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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| problem with pointers |
 Posted: Thu Feb 17, 2011 1:14 pm |
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Hi There,
I think I'm running into some kind of problems with my pointers... 
I defined a | Code: | typedef struct {
int16 value;
char id;
} eevalues; |
and then an array of these values like this:
| Code: | | eevalues store[VARNUM] |
and I pass it to a function as a eevalues *data pointer but in the function i can't access the values anymore :( I only get 0s trying to access it like this:
- how come?  |
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jacqueskleynhans
Joined: 10 Apr 2008
Posts: 109
Location: Cape Town, South Africa
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| Posted: Thu Feb 17, 2011 2:43 pm |
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These forums are valuable resources have a look around and also try searching for your problem elements.
http://www.ccsinfo.com/forum/viewtopic.php?t=44697&highlight=struct
This might not help but it contains some struct examples. Also I found a google search with maybe something like struct and pointer with CCS. usually narrows a search better than using ccs search.
Best of luck
Jacques
_________________
"THE ONLY EASY DAY WAS YESTERDAY" |
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Re: problem with pointers |
| Posted: Thu Feb 17, 2011 2:59 pm |
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| cerr wrote: | Hi There,
I think I'm running into some kind of problems with my pointers...
I defined a | Code: | typedef struct {
int16 value;
char id;
} eevalues; |
and then an array of these values like this:
| Code: | | eevalues store[VARNUM] |
and I pass it to a function as a eevalues *data pointer but in the function i can't access the values anymore :( I only get 0s trying to access it like this:
- how come? |
Did you try data[0].value ??
I do this stuff all the time...
And if you look in the K&R C programming Lanuage , you'll see that your use of '->' is incorrect as -> is used when the pointed structure is a pointer... which you don't have up there.
Check page 128-131 of K&R's "The C Programming Language" for more verbose usage to help you along.
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Re: problem with pointers |
| Posted: Thu Feb 17, 2011 5:03 pm |
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| bkamen wrote: |
And if you look in the K&R C programming Lanuage , you'll see that your use of '->' is incorrect as -> is used when the pointed structure is a pointer... which you don't have up there.
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Exactly right, -> is used to dereference (it's the same as (*XYZ)) and i had a brain fart there and didn't realize that. But why would the code compile at all? I would ixpect it to throw an error like value is not an element of data* or similar... |
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Re: problem with pointers |
| Posted: Thu Feb 17, 2011 5:04 pm |
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| cerr wrote: | | bkamen wrote: |
And if you look in the K&R C programming Lanuage , you'll see that your use of '->' is incorrect as -> is used when the pointed structure is a pointer... which you don't have up there.
|
Exactly right, -> is used to dereference (it's the same as (*XYZ)) and i had a brain fart there and didn't realize that. But why would the code compile at all? I would ixpect it to throw an error like value is not an element of data* or similar... |
(shrug)
Cheers,
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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