helloview.cpp

symbian中讲述的一个有关bookengine的简单例子

/*
* ============================================================================
*  Name     : CHelloView from CAknView
*  Part of  : Hello
*  Copyright (c) 2003 Nokia. All rights reserved.
* ============================================================================
*/

// INCLUDE FILES
#include <aknviewappui.h>
#include <avkon.hrh>

#include <MyHello.rsg>

#include "MyHello.hrh"
#include "HelloView.h"
#include "HelloContainer.h" 
#include "MyHelloAppUi.h"

#include "WorldView.h"
#include <myhello.mbg>	//for mbm
#include <akncontext.h>	//for CAknContextPane
#include <akntitle.h>	//for CAknTitlePane
#include "MyHelloAppUi.h"	//for CMyHelloAppUi
#include "SingleListView.h"	//KViewId3

#include <aknnotewrappers.h> 
#include <f32file.h>	//for RFs
#include <s32file.h>	//for RFileReadStream, RFileWriteStream

// ================= MEMBER FUNCTIONS =======================

// C++ default constructor can NOT contain any code, that
// might leave.
//
CHelloView* CHelloView::NewL()
{
    CHelloView* self = NewLC();
    CleanupStack::Pop(self);
    return self;
}

CHelloView* CHelloView::NewLC()
{
    CHelloView* self = new (ELeave) CHelloView;
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
}

CHelloView::CHelloView()
{
}

// EPOC default constructor can leave.
void CHelloView::ConstructL()
{
    BaseConstructL(R_HELLO_VIEW);
}

// Destructor
CHelloView::~CHelloView()
{
	
}

// ---------------------------------------------------------
// TUid CHelloView::Id()
// Returns Id of the view.
// ---------------------------------------------------------
TUid CHelloView::Id() const
{
    return KViewId1;
}


// ---------------------------------------------------------
// CHelloView::HandleCommandL(TInt aCommand)
// Handles commands
// ---------------------------------------------------------
void CHelloView::HandleCommandL(TInt aCommand)
{   
	switch(aCommand)
	{
	case EMyHelloCmdLogon:
		{
			AppUi()->ActivateLocalViewL(KViewId3);

			//AppUi()->ActivateLocalViewL(KViewId2);
// 			TBuf<256> strName;
// 			iContainer->GetLoginName(strName);
// 
// 			CAknInformationNote* information = new(ELeave) CAknInformationNote;
// 			information->ExecuteLD(strName);
			
			//WriteFileToTxtL();
			//ReadFileFromTxtL();

// 			WriteFileToStreamL();
// 			ReadFileFromStreamL();
			break;
		}
		
	default:
		{
			AppUi()->HandleCommandL(aCommand);
			break;
		}
	}
}
// ---------------------------------------------------------
// CHelloView::HandleClientRectChange()
// Handles client rect change.
// ---------------------------------------------------------
void CHelloView::HandleClientRectChange()
{
    if (iContainer)
	{
        iContainer->SetRect(ClientRect());
	}
}

// ---------------------------------------------------------
// CHelloView::DoActivateL(...)
// Creates the Container class object.
// ---------------------------------------------------------
void CHelloView::DoActivateL(const TVwsViewId& /*aPrevViewId*/,
							 TUid /*aCustomMessageId*/,
							 const TDesC8& /*aCustomMessage*/)
{
    iContainer = new (ELeave) CHelloContainer;
    iContainer->SetMopParent(this);
	
	TRect rc;
	rc.SetRect(ClientRect().iTl, TSize(176, 144));
    iContainer->ConstructL(rc);
    AppUi()->AddToStackL(*this, iContainer);

	TBuf<KMaxPath> pathMbm;
#ifdef __WINS__
	pathMbm.Copy(_L("z:\\system\\apps\\myhello\\myhello.mbm"));
#else
	CMyHelloAppUi* pApp = (CMyHelloAppUi*)CEikonEnv::Static()->AppUi();
	pApp->GetAppPath(pathMbm);
	pathMbm.Append(_L("myhello.mbm"));
#endif
	
