C/C++ Programming Help Thread

Yaustar that code you gave me didnt work. :(

The compiler just threw up a bunch of errors.

Zitat:

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Zitat von Kwastie

hello back there,

could somehelp help me please: i've create an "theme" flasher and how can i add firwmare check, because sony added signature check for topmenu_plugin.rco at firmware 3.10 and i want to add topmenu flash option for my progam.. so how do I check wich firmware the user has?
(and would you please give an example of the code)

Greets Kwastie

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From the PSPSDK docs:

Zitat:

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int sceKernelDevkitVersion(vo id)

Get the firmware version.

Returns:
The firmware version. 0x01000300 on v1.00 unit, 0x01050001 on v1.50 unit, 0x01050100 on v1.51 unit, 0x01050200 on v1.52 unit, 0x02000010 on v2.00/v2.01 unit, 0x02050010 on v2.50 unit, 0x02060010 on v2.60 unit, 0x02070010 on v2.70 unit, 0x02070110 on v2.71 unit.

---

I'm not completely sure what it'll return on 3.x, but I think it will return 0x03010010 on 3.10.

Here's an example on what you could do in your program (there are other ways too).

Code:

---

int retVal;
int fwMode;
retVal = sceKernelDevkitVersion();

if(retVal == 0x03010010)
{
    // do something, like set firmware mode to 310 and check
    // if the mode is 310 then don't flash the topmenu_plugin.rco
    fwMode = 310;
}

// later on
if(fwMode != 310)
{
  // flash topmenu
  flashTopmenuPlugin();
}
else
{
  // notify the user that topmenus can't be flashed in 3.10OE
  errorTopmenu();
}

---

i'll give it a try :Jump: thanks

Zitat:

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Zitat von eldiablov

Yaustar that code you gave me didnt work. :(

The compiler just threw up a bunch of errors.

---

What code?

Edit: Found it:

Code:

---

#include <stdio.h>
#include <string.h>
#include <ctype.h>

enum ETeamIds
{
        TEAM_ELVES = 0,
        TEAM_DWARVES,
        TEAM_ALONE,
        TOTAL_NUMBER_OF_TEAMS
};

const char * TEAM_NAMES[TOTAL_NUMBER_OF_TEAMS] =
{
        "ELVES",
        "DWARVES",
        "ALONE"
};

const int STRING_BUFFER_LENGTH = 64;

int main( )
{
        printf( "What team do you want to be on?\n" );
       
        char inputStringBuffer[STRING_BUFFER_LENGTH] = "";
        scanf( "%s", inputStringBuffer );
       
        {
                int i = 0;
                for( i = 0; i < STRING_BUFFER_LENGTH; ++i )
                {
                        inputStringBuffer[i] = toupper( inputStringBuffer[i] );
                }
        }
       
        bool validTeamName = false;
       
        {
                int i = 0;
                for( i = 0; i < TOTAL_NUMBER_OF_TEAMS; ++i )
                {
                        if( 0 == strncmp( TEAM_NAMES[i], inputStringBuffer, STRING_BUFFER_LENGTH ) )
                        {
                                printf( "You are in team %s\n", TEAM_NAMES[i] );
                                validTeamName = true;
                                break;
                        }
                }
        }
       
        if( !validTeamName )
        {
                printf( "Invalid team choice\n" );
        }

        return 0;
}

---

Try that. (And post the errors up next time).

line 26 has 2 errors
37 and 46 have 1 error.

char inputStringBuffer[STRING_BUFFER_LENGTH] = "";

I have that line as causing problems at the moment

Zitat:

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Zitat von eldiablov

line 26 has 2 errors
37 and 46 have 1 error.

char inputStringBuffer[STRING_BUFFER_LENGTH] = "";

I have that line as causing problems at the moment

---

Although STRING_BUFFER_LENGTH is a constant, I'm not sure if C lets you pass in a variable for an array length. Try replacing STRING_BUFFER_LENGTH = 64; with #define STRING_BUFFER_LENGTH 64

but then affects the scanf line :Argh:

solved that now for line 37 and 46

now there's just an error with 46 and 52. I'll post the modified script.

