C++ TBuf16::MaxLength方法代码示例

void CAknEcsNote::SetEmergencyNumber( const TDesC& aMatchedNumber )
    {
    TRect screen(iAvkonAppUi->ApplicationRect());
    TAknLayoutRect mainPane;
    mainPane.LayoutRect(screen, AKN_LAYOUT_WINDOW_main_pane(screen, 0, 1, 1));
    TAknLayoutRect popupNoteWindow;
    AknLayoutUtils::TAknCbaLocation cbaLocation( AknLayoutUtils::CbaLocation() );
	TInt variety( 0 );
    if ( cbaLocation == AknLayoutUtils::EAknCbaLocationRight )
		{
		variety = 5;
		}
	else if ( cbaLocation == AknLayoutUtils::EAknCbaLocationLeft )
		{
		variety = 8;
		}
	else
		{
		variety = 2;
		}

    popupNoteWindow.LayoutRect(mainPane.Rect(), AknLayoutScalable_Avkon::popup_note_window( variety ));
    TAknLayoutText textRect;
    textRect.LayoutText(popupNoteWindow.Rect(), AKN_LAYOUT_TEXT_Note_pop_up_window_texts_Line_1(4));

    // Size of a temporary buffer that contains new lines, spaces and 
    // emergency number for a note.
    TBuf16<KAknEcsMaxMatchingLength+80> number;
    number.Append('\n');
    number.Append('\n');

    TInt spaceCharWidthInPixels = textRect.Font()->CharWidthInPixels(' ');
    if (spaceCharWidthInPixels < 1)
        {
        // Avoid divide by zero situation even the space char would have zero length.
        spaceCharWidthInPixels = 1;
        }
    
    TInt length = (textRect.TextRect().Width() - textRect.Font()->TextWidthInPixels(aMatchedNumber))
                    / spaceCharWidthInPixels;

    const TInt matchedNumberLength = aMatchedNumber.Length();
    const TInt numberLength = number.Length();
    const TInt numberMaxLength = number.MaxLength();
    
    if ( numberLength + length + matchedNumberLength > numberMaxLength)
        {
        // To make sure that buffer overflow does not happen.
        length = numberMaxLength - numberLength - matchedNumberLength;
        }
    for (int i = 0; i < length ; i++)
        {
        number.Append(' ');
        }

    number.Append(aMatchedNumber);
    TRAP_IGNORE(SetTextL(number));

    }

void CDebugLogPrint::WriteToLog8L(const TDesC8 &aDes, const TDesC8 &aDes2)
	{
	TBuf16<256> buf;
	TInt pos=aDes.LocateReverse(' ');
	if (pos<0)
		pos=0;
	buf.Copy(aDes.Mid(pos));
	buf.Append(' ');
	TInt bufLen=buf.Length();
	TPtr16 ptr(&buf[bufLen],buf.MaxLength()-bufLen);
	ptr.Copy(aDes2);
	buf.SetLength(bufLen+aDes2.Length());
	_LIT(KDebugFormatString, "%S");
	RDebug::Print(KDebugFormatString, &buf);	
	}

EXPORT_C void CIpuTestHarness::GetAnEntry(const TDesC& ourPrompt, TDes& currentstring)
//
//	Get an input string from the user, displaying a supplied prompt and default string value
	{
	// If we're scripting, try reading from script first
	TInt readScriptErr = KErrNotFound;
	if (iScriptRunning)
		{
		readScriptErr = ReadLineFromScript(currentstring);
		}
	if (!readScriptErr)
		return;

	// Either not scripting, or hit end of script - continue with user input
	TBuf16<KMaxUserEntrySize> ourLine;
	TBuf<KMaxUserEntrySize> tempstring;				//tempstring is a unicode descriptor
										//create a temporary buffer where the
										//unicode strings are stored in order to 
										//be displayed
	ourLine.Zero ();
	tempstring.Copy(currentstring);		//Copy current string to Unicode buffer
	TKeyCode key = EKeyNull;						//current string buffer is 8 bits wide.
										//Unicode string bufffer (tempstring) is 16 bits wide.
	for (;;)
		{
		if (ourLine.Length () == 0)
			{
			iTest.Console()->SetPos (0, iTest.Console()->WhereY ());
			iTest.Console()->Printf (_L ("%S"), &ourPrompt);
			if (tempstring.Length () != 0)						//get tempstring's number of items
				iTest.Console()->Printf (_L (" = %S"), &tempstring);	//if not zero print them to iTest.Console()
			iTest.Console()->Printf (_L (" : "));
			iTest.Console()->ClearToEndOfLine ();
			}
		key = iTest.Getch();
		
		  if (key == EKeyBackspace)
				{
					if (ourLine.Length() !=0)
					{
						ourLine.SetLength(ourLine.Length()-1);
						iTest.Console()->Printf (_L ("%c"), key);
						iTest.Console()->SetPos(iTest.Console()->WhereX(),iTest.Console()->WhereY());
						iTest.Console()->ClearToEndOfLine();
					}	// end if (ourLine.Length() !=0)
				}	// end if (key == KeyBackSpace)
		  
		  		  
		  if (key == EKeyDelete) 			
				{
					ourLine.Zero();
					iTest.Console()->SetPos (0, iTest.Console()->WhereY ());
					iTest.Console()->ClearToEndOfLine ();
					tempstring.Copy(ourLine);
					break;
				}
		  
		  if (key == EKeyEnter)
			break;
		
		  if (key < 32)
			{
			continue;
			}
		
		ourLine.Append (key);
		iTest.Console()->Printf (_L ("%c"), key);
		iTest.Console()->SetPos(iTest.Console()->WhereX(),iTest.Console()->WhereY());
		iTest.Console()->ClearToEndOfLine();
		if (ourLine.Length () == ourLine.MaxLength ())
			break;
		}	// end of for statement

	if ((key == EKeyEnter) && (ourLine.Length () == 0))
		tempstring.Copy (currentstring);				//copy contents of 8 bit "ourLine" descriptor
	
	iTest.Console()->SetPos (0, iTest.Console()->WhereY ());		
	iTest.Console()->ClearToEndOfLine ();
	iTest.Console()->Printf (_L ("%S"), &ourPrompt);
	
	if ((key == EKeyEnter) && (ourLine.Length() !=0))
		tempstring.Copy(ourLine);
	if (tempstring.Length () != 0)						//if temstring length is not zero
		{
		iTest.Console()->Printf (_L (" = %S\n"), &tempstring);	//print the contents to iTest.Console()
		LogIt(_L ("%S = %S\n"), &ourPrompt, &tempstring);
		}

	else
		//iTest.Console()->Printf (_L (" is empty"));
	iTest.Console()->Printf (_L ("\n"));
	currentstring.Copy(tempstring);						//copy 16 bit tempstring descriptor back 
	}