C/C++ Programming Help Thread

Hi Guys,
After a little help with file IO .. writing/reading a file from two different buffers.
Yes I could copy them to a single buffer, and do it the normal way if there
were enough RAM, but there isn't.

Code:

---

        int f;

        f = sceIoOpen("./folder/file.txt", PSP_O_RDONLY, 0777);
        sceIoRead(f,buffer_a,10000);
        sceIoRead(f,buffer_b,20000);
        sceIoClose(f);

---

I thought the above would work, but it doesn't seem to.. any ideas? :D
-= Double Post =-
forget it, that IS the right way,
I dunno what I was doing wrong before.

ok can anyone show me how an hello world is made?

Here:
http://www.psp-programming.com/tutorials/c/lesson02.htm

wow thats hard to understand!
-= Double Post =-
i mean an hello world for the tiff sdk

Zitat:

---

Zitat von Jetlitheone

wow thats hard to understand!
-= Double Post =-
i mean an hello world for the tiff sdk

---

If you think hello world for the normal sdk is hard then I wouldn't advice you to try it with the tiffsdk

its harder?

WOAH

try learning the c language first by going here cprogramming.com

1. hi guys. i need a couple of functions in C. i can seem to find anything.. (literally)

here is what i need: (i think they should all be in one of the libs)

a function that does the sin of something.
a function that does the cosin of something.
a function that does the tangent (tan) of something.

a function that converts degrees to radians


2. ALSO, how would i "blit" a 3D model to the screen using x,y,z positionst? (in 3D)

YES, i have read BILLIONS of tutorials, looked at the samples, BUT, all of them use prespective. i want to actually "blit" a model using x,y, and z coordinates, and be able to change them.

Zitat:

---

Zitat von Grimfate126

1. hi guys. i need a couple of functions in C. i can seem to find anything.. (literally)

here is what i need: (i think they should all be in one of the libs)

a function that does the sin of something.
a function that does the cosin of something.
a function that does the tangent (tan) of something.

a function that converts degrees to radians


2. ALSO, how would i "blit" a 3D model to the screen using x,y,z positionst? (in 3D)

YES, i have read BILLIONS of tutorials, looked at the samples, BUT, all of them use prespective. i want to actually "blit" a model using x,y, and z coordinates, and be able to change them.

---

C already has built-in functions for sin, cos and tan. You just have to include math.h. The functions are named:

Code:

---

sin();
cos();
tan();

---

Zitat:

---

Zitat von homer

C already has built-in functions for sin, cos and tan. You just have to include math.h. The functions are named:

Code:

---

sin();
cos();
tan();

---

---

wat about converting degrees to radians?

Zitat:

---

Zitat von Grimfate126

a function that converts degrees to radians

---

just take degrees*(3,1415/180);

Zitat:

---

2. ALSO, how would i "blit" a 3D model to the screen using x,y,z positionst? (in 3D)

YES, i have read BILLIONS of tutorials, looked at the samples, BUT, all of them use prespective. i want to actually "blit" a model using x,y, and z coordinates, and be able to change them.

---

can't you just do,

{
ScePspFVector3 move = { 0.0f-posx, 0.0f-posy, -8.0f-posz };
sceGumTranslate( &move );
}
sceGumDrawArray( GU_TRIANGLES, GU_COLOR_8888|GU_VERTEX_3 2BITF|GU_TRANSFORM_3D,
3*12, 0, exampleobject);

?

Zitat:

---

Zitat von waterbottle

just take degrees*(3,1415/180);



can't you just do,

{
ScePspFVector3 move = { 0.0f-posx, 0.0f-posy, -8.0f-posz };
sceGumTranslate( &move );
}
sceGumDrawArray( GU_TRIANGLES, GU_COLOR_8888|GU_VERTEX_3 2BITF|GU_TRANSFORM_3D,
3*12, 0, exampleobject);

?

