C/C++ Programming Help Thread

[Anti-QuickJay]

Now I get an error when I compile LuaPlayer.
I get

Spoiler for Error:

[email protected] ~/source/LuaPLayer
$ make
psp-gcc -I. -IC:/cygwin/usr/local/pspdev/psp/sdk/include -G0 -Wall -O0 -fno-stri
ct-aliasing -mno-explicit-relocs -I/usr/local/include/freetype2 -I/usr/local/in
clude -D_PSP_FW_VERSION=150 -L. -LC:/cygwin/usr/local/pspdev/psp/sdk/lib -specs
=C:/cygwin/usr/local/pspdev/psp/sdk/lib/prxspecs -Wl,-q,-TC:/cygwin/usr/local/ps
pdev/psp/sdk/lib/linkfile.prx src/graphics.o src/sound.o src/luaplayer.o src/u
tility.o src/main.o src/framebuffer.o src/luacontrols.o src/luagraphics.o src/lu
asound.o src/luatimer.o src/luasystem.o src/luawlan.o src/lua3d.o loadlib.o src/
exports.o -llua -llualib -lpng -ljpeg -lz -lpspgum -lm -lmikmod -lmmio -L/usr/lo
cal/lib -L/usr/local/lib -lfreetype -lz -lpsprtc -lpspaudiolib -lpspaudio -lpspu
sb -lpspusbstor -lpsppower -lpspwlan -lpspgu -lpspdebug -lpsphprm_driver -lpspde
bug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lc -lpspnet -lpspnet_inet -lpspnet_
apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkernel -o luaplayer.elf
src/sound.o: In function `my_mikmod_error_handler( )':
sound.cpp:(.text+0x1c): undefined reference to `_mm_critical'
sound.cpp:(.text+0x20): undefined reference to `_mm_critical'
sound.cpp:(.text+0x34): undefined reference to `_mm_errno'
sound.cpp:(.text+0x38): undefined reference to `_mm_errno'
sound.cpp:(.text+0x4c): undefined reference to `_mm_errno'
sound.cpp:(.text+0x50): undefined reference to `_mm_errno'
sound.cpp:(.text+0x58): undefined reference to `_mm_errmsg'
sound.cpp:(.text+0x5c): undefined reference to `_mm_errmsg'
src/sound.o: In function `initMikmod()':
sound.cpp:(.text+0xa0): undefined reference to `_mm_RegisterErrorHandler '
sound.cpp:(.text+0xa8): undefined reference to `MikMod_RegisterAllLoader s'
sound.cpp:(.text+0xb0): undefined reference to `MikMod_RegisterAllDriver s'
sound.cpp:(.text+0xbc): undefined reference to `md_mode'
sound.cpp:(.text+0xc0): undefined reference to `md_mode'
sound.cpp:(.text+0xc4): undefined reference to `md_reverb'
sound.cpp:(.text+0xc8): undefined reference to `md_reverb'
sound.cpp:(.text+0xd0): undefined reference to `md_pansep'
sound.cpp:(.text+0xd4): undefined reference to `md_pansep'
sound.cpp:(.text+0xdc): undefined reference to `md_volume'
sound.cpp:(.text+0xe0): undefined reference to `md_volume'
sound.cpp:(.text+0xe8): undefined reference to `md_musicvolume'
sound.cpp:(.text+0xec): undefined reference to `md_musicvolume'
sound.cpp:(.text+0xf4): undefined reference to `md_sndfxvolume'
sound.cpp:(.text+0xf8): undefined reference to `md_sndfxvolume'
sound.cpp:(.text+0x100): undefined reference to `MikMod_Init'
sound.cpp:(.text+0x10c): undefined reference to `MikMod_SetNumVoices'
sound.cpp:(.text+0x114): undefined reference to `Player_Start'
src/sound.o: In function `unloadMikmod()':
sound.cpp:(.text+0x158): undefined reference to `MikMod_FreeSong'
sound.cpp:(.text+0x160): undefined reference to `Player_Stop'
sound.cpp:(.text+0x168): undefined reference to `MikMod_Exit'
src/sound.o: In function `stopAndUnloadMusic()':
sound.cpp:(.text+0x190): undefined reference to `Player_Stop'
sound.cpp:(.text+0x1a0): undefined reference to `MikMod_FreeSong'
src/sound.o: In function `loadAndPlayMusicFile(cha r*, int)':
sound.cpp:(.text+0x210): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x214): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x21c): undefined reference to `MikMod_LoadSong'
sound.cpp:(.text+0x244): undefined reference to `Player_Start'
src/sound.o: In function `musicPause()':
sound.cpp:(.text+0x270): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x274): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x280): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x288): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x284): undefined reference to `Player_HandleTick'
sound.cpp:(.text+0x28c): undefined reference to `Player_Stop'
src/sound.o: In function `musicResume()':
sound.cpp:(.text+0x2c0): undefined reference to `Player_Start'
sound.cpp:(.text+0x2d4): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x2d8): undefined reference to `md_musicvolume'
src/sound.o: In function `loadSound(char*)':
sound.cpp:(.text+0x304): undefined reference to `WAV_LoadFN'
src/sound.o: In function `unloadSound(SAMPLE*)':
sound.cpp:(.text+0x334): undefined reference to `WAV_Free'
src/sound.o: In function `stopSound(int)':
sound.cpp:(.text+0x364): undefined reference to `Voice_Stop'
src/sound.o: In function `setVoiceVolume(int, unsigned short)':
sound.cpp:(.text+0x540): undefined reference to `Voice_SetVolume'
src/sound.o: In function `setVoicePanning(int, unsigned long)':
sound.cpp:(.text+0x590): undefined reference to `Voice_SetPanning'
src/sound.o: In function `playSound(SAMPLE*)':
sound.cpp:(.text+0x5d4): undefined reference to `MikMod_PlaySample'
src/sound.o: In function `setVoiceFrequency(int, unsigned long)':
sound.cpp:(.text+0x660): undefined reference to `Voice_SetFrequency'
src/sound.o: In function `musicIsPlaying()':
sound.cpp:(.text+0x688): undefined reference to `Player_Active'
src/sound.o: In function `voiceIsPlaying(int)':
sound.cpp:(.text+0x6b8): undefined reference to `Voice_Stopped'
src/sound.o: In function `setMusicVolume(unsigned int)':
sound.cpp:(.text+0x718): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x71c): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x720): undefined reference to `md_musicvolume'
sound.cpp:(.text+0x724): undefined reference to `md_musicvolume'
src/sound.o: In function `setSFXVolume(unsigned int)':
sound.cpp:(.text+0x778): undefined reference to `md_sndfxvolume'
sound.cpp:(.text+0x77c): undefined reference to `md_sndfxvolume'
sound.cpp:(.text+0x780): undefined reference to `md_sndfxvolume'
sound.cpp:(.text+0x784): undefined reference to `md_sndfxvolume'
src/sound.o: In function `setReverb(unsigned int)':
sound.cpp:(.text+0x7d8): undefined reference to `md_reverb'
sound.cpp:(.text+0x7dc): undefined reference to `md_reverb'
sound.cpp:(.text+0x7e0): undefined reference to `md_reverb'
sound.cpp:(.text+0x7e4): undefined reference to `md_reverb'
src/sound.o: In function `setPanSep(unsigned int)':
sound.cpp:(.text+0x838): undefined reference to `md_pansep'
sound.cpp:(.text+0x83c): undefined reference to `md_pansep'
sound.cpp:(.text+0x840): undefined reference to `md_pansep'
sound.cpp:(.text+0x844): undefined reference to `md_pansep'
collect2: ld returned 1 exit status
make: *** [luaplayer.elf] Error 1