Code:

---

#include <stdio.h>
#include <string.h>
#include <ctype.h>

enum ETeamIds
{
        TEAM_ELVES = 0,
        TEAM_DWARVES,
        TEAM_ALONE,
        TOTAL_NUMBER_OF_TEAMS
};

const char * TEAM_NAMES[TOTAL_NUMBER_OF_TEAMS] =
{
        "ELVES",
        "DWARVES",
        "ALONE"
};

const int STRING_BUFFER_LENGTH = 64;

int main( )
{
        printf( "What team do you want to be on?\n" );
       
#define        char inputStringBuffer[STRING_BUFFER_LENGTH] = "";
#define        scanf( "%s", inputStringBuffer );
       
        {
                int i = 0;
                for( i = 0; i < STRING_BUFFER_LENGTH; ++i )
                {
#define                        inputStringBuffer[i] = toupper( inputStringBuffer[i] );
                }
        }
       
#define        bool validTeamName = false;
       
        {
                int i = 0;
                for( i = 0; i < TOTAL_NUMBER_OF_TEAMS; ++i )
                {
                        if( 0 == strncmp( TEAM_NAMES[i], inputStringBuffer, STRING_BUFFER_LENGTH ) )
                        {
                                printf( "You are in team %s\n", TEAM_NAMES[i] );
                                validTeamName = true;
                                break;
                        }
                }
        }
       
        if( !validTeamName )
        {
                printf( "Invalid team choice\n" );
        }

        return 0;
}

---

Zitat:

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Zitat von eldiablov

line 26 has 2 errors
37 and 46 have 1 error.

char inputStringBuffer[STRING_BUFFER_LENGTH] = "";

I have that line as causing problems at the moment

---

This should work;

Code:

---

#include <stdio.h>
#include <string.h>
#include <ctype.h>

enum ETeamIds
{
        TEAM_ELVES = 0,
        TEAM_DWARVES,
        TEAM_ALONE,
        TOTAL_NUMBER_OF_TEAMS
};

const char * TEAM_NAMES[TOTAL_NUMBER_OF_TEAMS] =
{
        "ELVES",
        "DWARVES",
        "ALONE"
};

#define STRING_BUFFER_LENGTH 64
#define bool int
#define false 0
#define true 1

int main( )
{
        printf( "What team do you want to be on?\n" );
       
        char inputStringBuffer[STRING_BUFFER_LENGTH] = "";
        scanf( "%s", inputStringBuffer );
       
        {
                int i = 0;
                for( i = 0; i < STRING_BUFFER_LENGTH; ++i )
                {
                        inputStringBuffer[i] = toupper( inputStringBuffer[i] );
                }
        }
       
        bool validTeamName = false;
       
        {
                int i = 0;
                for( i = 0; i < TOTAL_NUMBER_OF_TEAMS; ++i )
                {
                        if( 0 == strncmp( TEAM_NAMES[i], inputStringBuffer, STRING_BUFFER_LENGTH ) )
                        {
                                printf( "You are in team %s\n", TEAM_NAMES[i] );
                                validTeamName = true;
                                break;
                        }
                }
        }
       
        if( !validTeamName )
        {
                printf( "Invalid team choice\n" );
        }

        return 0;
}

---

Im guessing i have to put a few getchar(); in there to stop the code from stopping everytime i press enter ?

And BTW thanks waterbottle, coolguy and Yaustar

Zitat:

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Zitat von SG57

Maybe it would benefit him more if you linked to his tutorial where it explains each part thoroughly, than copy,paste and adapt to his variable names.

Anyways, quick question - qsort; is this a built in operator (like sizeof)?

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Wow....apparently everyone has a problem with what i have to say. What is wrong with you people? You guys just can't stop flaming me. Seriously, stop trying to make me quit, it's not worth it. I'm not going to quit.

hmmm i know its a pretty broad question but does anyone know how you get a prx that you have made to remain over the xmb instead of showing just before the coldboot then closing? even if someone could show me in a simple helloworld would be a great help :) thanks

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Zitat von covandy01

hmmm i know its a pretty broad question but does anyone know how you get a prx that you have made to remain over the xmb instead of showing just before the coldboot then closing? even if someone could show me in a simple helloworld would be a great help :) thanks

---

Run it in a loop :)

I have two questions. Both related to RAM.
1. If I run a program, say it's 1MB, about how much RAM will I have to work with? I know it has 32MB, but how much is actually available.
2. After the program is loaded into the RAM, I can remove the memory stick, right? It won't need to access the EBOOT again, right? (Assuming it needs no external files.