---

hmm. i have 2 questions about that moving code:

1.

Code:

---

ScePspFVector3 move = { 0.0f-posx, 0.0f-posy, -8.0f-posz };

---

what is the 'f' after each number? adn why is the last number 8 instead of 0?

2.

Code:

---

sceGumTranslate( &move );

---

what does that mean??




thx for helping!!! :tup: :tup:

Hmm.. Did you read these tutorials about using the GU?
http://www.psp-programming.com/code/...id=c:tutorials

Zitat:

---

Zitat von Grimfate126

hmm. i have 2 questions about that moving code:

1.

Code:

---

ScePspFVector3 move = { 0.0f-posx, 0.0f-posy, -8.0f-posz };

---

what is the 'f' after each number? adn why is the last number 8 instead of 0?

2.

Code:

---

sceGumTranslate( &move );

---

what does that mean??




thx for helping!!! :tup: :tup:

---

the f is just there becouse it's a float. I don't think you need it.

it's -8 instead of 0 becouse that positiones the object so you can see it.

sceGumTranslate( &move );

moves the position thingh accoriding to what move is.

I recommend you to do the GU tutorials
http://www.psp-programming.com/code/...id=c:tutorials

Zitat:

---

Zitat von Grimfate126

2. ALSO, how would i "blit" a 3D model to the screen using x,y,z positionst? (in 3D)

YES, i have read BILLIONS of tutorials, looked at the samples, BUT, all of them use prespective. i want to actually "blit" a model using x,y, and z coordinates, and be able to change them.

---

Check out the SDK sample in gu/cube it teaches you everything you need to know.

Zitat:

---

Zitat von waterbottle

the f is just there becouse it's a float. I don't think you need it.

it's -8 instead of 0 becouse that positiones the object so you can see it.

sceGumTranslate( &move );

moves the position thingh accoriding to what move is.

I recommend you to do the GU tutorials
http://www.psp-programming.com/code/...id=c:tutorials

---

thx! i read the tutorials. they were great!! i never even saw that site.. but i have two more (simple) questions:

in the makefile (in the first tut) at the end there is this:

Code:

---

./main.o: ./main.cpp
        $(CXX) $(CXXFLAGS) -c ./main.cpp -o ./main.o

---

what would i put there if i had like these two files:

Code:

---

main.c
bullet.c

---

and, im using C, so will that make any difference to the code/makefile?

Zitat:

---

Zitat von Grimfate126

in the makefile (in the first tut) at the end there is this:

Code:

---

./main.o: ./main.cpp
        $(CXX) $(CXXFLAGS) -c ./main.cpp -o ./main.o

---

what would i put there if i had like these two files:

Code:

---

main.c
bullet.c

---

and, im using C, so will that make any difference to the code/makefile?

---

Yes and yes. You don't need that code in your makefile - just list the files in the OBJs line.

You'll likely have to modify the code to fit with C.

Zitat:

---

Zitat von Insomniac197

Yes and yes. You don't need that code in your makefile - just list the files in the OBJs line.

You'll likely have to modify the code to fit with C.

---

what do you mean by "list the files in the obj's lines?"

and how much should i have to modify it. i think not having the structures should make it work. other than that, it should work.. shouldnt it??

oh and one more thing:

how would i blit an obj wit your lib. so far it only supports loading.
-= Double Post =-
one more thing: in the GU tuts, they use:

Code:

---

dList = malloc( 1500 );

---

what does "malloc" do? and what does the argument mean?

thx!

Zitat:

---

Zitat von Grimfate126

what do you mean by "list the files in the obj's lines?"

and how much should i have to modify it. i think not having the structures should make it work. other than that, it should work.. shouldnt it??

oh and one more thing:

how would i blit an obj wit your lib. so far it only supports loading.
-= Double Post =-
one more thing: in the GU tuts, they use:

Code:

---

dList = malloc( 1500 );

---

what does "malloc" do? and what does the argument mean?

thx!

