.CT].y+g.Tiles[e.CT].h/2-e.speed && e.y<g.Tiles[e.CT].y+g.Tiles[e.CT].h/2+e.speed){
              if(e.CT==g.ET){
                    CurrentWave++;
                   

Spoiler for working way:

                    e.image = EnemyImages[CurrentWave];
                    e.x = g.Tiles[g.ST].x+g.Tiles[g.ST].w/2;
                    e.y = g.Tiles[g.ST].y+g.Tiles[g.ST].h/2;
                    if(g.Tiles[g.ST].dir==0){
                        e.angle=180;
                    }else if(g.Tiles[g.ST].dir==1){
                        e.angle=90;
                    }else if(g.Tiles[g.ST].dir==2){
                        e.angle=270;
                    }else if(g.Tiles[g.ST].dir==3){
                        e.angle=0;
                    }
                    e.CT = g.ST;
                    e.speed=2;
                    e.health=10;
                   

                   

Spoiler for not working way:

                    e = SetupEnemy(g);
                   

              }
              if(g.Tiles[e.CT].dir==0){
                    e.angle=180;
              }else if(g.Tiles[e.CT].dir==1){
                    e.angle=90;
              }else if(g.Tiles[e.CT].dir==2){
                    e.angle=270;
              }else if(g.Tiles[e.CT].dir==3){
                    e.angle=0;
              }
          }
    }
    return e;
}

---

now than inside the second function you can see the working way...and the non working way, as you can clearly see the working way contains the exact same code as the function it is calling in the non working way

as many of you well probably say:

hey your re-declaring the same variables
however i changed the variable names in the function as a test and it still crashes when that function is called and idk y so can someone help?

Is it possible to load an EBOOT with sceKernelLoadModule or another like function? Or, how could I strip the prx/elf from the EBOOT? I don't want to be loading the EBOOT with loadExec calls as that resets the rest of the system.

-Aura

Zitat:

---

Zitat von slicer4ever

k i have a problem with 2 functions that i can't seem to fix:

---

Put up the code for both Grid struct and Enemy struct. I would like to see what member variables in both structs.

Edit: Do you get a stack overflow exception?

no i don't get a stck overflow exception

structures:

Code:

---


typedef struct{
    OSL_IMAGE *image;
    float x;
    float y;
    int CT;
    int angle;
    int speed;
    int health;
}Enemy;


typedef struct {
    Tile Tiles[30*30];
    int ST;
    int ET;
    int GSX;
    int GSY;
}Grid;

---

What is in the Tile struct?

Try this function:

Code:

---

Enemy SetupEnemy( const Grid * pGrid ){
    Enemy e;
    e.image = EnemyImages[CurrentWave];
    e.x = pGrid->Tiles[pGrid->ST].x+pGrid->Tiles[pGrid->ST].w/2;
    e.y = pGrid->Tiles[pGrid->ST].y+pGrid->Tiles[pGrid->ST].h/2;
    if(pGrid->Tiles[pGrid->ST].dir==0){
          e.angle=180;
    }else if(pGrid->Tiles[pGrid->ST].dir==1){
          e.angle=90;
    }else if(pGrid->Tiles[pGrid->ST].dir==2){
          e.angle=270;
    }else if(pGrid->Tiles[pGrid->ST].dir==3){
          e.angle=0;
    }
    e.CT = pGrid->ST;
    e.speed=2;
    e.health=10;
    return e;
}

---

Calling it with:

Code:

---

e = SetupEnemy(&g);

---

Edit: You are using straight C and not C++ right?

Zitat:

---

Zitat von Auraomega

Is it possible to load an EBOOT with sceKernelLoadModule or another like function? Or, how could I strip the prx/elf from the EBOOT? I don't want to be loading the EBOOT with loadExec calls as that resets the rest of the system.

-Aura

---

Well, you could load the ELF inside a 64-alligned buffer and use sceKernelLoadModuleBuffer ;)
sceIoLseek to 0x20 inside the PBP, and you'll find the offset of the ELF inside there as little endian. For example, if it says 56 06 00 00, take a look at 0x00000656. Now look at 0x24 for the next part of the PBP, aka the end of the ELF :)
And there you have it, the ELF, load it into a 64-alligned buffer and use sceKernelLoadModuleBuffer and start it ;)
Will be quite tricky to put that into reality in C code though :p

Alright, I have a quick question regarding plug-ins, what type of setup would I need to start writing some?

