On 6/29/08, John Matthews <[EMAIL PROTECTED]> wrote:
> --- In [email protected], "John Matthews" <[EMAIL PROTECTED]> wrote:
> >
> > --- In [email protected], "Rick Bowers" <Mowgli53@> wrote:
> > >
> > > I am trying to sort an array of pointers to a structure.
> >
> > Hi Rick- below is an example program
>
> Sorry, minor correction:
>
> > static int compareEntryPtr(const void *a, const void *b)
> > {
> > ENTRY *const *pE1 = a;
> > ENTRY *const *pE2 = b;
> >
> > return compareEntry(*pE1, *pE2);
>
> Last line should be:
>
> return cmpEntries(*pE1, *pE2);
>
> Also, note that 'real' code should check that malloc() doesn't return
> NULL, and in general you should free any malloc()ed memory.
Thanks, John.
I tried compiling your code and got the same basic errors I was getting when
I tried this;
D:\Work\sorting.cpp In function `int compareEntry(const void*, const
void*)':
39 D:\Work\sorting.cpp invalid conversion from `const void*' to `const
ENTRY*'
39 D:\Work\sorting.cpp initializing argument 1 of `int cmpEntries(const
ENTRY*, const ENTRY*)'
39 D:\Work\sorting.cpp invalid conversion from `const void*' to `const
ENTRY*'
39 D:\Work\sorting.cpp initializing argument 2 of `int cmpEntries(const
ENTRY*, const ENTRY*)'
46 D:\RWBowers\Work\sorting.cpp invalid conversion from `const void*' to
`ENTRY* const*'
47 D:\RWBowers\Work\sorting.cpp invalid conversion from `const void*' to
`ENTRY* const*'
LINE 39 is here:
static int compareEntry(const void *a, const void *b)
{
* return cmpEntries(a, b);*
}
LINES 46/47 are here:
static int compareEntryPtr(const void *a, const void *b)
{
* ENTRY *const *pE1 = a;
ENTRY *const *pE2 = b;*
return cmpEntries(*pE1, *pE2);
Also,
your approach is to make two calls. I was hoping to do everything in a
single function.
Here is what I tried. Both attempts to point to a structure value (e1 and
e1) fail with "conversion" errors.
int comparefilters (const void *a, const void *b)
{
int value;
struct ENTRY **e1 = a;
// 41 D:\comparefilters.cpp invalid conversion from `const void*' to
`ENTRY**'
struct ENTRY *e2 = (struct ENTRY *)*b;
// 42 D:\comparefilters.cpp `const void*' is not a pointer-to-object type
struct ENTRY *b1 = (struct ENTRY *)e1;
struct ENTRY *b2 = (struct ENTRY *)e2;
char *c1 = b1->ruleKeyword;
char *c2 = b2->ruleKeyword;
return strcmp((char *)c1, (char *)c2);
}
~Rick
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