Edgar T. López wrote:
I have several databases, their names are formed by the date and the
time of creation. For example: 19/5/05 4.44 pm, 6/5/05 4.24 pm.
I already checked the DmGetNextDatabase function, but it said:
"Because databases are scattered freely throughout memory space,
they are not returned in any particular order—any database
matching the specified type/creator criteria can be returned.".
That is right. The Palm doesn't keep them in a sorted order, and
you can't make the Palm do it.
Thus,Do I need to create a function to sort my databases?,
This depends on what you are trying to accomplish. If you want
to process them in order by date, you will need to sort them
yourself. If you need to just display a list of them, you could
put their names into an array and sort that.
If yes,
Does anybody have any idea to do this?.
If I needed to create a list of databases sorted by name (or in
some other order), I would use a procedure like this:
(1) Count the number of databases that I care about. Either
iterate through all databases with something like this:
UInt16 count = 0;
for (UInt16 index = 0; index < DmNumDatabases(); index++)
{
LocalID localid = DmGetDatabase (0, index);
if (DatabaseIsImportantToMe(localid))
{
count++;
}
}
Or, if you only want a certain type or creator, you can
use DmGetNextDatabaseByTypeCreator() to count them instead.
(2) Use MemPtrNew() and create an array of LocalID values
of the appropriate size, based on the count.
(3) Fill in LocalID values into the array with another loop
similar to that in step #1.
(4) Use SysQSort() to sort the LocalID array, passing a pointer
to my own compare function. The compare function would use
the LocalID and DmDatabaseInfo() to get the information about
the database (such as name, modification date, whatever)
that you want to sort by.
(5) Process everything in the LocalID array, then free the
array.
Hope that helps.
- Logan
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