Zitat:

---

Zitat von yaustar

What is in the Tile struct?

Try this function:

Code:

---

Enemy SetupEnemy( const Grid * pGrid ){
    Enemy e;
    e.image = EnemyImages[CurrentWave];
    e.x = pGrid->Tiles[pGrid->ST].x+pGrid->Tiles[pGrid->ST].w/2;
    e.y = pGrid->Tiles[pGrid->ST].y+pGrid->Tiles[pGrid->ST].h/2;
    if(pGrid->Tiles[pGrid->ST].dir==0){
          e.angle=180;
    }else if(pGrid->Tiles[pGrid->ST].dir==1){
          e.angle=90;
    }else if(pGrid->Tiles[pGrid->ST].dir==2){
          e.angle=270;
    }else if(pGrid->Tiles[pGrid->ST].dir==3){
          e.angle=0;
    }
    e.CT = pGrid->ST;
    e.speed=2;
    e.health=10;
    return e;
}

---

Calling it with:

Code:

---

e = SetupEnemy(&g);

---

Edit: You are using straight C and not C++ right?

---

i'm using c++ but no more worries i'm using an alternative method

Zitat:

---

Zitat von slicer4ever

i'm using c++ but no more worries i'm using an alternative method

---

Then please use classes and member functions. At the moment, all the code you have shown so far is C.

bleh classes i prefer structures atm

Hehe, you have a long way to go :p

Zitat:

---

Zitat von slicer4ever

bleh classes i prefer structures atm

---

In C++, structs ARE classes but defaulted to public scope instead of private.

How can I make a sound play when you hover over the game under GAME > Memory Stick? Is there a command in the makefile and what format would the sound have to be in?
-= Double Post =-
How can I make the PSP play a sound when my game is hovered over under GAME > Memory Stick? Is there a specific makefile command? If so what format would my sound have to be in?

PSP_EBOOT_SND0 = SND0.AT3 in your makefile.

The SND0.AT3 file is atrac3.

Zitat:

---

Zitat von JumpR

Well, you could load the ELF inside a 64-alligned buffer and use sceKernelLoadModuleBuffer ;)
sceIoLseek to 0x20 inside the PBP, and you'll find the offset of the ELF inside there as little endian. For example, if it says 56 06 00 00, take a look at 0x00000656. Now look at 0x24 for the next part of the PBP, aka the end of the ELF :)
And there you have it, the ELF, load it into a 64-alligned buffer and use sceKernelLoadModuleBuffer and start it ;)
Will be quite tricky to put that into reality in C code though :p

---

Ah thanks for that, I tried this exact method in the past, but foolishly forgot the address is backwards and wondered why I was getting weird (and wonderful?) results. Shame I deleted the code, oh well can't be too hard to get back again :)

-Aura

Zitat:

---

Zitat von yaustar

In C++, structs ARE classes but defaulted to public scope instead of private.

---

see that's where i get confused at, these public and private scopes i've yet to truly comprehend the diffrences so instead i ignore even declaring them to save myself the trouble

also i've semi-delved into the full functionality of a class on various other languages but i'm uncertain of how to fully use one to it's best optimazation's

Read: Thinking in C++ Vol 1
http://www.mindviewinc.com/Books/

well do

Ok, I have no idea in hell for why this isn't working:



My main.cpp is:

Spoiler for Code:

#include <oslib/oslib.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <pspctrl.h>
#include <cmath>

extern "C" {
#include "logo.h"
}

PSP_MODULE_INFO("Survival (by spike021)", 0, 1, 1);
PSP_MAIN_THREAD_ATTR(THRE AD_ATTR_USER | THREAD_ATTR_VFPU);


const int NUM_enemies = 5;
const int dmg = 5;

float totalhealth, health;
float dx, dy;

int mx, my, yyy;
int score;
bool paused;

