C++ TPtrC::Left方法代码示例

void CRichText::OverrideFormatForParsersIfApplicable(TPtrC& aText, TCharFormatX& aFormat, TInt aStartPos) const
	{
	if (aFormat.iParserTag && iParserData->iActiveParserList && iParserData->iEditObserver)
		{
		// Replace format
		TInt start = -1;
		TInt length = 0;
		TInt curPos = iParserData->iLastKnownCursor;
		if (curPos > DocumentLength())
			curPos = DocumentLength();  // This shouldn't be neccesary but it makes it more
										// bulletproof if the calls from outside are made in
										// the wrong order
		if (curPos != -1)
			{
			TCharFormatX format;
			TCharFormatXMask varies;
			MParser* parser;

			GetExtendedCharFormat(format, varies, curPos, 1);
			// If char at curpos has a tag then cursor is over that tag, get extents of tag
			if (CParserList::ReformatOnRollover(format.iParserTag))
				DoCursorOverTag(curPos, parser, start, length);
			else if (curPos)
				{
				GetExtendedCharFormat(format, varies, curPos - 1, 1);
				// Try the char "before" curpos
				if (CParserList::ReformatOnRollover(format.iParserTag))
					DoCursorOverTag(curPos - 1, parser, start, length);
				}
			}

		MParser* parser = iParserData->iActiveParserList->ParserWithThisTag(aFormat.iParserTag);
		
		if (length && (aStartPos >= start) && (aStartPos < start + length))
			{
			if (start + length < aStartPos + aText.Length())
				aText.Set(aText.Left(start + length - aStartPos));
			if (parser != NULL)
				{
				// Only accept the rollover format if the parser agrees 
				// with the framework match of a tag
				if (parser->ConfirmCursorOverTag(*this, start, length, curPos))
					parser->GetRolloverFormat(aFormat.iCharFormat);
				else 
					// Reset format to recognised format if parser disagrees
					// with the framework match as the tag is still in view
					// and must be formatted as in the else clause below.
					parser->GetRecogniseFormat(aFormat.iCharFormat);
				}
			}
		else
			{
			if (length && (start > aStartPos))
				aText.Set(aText.Left(start - aStartPos));
			if (parser != NULL)
				parser->GetRecogniseFormat(aFormat.iCharFormat);
			}
		}
	}

void CAppConfig::GetConfigL(const TDesC &aKey, const TConfig &aConfig) {
    RDbTable table;
    TDbSeekKey seekKey(aKey);
    
    User::LeaveIfError(table.Open(iDb, KConfigTable, table.EReadOnly));

    CleanupClosePushL(table);

    User::LeaveIfError(table.SetIndex(KConfigIndex));
    
    CDbColSet* colSet = table.ColSetL();
    CleanupStack::PushL(colSet);
    
    TInt valueColNo = colSet->ColNo(KConfigValueCol);
    
    if (table.SeekL(seekKey)) {
        table.GetL();
        TPtrC value = table.ColDes(valueColNo);
        
        switch (aConfig.iType) {
            case EConfigBool:
                *aConfig.iValue.iBool = value.Compare(KBoolTrue) == 0 ? ETrue : EFalse;
                break;
                
            case EConfigInt: {
                TLex lex(value);
                TInt lvalue;
                if (lex.Val(lvalue) == KErrNone) {
                    *aConfig.iValue.iInt = lvalue;
                }
                break;
            }
            
            case EConfigText:
                if (aConfig.iValue.iText->MaxLength() > value.Length()) {
                    aConfig.iValue.iText->Copy(value.Left(aConfig.iValue.iText->MaxLength()));
                } else {
                    aConfig.iValue.iText->Copy(value);
                }
                break;
                
            case EConfigText8:
                if (aConfig.iValue.iText8->MaxLength() > value.Length()) {
                    aConfig.iValue.iText8->Copy(value.Left(aConfig.iValue.iText8->MaxLength()));
                } else {
                    aConfig.iValue.iText8->Copy(value);
                }
                break;
        }
    }
    
    CleanupStack::PopAndDestroy(colSet);
    CleanupStack::PopAndDestroy(&table);
}

TPtrC CEikListBoxTextEditor::EditableItemText(TRect* aRect)
	{
	_AKNTRACE_FUNC_ENTER;
    TPtrC itemtext = ItemText();
	if (iItemPos==0)	// not yet set (and even if set, cannot be zero)
		{
		iItemPos = itemtext.Locate('\n');	// loacte partly editable item start
	    if (iItemPos != KErrNotFound)
			{
			iItemPos++;		// jump over mark character
			iItemLen = itemtext.Mid( iItemPos ).Locate('\n');	// locate string end
			if ( iItemLen == KErrNotFound )
				Panic( ETUiklbedPanicEndMarkMissing );
			if ( iItemLen==0 )
				Panic( ETUiklbedPanicEmptyField );
			TPtrC head = itemtext.Left( iItemPos );
			TPtrC body = itemtext.Mid( iItemPos, iItemLen );
			if ( aRect ) // adjust the rect if it is given
				{
				aRect->iTl.iX += iFont->TextWidthInPixels( head );
				aRect->iBr.iX = aRect->iTl.iX + iFont->TextWidthInPixels( body ) + 4;
				}
			_AKNTRACE_FUNC_EXIT;
			return body;
			}
		iItemPos = 0; // partly editable text not found
		}
	_AKNTRACE_FUNC_EXIT;
	return itemtext;
	}

TPtrC TLineBuffer::ReadLine()
	{
	// Class nvariant: iRemainder == iTail.Length()
	ASSERT(iRemainder == iTail.Length());

	TInt end = iTail.Locate('\n');
	if (end < 0)
		{
		// Buffer ends without ending '\n', treat as line
		end = iTail.Length();
		iRemainder = 0;
		}
	else
		{
		// 0 <= end < iTail.Length() => iTail.Length() > iRemainder >= 0
		// (remainder is always decreased at least by 1, skipping '\n',
		// and will never become negative, because end < remainder)
		iRemainder -= end + 1;		
		// Ignore CR before LF, if present
		if (end > 0 && iTail[end-1] == '\r')
			--end;
		}
	const TPtrC line(iTail.Left(end));
	iTail.Set(iTail.Right(iRemainder));
	return line;
	}

EXPORT_C void TInuLogger::WriteComment(const TDesC& aComment)
//
//	Writes aComment to test log file, logging file and test harness
	{
	TPtrC line;
	line.Set(aComment);

	while (line.Length() > KMaxLogLineLength)
		{
		iLogger.Write(line.Left(KMaxLogLineLength));
		line.Set(line.Right(line.Length() - KMaxLogLineLength));
		}
	
	iLogger.Write(line.Left(line.Length()));
	
	}

S60MediaRecognizer::MediaType S60MediaRecognizer::identifyMediaType(const QString& fileName)
{
    S60MediaRecognizer::MediaType result = Video; // default to videoplayer
    bool recognizerOpened = false;

    TInt err = m_recognizer.Connect();
    if (err == KErrNone) {
        recognizerOpened = true;
    }

    err = m_fileServer.Connect();
    if (err == KErrNone) {
        recognizerOpened = true;
    }

    // This is needed for sharing file handles for the recognizer
    err = m_fileServer.ShareProtected();
    if (err == KErrNone) {
        recognizerOpened = true;
    }

    if (recognizerOpened) {
        m_file.Close();
        err = m_file.Open(m_fileServer, QString2TPtrC(QDir::toNativeSeparators(fileName)), EFileRead |
            EFileShareReadersOnly);

        if (err == KErrNone) {
            TDataRecognitionResult recognizerResult;
            err = m_recognizer.RecognizeData(m_file, recognizerResult);
            if (err == KErrNone) {
                const TPtrC mimeType = recognizerResult.iDataType.Des();

                if (mimeType.Left(KMimeTypePrefixLength).Compare(KMimeTypePrefixAudio) == 0) {
                    result = Audio;
                } else if (mimeType.Left(KMimeTypePrefixLength).Compare(KMimeTypePrefixVideo) == 0) {
                    result = Video;
                }
            }
        }
    }
    return result;
}