---

You need to put the PSP down and learn some basic C mate first.

In your makefile will be a line that starts with 'OBJS =' that's your OBJS line!

'mylib' is not a lib, it's code to load an obj file, which it does perfectly.

Read some basic C tutorials to learn what malloc is used for.

Zitat:

---

Zitat von Insomniac197

You need to put the PSP down and learn some basic C mate first.

In your makefile will be a line that starts with 'OBJS =' that's your OBJS line!

'mylib' is not a lib, it's code to load an obj file, which it does perfectly.

Read some basic C tutorials to learn what malloc is used for.

---

lol. i misunderstood you. i thought you were talking about the obj loader you gave me, not the actual OBJ line. ;)

and i found out malloc does 2 minutes after posted.


sry for the confusion, and thx!:tup:

I'm trying to compile the custom firmware, proof of concept, but I keep getting an error. And the only thing I changed in it is the directory of the config file, so I know I didn't make an error. Anyone know the problem.

Code:

---

$ make
psp-gcc -I/usr/local/pspdev/psp/sdk/include/libc -I. -I/usr/local/pspdev/psp/sdk
/include -O2 -G0 -Wall  -c -o main.o main.c
psp-gcc -I/usr/local/pspdev/psp/sdk/include/libc -I. -I/usr/local/pspdev/psp/sdk
/include -O2 -G0 -Wall  -L../libs -L. -L/usr/local/pspdev/psp/sdk/lib -Telf_mips
allegrexel_psp_2.x -mno-crt0 -nostartfiles  main.o conf.o -lpspvshbridge_2 -lpsp
debug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lpsplibc -lpspnet -lpspnet_inet -
lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkernel -o vshmain.el
f
/usr/local/pspdev/lib/gcc/psp/4.0.2/../../../../psp/bin/ld: cannot find -lpspvsh
bridge_2
collect2: ld returned 1 exit status
make: *** [vshmain.elf] Error 1

---

Yes, it says the error in the message that you shown:

Code:

---

/usr/local/pspdev/lib/gcc/psp/4.0.2/../../../../psp/bin/ld: cannot find -lpspvsh
bridge_2

---

You are missing the pspvshbridge_2.a library.

Zitat:

---

Zitat von head_54us

Yes, it says the error in the message that you shown:

Code:

---

/usr/local/pspdev/lib/gcc/psp/4.0.2/../../../../psp/bin/ld: cannot find -lpspvsh
bridge_2

---

You are missing the pspvshbridge_2.a library.

---

Yeah, I seen that file, but how do I install it?
-= Double Post =-
Anyone?

post your make file please.

EDIT: I found the problem.
-= Double Post =-
Now I have a new problem. I'm trying to make a PRX that loads an EBOOT automatically at startup. I used this tutorial to learn how to load EBOOTs, but when I try to compile, it doesn't work. Here's my code.

Code:

Code:

---

#include <pspkernel.h>
#include <pspdebug.h>
#include <string.h>
#include <psploadexec.h>

PSP_MODULE_INFO("EBOOTLOADER", 0x1000, 1, 1);
PSP_MAIN_THREAD_ATTR (0);
pspDebugInstallKprintfHandler (NULL);
pspDebugInstallErrorHandler (NULL);

void loadeboot()
{
//char *pbpath;
const u32 pbplen = strlen("flash0:/vsh/etc/EBOOT.PBP")+1;
struct SceKernelLoadExecParam eloader;
eloader.args = pbplen;
eloader.argp = "flash0:/vsh/etc/EBOOT.PBP";
eloader.key = NULL;
eloader.size = sizeof(eloader) + pbplen;
}

int main()
{
pspDebugScreenInit();
pspDebugScreenPrintf("Loading EBOOT..\n");
loadeboot();
}

---

Makefile:

Code:

---

TARGET = EBOOT Loader
OBJS = main.o
BUILD_PRX=1
PRX_EXPORTS=exports.exp

USE_PSPSDK_LIBC = 1

INCDIR =
CFLAGS = -O2 -G0 -Wall
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)

LIBDIR =

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

---

Error:

Code:

---

$ make
psp-gcc -I/usr/local/pspdev/psp/sdk/include/libc -I. -I/usr/local/pspdev/psp/sdk
/include -O2 -G0 -Wall  -c -o main.o main.c
main.c:8: error: syntax error before '(' token
main.c:9: error: syntax error before '(' token
make: *** [main.o] Error 1

---

Ehm, you can't call functions outside of a function.
You'd have to do like

Code:

---

#include <pspkernel.h>
#include <pspdebug.h>
#include <string.h>
#include <psploadexec.h>

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

void loadeboot()
{
//char *pbpath;
const u32 pbplen = strlen("flash0:/vsh/etc/EBOOT.PBP")+1;
struct SceKernelLoadExecParam eloader;
eloader.args = pbplen;
eloader.argp = "flash0:/vsh/etc/EBOOT.PBP";
eloader.key = NULL;
eloader.size = sizeof(eloader) + pbplen;
if(sceKernelLoadExec("flash0:/vsh/etc/EBOOT.PBP",&eloader)<0) {pspDebugScreenPrintf("Load Failed\n");}
}

int main()
{
pspDebugInstallKprintfHandler (NULL);
pspDebugInstallErrorHandler (NULL);

pspDebugScreenInit();
pspDebugScreenPrintf("Loading EBOOT..\n");
loadeboot();
}

---

Zitat:

---

Zitat von homer

Ehm, you can't call functions outside of a function.
You'd have to do like

---

Oh, I see. The thing is, I got that code from Nathan over at PSP-programming.com. He posted in some thread, and said the code worked perfectly. Anyway, thanks.
-= Double Post =-
Sigh. I still get this error.

Code:

---

$ make
psp-gcc -I/usr/local/pspdev/psp/sdk/include/libc -I. -I/usr/local/pspdev/psp/sdk
/include -O2 -G0 -Wall  -c -o main.o main.c
main.c: In function 'main':
main.c:33: warning: control reaches end of non-void function
psp-gcc -I/usr/local/pspdev/psp/sdk/include/libc -I. -I/usr/local/pspdev/psp/sdk
/include -O2 -G0 -Wall  -L. -L/usr/local/pspdev/psp/sdk/lib -specs=/usr/local/ps
pdev/psp/sdk/lib/prxspecs -Wl,-q,-T/usr/local/pspdev/psp/sdk/lib/linkfile.prx
main.o exports.o  -lpspdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lpsplibc -
lpspnet -lpspnet_inet -lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -l
pspkernel -o EBOOT
exports.o:(.rodata.sceResident+0x4): undefined reference to `getModuleInfo'
collect2: ld returned 1 exit status
make: *** [EBOOT] Error 1

---

You need to add this to main.c

Code:

---

/* Exported function returns the address of module_info */
void* getModuleInfo(void)
{
        return (void *) &module_info;
}

---

Am I the only person that thinks the compiler gives really good error messaging?

You also need to add 'return 0;' before the end of your main function.

Zitat:

---

Zitat von Insomniac197

Am I the only person that thinks the compiler gives really good error messaging?

You also need to add 'return 0;' before the end of your main function.

---

Not everyone knows how to interpret the error messages though.

Now, I just have a simple question. I want something to happen if I press X and 3 variables are at a certain amount. For example, in Lua it would be

if pad:cross() and p1 = 1 and p2 = 1 and p3 = 1 then

But I can't figure out how to do it in C. I've tried this:

if(pad.Buttons & PSP_CTRL_CROSS) and (p1 = 1) and (p2 =1) and (p3 = 1) {

But that doesn't work either. How do I do it?