[email protected] ~/source/LuaPLayer
$

I am pretty sure I have both libmikmod and mikmodlib installed.

[Archaemic]

It seems like you have faulty version of libmikmod installed, seeing as it finds libmikmod.a, but can't link with them. Are you sure you specified --host psp when you configured it?

[BigSanFrey]

is there a tutorial anywhere to load externel PRXs? for 3.XX (or how to use wlanscan) :s?

[vodkkaa]

im having a strange problem where cygwin seems to be conflicting with USBhost. I recently formatted my PC but backed up my cygwin directory. at first when I copied the cygwin folder back over I had some problems but I ran cygwin setup.exe and alls well now. However USBhost functions no longer properly work. I can confirm this because when I first ran the cygwin.bat it only said bash-3.2$ but when I closed out usbhostfs.exe it works fine. Now usbhost connects and quickly disconnects

[Auraomega]

im having a strange problem where cygwin seems to be conflicting with USBhost. I recently formatted my PC but backed up my cygwin directory. at first when I copied the cygwin folder back over I had some problems but I ran cygwin setup.exe and alls well now. However USBhost functions no longer properly work. I can confirm this because when I first ran the cygwin.bat it only said bash-3.2$ but when I closed out usbhostfs.exe it works fine. Now usbhost connects and quickly disconnects

I have this problem from time to time, I've found that using a different USB port helps, every so often it ends up happening in the port I switched too, which means I am forced to switch back, its a pain, but if it helps, its worth it.

