C/C++ Programming Help Thread

[Raphael]

i am still pretty confused on my question, i think its because of the way my code is set up. but here is most of my code

...
int main()
{

//main while loop
while (!osl_quit)
{
//To be able to draw on the screen
oslStartDrawing();

//calls the Buttons() function
Buttons();

//Draw the images to the screen
oslDrawImage(videlectrix) ;

//Ends drawing mode
oslEndDrawing();

//Synchronizes the screen
oslSyncFrame();
}

}


void Buttons()
{
//initiate the PSP's buttons
oslReadKeys();

if (osl_keys->held.down)
{
//Sprite movement
sprite->y += 2;

//Sets the sprite's position on the spritesheet
sprite_position = DOWN;

//Calls the SpriteAnimate() function
SpriteAnimate();
}
if (osl_keys->held.up)
{
sprite->y -= 2;
sprite_position = UP;
SpriteAnimate();
}

if (osl_keys->held.right)
{
sprite->x += 2;
sprite_position = RIGHT;
SpriteAnimate();
}
if (osl_keys->held.left)
{
sprite->x -= 2;
sprite_position = LEFT;
SpriteAnimate();
}

//If a button is not pressed
if (!osl_keys->held.value)
{
//Start the variable over for when a button is pressed again
sprite_march = 0;

//Sets the sprite's direction
oslSetImageTileSize(sprit e,0,sprite_position,22,35 );
}
}

the places in bold are the areas i am dealing with. the first bold is the place that i am loading my first image which works, but i want to overlap that with a second pic and a sprite with a button command. so i go to the second bold part and try to put this in.

if (osl_keys->held.cross)
{
//Draw the images to the screen
oslDrawImage(background);
oslDrawImage(sprite);
}

but it just doesnt work. what am i doing wrong?

You're drawing the thing that is supposed to be "above" the other things first, which ends up in it actually being in the "back".
Either call Buttons() AFTER your oslDrawImage(videlectrix) or seperate the drawing code from the Buttons() function and put just that after the videlectrix.

[lukespalding]

Just don't deal with dynamic memory allocation alltogether for the time being... you're still missing on basic C syntax and programming techniques which is much more important to learn. As long as you declare variables like you did, you don't have to care about freeing the memory.

And never ever call free upon an object that you didn't explicitly allocate with malloc() before.

PS: And please try to write at least halfway proper english. It's a nuisance to read your writing.

Oh, ok thankyou for informing me of that.
I'm not that bothered about free'ing memory until i need more also i can write properly in english but i've kind of picked up a bad habbit from going on msn.:Jump:

I have started just creating a basic game, text based and im going to implement loads of diffrent things like arrays etc
i learned lua fast that way so im trying it with c, lets see if it works!!!
Luke

[Mr305]

Is there any function export that let's me change XMB time / the global time setting?

Or I do need to deal with PSP's Registry?

[zeroxorxdiexskater]

You're drawing the thing that is supposed to be "above" the other things first, which ends up in it actually being in the "back".
Either call Buttons() AFTER your oslDrawImage(videlectrix) or seperate the drawing code from the Buttons() function and put just that after the videlectrix.

how do i call Buttons after the draw image? should i put a wait command or what?

[slicer4ever]

well...i don't really know how to explain this...maybe like this:

while (!osl_quit)
{
//To be able to draw on the screen
oslStartDrawing();

//calls the Buttons() function
Buttons();

//Draw the images to the screen
oslDrawImage(videlectrix) ;

//Ends drawing mode
oslEndDrawing();

//Synchronizes the screen
oslSyncFrame();
}

while (!osl_quit)
{
//To be able to draw on the screen
oslStartDrawing();


//Draw the images to the screen
oslDrawImage(videlectrix) ;

//omg i did not just do that?!!?!!?!!?!!?
//calls the Buttons() function
Buttons();

//Ends drawing mode
oslEndDrawing();

//Synchronizes the screen
oslSyncFrame();
}

[lukespalding]

Well im stuck again!
This is my code, it compiles with no errors at all but then when i go to start it, it loads up then i press down so then exit is highlight and i press upto go to start game it just exits!
WDF it is not ment to exit until i have pressed cross on the option exitgame but it exits while choosing an option.
anybody have idea's?
its puzzled me!
luke :Argh:

Spoiler for code:

#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspkernel.h>
#include <stdio.h>
#include <psppower.h>
#include "graphics.h"

