Linking dll in S60 3rd edition - experts please help!

[iulian_moldovan]

Hello!

I develop a 3rd edition application that uses a dll for various sound operations. How may I deploy my application on a 3rd edition device in such a way that the dll is accepted and used?

The single way I found was to install also the dll with a sis file and then install my application with another sis file in order to accept the dll (also found a easier way for this, an embedded sis).

In the old 2nd edition it was enough that the dll existed in the same path as the app or in system\libs, without any other setting. It is not working anymore on 3rd edition? If yes, what requirements the application / the dll must comply for this?

Thanks in advance !

[iulian_moldovan]

Nobody uses dlls ?

[Paul.Todd]

You remembered to add the capabilities and have the dll signed?

[iulian_moldovan]

Yes, the same capabilities as my application and the same way of signing.

It works only with embedded sis installation. If I just copy the dll near the exe it doesn't work.

[msmyslov]

Please check the S60 example apps in S60 3rd' SDK. There are examples involving DLLs. Searching through .mmp files, for instance, SIP example and BrowserControl.

Platform Security has an important implication for DLLs to have at least the same (or exceeding) set of Capabilities as the target host executable. That's why it is not quite possible anymore to arbitrary create "lightweight" DLL modules for a process: a DLL should be "aware by design" about minimal set of PlatSec capabilities that the target .exe has. This also described in documentation.

[John.Holloway]

There is also the issue of the DLL almost certainly having to reside in the \sys\bin folder - as thats the only place the OS will load code from - according to docs - which you cant get access to without AllFiles capability....

Despite it being a desirable design requirement weve now abandoned using Polymorphic Dll's as used on previous OS versions - not least of which its not clear how to search for the set of DLL's - by UID or name without AllFiles capability - which requires manufacturer support....

I believe using the ECom interfaces might provide a mechanism but life was too short....

[gregman]

According to 'S60_Platform_Symbian_Platform_Security_FAQ_v2_0_en[1].pdf',
it is possible to search for dll's in the \sys\bin folder via TFindLibrary. This apparently gets around the problem of having to have the AllFiles permission.
(I havn't tried it yet myself though.)

[Paul.Todd]

It does might imply all DLL's on the system, it actually only enumerates loaded dll's