Symbian面试 答案 .doc

What version of Symbian do you use in the development? What SDK do you use in your development? Symbian 8.0 SDK 2.0 (symbian 7 8, 2nd) Symbian 9.2 SDK 3.0 (symbian 9, 3rd) What is the difference between S60 2nd version and 3rd version? 3.0 2.0 程序 exe app 图标 失量图(svg)， bmp 安全(capability) 每个程序都必须授予一定权限，才能访问特定的API 2.0 entry point function GLDEF_C TInt E32Dll(TDllReason) { return KErrNone; } What IDE do you use to develop Symbian application? Vc6, Codewarrior, Carbide, .net Describe the Symbian code convention. Date member: use prefix i-, should be private; Arguments: prefix a-; Variables start with lower case, Function start with capitals; Setter function: SetThing(aThing); Getter function: myThing = Thing();(return it) GetThing(myThing);(pass it by reference) Variables includeing arguments: for uses-a and * for has-a Trailing L,C for function that cause exception Trailing D functions that delete object Describe the difference between T-, C-, and R- class. T Class: No destructor No explicit assigment No copy constructor operator, a bitwise copy is sufficient for these. C Class Derive from CBase CBase has a virtual destructor Must be allocated on the heap A private copy constructor and assignment operator. This is a common strategy used to prevent a client from making accidental shallow copies of, or assignments to, objects of a class(if use, must be overload constructor or assignments) Pass by pointer of reference ,not by value Overloads operator “new” to zero-initialize object when it is first allocated on the heap. Zero initialization will not occur for stack objects because allocation the stack does not use operator new. T类TDesc、TPoint..T类没有析构函数。它们的行为类似于内置类型。这是为什么所有内置类型的typedef都以T开头的原因。T类可以作为自动变量而分配、作为其他类的成员而分配，或位于堆上C类CActive、CBase..从CBase派生的所有类。C类总是分配在默认堆上。分配对象时，CBase的operator new()将所有成员数据初始化为零。CBase也包括虚析构函数，因此通过对CBase*指针调用delete，正确析构它指向的任何对象R类RFile、RTimer..拥有资源而不是位于默认堆上的所有类。通常分配为成员变量或自动变量；在少数情况，可分配在堆上。大部分R类使用Close()来释放