OSL_IMAGE *img;
float x;
float y;
float vx;
float vy;
int angle;
int speed;

int enemies;
float theta, healthtemp;


float diff_x = enemies.x-enemies.x;
if(diff_x != 0.0f) {
float diff_y = enemies.y-enemies.y;
float ang = Math.atanf(diff_y/diff_x);


bool enemies_dead[NUM_enemies];


int counter = 0;

OSL_SOUND *music, *music2;
OSL_IMAGE *player, *menu;//took out *enemies



health = 250;
totalhealth = 250;

void Keys()
{
oslReadKeys();

if(!paused) {
//joypad (move player on the screen)
if (osl_keys->held.down) my += 3;
if (osl_keys->held.up) my -= 3;
if (osl_keys->held.left) mx -= 3;
if (osl_keys->held.right) mx += 3;

//joystick
for (int i=24;i<=120;i+=16)
{
if (osl_keys->analogX > i) mx+=1;
if (osl_keys->analogY > i) my+=1;
if (osl_keys->analogX < -i) mx-=1;
if (osl_keys->analogY < -i) my-=1;
}
}
}

void ai //thanks archaemic (originally from actionscript)


float diff_x = enemies.x-enemies.x;
if(diff_x != 0.0f) {
float diff_y = enemies.y-enemies.y;
float ang = atanf(diff_y/diff_x);
if (diff_x<0.0f) {
ang += M_PI;
}
enemies.x += cosf(ang)2;
enemies.y += sinf(ang)2;
}




if (osl_keys->pressed.start);
{
paused = !paused;
yyy = -10;
}

float distance(float x1, float y1, float x2, float y2) {
return ( sqrtf( pow( (x2-x1), 2) + pow( (y2-y1), 2) ) );
}


int exit_callback(int arg1, int arg2, void *common) {
sceKernelExitGame();
return 0;
}

int CallbackThread(SceSize args, void *argp) {
int cbid;

cbid = sceKernelCreateCallback(" Exit Callback", exit_callback, NULL);
sceKernelRegisterExitCall back(cbid);

sceKernelSleepThreadCB();

return 0;
}



int SetupCallbacks(void) {
int thid = 0;

thid = sceKernelCreateThread("up date_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
if(thid >= 0) {
sceKernelStartThread(thid , 0, 0);
}

return thid;
}



int main(int argc, char* argv[])

{
logo();
oslDrawImage (menu);
oslPlaySound(music2, 0);


if(PSP_CTRL_START == true)

{
oslStopSound(music2);

oslInit(0); //The lib
oslInitGfx(OSL_PF_8888, 1); //Gfx
oslInitConsole(); //Text
oslInitAudio();


// a game always has sound
music = oslLoadSoundFile("awakeni ng.bgm", OSL_FMT_STREAM);
music2 = oslLoadSoundFile("dawn.bg m", OSL_FMT_STREAM);
oslAssert(music); //Debug: verify that it could be loaded


oslPlaySound(music, 0);



// loading of the sprites/images
player = oslLoadImageFile("Pics/player.png", OSL_IN_RAM, OSL_PF_8888);
menu = oslLoadImageFile("Pics/menu.png" , OSL_IN_RAM, OSL_PF_8888);
enemies = oslLoadImageFile("Pics/enemies.png", OSL_IN_RAM, OSL_PF_8888);


oslStartDrawing();
while(!osl_keys->pressed.start)
{
oslReadKeys();
oslDrawImage(menu);
oslSyncFrame();
}
while(!osl_quit) {
Keys();
oslStartDrawing();

oslClearScreen(RGB(0,0,0) );


player->x = mx;
player->y = my;
oslDrawImage(player);
// draw player

healthtemp = health / totalhealth * 0;
if(healthtemp>80)
oslDrawGradientRect(0, 0, int (healthtemp), 15, RGBA(0,0,0,125), RGBA(0,180,0,125), RGBA(0,180,0,125), RGBA(0,0,0,125));
else
{
if(counter>=0 && counter<=25)
oslDrawGradientRect(0, 0, int (healthtemp), 15, RGBA(0,0,0,125), RGBA(180,0,0,125), RGBA(180,0,0,125), RGBA(0,0,0,125));
if(counter>40)
counter=0;
counter++;
}

}
}


oslQuit();
return 0;
}

The errors that I just don't get:


