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Implementing an Active object • Create a class derived from CActive • Encapsulate the appropriate asynchronous service provider handler or handles (usually R-Classes) as member data of the class • Invoke the constructor of CActive, specifying the appropriate task priorityusually the default priority • Connect to the service provider in your ContructL() method • Invoke CActiveScheduler:Add() in ContructL() (unless there is good reason not to-it must be called somewhere) • Implement NewL() and NewLC() as normal • Inplement your asynchronous request function. Do not forget to call SetActive() • Implement your RunL() method to handle any necessary work once the request is complete • Implement DoCancel() to handle caceling of the request • Optionally override RunError() to handle leaves • Implement the destructor to call Cancel() to close handles
LOCAL_C void doExampleL() { Typical use of Active obj. CActiveScheduler* as = new(ELeave) CActiveScheduler(); CleanupStack::PushL(as); CActiveScheduler::Install(as); CMyKeyboard* kbd = new (ELeave)CMyKeyboard(); // Active object CleanupStack::PushL(kbd); kbd->ConstructL(); kbd->RequestKeyPress(); console->Printf(_L("Starting AS\n")); CActiveScheduler::Start(); // Never return until “CActiveScheduler::Stop()” is called CleanupStack::PopAndDestroy(2); }
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Symbian OS C++ Development Foundati
Page 3 and 4:
Timeline • 120 minutes presentati
Page 5 and 6:
Objective for this session • To u
Page 7 and 8: What is Series 60 about? • Series
Page 9 and 10: • Symbian GUIs: • Eikon (ER5, a
Page 11 and 12: Coding conventions
Page 13 and 14: • Remember reusability • Rememb
Page 15 and 16: General naming conventions • Alwa
Page 17 and 18: Class names • Class names consist
Page 19 and 20: Member data • Use preceding “i
Page 21 and 22: Constants • Use a “K” prefix
Page 23 and 24: Interfaces • Only use of Multiple
Page 25 and 26: Basic data types on Symbian OS
Page 27 and 28: Basic data type: Text • TText - c
Page 29 and 30: Basic data type: Floating-point •
Page 31 and 32: Descriptors • Used in preference
Page 33 and 34: TBuf HBufC
Page 35 and 36: • Used with for string literals
Page 37 and 38: Resource and memory management
Page 39 and 40: Exception handling • All programs
Page 41 and 42: Conventional error-checking methods
Page 43 and 44: Symbian way of handling exceptions
Page 45 and 46: An example of using cleanup stack L
Page 47 and 48: Guidelines of using Cleanup stack
Page 49 and 50: Why is a second constructor needed?
Page 51 and 52: Example of two-phase construction /
Page 53 and 54: Panics in Symbian OS • void User:
Page 55 and 56: Active object
Page 57: • Used to handle one event • De
Page 61 and 62: Typical implementation of Active ob
Page 63 and 64: void CMyKeyboard::DoCancel() { iCon
Page 65 and 66: void CActiveScheduler::DoStart() {
Page 67 and 68: Client-Server architecture
Page 69 and 70: • Using Client-Server architectur
Page 71 and 72: Multiple clients • Server side ha
Page 73 and 74: Some typical Servers in Symbian OS
Page 75 and 76: Series 60 GUI application framework
Page 77 and 78: File System File System Comms & Sys
Page 79 and 80: file system file system Comm & Comm
Page 81 and 82: Application Avkon Uikon CMyAppAppli
Page 83 and 84: View Architectures • Traditional
Page 85 and 86: Eikon Based application Architectur
Page 87 and 88: Dialog Based Application Architectu
Page 89 and 90: View Based Application Architecture
Page 91 and 92: Application Avkon Uikon CMyAppAppli
Page 93 and 94: DLL entrypoint and New Application
Page 95 and 96: TUid CMyAppApp::AppDllUid() const {
Page 97 and 98: Document class cont’d • Creates
Page 99 and 100: App UI class • Short for Applicat
Page 101 and 102: Container class • Creates a windo
Page 103 and 104: Container class cont’d class CMyA
Page 105 and 106: RESOURCE EIK_APP_INFO { menubar=r_m
Page 107 and 108: Resource file, cont RESOURCE TBUF r
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