You need a double = in if statements. But it won't work anyway.
Try this:

Code:

---

if((pad.Buttons & PSP_CTRL_CROSS) && (p1 == 1) && (p2 == 1) && (p3 == 1))
{
  do something
}

---

Zitat:

---

Now, I just have a simple question. I want something to happen if I press X and 3 variables are at a certain amount.

---

homer already answered, but I would recommend reading through these tutorials (at least the first few) and taking the quizzes. It hardly takes any time at all, and you can save your questions for deciphering those crazy compiler errors. The syntax errors are easy (you should've known how to fix those, Lua errors aren't much different), but you spoke the truth, it's not always clear to us noobs how to fix some of the other ones, even when we know where there error is. :)

help
how do you change the image of your programma on PC
(not to load an image but give the (example) calculator.exe , an image)

Writing a simple XMB

Hi,
I'm trying to write a simple XMB but I'm already stuck at moving the menu left/right. If you hold the left (or right) button, I want it to move one element, wait for a sec. and then rush throught the rest (just like the PSP's original XMB. Here's what I tried:

Code:

---

while(1)
{
        sceCtrlReadBufferPositive(&pad, 1);

        if (pad.Buttons & PSP_CTRL_LEFT) {
            if(keyPressCounter == 0) {    // Pressed for the first time
                if(selComponent > 0) {    // needed lest to stop at the most left menuitem
                    selComponent--;
                    xmbMoveTo += xmbDistance;    //move it
                }
                keyPressCounter++;    // make it jump to the next part
            } else {
                if(keyPressCounter<=10) {  // wait 10 frames (little pause between press and hold)
                    sceDisplayWaitVblankStart();
                    keyPressCounter++;
                } else {
                    if(selComponent > 0) {    // move while holding
                        selComponent--;
                        xmbMoveTo += xmbDistance;
                    }
                }
            }
        } else {
            keyPressCounter = 0;
        }

        // same with PSP_CTRL_RIGHT


        if(xmbOffsetX < xmbMoveTo)
        {
            xmbOffsetX += 10;
        } else if (xmbOffsetX > xmbMoveTo) {
            xmbOffsetX -= 10;
        }

        // draw the menu according to xmbOffsetX
}

---

What it does is move from one end to the other once you press (not hold) a key.
-= Double Post =-
I changed the waitingtime ( if(keyPressCounter<=10) ) to 100 and it seems he doesn't even go there!
-= Double Post =-
I added some debug-messages everywhere "xmbMoveTo" is being altered and I got proof: He never gets to the hold-thebutton-part
-= Double Post =-
Can anyone please tell me that this should work? Or maybe have an idea (i don't even need complete code) how to do this otherwise?

if this is the whole code i can tell you that you forgot a

int main() {
youre code here
}
-= Double Post =-
now to my question does anyone now a good tut's for making games on a windows PC

>if this is the whole code
(of course) it isn't

Zitat:

---

Zitat von Lukeson

>if this is the whole code
(of course) it isn't

---

well i just tried to help you hmf:Cry:

Zitat:

---

Zitat von PSP-Maniac

well i just tried to help you hmf:Cry:

---

^^ ok, thank you

I just found the cause of the problem.

does anyone now a good tut for making games on a windows PC

someone??

Zitat:

---

Zitat von PSP-Maniac

does anyone now a good tut for making games on a windows PC

someone??

---

That is a REALLY broad question.

For C/C++: http://parabellumgames.no-ip.org/articles/ (Many links inside the article)

However, Python is one of the easiest langauges to grasp and allows you to learn the concepts easily. Used with Pygame (SDL bindings) and you can easily make games out of it.

Another alternative is C# (a great OO language) with the ever improving XNA SDK. However this limits you to the PC and Xbox360 for development.

If you can be more specific in your question then it will be much easier to give you a direction.

In general, this will be a good start: http://gpwiki.org/