#define printf pspDebugScreenPrintf

PSP_MODULE_INFO("basic", 0, 1, 1); 

#define RGB(r, g, b) ((r)|((g)<<8)|((b)<<16))

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

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

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

          sceKernelSleepThreadCB();

          return 0;
}

/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void) {
          int thid = 0;

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

          return thid;
}

int StartMenu() {

		  
  		  SceCtrlData pad;
		  Color red = RGB(255, 0, 0);
		  Color white = RGB(255,255,255);
		  
int i;
int Select = 1;
int MaxSelect = 2;

while (1)
{

sceCtrlReadBufferPositive(&pad, 1); 
					
					if(pad.Buttons & PSP_CTRL_UP) {
							if (Select == MaxSelect) {
                              Select--;
							  }
							  for(i=0; i<10; i++) {
                                        sceDisplayWaitVblankStart();
                              }
                              
							  
                    }else if(pad.Buttons & PSP_CTRL_DOWN) {
                            if (Select == 1) {
							Select++;}
							  for(i=0; i<10; i++) {
                                        sceDisplayWaitVblankStart();
                              }
                    }else if(pad.Buttons & PSP_CTRL_CROSS || Select == 2) {
								sceKernelExitGame();
								}

if (Select == 1) {
printTextScreen(334,202,"START NEW GAME",red);
printTextScreen(334,220,"EXIT",white);
}
else if (Select == 2) {
printTextScreen(334,202,"START NEW GAME", white);
printTextScreen(334,220,"EXIT",red);
}

					flipScreen();

                    for(i=0; i<1; i++) {
                              sceDisplayWaitVblankStart();
                    }
          }
		  return 0;
		  }


int main() {

scePowerSetClockFrequency(333, 333, 166);
		  pspDebugScreenInit();
          SetupCallbacks();
		  initGraphics();
		  StartMenu();
		  
		  
          return 0;
}

EDIT: it dont matter now ive fixed it i swap this . .

else if(pad.Buttons & PSP_CTRL_CROSS || Select == 2) {
sceKernelExitGame();
}

for this

else if(pad.Buttons & PSP_CTRL_CROSS) {
if (Select == 2){
sceKernelExitGame();
}}

works fine now:Jump:

[slicer4ever]

}else if(pad.Buttons & PSP_CTRL_CROSS || Select == 2) {

|| stands for or replace it with && like so:

}else if(pad.Buttons & PSP_CTRL_CROSS && Select == 2) {

that well now check to make sure the cross button is down AND that select is 2

[FreePlay]

Is there any function export that let's me change XMB time / the global time setting?

Or I do need to deal with PSP's Registry?

The time zone offset is a setting in the registry (and can be pretty much any value, down to the minute level); not sure how you change the actual clock.

[lukespalding]

}else if(pad.Buttons & PSP_CTRL_CROSS || Select == 2) {

|| stands for or replace it with && like so:

}else if(pad.Buttons & PSP_CTRL_CROSS && Select == 2) {

that well now check to make sure the cross button is down AND that select is 2

thanks for explaining that for me
Is there a c wiki orsomething with c syntax on it that i could revise?
luke

[Frenchb0ygenius]

Google it

[zeroxorxdiexskater]

well...i don't really know how to explain this...maybe like this:

while (!osl_quit)
{
//To be able to draw on the screen
oslStartDrawing();

//calls the Buttons() function
Buttons();

//Draw the images to the screen
oslDrawImage(videlectrix) ;

//Ends drawing mode
oslEndDrawing();

//Synchronizes the screen
oslSyncFrame();
}

while (!osl_quit)
{
//To be able to draw on the screen
oslStartDrawing();


//Draw the images to the screen
oslDrawImage(videlectrix) ;

//omg i did not just do that?!!?!!?!!?!!?
//calls the Buttons() function
Buttons();

//Ends drawing mode
oslEndDrawing();

//Synchronizes the screen
oslSyncFrame();
}

u know i could really go without the smart ass attitute. if you dont like replying to my posts then just dont (especially if they are not asked of u) and save the time and trouble when i simply didnt understand what he was saying

[slicer4ever]

my bad, i didn't mean to be so snappy just not a good day, i'll keep the attitude out of my posts, i'm sorry zero for the attitude

[zeroxorxdiexskater]

i know how you can feel, ill admit i AM a noob at coding and ive been here for like 2 years and i know noobs ask questions that normal people answer all the time and it gets old but this IS a help thread and i think coding is a little more complicated than an installer or something lol

[PSProgramer]

alright guys, I'm really sorry for this, but I'm a complete noob at C++ decided to start pretty recently, but I am having one main problem, and thats compiling a cpp program, because I don't know how to make a makefile for the program, can someone please guide on how to do this?? thanx, I do appreciate and appoligize for the noob question.