EXPORT_C TBool CEikListBoxTextEditor::UpdateModelL()
	// virtual - needs to be rewritten if editing other than single column text list
	{
	_AKNTRACE_FUNC_ENTER;
	if (!Editor()) 
	    {
	    _AKNTRACE_FUNC_EXIT;
	    return EFalse;   // quit if editing is not currently on
	    }
	const MDesCArray* matchableTextArray=ListBoxModel()->MatchableTextArray();
	CDesCArray* textArray=(CDesCArray*)matchableTextArray;

    TPtrC itemtext = ItemText();
    if ( iItemPos ) // partly editable item?
        {
        HBufC* itemBuffer= HBufC::New(itemtext.Length());
        CleanupStack::PushL( itemBuffer );
        TPtr itemPointer = itemBuffer->Des();

        itemPointer.Append( itemtext.Left( iItemPos ) );

        HBufC* ptr=iEditor->GetTextInHBufL();
		TPtrC newText;
		if (ptr)
			{
			newText.Set(ptr->Des());
			}
        TInt addSpaces = iItemLen - newText.Length();
        for (TInt index=0; ((addSpaces>0) && (index<addSpaces)); index++)
			itemPointer.Append(_L(" "));

        itemPointer.Append( newText );
        itemPointer.Append( itemtext.Right( itemtext.Length()-iItemPos-iItemLen ) );

        delete ptr;
		textArray->InsertL( ItemIndex(), *itemBuffer );
        CleanupStack::PopAndDestroy(); // itemBuffer

        textArray->Delete( ItemIndex()+1 );
        }
    else // replace the whole list item
        {
		HBufC* newText = iEditor->GetTextInHBufL();
		if (!newText) return ETrue; // if user tries to insert an empty text...

		CleanupStack::PushL(newText);
		textArray->InsertL(ItemIndex(),*newText);
		CleanupStack::PopAndDestroy(); // newText

		textArray->Delete( ItemIndex() + 1 );
		}
    _AKNTRACE_FUNC_EXIT;
	return ETrue;
	}

/**
Function to write a comment string to test log file, logging file and test harness.
@param aComment The descriptor containing the comment string
*/
EXPORT_C void THttpLogger::WriteComment(const TDesC& aComment)
//
//	Writes aComment to test log file, logging file and test harness
	{
	if(iLogger)
		{
		// If connection to flogger was made
		if(iLogger->Handle() != 0)
			{
			TPtrC line;
			line.Set(aComment);

			while (line.Length() > KMaxLogLineLength)
				{
				iLogger->Write(line.Left(KMaxLogLineLength));
				line.Set(line.Right(line.Length() - KMaxLogLineLength));
				}
			
			iLogger->Write(line.Left(line.Length()));
			}
		}
	}

void CScriptFile::FoundNewItemL(const TDesC& aText, TLex& arInput, TInt& arCurrentItemStart, CScriptSection& aSection, CScriptSectionItem*& arCurrentItem)
	{
	TPtrC token = arInput.MarkedToken();

	ParseAndSetItemValueL(aText, arInput, arCurrentItemStart, arCurrentItem);

	arInput.SkipSpaceAndMark();
	arCurrentItemStart = arInput.Offset();

	TPtrC itemEnd(KScriptItemEnd);
	const TInt length = token.Length() - itemEnd.Length();
	arCurrentItem = &aSection.ReplaceItemL(token.Left(length), KNullDesC);
	}

/*
-------------------------------------------------------------------------------

    Class: CStifSectionParser

    Method: SubstractLine

    Description: Substracts line from selected text

    Parameters: TPtrC& aText: in: text.

    Return Values: TPtrC: Substracted line.

    Errors/Exceptions: None

    Status: Proposal

-------------------------------------------------------------------------------
*/
TPtrC CStifSectionParser::SubstractLine( const TPtrC& aText )
	{
	TLex lex( aText );
	
	while( !lex.Eos() )
		{
		if ( lex.Get() == 0x0A ) // "\n" character. Unix style
			{
			break;
			}		
		}
	
	return aText.Left( lex.Offset() );
	}

/**
Copy a maximum of KTextFieldMinimalLength characters from aSrc to aDest.

@param aSrc Source text buffer.
@param aDest Destination text buffer.

@return ETrue if copy was successfull, EFalse otherwise.
*/
TBool TCntPersistenceUtility::CopyMinFieldText(TPtrC aSrc,TDes& aDest)
	{
	TBool ret(EFalse);
	if(aSrc.Length() > 0)
		{
		TInt  length = aSrc.Length();
		if (length>KTextFieldMinimalLength)
			{
			length=KTextFieldMinimalLength;
			}	
		aDest.Copy(aSrc.Left(length));
		ret = ETrue;
		}
	return ret;
	}

// ---------------------------------------------------------
// CWtaiHandler::GetWtaiLibraryFunctionL()
// ---------------------------------------------------------
//
TPtrC CWtaiHandler::GetWtaiLibraryFunctionL()
	{
	CLOG_ENTERFN( "CWtaiHandler::GetWtaiLibraryFunction()" );
    // wtai://<library>/<function> (; <parameter>)*

	TPtrC path = RemoveSchemeFromUrlL( KWtai );

	// <library>/<function> (; <parameter>)*
    TInt colonPos = VerifyWtaiSchemeL( path );

	TPtrC library_function = path.Left( colonPos );

	CLOG_LEAVEFN( "CWtaiHandler::GetWtaiLibraryFunction()" );

	return library_function; // <library>/<function>
	}

TInt CSwisExpressionEnvironment::ExtractNextToken(TPtrC& aTokenString, TPtrC& aParseString)
	{
	TInt separatorPosition = aParseString.LocateF(',');
	
	// Check that a separator was located within the parse string
	if(separatorPosition == KErrNotFound || separatorPosition > aParseString.Length()-1)
		{
		return KErrNotFound;
		}
	
	// Set the extracted token string and remove the token from the parse string
	aTokenString.Set(aParseString.Left(separatorPosition));
	aParseString.Set(aParseString.Mid(separatorPosition+1));
	
	return KErrNone;
	}

LOCAL_C void DistinguishElement(const TPtrC& aElement, RArray<TRange>& aSelectiveCaseRange)
{

	TInt colonOccurance = aElement.FindC(KTEFColon);
	//we are expecting only a range or a test case ID over here...
	if( colonOccurance!=KErrNotFound )
		{
		//then this is a range of testcases, split it at the colon
		TRange newRange(aElement.Left(colonOccurance),aElement.Mid(colonOccurance+1));
		aSelectiveCaseRange.Append(newRange);
		}
	else
		{
		TRange newRange(aElement,aElement);
		aSelectiveCaseRange.Append(newRange);	
		}
}

/**
 * Reads the value present from the test steps ini file within the mentioned section name and key name
 * Copies the value to the TUint reference passed in.
 * If the value is prefixed with 0x the value is read as a hexadecimal value
 * If the value is suffixed with b the value is read as a binary value
 * If the value is prefixed with a 0 the value is read as an octal value
 * If it does not match the above it is read in as an integer
 * @param aSectName - Section within the test steps ini file
 * @param aKeyName - Name of a key within a section
 * @return aResult - The integer value of the Hex input
 * @return TBool - ETrue for found, EFalse for not found 
 */	
TBool CDataWrapperBase::GetUintFromConfig(const TDesC& aSectName, const TDesC& aKeyName, TUint& aResult)
	{
	TPtrC	result;
	TBool	ret=EFalse;
	TRAPD(err, ret=GetCommandStringParameterL(aSectName, aKeyName, result));
	if ( err != KErrNone )
		{
		ret=EFalse;
		}
	if ( ret )
		{
		TLex	lex(result);
		if( result.FindC(KPrefixHex)==KErrNone )
			{
			lex=result.Mid(KPrefixHex().Length());
			ret=(lex.Val(aResult, EHex)==KErrNone);
			}
		else
			{
			TInt	binarySuffixPosition=result.Length()-KSuffixBinary().Length();
			if ( result.FindC(KSuffixBinary)==binarySuffixPosition )
				{
				lex=result.Left(binarySuffixPosition);
				ret=(lex.Val(aResult, EBinary)==KErrNone);
				}
			else
				{
				if( result.FindC(KPrefixOctal)==KErrNone )
					{
					ret=(lex.Val(aResult, EOctal)==KErrNone);
					}
				else
					{
					TInt	intResult;
					ret=(lex.Val(intResult)==KErrNone);
					if ( ret )
						{
						aResult=(TUint)intResult;
						}
					}
				}
			}
		}

	return ret;
	}