	CEikStatusPane* statusPane = StatusPane();
	
	//set icon
	CAknContextPane* contextPane = (CAknContextPane*) statusPane->ControlL(TUid::Uid(EEikStatusPaneUidContext));
	CFbsBitmap* bitmap = iEikonEnv->CreateBitmapL(pathMbm, EMbmMyhelloSnoopy_1_icon);
	CFbsBitmap* bitmapMask = iEikonEnv->CreateBitmapL(pathMbm, EMbmMyhelloSnoopy_1_mask);
	
	//contextPane->SetPicture(bitmap);
	contextPane->SetPicture(bitmap, bitmapMask);


	//set title
// 	CAknTitlePane* titlePane = (CAknTitlePane*) statusPane->ControlL(TUid::Uid(EEikStatusPaneUidTitle));
// 	titlePane->SetTextL(_L("Hello view!"));
	
	//load chinese words
	TBuf<32> sTmpTitle;
	CEikonEnv::Static()->ReadResource(sTmpTitle, R_QTN_MH_HELLO_TITLE);
	
	CAknTitlePane* titlePane = (CAknTitlePane*) statusPane->ControlL(TUid::Uid(EEikStatusPaneUidTitle));
	titlePane->SetTextL(sTmpTitle);

	//show
// 	CAknInformationNote* informationNote = new (ELeave) CAknInformationNote;
// 	informationNote->ExecuteLD(sTmpTitle);
}

// ---------------------------------------------------------
// CHelloView::DoDeactivate()
// Deletes the Container class object.
// ---------------------------------------------------------
void CHelloView::DoDeactivate()
{
    if (iContainer)
	{
        AppUi()->RemoveFromStack(iContainer);
		MEM_FREE(iContainer);
	}
}

// ---------------------------------------------------------
// CHelloView::ReadFileByTxt()
// Read file.
// ---------------------------------------------------------

//读取普通文本文件内容

void CHelloView::ReadFileFromTxtL()
{
	RFs& fs = CEikonEnv::Static()->FsSession();
	RFile file;
	
	TBuf<32> sFileName;
#ifdef __WINS__
	sFileName.Copy(_L("c:\\test.txt"));//C:\Symbian\7.0s\Series60_v21_C\Epoc32\wins\c
#else
	sFileName.Copy(_L("e:\\test.txt"));
#endif
	TInt err = file.Open(fs, sFileName, EFileRead);
	if (err != KErrNone) 
	{
		return;
	}
	//获取文件当前长度
	TInt nFileLen = 0;
	file.Size(nFileLen);

	//判断文件是否为空
	if(nFileLen <= 0)
	{
		file.Close();
		return;
	}
	
	//准备内存空间存放文件内容
	HBufC8* pStr8Buf = HBufC8::NewL(nFileLen);
	
	//读取文件内容
	file.Read(pStr8Buf->Des());
	
	//转换
	HBufC* pStrBuf = HBufC::NewL(nFileLen);
	pStrBuf->Des().Copy(pStr8Buf->Des());
	delete pStr8Buf;
	
	//显示读取的文件内容
    CAknInformationNote* informationNote = new (ELeave) CAknInformationNote;
    informationNote->ExecuteLD(pStrBuf->Des());	
	
	delete pStrBuf;

	//关闭文件
	file.Close();	
}

//写普通文本文件

void CHelloView::WriteFileToTxtL()
{
	//获取会话
	RFs& fs = CEikonEnv::Static()->FsSession();
	//创建会话
	//User::LeaveIfError(fs.Connect());
	
	RFile file;
	TBuf<32> sFileName;
	
	//设置文件路径和文件名
#ifdef __WINS__
	sFileName.Copy(_L("c:\\test.txt"));
#else
	sFileName.Copy(_L("e:\\test.txt"));
#endif

