On Tue, Feb 12, 2002 at 10:49:48PM +0800, Low Pui Kuen wrote:
> Hi everyone,
>
> I have a problem of reading out the members of the STUDENT structure.
> All the members are char pointers. When I try to read out the member (Name),
> I got memory access error.
> Can anyone tell me what have I missed out? Or what is the way to access the
> members(seems like ptr->Name doesn't work; the Name is char pointer) Thanks
> in advance.
>
>
> typedef struct Student
> {
>
> Char *StudentID;
> Char *Name;
> Char *Sex;
> Char *Age;
> Char *Email;
> Char *Phone_HP;
> Char *Phone_H;
>
> }STUDENT;
The problem is not in the way you retrieve the fields, but in the way you store
them. You are storing pointers, and this is clearly wrong: you have to store the
strings and not their addresses.
You can either use array of characters in the Student structure (arrays are not
pointers, remember ? :-), and store those, or you can pack your data structure in
a single string, by separating fields with a separator character. The latter
solutions saves space but it is more complex to implement.
Cheers,
Marco
--
========================================================================
Marco Pantaleoni [EMAIL PROTECTED]
Padova, Italy [EMAIL PROTECTED]
elastiC language developer http://www.elasticworld.org
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