Approximately 24mb to play with.

You can remove the memory stick as the EBOOT is loaded to RAM, as you said.

Just thought I ask before starting to code to show jpeg files, that if any one here has code for dealing with jpeg files it would be a big help with this open source graphics class that I am doing, it would save me time if any one could help.

Zitat:

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Zitat von xart

Just thought I ask before starting to code to show jpeg files, that if any one here has code for dealing with jpeg files it would be a big help with this open source graphics class that I am doing, it would save me time if any one could help.

---

LuaPlayer has jpeg loading. Check out the LuaPlayer source code. Also, there's a jpeg lib in the PSP svn at ps2dev.org, but I don't know what it does, or if it works.

Yes, libjpeg is on the svn at ps2dev.org and as Access_Denied already said, check out the graphics.cpp from the Lua Player source (http://www.luaplayer.org) for the code.

Simple question: What is the function to completely restart an app with a touch of a button? I already know that you use sceKernelExitGame(); to exit, but i want to know how to restart.

Zitat:

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Zitat von superbatxs

Simple question: What is the function to completely restart an app with a touch of a button? I already know that you use sceKernelExitGame(); to exit, but i want to know how to restart.

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i dont think such a function exists. However, you may want to check psppower.h in the sdk.

I'm Making A prx and was wondering how read controler input with the xmb controls still working?


thanks

psp-freak - I had the same problem. turns out you dont need to update the 'pad' enumerator (or is SceCtrlData a structure?). Just:

Code:

---

SceCtrlData pad;

...

for(;;)
  if(pad.Buttons & PSP_CTRL_CROSS) { /* blah */ }

---

That will execute blah as well as enter any menu your currently on in the XMB.

Thank you So much!
this will help a lot

Ok, i have a question with File I/O. How do i open a text file, check what is says, and if it says the number i want it to say, i do a certain action. For example, if it reads 0, then i simply pop up a menu or something. After i choose something from that menu, i want to save a different number if i choose a certain option from that menu. For example, if my text says 0, i go to the menu, i click something, i do that action and i want to save a 1 telling my code that in the future, i do not want that menu to pop up.

Zitat:

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Zitat von superbatxs

Simple question: What is the function to completely restart an app with a touch of a button? I already know that you use sceKernelExitGame(); to exit, but i want to know how to restart.

---

You could use sceKernelLoadExec to reload the eboot.pbp.

psp-freak222: Use sceCtrlPeekBufferPositive instead of sceCtrlReadBufferPositive .

Xylem: fopen the file, fread the data in (you may need to convert the data to the correct data type once read in) then assign it to said variable. To save, fopen then fwrite. Google the terms used for how to use them.

The 1.5 custom firmware POC had some code for reading in a config file, it may help you.

Zitat:

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Zitat von Xylem

Ok, i have a question with File I/O. How do i open a text file, check what is says, and if it says the number i want it to say, i do a certain action. For example, if it reads 0, then i simply pop up a menu or something. After i choose something from that menu, i want to save a different number if i choose a certain option from that menu. For example, if my text says 0, i go to the menu, i click something, i do that action and i want to save a 1 telling my code that in the future, i do not want that menu to pop up.

---

Do you know how to open a file?
well, depends on how you are doing it... or where you are looking.

Code:

---

char x[2];
char variable[2] = "0";
char variable2[2] = "1";
FILE *yourFile;
if ((yourFile = fopen("thisfile.txt","rb")) == NULL)
{
    return -1;
}
x[fread(x, 1, 1/*Number of bytes to read, In this case, 1*/, yourFile)] = 0;
fclose(yourFile);

if(strcmp (variable,x) == 0)
        {
                  printf("Variable read from thisfile.txt = 0");
        }

---

You could use the above to compare strings read in a file... thats what strcmp is.

Zitat:

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Zitat von Moca

Do you know how to open a file?
well, depends on how you are doing it... or where you are looking.

Code:

---

char x[2];
char variable[2] = "0";
char variable2[2] = "1";
FILE *yourFile;
if ((yourFile = fopen("thisfile.txt","rb")) == NULL)
{
    return -1;
}
x[fread(x, 1, 1/*Number of bytes to read, In this case, 1*/, yourFile)] = 0;
fclose(yourFile);

if(strcmp (variable,x) == 0)
        {
                  printf("Variable read from thisfile.txt = 0");
        }

---

You could use the above to compare strings read in a file... thats what strcmp is.

