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how to save a game

Discuss issues related to the fx-9860G Software Development Kit
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how to save a game

Postby Canta » Thu Jun 07, 2012 4:31 pm

Hi.
I would like to save a game (for now it is enough to store one number).
Unfortunately I have no idea how I can do that.
Can anyone help me please?

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Postby SimonLothar » Thu Jun 07, 2012 4:39 pm

Canta wrote:I would like to save a game (for now it is enough to store one number).

For small amounts of data the main memory would be best.
Look for the SDK's Bfile-functions.
Bfile_CreateMainMemory
Bfile_OpenMainMemory
Bfile_ReadFile
Bfile_WriteFile
Bfile_CloseFile
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Postby Canta » Thu Jun 07, 2012 6:01 pm

Thanks for the reply.
Does this code creates a file which is named "Save" and opens it or did I something wrong? :
Code: Select all
#include "fxlib.h"
#include "filebios.h"

int AddIn_main(int isAppli, unsigned short OptionNum)
{
const unsigned char name[]={"Save"};
Bfile_CreateMainMemory(name);
Bfile_OpenMainMemory(name);

return 1;
}



I don't understand " Bfile_ReadFile, Bfile_WriteFile, Bfile_CloseFile ". (With Handle and readpos etc.)

Can you please give me an example?

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Postby SimonLothar » Fri Jun 08, 2012 5:04 am

Code: Select all
unsigned int key;
  int handle, success;
  int itemtosave = 0x12345678;
// try to open the file 
  handle = Bfile_OpenMainMemory( "SAVE" );
  if ( handle < 0 ){
// if the open fails, create it
     success = Bfile_CreateMainMemory( "SAVE" );
// if the create succeeded, open the file again
     if ( success == 0 ) handle = Bfile_OpenMainMemory( "SAVE" );
  }
  if ( handle >= 0 ){
// if the handle is OK, you can use the handle with Bfile_WriteFile and Bfile_ReadFile
// f. i. save
    success = Bfile_WriteFile( handle, &itemtosave, sizeof( itemtosave ) );
   
// finally you must close the file
    success = Bfile_CloseFile( handle );
   
// re-open the file
    handle = Bfile_OpenMainMemory( "SAVE" );
    if ( handle >= 0 ){
// reset itemtosave to prove, that Bfile_ReadFile did something
      itemtosave = 0;
      success = Bfile_ReadFile( handle, &itemtosave, sizeof( itemtosave ), 0 );
// check the readprocess     
      if ( itemtosave == 0x12345678 ){
        locate( 1, 1 );
        Print( "success" );
        GetKey( &key );
      }
   
// finally the file must be closed again
      success = Bfile_CloseFile( handle );
    }
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Postby aapman55 » Fri Jun 08, 2012 10:07 am

if itemtosave is an array. is the filesize then the amount of fields in your array?

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Postby SimonLothar » Fri Jun 08, 2012 10:40 am

aapman55 wrote:if itemtosave is an array. is the filesize then the amount of fields in your array?

Only if the array is a one-byte-per-item array (f. i. char x[20]). Generally the filesize will be the amount of bytes (or chars) in the array.
If you have an array int x[20], the filesize will be 80, because every int occupies 4 bytes.
The function sizeof() comes in handy there. It returns the amount of bytes, which a variable occupies.

BTW: the main memory assigns at least 24 bytes to a file, so if you save one int (= 4 chars), the filsize in the main memory will be reported as 24.
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Postby Canta » Fri Jun 08, 2012 12:44 pm

Thanks for the code. I tried to use it but I can't build it.
Code: Select all
#include "fxlib.h"
#include "keybios.h"

int AddIn_main(int isAppli, unsigned short OptionNum)
{
unsigned int key;
  int handle, success;
  int itemtosave = 0x12345678;
// try to open the file 
  handle = Bfile_OpenMainMemory( "SAVE" );
  if ( handle < 0 ){
// if the open fails, create it
     success = Bfile_CreateMainMemory( "SAVE" );
// if the create succeeded, open the file again
     if ( success == 0 ) handle = Bfile_OpenMainMemory( "SAVE" );
  }
  if ( handle >= 0 ){
// if the handle is OK, you can use the handle with Bfile_WriteFile and Bfile_ReadFile
// f. i. save
    success = Bfile_WriteFile( handle, &itemtosave, sizeof( itemtosave ) );
   