	//以写文件的方式打开文件
	TInt err = file.Open(fs, sFileName, EFileWrite);

	//若文件打开失败则返回
	if (err != KErrNone)
	{
		return;
	}
	//文件打开成功，则执行写文件的操作

	//文件指针定位
	//TInt pos = 0;
	//file.Seek(ESeekEnd, pos);
	
	//从Edit获取用户输入的数据，用于写入到文件中
	TBuf<18> strName; //strName.Size();
	iContainer->GetLoginName(strName);
	
	//将用户输入的数据进行转换：16位转换成8位
    TPtrC8 representation( (TUint8*)strName.Ptr(), strName.Size() );
    
	//写入文件
	file.Write( representation );
	
	//清理文件缓冲
    file.Flush();
    
	strName.SetLength( 0 );
	
	//	file.Write(_L8("data of file !"));
	
// 	_LIT(message,"write ok !");
// 	CAknInformationNote* informationNote = new (ELeave) CAknInformationNote;
// 	informationNote->ExecuteLD(message);
	
	//关闭文件
	file.Close();
}

//读取流文件内容
void CHelloView::ReadFileFromStreamL()
{
	//创建会话
	RFs iFession;
	User::LeaveIfError(iFession.Connect());

	RFileReadStream readStream;

	//以读取流文件的方式打开流文件
	if( KErrNone != readStream.Open(iFession, _L("C:\\testStream.str"), EFileRead))
	{
		//若文件打开失败，则先关闭会话再返回
		iFession.Close();
		return;
	}
	
	//打开流文件成功

	//压栈
	readStream.PushL();
	
	//读取流长度
	TInt nLen = 0;
	nLen = readStream.ReadInt32L();

	//判断流内容长度
	if(nLen > 0)
	{
		//若流数据内容长度大于零，则申请空间
		HBufC*	pStr = HBufC::NewL(nLen);

		//读取流数据内容：内化
		readStream >> pStr->Des();
		//readStream.ReadL();

		//显示读取到的内容
		CAknInformationNote* informationNote = new (ELeave) CAknInformationNote;
		informationNote->ExecuteLD(pStr->Des());
		
		//清理空间
		delete pStr;
	}
	
	//弹栈
	readStream.Pop();
	//释放
	readStream.Release();	
	//关闭会话
	iFession.Close();
}

//写数据到流文件

void CHelloView::WriteFileToStreamL()
{
	//创建会话
	RFs iFession;
	User::LeaveIfError(iFession.Connect());
	
	//删除文件
	iFession.Delete(_L("testStream.str"));
	
	//以写的方式创建流文件
	RFileWriteStream writeStream;
	User::LeaveIfError(writeStream.Create(iFession, _L("C:\\testStream.str"), EFileWrite));
	
	//压栈
	writeStream.PushL();
	
	//从EDIT获取用户输入的数据
	HBufC*	pStr = HBufC::NewL(128);	//pStr->Des().Copy(_L("Data stream of file !"));
	TBuf<16> strName;
	iContainer->GetLoginName(strName);

	//将用户输入的数据存放到pStr中
	TPtr pTprStr(pStr->Des());
	pTprStr.Copy(strName);

	//写数据长度到流文件
	writeStream.WriteInt32L(pStr->Length());

	//写数据到流文件：外化
	writeStream << pStr->Des();
	//writeStream.WriteL();
	
	//清除/释放空间
	delete pStr;
	
	//提交
	writeStream.CommitL();
	//弹栈
	writeStream.Pop();
	//释放资源
	writeStream.Release();
	//关闭会话
	iFession.Close();
	
// 	_LIT(message,"write ok !");
// 	CAknInformationNote* informationNote = new (ELeave) CAknInformationNote;
// 	informationNote->ExecuteLD(message);
}

// End of File