-Aura

[Xsjado7]

hey everyone,
just a quick question, how would i go about having multiple instances of an object? i wanna have to of the same object onscreen but using different coordinates. thanks

[Archaemic]

hey everyone,
just a quick question, how would i go about having multiple instances of an object? i wanna have to of the same object onscreen but using different coordinates. thanks

Um...the only way not be able to make multiple instances is to have static fields...
But something tells me you haven't abstracted the object into a class. Can we see your code?

[BigSanFrey]

is there a tutorial anywhere to load externel PRXs? for 3.XX (or how to use wlanscan) :s?

I can load an external PRX just what should the PRX look like?

E.G what should the functions be? like printf("XRFDF"); doesn't work :s?

[BlackShark]

All right, Using OSLIB, how would I get a different off Set of an image?
im trying to use a tileset, and not sure how to go to the different tiles when blitting em'

Thank you!

[placo23]

All right, Using OSLIB, how would I get a different off Set of an image?
im trying to use a tileset, and not sure how to go to the different tiles when blitting em'

Thank you!

I guess you just wanna use the function oslCreateImageTile()

It's very easy to use. Tell me if you need an example.

Cheers

[BlackShark]

an example would help!
what are the x2 and y2 for?

[Xsjado7]

Um...the only way not be able to make multiple instances is to have static fields...
But something tells me you haven't abstracted the object into a class. Can we see your code?

Dont worry about, iv got it pretty much sorted now. one question, in LUA you can use functions globally for several different objects. e.g:

collision(object)
{
object.x;
object.y;
}

and then if you put

collision(player);

it would replace the words object with player

my question is how would you do this in C? is it something like:

void collision(*char object)
{
object->x
object->y
}

and then simply

collision(player)

?

any help would be great, thanks

[yaustar]

C structs

[Xsjado7]

isnt a struct just used to group chars/ints together?

[Archaemic]

It's used to group any type of data together.

[Xsjado7]

so how does that refer to my question?

im not trying to group anything, i just want to know if my example would work or what i would have to change

[Archaemic]

Well, the syntax of your code suggested you were looking for structs.

But anyway, function invocation is a bit more complex than substitution. If it's just substitution, it's called a macro. With function invocation, data is actually passed. For instance.

#define d(e) (e = 2)
void a(int b) {
    b = 0;
}
int main() {
    int c = 1;
    a(c);
    if(c == 1) printf("This is what you will see.");
    else printf("This is not printed.");
    d(c);
    if(c == 2) printf("This is printed, though.");
    else printf("This still isn't printed.");

    return 0;
}

Try this code out. You'll see that the function a does absolutely nothing. Actually, that's not entirely true. It changes the value of b, which is the value of a copied into a local variable, which then falls out of scope, doing effectively nothing. However, because d is substituted into the function, the value of c changes after calling d. I highly discourage the use of macros. yaustar can give better reasons than I can for not using macros.

[Xsjado7]

thanks for the help. th reason is for asking is that iv got a function to check wether an object is at certain coordinates an i need to use the same code for alot of objects. for example:

if (line1->y > note1->y + notetop && line1->y < note1->y + notebottom) do something;

thats one of my few functions that im going to be using several times with different objects and i want to just be able to easily substitute note for note2 and so on instead if typing the function a whole stack of times and just changing note to note2... each time. thats the best i can explain it. it would just save me a stack of time and make my code a lot lighter. also, ididnt mean to be looking for a struct that code was just, off the top of my head, what i thought it may be. thanks for the help so far

[yaustar]

For god's sake. You asked how to do this in C and using structs was the answer.

typedef struct _Line
{
	int mX;
	int mY;
} Line;

typedef struct _Object
{
	int mX;
	int mY;
	int mWidth;
	int mHeight;
} Object;

// Using direct copy of your function
void function( Line * aLine, Object * aObject )
{
	if( NULL != aLine && NULL != aObject )
	{
		if( aLine->y > aObject->y + aObject->mWidth && aLine->y < aObject->y + aObject->mHeight )
		{
			// Do something
		}
	}
}

int main()
{
	Line someLine;
	someLine->mX = 300;
	someLine->mY = 200;
	