// finally you must close the file
    success = Bfile_CloseFile( handle );
   
// re-open the file
    handle = Bfile_OpenMainMemory( "SAVE" );
    if ( handle >= 0 ){
// reset itemtosave to prove, that Bfile_ReadFile did something
      itemtosave = 0;
      success = Bfile_ReadFile( handle, &itemtosave, sizeof( itemtosave ), 0 );
// check the readprocess     
      if ( itemtosave == 0x12345678 ){
        locate( 1, 1 );
        Print( "success" );
        GetKey( &key );
      }
   
// finally the file must be closed again
      success = Bfile_CloseFile( handle );
    }

    return 1;
}
#pragma section _BR_Size
unsigned long BR_Size;
#pragma section
#pragma section _TOP

int InitializeSystem(int isAppli, unsigned short OptionNum)
{
    return INIT_ADDIN_APPLICATION(isAppli, OptionNum);
}
#pragma section

Code: Select all
save.c(10) : C1016 (W) Argument mismatch
save.c(13) : C1016 (W) Argument mismatch
save.c(15) : C1016 (W) Argument mismatch
save.c(26) : C1016 (W) Argument mismatch
save.c(34) : C1016 (W) Argument mismatch
save.c(44) : C2709 (E) Illegal section name declaration
save.c(45) : C2500 (E) Illegal token "unsigned"
save.c(45) : C2225 (E) Undeclared name "BR_Size"
save.c(46) : C2709 (E) Illegal section name declaration
save.c(47) : C2709 (E) Illegal section name declaration
save.c(49) : C2500 (E) Illegal token "int"
save.c(49) : C2500 (E) Illegal token "int"
save.c(50) : C2500 (E) Illegal token "{"
save.c(53) : C2709 (E) Illegal section name declaration
save.c(53) : C2500 (E) Illegal token ""

sorry for my little knowledge:rolleyes:

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Postby PierrotLL » Fri Jun 08, 2012 12:53 pm

A curly brackets is missing.

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Postby Canta » Fri Jun 08, 2012 1:00 pm

Thanks. Now it works.

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Postby aapman55 » Fri Jun 08, 2012 8:44 pm

thanks! i made a little test program for it and it works great. Below is the code, in case some one needs an example with arrays and stuff.
it basically is a counter, counting by pressing EXE and quiting the program by EXIT

Code: Select all
#include "fxlib.h"
#define SCA 0xD201D002
#define SCB 0x422B0009
#define SCE 0x80010070
typedef int(*sc_iv)(void);
typedef void(*sc_viuc)( int, unsigned char* );
typedef void(*sc_vpuc)(unsigned char*);

// itoa
const unsigned int sc0541[] = { SCA, SCB, SCE, 0x0541 };
#define itoa (*(sc_viuc)sc0541)

int AddIn_main(int isAppli, unsigned short OptionNum)
{
unsigned char viewnumber[15];
int lcont;   
unsigned int key;
  int handle, success;
  int itemtosave[3];
lcont=1;
  handle = Bfile_OpenMainMemory( "SAVE" );
  if ( handle < 0 ){
   itemtosave[0]=0;
   itemtosave[1]=10;
   itemtosave[2]=100;
     Bfile_CreateMainMemory( "SAVE" );
     handle = Bfile_OpenMainMemory( "SAVE" );
   Bfile_WriteFile( handle, &itemtosave, sizeof( itemtosave ) );
   Bfile_CloseFile( handle );
  }

  if ( handle >= 0 ){
       Bfile_ReadFile( handle, &itemtosave, sizeof( itemtosave ), 0 );
   Bfile_CloseFile( handle );
}

while(lcont){
itoa( itemtosave[0], viewnumber );
locate(1,1);
Print(viewnumber);
itoa( itemtosave[1], viewnumber );
locate(1,3);
Print(viewnumber);
itoa( itemtosave[2], viewnumber );
locate(1,5);
Print(viewnumber);
    GetKey(&key);
switch(key){
   case KEY_CTRL_EXE:
      itemtosave[0]++;
      itemtosave[1]++;
      itemtosave[2]++;
      break;
   case KEY_CTRL_EXIT:
      lcont=0;
      break;
      }
}

  handle = Bfile_OpenMainMemory( "SAVE" );
Bfile_WriteFile( handle, &itemtosave, sizeof( itemtosave ) );
Bfile_CloseFile( handle );
     return 1;
}

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