Thread: this code COMPILES, but DOESNT WORK

the problem is that in the set of if-statements (not the one in the function), the second two situations never are true. the code in them is never executed. but, i know that i am actually checking for the right things because if i put an exit(0) in the one that checks for page1, it exits. if i put exit(0) in the others, it never exits. in the beginning i set active_page to page 1 with: active_page = page1;

now, will that make things actually go to page1, not active_page when i blit like this:

masked_blit(ship, active_page, 0,0, x, y,640,480);

???? (because thats what i want to happen)

get what i mean? i want things to always blit to either page1 2 or 3, not actually onto active_page. active_page is used for telling what page to blit to.

Code:

BITMAP *ship, *page1, *page2, *page3, *active_page, *title;

flip_page(&wPage, &page1, &page2, &page3, &active_page);

if(active_page == page1) //this statement WORKS OK
		{
			clean_bitmap(page3);
		}
		if(active_page == page2) //statement never becomes TRUE
		{
		    clean_bitmap(page1);
		}
		if(active_page == page3)
		{
			clean_bitmap(page2);
		}

void flip_page(int *wPage, BITMAP** page1, BITMAP** page2, BITMAP** page3, BITMAP** active_page)
{
	if(*active_page == *page1)
	{
        active_page = page2;
		*wPage       = 2;
	}
    if(*active_page == *page2)
	{
        active_page = page3;
		*wPage       = 3;
	}
	if(*active_page == *page3)
	{
		active_page = page1;
		*wPage       = 1;
	}

}
END_OF_FUNCTION(flip_page);

now that i think of it, active_page might not really be POINTING to the pages. it BECOMES the pages. therefore, we always blit onto active_page....or something like that. I DONT KNOW IM SO CONFUSED

.....reading my reply to my own post....i came up with this: and i think i am CLOSER to achieving what i want, it still does not work though.

Code:

void flip_page(int *wPage, BITMAP** page1, BITMAP** page2, BITMAP** page3, BITMAP*** active_page)
{
	if(*active_page == &(*page1))
	{
        *active_page = &*page2;
		*wPage       = 2;
	}
    if(*active_page == &(*page2))
	{
        *active_page = &*page3;
		*wPage       = 3;
	}
	if(*active_page == &(*page3))
	{
		*active_page = &*page1;
		*wPage       = 1;
	}

}
END_OF_FUNCTION(flip_page);

flip_page(&wPage, &page1, &page2, &page3, &active_page);

BITMAP *ship, *page1, *page2, *page3, **active_page, *title;

if(active_page == &page1) //always true
		{                        
			clean_bitmap(page3); 
		}
		if(active_page == &page2) //never true
		{
		    clean_bitmap(page1);
		}
		if(active_page == &page3)
		{
			clean_bitmap(page2);
		}

wPage is NOT THE PROBLEM!!!!! DONT WORRY ABOUT wPage at all!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! and look at THIS:

BITMAP *ship, *page1, *page2, *page3, **active_page, *title;

that is how its been declared my reply!

also, i want active_page to POINT to the other pages. i dont want it to have the same "value" of the other pages! so active_page is a pointer to a pointer!

now, with all taht said, here is the code which has NO SYNTAX ERRORS:

Code:

BITMAP *ship, *page1, *page2, *page3, **active_page, *title; 

active_page    = &page1;

flip_page(&wPage, &page1, &page2, &page3, &active_page);

if(active_page == &page1) //always true
		{                        
			clean_bitmap(page3); 
		}
		if(active_page == &page2) //never true
		{
		    clean_bitmap(page1);
		}
		if(active_page == &page3)
		{
			clean_bitmap(page2);
		}

void flip_page(int *wPage, BITMAP** page1, BITMAP** page2, BITMAP** page3, BITMAP*** active_page)
{
	if(*active_page == &(*page1))
	{
        *active_page = &*page2;
		*wPage       = 2;
	}
    if(*active_page == &(*page2))
	{
        *active_page = &*page3;
		*wPage       = 3;
	}
	if(*active_page == &(*page3))
	{
		*active_page = &*page1;
		*wPage       = 1;
	}

}
END_OF_FUNCTION(flip_page);

ok, i have a copy of it like that, but with that example, and i blit things onto active_page, will they actually go onto page1, 2, or 3?
thats whati want it to do

still nothing happens on the screen...

take a look at my main program, it does not work now, but i think the pages are actually "flipping" at least: