C/C++ Programming Help Thread

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Zitat von MrChaos

I'm trying to figure out how to make a varible stay 0 ONLY if no buttons are being pressed...I can't figure out how to do that..Can anyone help?

If I try, the varible will always be 0, so there's gotta be someway..

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Did u miss my post few pages back?

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Zitat von MrChaos

I'm trying to figure out how to make a varible stay 0 ONLY if no buttons are being pressed...I can't figure out how to do that..Can anyone help?

If I try, the varible will always be 0, so there's gotta be someway..

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I've been using this in an app I've been working on, not sure if this is what you want though...

Code:

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int button;        //global
SceCtrlData pad;    //another global, can be used here, or made local

void buttoncheck(SceSize args, void* argp)
{
    //sceCtrlData pad;                  //un-comment if using as a local
    while(1){
    sceCtrlReadBufferPositive(&pad, 1);
    if(pad.Buttons & 0xFFFF) button = 1;
    sceCtrlReadBufferNegatve(&pad, 1);  //only use if required
    if(pad.Buttons & 0xFFFF) button = 0; // ||  || ||  ||
    sceKernelDelayThread(10000);        //make sure other threads get processing time
            }
}

void buttoncheckinit(SceSize args, void* argp)
{
    SceUID buttonchect = sceKernelCreateThread("buttoncheck", buttoncheck, 0x30, 0x10000, 0, NULL);
    sceKernelStartThread(buttoncheckt, args, argp);
}

int main(SceSize args, void* argp)
{
    buttoncheckinit(args, argp);
   
    //rest of code here
}

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-Aura

code:

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sprintf(buffer,"Hello");
printf("%s",buffer);
sprintf(buffer,"Hi");
printf("%s",buffer);

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result:

Hello
Hillo


but i need:

Hello
Hi


does anyone know how to clear buffer? i tried free(buffer) but that just freezes my app

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Zitat von myschoo

code:



result:

Hello
Hillo


but i need:

Hello
Hi


does anyone know how to clear buffer? i tried free(buffer) but that just freezes my app

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I'm not sure, but putting

Code:

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buffer = "";

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may do the trick, I think you can also NULL it, but again, I'm not totally sure.

Alternatively, you could do...

Code:

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sprintf(buffer,"Hello");
printf("%s",buffer);
sprintf(buffer,"Hi");
printf("%0.2s",buffer);

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which will only give the first 2 letters, this probably will get tedious and if you're using variable length, then its not going to really be suitable, but I do know for a fact that works.

As for free(buffer) not working, thats freeing up the memory, when you then try and sprint, it has nowhere to actually store the value and causes a buffer overflow.

-Aura

thx i will try it ;)

also tried to use memset and still same problem o_O

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Zitat von myschoo

thx i will try it ;)

also tried to use memset and still same problem o_O

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While I think about it, if you put

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sprintf(buffer, "Hi\0");

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it should also work, seeing as \0 is the NULL flag, and I'm pritty sure variables stop reading once they reach a NULL flag.

-Aura

Code:

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sprintf(buffer,"Hello");
 printf("%s",buffer);
memset(buffer, 0, sizeof(buffer));
 sprintf(buffer,"Hi");
 printf("%s",buffer);

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or bzero(buffer , sizeof(buffer) );

txh both of u.. it works

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Zitat von myschoo

code:



result:

Hello
Hillo


but i need:

Hello
Hi


does anyone know how to clear buffer? i tried free(buffer) but that just freezes my app

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u could've just done

Code:

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strcpy(buffer,"Hello");
printf("%s",buffer);
strcpy(buffer,"Hi");
printf("%s",buffer);

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edit: my bad, read wrong >_>, sorry about that

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Zitat von nataku92

That's exactly what he was doing originally... But it didn't work since "Hi" didn't completely replace the "Hello" before it.

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If you actually bothered to read both peices of code properly you would notice that the original used sprintf, and that uses strcpy.

-Aura

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Zitat von pspballer07

u could've just done

Code:

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strcpy(buffer,"Hello");
printf("%s",buffer);
strcpy(buffer,"Hi");
printf("%s",buffer);

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or even simpler:

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printf("%s\n", "Hello");
printf("%s", "Hi");

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or

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printf("Hello\n");
printf("Hi");

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Zitat von califrag

or even simpler:

Code:

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printf("%s", "Hello");
printf("%s", "Hi");

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Code:

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printf("Hello");
printf("Hi");

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would be even simplier, but I doubt anyone is going to want their program to just say
Hello
Hi
The string is going to have different values store in it no doubt, which makes both of the above useless.

-Aura

^^^^^^^^^^^^^^
listen to him ;) :D

How would I go about streaming an mp3? The only good peice of source code I've found for playing music loads it directly to memory, and needless to say, an mp3 takes a big chunk of the PSPs RAM.

-Aura

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Zitat von Auraomega

How would I go about streaming an mp3? The only good peice of source code I've found for playing music loads it directly to memory, and needless to say, an mp3 takes a big chunk of the PSPs RAM.

