By Iain Campbell
An up to date perception into Communications programming at Symbian, incorporating alterations brought by way of the newest model of Symbian OS (Symbian OS V9), that is the root of the hot telephones presently achieving the marketplace. It courses builders during the Symbian OS communications structure and offers crucial info at the communications types and programming interfaces utilized by Symbian OS. transparent updated factors of ways Symbian OS Communications works, established with complete code examples in every one bankruptcy Written by means of skilled Symbian engineer who leads the Symbian Communications Programming crew Covers designated issues to incorporate Bluetooth, HTTP, Serial Communications, OBEX and messaging
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Extra resources for Symbian OS Communications Programming
Example text
These APIs are covered further in Chapter 8. 3 ETel ETel provides the lowest level interface to the telephony functionality within Symbian OS. Below ETel is the realm of the device-specific adaptation, which converts ETel API calls into whatever form is necessary for the specific baseband stack that is in use – this is the job of the TSY (Telephony SYstem module). Because ETel provides a very low-level API, Symbian implement a wrapper over this called ‘ETel 3rd party’, which provides a limited subset of the functionality available in the ETel API in an easy-to-use form.
A discussion of this API and the functionality available is in Chapter 7. 4 Serial Server The serial server provides, perhaps unsurprisingly, the interface to serial ports, both real and virtual. 4), provide access to specific technologies – RS-232 physical serial ports (rarely found on phones today), and Bluetooth, infrared and USB virtual serial ports. Some products contain additional, product-specific CSYs for communicating with other parts of the system, such as the cellular modem, but these are rarely useful to developers.
Otherwise, in all these calls the length of the descriptor is always set to the length of the data returned. In the case of using read continuations with a datagram or sequenced packet protocol, it indicates the number of bytes remaining in the current datagram, to allow an appropriately-sized buffer to be passed in on the next read to pick up the remaining part of the packet. Read() provides a simplified interface to Recv() when you don’t need to pass flags. An ongoing Recv() and Read() can be cancelled using CancelRecv() or CancelRead() respectively.