	Object someObject;
	someObject->mX = 320;
	someObject->mY = 200;
	someObject->mWidth = 10;
	someObject->mHeight = 20;
	
	Object someObject2;
	someObject2->mX = 220;
	someObject2->mY = 200;
	someObject2->mWidth = 20;
	someObject2->mHeight = 20;
	
	function( &someLine, &someObject );
	function( &someLine, &someObject2 );
	
	return 0;
}

[Auraomega]

I'm having a problem adding 2 functions to an app, I want to launch in different kernels, so I've been using the SDK from the Hen C, but I also want to add the option to use the NoUMD for the newer firmwares, which the library included does not allow.

I've tried using the newest library (from the 3.71 SDK), but this doesn't have the former function of changing loading kernels, I've tried adding both libraries to my app, but I get a string of errors, so my question is, is there another library that has both of these options on, and if not, is there any way I can link both libraries into the app without conflict?

Anyone?
-Aura

[JaSo PsP]

Can i just ask you yaustar, what's the difference between defining a struct type like this:

typedef struct _Test
{
    int h;
    char y;
} Test;

and this:

typedef struct
{
    int h;
    char y;
} Test;

Thanx

[yaustar]

Probably none. It is just the style I am used to.

[Raphael]

Can i just ask you yaustar, what's the difference between defining a struct type like this:

typedef struct _Test
{
    int h;
    char y;
} Test;

and this:

typedef struct
{
    int h;
    char y;
} Test;

Thanx

With the first you can also create a variable of that type by using the following:

struct _Type variable;

BTW, you can even name it like that:

typedef struct Type
{
   ...
} Type;

[SilverSpring]

For god's sake. You asked how to do this in C and using structs was the answer.

typedef struct _Line
{
    int mX;
    int mY;
} Line;

typedef struct _Object
{
    int mX;
    int mY;
    int mWidth;
    int mHeight;
} Object;

// Using direct copy of your function
void function( Line * aLine, Object * aObject )
{
    if( NULL != aLine && NULL != aObject )
    {
        if( aLine->y > aObject->y + aObject->mWidth && aLine->y < aObject->y + aObject->mHeight )
        {
            // Do something
        }
    }
}

int main()
{
    Line someLine;
    someLine->mX = 300;
    someLine->mY = 200;
    
    Object someObject;
    someObject->mX = 320;
    someObject->mY = 200;
    someObject->mWidth = 10;
    someObject->mHeight = 20;
    
    Object someObject2;
    someObject2->mX = 220;
    someObject2->mY = 200;
    someObject2->mWidth = 20;
    someObject2->mHeight = 20;
    
    function( &someLine, &someObject );
    function( &someLine, &someObject2 );
    
    return 0;
}

Small mistake: this wont compile, someLine is not pointer you'll get invalid type doing someLine->mX, either change to someLine.mX or Line *someLine (same with the others).

[yaustar]

Oops. My bad:

int main()
{
    Line someLine;
    someLine.mX = 300;
    someLine.mY = 200;
    
    Object someObject;
    someObject.mX = 320;
    someObject.mY = 200;
    someObject.mWidth = 10;
    someObject.mHeight = 20;
    
    Object someObject2;
    someObject2.mX = 220;
    someObject2.mY = 200;
    someObject2.mWidth = 20;
    someObject2.mHeight = 20;
    
    function( &someLine, &someObject );
    function( &someLine, &someObject2 );
    
    return 0;
}

[Archaemic]

So I'm trying to write a plugin to grab savegame encryption keys (because keygrabber_v2 just isn't working for me...I even tried it with the WiFi switch on because I saw a reference to that in the source), but it just isn't loading. When I try to load it from a homebrew app, it loads and runs just fine. But not as a plugin. Here's my code (it's really hack-y, I've done a lot of stuff to get apiHook working without most of PSPLink's source...and I don't even know yet if it is working, or if I'm doing it right):

#include <pspiofilemgr.h>
#include <psputility.h>
#include <psploadcore.h>
#include <pspmoduleinfo.h>
#include "apihook.h"

