C++ TDes::Replace方法代码示例

// -----------------------------------------------------------------------------
// CapParser::ReplaceSpecialCharsL( TDes& aText, const TDesC& aValue )
// Replaces special characters to xml compliant.
// -----------------------------------------------------------------------------
//
void CapParser::ReplaceSpecialCharsL( TDes& aText, const TDesC& aValue )
    {
    if ( aValue.Length() > aText.MaxLength() )
        {
        User::Leave(KErrTooBig);
        }
    aText.Copy( aValue );
    
    //Replace special characters
    for( TInt i = 0; i < aText.Length(); i++ )
        {
        switch( aText[i] )
            {
            case KFind1:
                if ( aText.Length()+KReplace1().Length()-1 > aText.MaxLength() )
                    {
                    User::Leave(KErrTooBig);
                    }
                aText.Replace( i, 1, KReplace1 );
                i+=KReplace1().Length()-1;
                break;
            case KFind2:
                if ( aText.Length()+KReplace2().Length()-1 > aText.MaxLength() )
                    {
                    User::Leave(KErrTooBig);
                    }
                aText.Replace( i, 1, KReplace2 );
                i+=KReplace2().Length()-1;
                break;
            case KFind3:
                if ( aText.Length()+KReplace3().Length()-1 > aText.MaxLength() )
                    {
                    User::Leave(KErrTooBig);
                    }
                aText.Replace( i, 1, KReplace3 );
                i+=KReplace3().Length()-1;
                break;
            case KFind4:
                if ( aText.Length()+KReplace4().Length()-1 > aText.MaxLength() )
                    {
                    User::Leave(KErrTooBig);
                    }
                aText.Replace( i, 1, KReplace4 );
                i+=KReplace4().Length()-1;
                break;
            case KFind5:
                if ( aText.Length()+KReplace5().Length()-1 > aText.MaxLength() )
                    {
                    User::Leave(KErrTooBig);
                    }
                aText.Replace( i, 1, KReplace5 );
                i+=KReplace5().Length()-1;
                break;
            default:
                break;
            }
        }
    }

// This function is used to update month and day in aBufLocalTime
// to actual month and day to be passed to TTime() constructor.
// Remember using TTime::FormatL() in thelpers.cpp 
// has added extra month and a day to aBufLocalTime.
// aBufLocalTime is in format YYMMDD:HHMMSS.MMMMMM
// see TTime::Set() for aBufLocalTime expected format details.
TInt UpdateToActualMonthAndDay(TDes& aBufUTCTime)
	{	
	TInt mVal 	= 0;
	TInt dVal 	= 0;
	
	TBuf <4> tempBuf;
	_LIT(KFormat, "%02d");
	
	//Get the position of colon separator	
	TInt colon 	= aBufUTCTime.Locate(':');
		
	// Get Month & Day if Present	
	switch(colon)
		{
		case 0: break;
		case 8:
			{
			TLex month 	= aBufUTCTime.Mid(4,2);
			TLex day 	= aBufUTCTime.Mid(6,2);
			month.Val(mVal);
			day.Val(dVal);			
			}
			break;
		default:
			{
			// If the colon is at the wrong position
			return (KErrArgument);
			}
				
		}
		
		// Deduct extra month and a day and update aBufLocalTime
		if(mVal > 0 && dVal > 0)
			{
			mVal-=1;
			dVal-=1;
				
			tempBuf.Format(KFormat, mVal);
			aBufUTCTime.Replace(4,2, tempBuf);
				
			tempBuf.Format(KFormat, dVal);
			aBufUTCTime.Replace(6,2, tempBuf);				
			}
			
		return(KErrNone);		
	}

	// class CIconFileHandle : public CBase, public MContextBase, 	
void FigureOutRealPathL(const TDesC& aFullPath, TDes& aRealPath, RFs& aFs) 
	{
		CALLSTACKITEMSTATIC_N(_CL("JuikIcons"), _CL("FigureOutRealPathL"));

		if ( aFullPath == AknIconUtils::AvkonIconFileName() )
			{
				aRealPath.Copy( aFullPath );
				return;
			}
#ifdef __S60V3__
		// Change path to c:\\resource 
		TParse p; p.Set( aFullPath, 0, 0);
		aRealPath=_L("c:\\resource\\");
		aRealPath.Append(p.NameAndExt());
#else
		// Just use given path
		aRealPath=aFullPath;
#endif
		
#ifdef __WINS__
		// in WINS, read always from Z 
		aRealPath.Replace(0, 1, _L("z"));
#else
		// In device, if file doesn't exist, read from E
		TBool try_mif=EFalse;
		if (p.Ext().CompareF(_L(".mbm"))==0) try_mif=ETrue;
again:
		if (! BaflUtils::FileExists(aFs, aRealPath)) {
			aRealPath.Replace(0, 1, _L("e"));
			if (! BaflUtils::FileExists(aFs, aRealPath)) {
				if (try_mif) {
					aRealPath=_L("c:\\resource\\");
					aRealPath.Append(p.Name());
					aRealPath.Append(_L(".mif"));
					try_mif=EFalse;
					goto again;
				}
				User::Leave(KErrNotFound);
			}
		}
#endif
	}

//------------------------------------------------------------------------------------------------------------   
void CPerfDbCreator::SetRandomAlphaNumericString(TDes& aBuf,TInt aLength, TBool aWithSeed)
	{
	aBuf.SetLength(aLength);

	for (TInt ii=0;ii<aLength;++ii)
		{
		aBuf[ii]=RandomAlphaNumbericCharCode();
		}
   
   if (aWithSeed)
      aBuf.Replace(0,8, iTextSeed);		
	}