-Aura

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Manually Keep filling libmad's stream decoding buffer as it exhausts.

-4m psp

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Zitat von Auraomega

How would I go about streaming an mp3? The only good peice of source code I've found for playing music loads it directly to memory, and needless to say, an mp3 takes a big chunk of the PSPs RAM.

-Aura

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psp-programming.com has a tut for that

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Zitat von Auraomega

I've been using this in an app I've been working on, not sure if this is what you want though...

Code:

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int button;        //global
SceCtrlData pad;    //another global, can be used here, or made local

void buttoncheck(SceSize args, void* argp)
{
    //sceCtrlData pad;                  //un-comment if using as a local
    while(1){
    sceCtrlReadBufferPositive(&pad, 1);
    if(pad.Buttons & 0xFFFF) button = 1;
    sceCtrlReadBufferNegatve(&pad, 1);  //only use if required
    if(pad.Buttons & 0xFFFF) button = 0; // ||  || ||  ||
    sceKernelDelayThread(10000);        //make sure other threads get processing time
            }
}

void buttoncheckinit(SceSize args, void* argp)
{
    SceUID buttonchect = sceKernelCreateThread("buttoncheck", buttoncheck, 0x30, 0x10000, 0, NULL);
    sceKernelStartThread(buttoncheckt, args, argp);
}

int main(SceSize args, void* argp)
{
    buttoncheckinit(args, argp);
   
    //rest of code here
}

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-Aura

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That may be what I need, but what would be the use for sceCtrlReadBufferNegative ?

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Zitat von MrChaos

That may be what I need, but what would be the use for sceCtrlReadBufferNegative ?

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I wasn't sure if you wanted it so that it registers a 1 ONLY when a button is being pressed or not. If you want a 1 to register only when a button is pressed, then when nothing is pressed the negative kicks in, and allows the code under it to run. As I said, only use if you need it :tup:

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Zitat von pspballer07

psp-programming.com has a tut for that

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I checked on there about 5 minutes before posting here, the only tutorial I could find was for loading it all into RAM, which isn't really suitable.

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Zitat von Mr305

Manually Keep filling libmad's stream decoding buffer as it exhausts.

-4m psp

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How would I go about doing that? Limiting how much is read should be easy, but updating everytime its running low, not sure how I should do that...

-Aura

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Zitat von Auraomega

I checked on there about 5 minutes before posting here, the only tutorial I could find was for loading it all into RAM, which isn't really suitable.

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why not? you can free the memory it takes up after its done playing.

http://forums.ps2dev.org/viewtopic.php?t=8469&start=30
Mess around with that source.

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Zitat von pspballer07

why not? you can free the memory it takes up after its done playing.

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*Sigh*... because loading mp3s into RAM takes up a lot of space, and I have songs that are almost 100mb big (over an hour long) which simply won't fit into the PSPs memory.

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Zitat von Archaemic

Mess around with that source.

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Thanks, I'll take a look :)

-Aura

what about , dam whats the name again , alright the thing that sony uses to play big mp3files , youresam made one too I guess

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Zitat von Auraomega

I wasn't sure if you wanted it so that it registers a 1 ONLY when a button is being pressed or not. If you want a 1 to register only when a button is pressed, then when nothing is pressed the negative kicks in, and allows the code under it to run. As I said, only use if you need it :tup:


-Aura

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Acutally, that's exactly what I need. Thanks a bunch. :)

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Zitat von Auraomega

*Sigh*... because loading mp3s into RAM takes up a lot of space, and I have songs that are almost 100mb big (over an hour long) which simply won't fit into the PSPs memory.

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dang dude, what would you need a 100 mb song for?

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Zitat von pspballer07

dang dude, what would you need a 100 mb song for?

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Lol, I just like VNV Nation (a little too much), the song is 94.4mb big... and its not the only one (I have a few others tending towards that sort of size).

A lot of my music is over 16mb big anyway (16mb being the biggest you can get in a partition if I remember rightly?), so this is more just so I can play all my music how I want, not with Sony's crappy one that only works in the XMB :Argh:

-Aura

you dont need to copy the complete file to memory

oh i see, but I think the mp3player.c from the psp-programming tuts streams it. Did u try it?

streaming that was the word:):):)

No I'm pretty sure the mp3 player library given in the psp-programming tutes loads the entire file into memory.

After a bit of a seach I came up with this thread at ps2dev.org: http://forums.ps2dev.org/viewtopic.php?t=5089.

Specifically PeterM's code half way down the page.

It seems others have also had trouble with this, the solution is to buffer the file reading, filling the buffer from the memory stick while the at the same time playing the stream. The code seems pretty easy to follow.
He does note that it is a bit slow however.

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Zitat von Auraomega

Code:

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printf("Hello");
printf("Hi");

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would be even simplier, but I doubt anyone is going to want their program to just say
Hello
Hi
The string is going to have different values store in it no doubt, which makes both of the above useless.

