symbian活动对象实战

活动对象对于symbian编程初学者来说，是个难点，这里给出偶的实战代码。

 

步骤：

（1）在carbide C++ 2.0 中新建一个s60 控制台程序test_active_object

（2）修改里面的.h .cpp文件内容为：

 

/* ============================================================================ Name : test_active_object.h Author : Copyright : Your copyright notice Description : Exe header file ============================================================================ */ #ifndef __TEST_ACTIVE_OBJECT_H__ #define __TEST_ACTIVE_OBJECT_H__ // Include Files #include <e32base.h> // Function Prototypes GLDEF_C TInt E32Main(); class CMyActiveObject : public CActive { public: enum TRequestType {ECount, EStop} ; public: CMyActiveObject( TRequestType aRequest = ECount, TInt aPriority = EPriorityStandard ); void DoCancel(); void RunL(); void RequestFunction( TRequestType aRequest ); void ReadyToGo(); void SetIncrementCounter( TInt aCount = 1 ); TUint CountValue () const; ~CMyActiveObject(); private: TUint iCount; TUint iIncrementCount; TRequestType iRequest; } ; #endif // __TEST_ACTIVE_OBJECT_H__  

 

/* ============================================================================ Name : test_active_object.cpp Author : Copyright : Your copyright notice Description : Exe source file ============================================================================ */ // Include Files #include "test_active_object.h" #include <e32base.h> #include <e32std.h> #include <e32cons.h> // Console // Constants _LIT(KTextConsoleTitle, "Console"); _LIT(KTextFailed, " failed, leave code = %d"); _LIT(KTextPressAnyKey, " [press any key]/n"); // Global Variables LOCAL_D CConsoleBase* console; // write all messages to this // ----------------------------------------------------------------------------- // CMyActiveObject::CMyActiveObject // Description: CMyActiveObject constructer // ----------------------------------------------------------------------------- // CMyActiveObject::CMyActiveObject( TRequestType aRequest, TInt aPriority ) : CActive( aPriority ), iCount( 0 ), iIncrementCount( 1 ), iRequest( aRequest ) { CActiveScheduler::Add( this ); } // //----------------------------------------------------------------------------- // CMyActiveObject:: CMyActiveObject // Description: CMyActiveObject Destructer // ----------------------------------------------------------------------------- // CMyActiveObject::~CMyActiveObject() { Cancel(); } // //----------------------------------------------------------------------------- // CMyActiveObject::RequestFunction // Description: Request Function for CMyActiveObject // ---------------------------------------------------------------------------- // void CMyActiveObject::RequestFunction( TRequestType aRequest ) { iRequest = aRequest; iStatus = KRequestPending; if( !IsActive() ) SetActive(); } // //----------------------------------------------------------------------------- // CMyActiveObject::ReadyToGo // Description: This calls CMyActiveObject's RunL //----------------------------------------------------------------------------- // void CMyActiveObject::ReadyToGo() { TRequestStatus* status = &iStatus; User::RequestComplete( status, KErrNone ); } // //----------------------------------------------------------------------------- // CMyActiveObject::DoCancel // Description: This calls CActive's Cancel //----------------------------------------------------------------------------- // void CMyActiveObject::DoCancel() { } // //----------------------------------------------------------------------------- // CMyActiveObject::SetIncrementCounter // Description: Sets Increment Counter of CMyActiveObject //----------------------------------------------------------------------------- // void CMyActiveObject::SetIncrementCounter( TInt aCount) { iIncrementCount = aCount; } // //----------------------------------------------------------------------------- // CMyActiveObject::RunL // Description: CActive::RunL implementation which will either stop the // Scheduler or increment the count //----------------------------------------------------------------------------- // void CMyActiveObject::RunL() { switch(iRequest) { case ECount: { iCount += iIncrementCount; TBuf<20> buf_print; _LIT(KFmt_print, "count is %d /n."); buf_print.Format(KFmt_print, iCount); console->Write(buf_print); } break; case EStop: { CActiveScheduler::Stop(); console->Write(_L("stop./n")); } break; default: break; } } // //----------------------------------------------------------------------------- // CMyActiveObject::CountValue // Description: Returns Count Value of CMyActiveObject //----------------------------------------------------------------------------- // TUint CMyActiveObject::CountValue () const { return iCount; } // Local Functions LOCAL_C void MainL() { // // add your program code here, example code below // console->Write(_L("Hello, world!/n")); } LOCAL_C void DoStartL() { // Create active scheduler (to run active objects) CActiveScheduler* scheduler = new (ELeave) CActiveScheduler(); CleanupStack::PushL(scheduler); CActiveScheduler::Install(scheduler); MainL(); CMyActiveObject* object1 = new( ELeave ) CMyActiveObject; object1->SetIncrementCounter( 5); object1->RequestFunction( CMyActiveObject::ECount ); CleanupStack::PushL( object1 ); CMyActiveObject* object2 = new( ELeave ) CMyActiveObject; object2->RequestFunction( CMyActiveObject::EStop ); //Issue the Request object1->ReadyToGo(); object2->ReadyToGo(); CActiveScheduler::Start(); /* //Create one Active Object for Count purpose CMyActiveObject* CMyActiveObject* object1 = new( ELeave ) CMyActiveObject; object1->SetIncrementCounter( 5); object1->RequestFunction( CMyActiveObject::ECount ); CleanupStack::PushL( object1 ); object1->ReadyToGo(); //object1->SetActive(); CleanupStack::PopAndDestroy( object1 ); */ // Delete active scheduler CleanupStack::PopAndDestroy( object1 ); delete object2; CleanupStack::PopAndDestroy(scheduler); } // Global Functions GLDEF_C TInt E32Main() { // Create cleanup stack __UHEAP_MARK; CTrapCleanup* cleanup = CTrapCleanup::New(); // Create output console TRAPD(createError, console = Console::NewL(KTextConsoleTitle, TSize( KConsFullScreen, KConsFullScreen))); if (createError) return createError; // Run application code inside TRAP harness, wait keypress when terminated TRAPD(mainError, DoStartL()); if (mainError) console->Printf(KTextFailed, mainError); console->Printf(KTextPressAnyKey); console->Getch(); delete console; delete cleanup; __UHEAP_MARKEND; return KErrNone; }  

（3） 编译运行成功