PSP_MODULE_INFO("uSEdown",0x1000, 0, 1);
PSP_MAIN_THREAD_ATTR(0);

static u32 sceUtilitySavedateInitStart_real = 0;

int shprintf(const char *fmt, ...) {
	return 0;
}

int sceUtilitySavedataInitStart_fake(SceUtilitySavedataParam *params) {
	SceUID keyout = sceIoOpen("ms0:/key.bin",PSP_O_WRONLY|PSP_O_CREAT,0777);
	if(keyout >= 0) {
		sceIoWrite(keyout,((char*)params)+0x5DC, 16*sizeof(char));
		sceIoClose(keyout);
	}
	return sceUtilitySavedataInitStart(params);
}

int module_start(SceSize args, void *argp) {
	sceIoClose(sceIoOpen("ms0:/ack",PSP_O_WRONLY|PSP_O_CREAT,0777));
	sceUtilitySavedateInitStart_real = apiHookByName(
		sceKernelFindModuleByName("sceUtility_Driver")->modid,"sceUtility",
		"sceUtilitySavedataInitStart",(void*)sceUtilitySavedataInitStart_fake);
	return 0;
}

My exports file:

PSP_BEGIN_EXPORTS

PSP_EXPORT_START(syslib, 0, 0x8000)
PSP_EXPORT_FUNC_HASH(module_start)
PSP_EXPORT_VAR_HASH(module_info)
PSP_EXPORT_END

PSP_END_EXPORTS

and my Makefile:

OBJS = main.o apihook.o decodeaddr.o kmode.o libs.o util.o

#CFLAGS = -G0 -O2 #Normal build
CFLAGS = -G0 -g -Wall #Debug build
LIBS = -lpsputility

TARGET = usedown
BUILD_PRX = 1
PRX_EXPORTS = exports.exp

USE_KERNEL_LIBS = 1
USE_KERNEL_LIBC = 1
LDFLAGS = -nostdlib -nodefaultlibs

PSPSDK=$(shell psp-config --pspsdk-path)
include $(PSPSDK)/lib/build.mak

I have no clue why it's not running. I've compared the source to several other plugins (e.g., keygrabber_v2 and music_plugin v0.55), but...I dunno.

[Raphael]

return sceUtilitySavedataInitStart(params);

Is there a reason why you recursively keep calling your own function?

[Archaemic]

I'm trying to call the original function, but I figured that might be what happens. ...I was going to change that call, but I forgot. Either way, that probably ISN'T why it's not loading.

E] Corrected code that will hopefully run properly. I still don't think it'll launch, though. Let me try.

#include <pspiofilemgr.h>
#include <psputility.h>
#include <psploadcore.h>
#include <pspmoduleinfo.h>
#include "apihook.h"

PSP_MODULE_INFO("uSEdown",0x1000, 0, 1);
PSP_MAIN_THREAD_ATTR(0);

typedef int (*SUSIS)(SceUtilitySavedataParam *params);
static SUSIS sceUtilitySavedataInitStart_real = 0;

int shprintf(const char *fmt, ...) {
	return 0;
}

int sceUtilitySavedataInitStart_fake(SceUtilitySavedataParam *params) {
	SceUID keyout = sceIoOpen("ms0:/key.bin",PSP_O_WRONLY|PSP_O_CREAT,0777);
	if(keyout >= 0) {
		sceIoWrite(keyout,((char*)params)+0x5DC, 16*sizeof(char));
		sceIoClose(keyout);
	}
	return sceUtilitySavedataInitStart_real(params);
}

int module_start(SceSize args, void *argp) {
	sceIoClose(sceIoOpen("ms0:/ack",PSP_O_WRONLY|PSP_O_CREAT,0777));
	sceUtilitySavedataInitStart_real = (SUSIS) apiHookByName(sceKernelFindModuleByName(
		"sceUtility_Driver")->modid,"sceUtility", "sceUtilitySavedataInitStart",
		(void*)sceUtilitySavedataInitStart_fake);
	return 0;
}

Well...hey! It launches now. Now to try and figure out why it's crashing (and there are all too many reasons it could be crashing...but it doesn't look like the stack breaking down.

...
It'd probably just be a better use of my time to get keygrabber working instead of reinventing the wheel.

So I figured out why keygrabber isn't grabbing the keys. It's not hooking the functions properly. That could do it.

[Anti-QuickJay]

How come I get this error when I try to update my PSPSDK?

$ ./toolchain.sh -p
./toolchain.sh: line 26: BUILD_SCRIPTS: bad array subscript
./toolchain.sh: line 26: : command not found
./toolchain.sh: line 26: BUILD_SCRIPTS: bad array subscript
: Failed.

[brethren]

How come I get this error when I try to update my PSPSDK?

if all you want to do is update the pspsdk component do this -

./toolchain.sh 3 6