hbufc.cpp

《基于symbian os 的手机开发与应用》 源代码 何伟 著

// HBufC.cpp
//
// Copyright (c) 2005 Neusoft Institute of Information Technology.Chengdu  
// All rights reserved.

// written by hewei
//  
// version 1.0

// This program demostrate how to use HBufC. 

// NOTE: the structure of this example is different to standard E32 examples


#include <e32cons.h>

  // All messages written to this
LOCAL_D CConsoleBase* console;

// Function prototypes
 void callExampleL();
 void doExampleL();


//////////////////////////////////////////////////////////////////////////////
//
// -----> CStudent (definition)
//
// The class is used by the example code
//
//////////////////////////////////////////////////////////////////////////////
class CStudent : public CBase
	{
public:
	static CStudent* NewL(const TDesC& aName,TInt aNo,TReal aScore);
	static CStudent* NewLC(const TDesC& aName,TInt aNo,TReal aScore);
public :
	HBufC* GetName();
	TInt GetNo();
	TReal GetScore();
	~CStudent();
private:
	CStudent(TInt aNo,TReal aScore);
	void ConstructL(const TDesC& aName);
private :
	TInt iNo;
	HBufC* iName;
	TReal iScore;
	};


//////////////////////////////////////////////////////////////////////////////
//
// -----> CStudent (implementation)
//
//////////////////////////////////////////////////////////////////////////////
CStudent* CStudent::NewL(const TDesC& aName,TInt aNo,TReal aScore) 
	{
	CStudent* stu=new (ELeave)CStudent(aNo,aScore);
	stu->ConstructL(aName);
	return stu;
	
}

CStudent* CStudent::NewLC(const TDesC& aName,TInt aNo,TReal aScore) 
	{
	CStudent* stu=CStudent::NewL(aName,aNo,aScore);
	CleanupStack::PushL(stu);
	return stu;
}
CStudent::CStudent(TInt aNo,TReal aScore)
{
	iNo=aNo;
	iScore=aScore;
}
void CStudent::ConstructL(const TDesC& aName)
{
	iName=HBufC::NewLC(aName.Length());
	TPtr16 ptr16=iName->Des();
	ptr16.Copy(aName);
	CleanupStack::Pop();
	
}
HBufC* CStudent::GetName()
{
	return iName;
}
TInt CStudent::GetNo()
{
	return iNo;
}
TReal CStudent::GetScore()
{
	return iScore;
}
CStudent::~CStudent()
{
	delete iName;
}
//////////////////////////////////////////////////////////////////////////////
//
// Main function called by E32
//
//////////////////////////////////////////////////////////////////////////////
GLDEF_C TInt E32Main()
    {
	  // Get cleanup stack
	CTrapCleanup* cleanup=CTrapCleanup::New();

	 // Some more initialization, then do the example
    TRAPD(error,doExampleL());
	
	  
	  // callExampleL() should never leave.
	_LIT(KMsgPanicEpoc32ex,"EPOC32EX");
	__ASSERT_ALWAYS(!error,User::Panic(KMsgPanicEpoc32ex,error));

  // destroy the cleanup stack
	delete cleanup;
	
	  // return
	return 0;
    }


//////////////////////////////////////////////////////////////////////////////
//
//
//
//////////////////////////////////////////////////////////////////////////////
void doExampleL()
{
  	_LIT(KPressAnyKey,"[Press any key...OK]");
	//Get Console;
	_LIT(KMsgExampleCode,"Symbian OS Example Code");
	console = Console::NewL(KMsgExampleCode,TSize(KConsFullScreen,KConsFullScreen));
		// Put console onto the cleanup stack.
	CleanupStack::PushL(console);

	int error;
	TRAP(error,callExampleL());
	//TRAPD(error,callExampleL());
    if(error)
	{
		_LIT(KERROR,"error occured!\n");
		console->Printf(KERROR);
	
	}
	else{
      _LIT(KNOLEAVE,"No Leave!\n");
		console->Printf(KNOLEAVE);
	}
	console->Printf(KPressAnyKey);
	console->Getch();
		// Remove the console object from the cleanupstack
	  // and destroy it. 	
	CleanupStack::PopAndDestroy();
}

void callExampleL() 
    {
	_LIT(KName1,"hewei");
	_LIT(KNewLine,"\n");
	_LIT(KFmt1,"No=%d  ");
	_LIT(KFmt2,"Score=%f ");
	_LIT(KFmt3,"Name=");
	CStudent* stu=CStudent::NewLC(KName1,1,89.8);
	console->Printf(KFmt3);
	console->Printf(*(stu->GetName()));
	console->Printf(KNewLine);
	console->Printf(KFmt1,stu->GetNo());
	console->Printf(KNewLine);
	console->Printf(KFmt2,stu->GetScore());
	console->Printf(KNewLine);
	CleanupStack::PopAndDestroy();

}