Find a particular variable position in RArray

[nital_shah]

hi...

class TDemo
{
   TInt Id;
   TBuf<20> Name;
}

normally v use Find like this:

TDemo tdemo = {2,_L("xyz")};
RArray<TDemo> array;
TInt pos = array.Find(tdemo);

but i want to only find the position of Id...
i mean i wanna only pass 1 variable out of 2 for searching the position..
is it possible?
how to code it?

Thanks..
Nital

[nital_shah]

actually i wanna do something like...

pass 1 variable, find its position & retrieve the rest of the variables from that position.

[wizard_hu_]

Actually that is what already happens:

Finds the first object in the array which matches the specified object using a sequential search.

Matching is based on the comparison of a TInt value at the key offset position within the objects.

My guess is that you have not specified an explicit key offset, thus

inline RArray();
Description
Default C++ constructor.

This constructs an array object for an array of type class T objects with default granularity and key offset value. The default granularity is 8 and the defaul key offset value is zero.

And your "TInt Id" is on the 0th offset.

[nital_shah]

Thanks for replying...

can u plz guide how to code dat in my example?
i mean how to specify the key offset?

[wizard_hu_]

can u plz guide how to code dat in my example?

Your example already does that. Although you have to pass a complete TDemo object to Find, the content of "Name" (should be iName) is ignored, so in your code Find is searching for Id=2 only (should be iId).

i mean how to specify the key offset?

Read the documentation of RArray, and check its various constructors. But for your current use case the default behaviour is already fine.

[nital_shah]

Originally Posted by SDK Help
inline RArray();
Description
Default C++ constructor.

This constructs an array object for an array of type class T objects with default granularity and key offset value. The default granularity is 8 and the defaul key offset value is zero.

i got it dat in my example TInt iID is at 0th offset so it is defaultly found..

but wat if i wanna search on basis of TBuf which is on 1st offset..?

if i put it in constructor like RArray<Txxx> array(8,1), it doesnt allow me to append values & panics..

i just wanna use this to find the position..
so hw to do dat?

[wizard_hu_]

You can get the panic code in the usual way. But reading the documentation also helps

inline RArray(TInt aGranularity, TInt aKeyOffset);
Description
C++ constructor with granularity and key offset.

This constructs an array object for an array of type class T objects with a specified granularity and a specified key offset value.

Parameters
TInt aGranularity The granularity of the array.

TInt aKeyOffset The key offset.



Panic codes

Unfortunately I have removed the table from here, but you can find it in the SDK Help.