1) From one compiler:
http://img209.imageshack.us/img209/6525/errornp7.png


2) From another compiler:

Errors $ make psp-g++ -I. -I/usr/local/pspdev/psp/sdk/include -G0 -Wall -O2 -I. -I/usr/local/pspdev/psp/sdk/include -G0 -Wall -O2 -fno-exceptions -fno-rtti -D_PSP_FW_VERSION=150 -c -o main.o main.cpp main.cpp:28: error: ‘enemies’ was not declared in this scope main.cpp:28: error: ‘homer’ was not declared in this scope main.cpp:29: error: ‘enemies’ was not declared in this scope main.cpp:29: error: ‘homer’ was not declared in this scope main.cpp:30: error: ‘Math’ was not declared in this scope main.cpp:45: error: ‘NUM_ENEMIES’ was not declared in this scope main.cpp:54: error: expected constructor, destructor, or type conversion before ‘(’ token main.cpp:55: error: expected constructor, destructor, or type conversion before ‘(’ token main.cpp:58: error: expected constructor, destructor, or type conversion before ‘=’ token main.cpp:59: error: expected constructor, destructor, or type conversion before ‘=’ token main.cpp:84: error: expected initializer before ‘if’ main.cpp:88: error: expected constructor, destructor, or type conversion before ‘.’ token main.cpp:89: error: expected constructor, destructor, or type conversion before ‘.’ token main.cpp:92: error: expected unqualified-id before ‘if’ main.cpp: In function ‘int main(int, char**)’: main.cpp:165: error: ‘enemies’ was not declared in this scope make: *** [main.o] Error 1

Any help would be greatly appreciated because after a couple days of the same errors, I am greatly stressed. :Argh: :Argh:

Well, for one thing, there's no indentation. Another thing, where are the arguments to ai? A third thing. diff_x and diff_y are always 0 in the version you have there. The first part of the diffs are supposed to be the thing it's homing in on. Note the subtle difference between "homee" and "homer" in the code I gave you.

Also, I guess I ended up answering your question anyway. Bad me! I should be working on my midterm.

spike - include cmath first...

Zitat:

---

Zitat von Archaemic

Well, for one thing, there's no indentation. Another thing, where are the arguments to ai? A third thing. diff_x and diff_y are always 0 in the version you have there. The first part of the diffs are supposed to be the thing it's homing in on. Note the subtle difference between "homee" and "homer" in the code I gave you.

Also, I guess I ended up answering your question anyway. Bad me! I should be working on my midterm.

---

Dam, I guess midterms are messing us both up. I wasn't even thinking I guess when I looked at your code :o

And my stupid C++ editor changed my code when I copy/pasted it from there to the message, I've got indentations, no worries there :)

I did change those things and as soon as I can, I will try to recompile it.

Thanks again Archaemic.

The other errors there, some of those may be unrelated though, so if anyone has an idea as to what there problem is... please fill me in! :humped:

Well I searched about this and found many different things and got confused. I'd like to know how to change the color of a pixel. Is there a function for it or do you have to do it the long way and write your own function? lol

Thanks in advance guys! :)

Zitat:

---

Zitat von SG57

spike - include cmath first...

---

Only one unidentifiable error :(


On line 41 of the said main.cpp... hmmm.

Can you post the code that has only one error..using the code tag this time? And also put a comment on line 41 so we don't have to C+P into a text editor to find line 41?

Zitat:

---

Zitat von Archaemic

Can you post the code that has only one error..using the code tag this time? And also put a comment on line 41 so we don't have to C+P into a text editor to find line 41?

---

Code float diff_x = enemies.x-enemies.x; if(diff_x != 2.0f) {//this is where the error is float diff_y = enemies.y-enemies.y; float ang = Math.atanf(diff_y/diff_x);

Zitat:

---

Zitat von spike021

Lots of code

---

Here is the root of your errors:

Code:

---

int enemies;
float theta, healthtemp;


float diff_x = enemies.x-enemies.x;

---

If enemies variable is an int, then it DOESN'T have a x member variable.

Not to mention that diff_x will always be 0.

Dam, I can't believe I wrote int. Thanks for the help guys :o

That's supposed to be != 0.0f, also. That's what was in the code I gave you.