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// UID of the crypto resolver const TUid KCustomResolverUid = {0x10008EE6}; TAny* cryptoInterface = REComSession::CreateImplementationL(KCCryptoInterfaceUid, _FOFF(CCryptoInterface,iDtor_ID_Key), NULL, resolverParams, KCustomResolverUid)); return (reinterpret_cast<CCryptoInterface*>(cryptoInterface)); }
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The third UID of an ECOM plug-in DLL is used to name its associated compiled resource, which contains its ECOM registration information
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So how does a client use an ECOM plug-in As I have already described, the caller doesn t need to be aware of the details and simply uses the factory function supplied by the interface, supplying a cue if it is required ECOM takes care of the details of locating and instantiating the appropriate implementation An interface client must simply include the header les which de ne the interface, link against ECOMlib and use the factory instantiation functions as appropriate:
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#include "CryptoInterfaceh" void GetDefaultCryptoL() {// Get the default implementation of CCryptoInterface CCryptoInterface* crypto = CCryptoInterface::NewL(); CleanupStack::PushL(crypto); CleanupStack::PopAndDestroy(crypto); } void GetSpecifiedCryptoL() {// Use a cue - gets CCryptoInterface implementation which uses // hardware support _LIT8(KHardware,"HW"); CCryptoInterface* crypto = CCryptoInterface::NewL(KHardware); CleanupStack::PushL(crypto); CleanupStack::PopAndDestroy(crypto); } void GetAllCryptoL() { // Get all implementations using CCryptoInterface::ListImplementationsL() RImplInfoPtrArray infoArray;
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CCryptoInterface::ListImplementationsL(infoArray); // infoArray is not leave-safe, but use of the cleanup stack is // omitted for clarity See 3 for more information CCryptoInterface* crypto; for (TInt i =0; i< infoArrayCount(); i++) { // Retrieves default_data for each TPtrC8 dataType = infoArray[i]->DataType(); crypto = CCryptoInterface::NewL(dataType); // Use this as a cue CleanupStack::PushL(crypto); CleanupStack::PopAndDestroy(crypto); } }
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This chapter covered the important concepts behind the ECOM architecture, which provides services to locate, resolve, instantiate and manage instances of polymorphic plug-in DLLs The chapter discussed how to de ne an abstract interface and how to implement it in an ECOM plug-in DLL The example showed how to implement two concrete implementation classes for a ctional cryptographic interface, within a single polymorphic plug-in DLL For this reason, an ECOM plug-in DLL is also known as an ECOM Interface Implementation Collection , and assigned a targettype of ECOMIIC The chapter also described how an interface client can use factory methods provided by the interface to instantiate concrete instances thereof, without having any knowledge of ECOM itself The factory instantiation functions, provided by the interface, call the ECOM framework using REComSession::CreateImplementationL() The ECOM framework uses a default or customized resolver to examine the registry of interface implementations and instantiate an object of the appropriate class An interface client should simply include the header les which de ne the interface and link against ECOMlib 13 discusses generic polymorphic plug-in DLLs and Symbian OS DLL loading in more detail
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Panics
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We experience moments absolutely free from worry These brief respites are called panic Cullen Hightower
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One dictionary de nition of panic is a sudden overpowering fright; sudden unreasoning terror often accompanied by mass ight The word panic itself derives from Pan, the Greek god of nature and goatherds, who was half man and half goat He was considered by some to represent an image of the devil Panic was said to resemble the mental or emotional state induced by him On Symbian OS, when a thread is panicked, the code in it stops running Panics are used to highlight a programming error in the most noticeable way, stopping the thread to ensure that the code is xed, rather than potentially causing serious problems by continuing to run There is no recovery from a panic Unlike a leave, a panic can t be trapped A panic is terminal If a panic occurs in the main thread of a process, the entire process in which the thread runs will terminate If a panic occurs in a secondary thread, it is only that thread which closes However, on hardware, if any thread is deemed to be a system thread, ie essential for the system to run, a panic in the thread will reboot the phone1 Otherwise, if it s not a system thread, on target hardware and in release builds on the Windows emulator, the end result of a panic is seen as a Program closed message box, which displays the process name, along with a panic category and error code In debug emulator builds, you can choose to break into the code to debug the cause of the panic this is known as just-in-time debugging
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1 Forcing a reboot if a system-critical thread panics is a policy decision rather than a shortcoming of the operating system
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