C/C++ Programming Help Thread

[Mirzab14]

Can anybody tell me how I would go on about accessing flash0 via USB?

Spoiler for main.c:

#include <pspkernel.h>
#include <pspiofilemgr.h>
#include <pspmodulemgr.h>
#include <pspdisplay.h>
#include <pspdebug.h>
#include <pspusb.h>
#include <pspusbstor.h>
#include <pspthreadman.h>
#include <pspctrl.h>
#include <pspsdk.h>

/**
 * Define the module info section
 *
 * 2nd arg must 0x1000 so __init is executed in
 * kernelmode for our loaderInit function
 */
PSP_MODULE_INFO("USBSample", 0x1000, 1, 0);

/**
 * THREAD_ATTR_USER causes the thread that the startup
 * code (ctr0.c) starts this program in to be in usermode
 * even though the module was started in kernelmode
 */
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER);

/* Define printf, just to make typing easier */
#define printf  pspDebugScreenPrintf

//make this global so we can check it in the exit_callback
u32 state;

/**
 * Function that is called from _init in kernelmode before the
 * main thread is started in usermode.
 */
__attribute__ ((constructor))
void loaderInit()
{
    pspKernelSetKernelPC();
    pspSdkInstallNoDeviceCheckPatch();
    pspDebugInstallKprintfHandler(NULL);
}

/* Exit callback */
int exit_callback(int arg1, int arg2, void *common)
{
    int retVal;

    //cleanup drivers
    if (state & PSP_USB_ACTIVATED) {
        retVal = sceUsbDeactivate(0);
        if (retVal != 0)
            printf("Error calling sceUsbDeactivate (0x%08X)\n", retVal);
    }
    retVal = sceUsbStop(PSP_USBSTOR_DRIVERNAME, 0, 0);
    if (retVal != 0)
        printf("Error stopping USB Mass Storage driver (0x%08X)\n",
               retVal);

    retVal = sceUsbStop(PSP_USBBUS_DRIVERNAME, 0, 0);
    if (retVal != 0)
        printf("Error stopping USB BUS driver (0x%08X)\n", retVal);

    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;
}

//helper function to make things easier
int LoadStartModule(char *path)
{
    u32 loadResult;
    u32 startResult;
    int status;

    loadResult = sceKernelLoadModule(path, 0, NULL);
    if (loadResult & 0x80000000)
        return -1;
    else
        startResult =
            sceKernelStartModule(loadResult, 0, NULL, &status, NULL);

    if (loadResult != startResult)
        return -2;

    return 0;
}

int main(void)
{
    SceCtrlData pad;
    u32 oldButtons = 0;
    u32 retVal;

    state = 0;
    pspDebugScreenInit();
    pspDebugScreenClear();
    SetupCallbacks();

    //setup Pad
    sceCtrlSetSamplingCycle(0);
    sceCtrlSetSamplingMode(0);

    //print header now in case we have any errors
    printf("USB Sample v1.0 by John_K - Based off work by PSPPet\n");

    //start necessary drivers
    LoadStartModule("flash0:/kd/semawm.prx");
    LoadStartModule("flash0:/kd/usbstor.prx");
    LoadStartModule("flash0:/kd/usbstormgr.prx");
    LoadStartModule("flash0:/kd/usbstorms.prx");
    LoadStartModule("flash0:/kd/usbstorboot.prx");

    //setup USB drivers
    retVal = sceUsbStart(PSP_USBBUS_DRIVERNAME, 0, 0);
    if (retVal != 0) {
        printf("Error starting USB Bus driver (0x%08X)\n", retVal);
        sceKernelSleepThread();
    }
    retVal = sceUsbStart(PSP_USBSTOR_DRIVERNAME, 0, 0);
    if (retVal != 0) {
        printf("Error starting USB Mass Storage driver (0x%08X)\n",
               retVal);
        sceKernelSleepThread();
    }
    retVal = sceUsbstorBootSetCapacity(0x800000);
    if (retVal != 0) {
        printf
            ("Error setting capacity with USB Mass Storage driver (0x%08X)\n",
             retVal);
        sceKernelSleepThread();
    }
    retVal = 0;

    //if everything worked we now enter our main loop
    for (;;) {

        sceCtrlReadBufferPositive(&pad, 1);
        state = sceUsbGetState();
        pspDebugScreenSetXY(0, 0);
        printf("USB Sample v1.0 by John_K - Based off work by PSPPet\n\n");
        printf("%-14s: %s\n", "USB Driver",
               state & PSP_USB_ACTIVATED ? "activated     " :
               "deactivated");
        printf("%-14s: %s\n", "USB Cable",
               state & PSP_USB_CABLE_CONNECTED ? "connected    " :
               "disconnected");
        printf("%-14s: %s\n", "USB Connection",
               state & PSP_USB_CONNECTION_ESTABLISHED ? "established" :
               "not present");
        printf("\nPress X to establish or destroy the USB connection\n");

        if (oldButtons != pad.Buttons) {
            if (pad.Buttons & PSP_CTRL_CROSS) {
                if (state & PSP_USB_ACTIVATED)
                    retVal = sceUsbDeactivate(0x1c8);
                else
                    retVal = sceUsbActivate(0x1c8);
            }
        }
        oldButtons = pad.Buttons;
        sceDisplayWaitVblankStart();
    }


    //Exit program
    sceKernelExitGame();

    return 0;
}

What would have to be edited so I can use flash0 on USB instead of Mem Stick? I think I might have to mount flash0, but im not sure how.

[Slasher]

Nvm

[yaustar]

with OSL you declare it like:

OSL_COLOR*

Why a pointer?

[Xsjado7]

thats just the way its declared

OSL_COLOR *white;

[yaustar]

thats just the way its declared

OSL_COLOR *white;

No it isn't, looking at the samples on his page (Super Patrick II), line 191:

const OSL_COLOR couleurMasque = RGB(255, 0, 255);

It is a typedef base type so I honestly can't see a reason why it should be a pointer.

[slicer4ever]

yaustar is correct as someone who uses the oslib for a gfx's library you can take my word, colors do not require pointer's even if images, fonts, and sounds do

[Moose]

Thanks guys, I decided to bin the colours and use an arrow pointer.

[eldiablov]

*Grumbles at Moose*

[Moose]

I might try colours again but not any time soon.

[devos50]

hi again,

is it also possible to load instead of .png's .bmp's or .jpeg with a library???:o , because I can use it very well:Jump:

[eldiablov]

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

I think ...

[devos50]

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

[Archaemic]

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

[devos50]

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?

[ernos]

if youre using SDL its the same line of code.

SDL_Surface *image;
image = IMG_Load(file);

[slicer4ever]

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

[Archaemic]

if youre using SDL its the same line of code.

SDL_Surface *image;
image = IMG_Load(file);

You need SDL_image for that, actually.

[spike021]

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?

[Archaemic]

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

[spike021]

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.

[slicer4ever]

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

Spoiler for first function:

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:

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?

[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

[yaustar]

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?

[slicer4ever]

no i don't get a stck overflow exception

structures:

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;

[yaustar]

What is in the Tile struct?

Try this function:

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:

 e = SetupEnemy(&g);

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

[Bubbletune]

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

[spike021]

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

[slicer4ever]

What is in the Tile struct?

Try this function:

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:

 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

[yaustar]

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.

[slicer4ever]

bleh classes i prefer structures atm