[Insert_Witty_Name]

See any of the 57 makefiles that ship with the SDK samples.

[PSProgramer]

those work with C++?? I thought that was all C(didn't know they worked for both languages), dang, sry. . . thanx for telling me .

EDIT: EDIT: I think I got it :)

[Khatharr]

@lukespalding:

Yeah, C is all over the net. I have a textbook that I usually end up using for referencing standard lib stuff, but I also downloaded this page for when I'm too lazy to get up and find my book:

http://www.gnu.org/software/libc/man...mono/libc.html

When you use malloc/calloc to allocate memory it's really quite imperative to free it when you're done. Otherwise, if the reference loses scope you now have a 'memory leak'. That's a section of memory that's allocated and cannot be de-allocated. If you want to change the size of your array you can use realloc(). Just remember that if you make it smaller it will remove entires from the end, so if you want to delete something from the middle then you have to manually shift everything down and then realloc to remove the last entry.

Actually, Raph is right. Wait until you _really_ need to know how to allocate and then just study using malloc and free. Once you understand those two you'll understand calloc and realloc. I think there's another malloc function called memalign too, but you probably won't need that for a long time, and you'll already know what it is when you do need it.

Have you done the tutorials at psp-programming.com?

[Durka Durka Mahn]

Could someone please explain how to use these two functions:
sceKernelResumeThread(Sce UID thid);
sceKernelSuspendThread(Sc eUID thid);

I know what they do but I don't understand how to find the game's thid. I need these for a PRX to freeze the game and resume whenever I call the functions.

Also, can someone tell me the location of the text string that shows the current game being played? I'm talking about the ULUSXXXX..etc string.

Thanks.

[Insert_Witty_Name]

The thread id is returned from sceKernelCreateThread().

To do something like what you want to do you would do something like call sceKernelGetThreadmanIdLi st() to get a list of the thread ids that are running, then suspend all of them apart from your own, do whatever you need to do, then resume all the threads.

The ULUS code type is located within the PARAM.SFO.

[Durka Durka Mahn]

On the UMD?
-=Double Post Merge =-
Sorry, for some reason quick edit isn't working for me, so I have to double post:
On the UMD?

EDIT:
Ok I found the PARAM.SFO, thanks.

How can I tell how many threads are being ran?

And also, what is the actual name for the UMD drive? Like ms0:/ for the memstick..

[Iconic_187]

What are some of the basic things I have to learn before I start learning C/C++ when I know nothing about it...?
someone please help =/

[Durka Durka Mahn]

There's really nothing you have to learn before, but you can try easier programming things first, like web content.

[Iconic_187]

What would be an example of web content?
do you mean like html and css?

[Anti-QuickJay]

On the UMD?
-=Double Post Merge =-
Sorry, for some reason quick edit isn't working for me, so I have to double post:
On the UMD?

EDIT:
Ok I found the PARAM.SFO, thanks.

How can I tell how many threads are being ran?

And also, what is the actual name for the UMD drive? Like ms0:/ for the memstick..

I think it is disc0:/

[Durka Durka Mahn]

What would be an example of web content?
do you mean like html and css?

PHP and JavaScript.

[Iconic_187]

Ok im only 15
I dont know Java or PHP how long would it take me to learn that?

[Moose]

Ok im only 15
I dont know Java or PHP how long would it take me to learn that?

That depends entirely on how often you are willing to give up to learn the language and how easily you learn languages, plus more.

[Iconic_187]

Ok lets see
I am in GATE classes lots of homework
and im on the football team that means practice for three hours umm games on fridays and I might get a job over the weekend...I am very good with languages I know how to read and write in sapnish if thats what you mean...

[MiKeY188]

Well then buy some books. If you want a basic website use .html if you want a complex website use .php

[Anti-QuickJay]

Ok lets see
I am in GATE classes lots of homework
and im on the football team that means practice for three hours umm games on fridays and I might get a job over the weekend...I am very good with languages I know how to read and write in sapnish if thats what you mean...

language as in programming.