Creating a S60 UI to an existing Open C component

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Article

Created: ebra (13 Jun 2007)

Last edited: hamishwillee (16 Dec 2011)

Introduction

This article discusses how to create and what kind of options there are when creating a S60 user interface to an existing Open C component. Two ported desktop console applications Potrace and MkBitmap are used as an example.Porting a desktop console application Potrace to S60 using Open C

Creating application skeleton

The easiest way to start creating the UI is using the application wizard which comes with Carbide.C++. This example evaluates to usage of the free Carbide.C++ version 1.2 Express.

The type of the application is S60 3rd Ed. GUI Application

The Application UID 0xA0002AD9 has been requested from Symbian http://licensing.symbian.org/. The tool gives a warning because a real UID is used instead of a test UID.

The directory structure for the application

Adding interface to Open C component

The application wizard basically creates a copy the HelloWorldBasic application. The class names and UID are the only different things.

Original function

// -----------------------------------------------------------------------------
// COpenCUIExampleAppUi::HandleCommandL()
// Takes care of command handling.
// -----------------------------------------------------------------------------
//
void COpenCUIExampleAppUi::HandleCommandL( TInt aCommand )
	{
	switch( aCommand )
		{
		case EEikCmdExit:
		case EAknSoftkeyExit:
			Exit();
			break;
 
		case ECommand1:
			{
 
			// Load a string from the resource file and display it
			HBufC* textResource = StringLoader::LoadLC( R_COMMAND1_TEXT );
			CAknInformationNote* informationNote;
 
			informationNote = new ( ELeave ) CAknInformationNote;
 
			// Show the information Note with
			// textResource loaded with StringLoader.
			informationNote->ExecuteLD( *textResource );
 
			// Pop HBuf from CleanUpStack and Destroy it.
			CleanupStack::PopAndDestroy( textResource );
			}
			break;
		case ECommand2:
			{
 
			RFs fsSession;
			RFile rFile;
 
			// Connects a client process to the fileserver
			User::LeaveIfError(fsSession.Connect());
			CleanupClosePushL(fsSession);
 
			//Open file where the stream text is
			User::LeaveIfError(rFile.Open(fsSession,KFileName, EFileStreamText));//EFileShareReadersOnly));// EFileStreamText));
			CleanupClosePushL(rFile);
 
			// copy stream from file to RFileStream object
			RFileReadStream inputFileStream(rFile);
			CleanupClosePushL(inputFileStream);
 
			// HBufC descriptor is created from the RFileStream object.
			HBufC* fileData = HBufC::NewLC(inputFileStream, 32);
 
			CAknInformationNote* informationNote;
 
			informationNote = new ( ELeave ) CAknInformationNote;
			// Show the information Note
			informationNote->ExecuteLD( *fileData);			
 
			// Pop loaded resources from the cleanup stack
			CleanupStack::PopAndDestroy(4); // filedata, inputFileStream, rFile, fsSession
			fsSession.Close();
			}
			break;
		case EHelp:
			{
 
			CArrayFix<TCoeHelpContext>* buf = CCoeAppUi::AppHelpContextL();
			HlpLauncher::LaunchHelpApplicationL(iEikonEnv->WsSession(), buf);
			}
			break;
		case EAbout:
			{
 
			CAknMessageQueryDialog* dlg = new (ELeave)CAknMessageQueryDialog(); 
			dlg->PrepareLC(R_ABOUT_QUERY_DIALOG);
			HBufC* title = iEikonEnv->AllocReadResourceLC(R_ABOUT_DIALOG_TITLE);
			dlg->QueryHeading()->SetTextL(*title);
			CleanupStack::PopAndDestroy(); //title
			HBufC* msg = iEikonEnv->AllocReadResourceLC(R_ABOUT_DIALOG_TEXT);
			dlg->SetMessageTextL(*msg);
			CleanupStack::PopAndDestroy(); //msg
			dlg->RunLD(); 
			}
			break;
		default:
			Panic( EOpenCUIExampleUi );
			break;
		}
	}