---

So that code is saying that if the variable is 0, then you print something! I get it. Nice! Thanks for telling me about strcmp. ;)

Xylem, try something like this:

fread(buffer,1,2,blah);
int number = atoi(buffer);
if(number == 24) { blah }

atoi converts a string to a number so you can compare it to other numbers. But make sure you include string.h.

Zitat:

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Zitat von Access_Denied

Xylem, try something like this:

fread(buffer,1,2,blah);
int number = atoi(buffer);
if(number == 24) { blah }

atoi converts a string to a number so you can compare it to other numbers. But make sure you include string.h.

---

But the code Moca gave me is quite simple and good as well. I do have an important question though. How do you "dofile" (lua) something in C? Also, is it possible to load lua scripts from C? That would be really cool, but it sounds hard.

Zitat:

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Zitat von Xylem

So that code is saying that if the variable is 0, then you print something! I get it. Nice! Thanks for telling me about strcmp. ;)

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Im guessing you are misunderstanding the code.

Code:

---

char x[2]; // Creating variable called x.  x will contain the string of text that you read from the file

char variable[2] = "0"; // This is just a normal string... In this case, it is 0. So variable = "0"
char variable2[2] = "1"; // I dont know why i put this there ;p
//Standard file IO
FILE *yourFile;
if ((yourFile = fopen("thisfile.txt","rb")) == NULL)
{
          return -1;
}

//Below is where a specified number of bytes is read from the file.  In this case, 1
x[fread(x, 1, 1/*Number of bytes to read, In this case, 1*/, yourFile)] = 0;
fclose(yourFile);

if(strcmp(x,variable) == 0)
{
          printf("Variable read from thisfile.txt = 0");
}

---

btw, heres how strcmp works..

strcmp(string1, string2);
compare the two strings.
if they ARE equal, return 0
if they are NOT equal, dont return 0 ;p

hello,
i am still searching for version check, I found one for "lua" but lua isn't C/C++.
could someone port it to C? because i don't know how:Argh:
Greets Kwastie,
I hope you could help me :Jump: :Jump:

Zitat:

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Zitat von Kwastie

hello,
i am still searching for version check, I found one for "lua" but lua isn't C/C++.
could someone port it to C? because i don't know how:Argh:
Greets Kwastie,
I hope you could help me :Jump: :Jump:

---

I saw the thread a few posts down and im assuming that is what you are talking about.
http://forums.qj.net/f-psp-developme...ua-100256.html


If so, it is quite easy. I actually made a function to do this a while ago.

Actually, it uses strcmp ;p ... If you read the past few posts. It is actually related.

Just open the version.txt

Code:

---

fopen("flash0:/version.txt","rb");

---

Seek to the 77th byte.

Code:

---

fseek(file,77,SEEK_SET);

---

Read 10 bytes. 77 - 87

store that in a string.

Then use strcmp to compare the 10 bytes you just read to a predefined string. For example, "0x03010010" = 3.10

:tup:

What's wrong with this part of my code?

Code:

---

      while (1)
                {
                        clearScreen(ColorBlack);
                        blitAlphaImageToScreen(0,0,16,20,cursor,x,y);
     
      if ((pad.Buttons & PSP_CTRL_UP) && (y > 3)) {
        y = y - 4;
      }
      if ((pad.Buttons & PSP_CTRL_DOWN) && (y < 237)) {
        y = y + 4;
      }
      if((pad.Buttons & PSP_CTRL_RIGHT) && (x < 445)) {
        x = x + 4;
      }
      if((pad.Buttons & PSP_CTRL_LEFT) && (x > 3)) {
        x = x - 4;
      }
     
      sceDisplayWaitVblankStart();
      flipScreen();
  }
  sceKernelSleepThread();
  return 0;
}

---

All variables is declared, this is just a part of the code. My cursor doesen't move!

Zitat:

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Zitat von gameo

What's wrong with this part of my code?

