c programming

[Squall333]

when programming for the psp can you do like

char a;

a="a";

pgPrint4(1,4,0xffff,a);

[Agoln]

a="a";

^^ is wrong. It should be:

a='a';

Single quotes for characters, double quotes for strings... which are just character array's.

As far as the other code, I don't know.

[Squall333]

thanks for your help but for some reason when i run that code my psp turns off and when i use pspe the program closes

[Agoln]

put it in a loop, or ask for input after it. Make sure that you have to do something before you exit, otherwise it will just exit after excuting and you will not see anything.

[Squall333]

Its in a while(1) loop but i looked at the parameters for pgPrint and i think the last thing has to be a string and cant be a variable

EDIT: i just decided to add my code its pretty short

Code: Select all

// Hello World for PSP


#include "pg.h"


#define CTRL_SQUARE     0x8000 
#define CTRL_TRIANGLE   0x1000 
#define CTRL_CIRCLE     0x2000 
#define CTRL_CROSS      0x4000 
#define CTRL_UP         0x0010 
#define CTRL_DOWN       0x0040 
#define CTRL_LEFT       0x0080 
#define CTRL_RIGHT      0x0020 
#define CTRL_START      0x0008 
#define CTRL_SELECT     0x0001 
#define CTRL_LTRIGGER   0x0100 
#define CTRL_RTRIGGER   0x0200
int n,x,y;
char a;



typedef struct _ctrl_data 
{ 
	int frame; 
	int buttons; 
	unsigned char analog[4]; 
	int unused; 
} ctrl_data_t; 

void keyboardControl()
{
	ctrl_data_t ctrl;
	sceCtrlReadBufferPositive(&ctrl, 1); 
	if (ctrl.buttons & CTRL_UP) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_DOWN) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_LEFT) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_RIGHT) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_SQUARE) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_CIRCLE) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_TRIANGLE) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_CROSS) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_RTRIGGER) { 
		n = n+1;
	} else if (ctrl.buttons & CTRL_LTRIGGER) { 
		n = n+1;
	}
}

int xmain(void)
{

	unsigned long fc;
	unsigned long r,g,b,rgb;
	
	pgInit();
	pgScreenFrame(2,0);
	while (1) {
    keyboardControl();
    
       a='a' ;

	pgFillvram(0);
	pgPrint4(1,4,0xffff,a);
	pgScreenFlipV();
}
	
	return 0;
}

[Agoln]

try making it a character pointer.

like:

char[2] a="a"; //yes, double quotes for strings, which is what this is.

pgprint(/*some x value*/,
/*some y value*/,
/*some color*/,
a);

[Squall333]

the compiler doesnt like the code like that so i tried
char a[2];
strcopy ( a, "a" );

but theres come kind of error

it says parse error before string constant

[Agoln]

char[2] a;

not char a[2];

edit:
If you want, you can try

char* a = "a";

...now that I think of it... i think that's the real way instead of how I said before....

[Squall333]

when i do it that way it says parse error before '[' token
parse error before string constant

[Squall333]

thank you, you are a god the second version worked the char* a="a";

[Shine]

Its in a while(1) loop but i looked at the parameters for pgPrint and i think the last thing has to be a string and cant be a variable

yes, you are right. Please read some C learning book or website, then try to program on PC and then on Playstation. For your problem: if you want just one char, then call pgPutChar (or whatever it is called in Nem's lib). If the function expects a char*, don't pass a char.

[Squall333]

actually i was wrong you can use chars in pgprint but my next question is can you use arrays like

char* a[3] = {"a","b","c"};

pgPrint4(1,4,0xfff,a[3]);

EDIT: Yes you can

[D0gg]

char[2] a;

not char a[2];

that is incorrect. you should use char a[2] or char* a. array brackets go after the variable name.

actually i was wrong you can use chars in pgprint but my next question is can you use arrays like

char* a[3] = {"a","b","c"};

ya, you could do that but doesn't it look like it'll get annoying? that's an array of pointers to "a\0", "b\0" and "c\0" (\0 is the NULL termination of a string). i recommend doing as you did before with a char array (char a[3] = "abc";)

Code: Select all

void pgPrint4(unsigned long x,unsigned long y,unsigned long color,const char *str)

the prototype for pgPrint4 requires a char array or pointer to the beginning of a NULL terminated string.

if had a 1.5 PSP to code on, i'd be able to test what you have there and possibly fix it but sadly i don't so i can't be much help on what will actually happen

[Squall333]

You can use pspe as an emulator if you want. you can get it from www.dcemu.co.uk and then go to the psp news section then on the left under psp emulator

i have 2 more problems my program works in pspe but not on my psp. any ideas?

and two when i press a button and hold it down it makes code like x=x+1 going so isntead of making 1 increase to 2 it makes 1 go to like 3 or 4 because i cant press a key fast enough to make count as one press anyone understand what im saying?

[Squall333]

Sorry for posting so much pgWaitVn(7); works pretty well in between key spaces.