-Aura

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what i was trying to get across is there is no need for having a buffer at all.. you can just do

printf("%s %02f %s", "a string", 2.5f, "another string"); or whatever you want...

printf("%s %02d %s", myCharVariable1, myIntVariable, myCharVariable2); ....

printf("Some Text %s My Int %02d More Text %s", myCharVariable1, myIntVariable, myCharVariable2);

etc etc

of course nobody will have their program just say "hello hi" that's retarded of you to think that is what I was implying.

now of course if you want to make your program twice as long and have to fill a buffer everytime you want to printf something you can always do as mentioned above and do

strcpy(buffer, "Some text");
printf("%s", buffer);

everytime you want something printed...

but then how will you get other variables in there like floats or ints?
you can't with strcpy at least not without casting.. at least as far as I know everytime I try strcpy(buffer, "%s %d", myCharVariable, myIntVariable) I get massive errors ;) (of course I know that doesn't work)

so in the end you would be left with

strcpy(buffer, "some text");
printf("%s %02d", buffer, myIntVariable);

which.. well.. nevermind just do what you want... it all works.

@psp_jono:
Cheers, the more source code the merrier :tup:

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Zitat von califrag

what i was trying to get across is there is no need for having a buffer at all.. you can just do

printf("%s %02f %s", "a string", 2.5f, "another string"); or whatever you want...

printf("%s %02d %s", myCharVariable1, myIntVariable, myCharVariable2); ....

printf("Some Text %s My Int %02d More Text %s", myCharVariable1, myIntVariable, myCharVariable2);

etc etc

of course nobody will have their program just say "hello hi" that's retarded of you to think that is what I was implying.

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I never thought you were implying that, but, if you do what you've done there, you will ALWAYS have the same text, because its not in a variable. All the other peices of code shown allow use of loops, but if you looped any code written how you've done it, there will be no variation because you just hardcode the text you want.

Your way would work fine, but its big and bulky, and taking up a lot of pointless space that could just be simplified a LOT by using sprintf.

As for the

Code:

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printf("%s %02d %s", myCharVariable1, myIntVariable, myCharVariable2);

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umm... how do you expected to get a variable into myCharVariable without using sprintf, or hell, without even using a buffer? Not going to happen.
-Aura

char myCharVar[9] = "hello all"

printf("%s",myCharVar);

this would work right? and i didnt use sprintf

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char myCharVar[9] = "hello all"

printf("%s",myCharVar);

this would work right? and i didnt use sprintf

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Actually no, it would fail because the string is too long for the buffer variable. The string constant "hello all" is actually 10 characters long because of the termenating null character at the end.
All strings should have a terminating null character at the end.

Correct code:

Code:

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char myCharVar[10] = "hello all";

printf("%s",myCharVar);

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:)

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Zitat von myschoo

char myCharVar[9] = "hello all"

printf("%s",myCharVar);

this would work right? and i didnt use sprintf

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yeah jono's right. the compiler automatically adds the '\0' null terminator to a string literal therefore 9 characters isn't enough to store your string. just let the compiler work out the size of myCharVar

char myCharVar[] = "hello all";

char hallo[5] = "hallo";
works 100% fine


before u say , i say BS
look at this from cprograming.com

Code:

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#include <iostream>

using namespace std;

int main()
{
  int x;
  int y;
  int array[8][8]; // Declares an array like a chessboard
 
  for ( x = 0; x < 8; x++ ) {
    for ( y = 0; y < 8; y++ )
      array[x][y] = x * y; // Set each element to a value
  }
  cout<<"Array Indices:\n";
  for ( x = 0; x < 8;x++ ) {
    for ( y = 0; y < 8; y++ )
      cout<<"["<<x<<"]["<<y<<"]="<< array[x][y] <<" ";
    cout<<"\n";
  }
  cin.get();
}

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Zitat von hallo007

char hallo[5] = "hallo";
works 100% fine


before u say , i say BS
look at this from cprograming.com

Code:

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#include <iostream>

using namespace std;

int main()
{
  int x;
  int y;
  int array[8][8]; // Declares an array like a chessboard
 
  for ( x = 0; x < 8; x++ ) {
    for ( y = 0; y < 8; y++ )
      array[x][y] = x * y; // Set each element to a value
  }
  cout<<"Array Indices:\n";
  for ( x = 0; x < 8;x++ ) {
    for ( y = 0; y < 8; y++ )
      cout<<"["<<x<<"]["<<y<<"]="<< array[x][y] <<" ";
    cout<<"\n";
  }
  cin.get();
}

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i'm not a c++ programmer so i'm not qualified to comment on that code but i fail to see what a 2 dimensional array of integers has to do with the point i was making about string literals.

maybe char hallo[5] = "hallo"; does work but that doesn't stop it being wrong

No, char hallo[5] = "hallo" will not work. "hallo" is six characters long. The double quotes alway add a null byte at the end. Therefore, even though it appears to be five characters long, it's really six.

i've just seen the point your making, hallo007 (the bolded bit)

when you declare int x[8]; it stores its values like this - x[0] for the first integer of the array and x[7] for the last. thats why the second expression of the for loop is x < 8