Code:

---

      while (1)
                {
                        clearScreen(ColorBlack);
                        blitAlphaImageToScreen(0,0,16,20,cursor,x,y);
     
      if ((pad.Buttons & PSP_CTRL_UP) && (y > 3)) {
        y = y - 4;
      }
      if ((pad.Buttons & PSP_CTRL_DOWN) && (y < 237)) {
        y = y + 4;
      }
      if((pad.Buttons & PSP_CTRL_RIGHT) && (x < 445)) {
        x = x + 4;
      }
      if((pad.Buttons & PSP_CTRL_LEFT) && (x > 3)) {
        x = x - 4;
      }
     
      sceDisplayWaitVblankStart();
      flipScreen();
  }
  sceKernelSleepThread();
  return 0;
}

---

All variables is declared, this is just a part of the code. My cursor doesen't move!

---

Try using less &&. Did you assign a value to x and y when you declared them... use int x = 0;

btw, that took me a few times to read through that to understand what the boundaries are.

add this and remove those &&'s

if(x < 3){x = 3;}
if(y < 3){y = 3;}
if(x > 445){x = 445;}
if(y > 237){y = 237;}


Dont worry about the ugliness and non indentation ;p

You can fix that.

It will check if x or y has passed its boundaries set and assign it to a value...

With your code, its not enough info just stating you declared it. The value will NEVER increase with the method you used if x/y = 0

Code:

---

int x = 0;
int y = 0;
while (1)
{
        clearScreen(ColorBlack);
        blitAlphaImageToScreen(0,0,16,20,cursor,x,y);
        if(pad.Buttons & PSP_CTRL_UP)
        {
                y = y - 4;
        }
        if(pad.Buttons & PSP_CTRL_DOWN)
        {
                y = y + 4;
        }
        if(pad.Buttons & PSP_CTRL_RIGHT)
        {
                x = x + 4;
        }
        if(pad.Buttons & PSP_CTRL_LEFT)
        {
                x = x - 4;
        }
        if(x < 3){x = 3;}
        if(y < 3){y = 3;}
        if(x > 445){x = 445;}
        if(y > 237){y = 237;}
        sceDisplayWaitVblankStart();
        flipScreen();
  }
  sceKernelSleepThread();
  return 0;
}

---

something like that

Zitat:

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Zitat von Moca

Try using less &&. Did you assign a value to x and y when you declared them... use int x = 0;

---

Zitat:

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Zitat von myself

All variables is declared, this is just a part of the code.

---

Using less &&? Well i learned it this way from Access_Denied's tut's, so i don't really understand the code you just posted.

Zitat:

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Zitat von gameo

Using less &&? Well i learned it this way from Access_Denied's tut's, so i don't really understand the code you just posted.

---

Its not an issue with the && in general. Its the fact that i have to search through the file to find what the boundaries are ;p

ANd you have no method of checking if the value of x or y is already out of the boundary.

Im assuming the boundaries are

3 - 445 for x
and
3 - 237 for y

Is there an alternative method other than cygwin. I installed it correctly before I formatted my hd. Is there an alternative to cygwin. However, I still want to install toolchain.

you could use psptoolchain @ linux, ubuntu.. I use it to :) it works great

Zitat:

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Zitat von Moca

I saw the thread a few posts down and im assuming that is what you are talking about.
http://forums.qj.net/f-psp-developme...ua-100256.html


If so, it is quite easy. I actually made a function to do this a while ago.

Actually, it uses strcmp ;p ... If you read the past few posts. It is actually related.

Just open the version.txt

Code:

---

fopen("flash0:/version.txt","rb");

---

Seek to the 77th byte.

Code:

---

fseek(file,77,SEEK_SET);

---

Read 10 bytes. 77 - 87

store that in a string.

Then use strcmp to compare the 10 bytes you just read to a predefined string. For example, "0x03010010" = 3.10

:tup:

---

well i understand it but I don't know how to read 10 bytes 77-87 and how to store and read it could you give complete code :o

@gameo: Don't you have to do a vshCtrlReadBufferPositive call inside your loop (before all the button checks)? Otherwise it'll just keep reading the old buttons.

Zitat:

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Zitat von Kwastie

you could use psptoolchain @ linux, ubuntu.. I use it to :) it works great


well i understand it but I don't know how to read 10 bytes 77-87 and how to store and read it could you give complete code :o

---

You should really read up on file IO, nevertheless here is an untested version of the code.

FILE *file = fopen("flash0:/version.txt","rb");
char buffer[10];
fseek(file,77,SEEK_SET);
fread(buffer, 10, 1, file);
fclose(file);