hbufc2.cpp

symbian 小程序

// HBufC2.cpp
//
// Copyright (c) 2005 Neusoft Institute of Information Technology.Chengdu  
// All rights reserved.

// written by hewei
//  
// version 1.0
// Date: 2005-10-12

// 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 CHBufC : public CBase
	{
public:
	static CHBufC* NewL(const TDesC& aDes,CConsoleBase* aCOnsole);
	static CHBufC* NewLC(const TDesC& aDes,CConsoleBase* aConsole);

public :
	TInt Length();  //Length;
	TInt Compare(const TDesC& aDes);    //compare two Descriptors
    TInt FindOut(const TDesC& aDes);    //find substring
	TInt LocateChar(TChar aChar);       //lacate char in descriptor
	TInt HBufCMatch(const TDesC& aDes); //Match two desriptors
	TPtrC16 MidHbufc(TInt aPos);        //Mid
	TPtrC16 LeftHbufc(TInt aLength);    // Left
	TPtrC16	RightHbufc(TInt aLength);   // Right
    TInt HBufCSize();                   // Desvriptor size
	void  otherOperation();             //other operation
    HBufC*  HBufCAppend(const TDesC& aDes);  //Append
	~CHBufC();
private:
	CHBufC(CConsoleBase* aConsole);
	void ConstructL(const TDesC& aDesC);
private :
	HBufC* iBuf;
	TInt iLength;
	CConsoleBase* iConsole;
};


//////////////////////////////////////////////////////////////////////////////
//
// -----> CHBufC (implementation)
//
//////////////////////////////////////////////////////////////////////////////
CHBufC* CHBufC::NewL(const TDesC& aDes,CConsoleBase* aConsole) 
	{
	CHBufC* Hbufc=new (ELeave)CHBufC(aConsole);
	Hbufc->ConstructL(aDes);
	return Hbufc;
	
}

CHBufC* CHBufC::NewLC(const TDesC& aDes,CConsoleBase* aConsole) 
	{
	CHBufC* Hbufc=CHBufC::NewL(aDes,aConsole);
	CleanupStack::PushL(Hbufc);
	return Hbufc;
}

CHBufC::CHBufC(CConsoleBase* aConsole)
{
	iConsole=aConsole;
	iLength=0;
}

void CHBufC::ConstructL(const TDesC& aDes)
{
	iBuf=HBufC::NewLC(aDes.Length()+20);
	TPtr16 ptr16=iBuf->Des();
	ptr16.Copy(aDes);
	CleanupStack::Pop();
}

TInt CHBufC::Length()
{
	iLength=iBuf->Length();
	return iLength;
}

TInt CHBufC::Compare(const TDesC& aDes)
{
  return iBuf->Compare(aDes);	
}

TInt CHBufC::FindOut(const TDesC& aDes)
{
	return iBuf->Find(aDes);
}

TInt CHBufC::LocateChar(TChar aChar)
{
	return iBuf->Locate(aChar);
}

TInt CHBufC::HBufCMatch(const TDesC& aDes)
{
	return iBuf->Match(aDes);
}

TPtrC16 CHBufC::MidHbufc(TInt aPos)
{
	return iBuf->Mid(aPos);
}

TPtrC16 CHBufC::LeftHbufc(TInt aLength)
{
	return iBuf->Left(aLength);
}

TPtrC16 CHBufC::RightHbufc(TInt aLength)
{
	return iBuf->Right(aLength);
}

TInt CHBufC::HBufCSize()
{
	return iBuf->Size();
}

void CHBufC::otherOperation()
{
	_LIT(KFORMAT1,"address of HBufC is %x\n");
    _LIT(KFORMAT2,"address of data in HBufC is %x\n");
	iConsole->Printf(KFORMAT1,iBuf);
	iConsole->Printf(KFORMAT2,iBuf->Ptr());
}
HBufC* CHBufC::HBufCAppend(const TDesC& aDes)
{

	TPtr16 ptr16(iBuf->Des());
    ptr16.Append(aDes);
	return iBuf;
}

CHBufC::~CHBufC()
{
	delete iBuf;
}
//////////////////////////////////////////////////////////////////////////////
//
// 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;
    }


//////////////////////////////////////////////////////////////////////////////
//
//doExample() and CallExample()
//
//////////////////////////////////////////////////////////////////////////////
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(KSTRING,"hewei");
	_LIT(KSTRING2,"heping");
	_LIT(KSubString,"we");
	
	_LIT(KLENGTH,"length of HBufC is %d\n");
    _LIT(KSIZE,"size of HBufC is %d\n");
	
	_LIT(KINFO1,"bufc is grater than string2.\n");
	_LIT(KINFO2,"bufc is equal to string2.\n");
	_LIT(KINFO3,"bufc is grater than string2.\n");
	_LIT(KFIND,"find!.pos is %d\n");
	_LIT(KMATCH,"position of first match is %d\n");
	_LIT(KNEWBUF,"New buf is %s\n");

	_LIT(KFORMAT,"%s\n");
	
	CHBufC* bufc=CHBufC::NewLC(KSTRING,console);
	//print length and size of descriptor;
	console->Printf(KLENGTH,bufc->Length());
	console->Printf(KSIZE,bufc->HBufCSize());
    
	//compare two descriptors;
	if(bufc->Compare(KSTRING2)>0)
		console->Printf(KINFO1);
	else if(bufc->Compare(KSTRING2)==0)
        	console->Printf(KINFO2);
	else
			console->Printf(KINFO3);
    
	//match two descriptors
	console->Printf(KMATCH,bufc->HBufCMatch(KSTRING2));
		
	// find
    console->Printf(KFIND,bufc->FindOut(KSubString));
    
	console->Getch();
	
	//left、right、Mid
	console->Printf(KFORMAT,bufc->LeftHbufc(1).Ptr());
    console->Printf(KFORMAT,bufc->MidHbufc(2).Ptr());
    console->Printf(KFORMAT,bufc->RightHbufc(2).Ptr());
    
	//Locate a char
	TChar ch('e');
	console->Printf(KFIND,bufc->LocateChar(ch));
    
	//other operation
	bufc->otherOperation();
    
	//Append
    console->Printf(KNEWBUF,bufc->HBufCAppend(KSTRING2)->Ptr());
	
	CleanupStack::PopAndDestroy();

}