examples/SysLibs/ResourceFiles/ReadData/ReadData.cpp

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Description:
This example shows how to load data from resource files
into a class.
It loads the resource identified as resource FIRST from the resource
file. This is a simple resource of type DATA.
The example constructs a CResData object to hold the 
individual items corresponding to the items in a 
DATA struct.
The CResData object can also display the individual
items at the test console. All WORD, BYTE and LONG
are interpreted as signed values  
*/




        
#include "CommonToResourceFilesEx.h"

#include "ReadData.h"
#include <readdata.rsg>

                                // Construct a new CResData object and place 
                                // on the cleanup stack
CResData* CResData::NewLC(TResourceReader& aReader)
        {
        CResData* self=new (ELeave) CResData;
        CleanupStack::PushL(self);
        self->ConstructL(aReader);
        return self;
        }


                                // Complete the construction of the 
                                // CResData object using the supplied
                                // reource reader representing the resource data.
                                // The structure of the data is assumed to be
                                // defined by the resource struct DATA in "ReadData.rh"
void CResData::ConstructL(TResourceReader& aReader)
        {
                                // Interpret next bytes as a TInt16
        iWrd   = aReader.ReadInt16();
                        
                                // Interpret next bytes as a TInt16
        iFlags = aReader.ReadInt16();
                                        
                                // Interpret next bytes as a TInt32
        iLng   = aReader.ReadInt32();

        iTxt    = aReader.ReadTPtrC();
                                // Interpret the next byte as the length
                                // of text. The text itself follows
                                // this byte.
        iLtxt  = aReader.ReadHBufC16L(); 
                                // Interpret the next byte as a TInt8
        iByt   = aReader.ReadInt8();
        
                                // Interpret next bytes as a TReal
        iDbl   = aReader.ReadReal64();
                        
        }


                                // Destructor needs to ensure that 
                                // the HBufC descriptor iLtxt is destroyed.
CResData::~CResData()
        {
        if (iLtxt)
                delete iLtxt;
        }


                                // Show the individual resource itens
                                // at the test console.
void CResData::ShowData(const TInt aStructNum)
        {
        _LIT(KResourceItems,"Resource items (struct #%d):\n");
        _LIT(KResourceItems2,"Resource items:\n");
        _LIT(KWrdFormat,"wrd   = %d\n");
        _LIT(KFlags,"flags = ");
        _LIT(KEFlagItem,"EFlagItem");
        _LIT(KNewline,"\n");
        _LIT(KLngFormat,"lng   = %d\n");
        _LIT(KBytFormat,"byt   = %d\n");
        _LIT(KDblFormat,"dbl   = %S\n");
        _LIT(KTxtFormat,"txt   = %S\n");
        _LIT(KLtxtFormat,"ltxt  = %S\n");

        TBuf<16>        temp;
        TRealFormat     format(16,2);

        if (aStructNum)
                console->Printf(KResourceItems,
                                                   aStructNum
                                                  );
        else 
                console->Printf(KResourceItems2);

                                //  * * * * * * * * *
        console->Printf(KWrdFormat,iWrd);

                                //  * * * * * * * * *
                _LIT(KLtxt,"ltxt  = \n");
        console->Printf(KFlags);
        TUint           mask = 1;
        TBuf<256>       temp2;
        for (TInt ii = 0 ; ii < 16; ii++)
                {
                if (iFlags & mask)
                        {
                        temp2.Append(KEFlagItem);
                        temp2.AppendNum(ii+1);
                        temp2.Append('+');    
                        }
                mask <<= 1;
                }
        if (temp2.Length())
                temp2.SetLength(temp2.Length()-1);
        console->Printf(temp2);
        console->Printf(KNewline);
                
                                //  * * * * * * * * *
        console->Printf(KLngFormat,iLng);
                                //  * * * * * * * * *
        console->Printf(KTxtFormat,&iTxt);

                                //  * * * * * * * * *   
        if (iLtxt)
                console->Printf(KLtxtFormat,iLtxt);
        else
            console->Printf(KLtxt);
                                //  * * * * * * * * *
        console->Printf(KBytFormat,iByt);

                                //  * * * * * * * * *
        temp.Num(iDbl,format);
        console->Printf(KDblFormat,&temp);
                                
        }

// Do the example(s)

LOCAL_C void doExampleL()
    {
                // Declare a resource file
        RResourceFile resourceFile;
        
                // open resource file on the emulator(__WINS__  is defined for the Windows emulator)
                //(leave if error)
        #if defined(__WINS__)
        _LIT(KZSystemDataRsc,"Z:\\Resource\\Apps\\ReadData.rsc");
        resourceFile.OpenL(fsSession, KZSystemDataRsc);
        #endif

                // open a resource file on the target phone
                // ( __EPOC32__ is defined for all target hardware platforms regardless of processor type/hardware architecture)
        #if defined(__EPOC32__)
        _LIT(KCSystemDataRsc,"Z:\\Resource\\Apps\\ReadData.rsc");
        resourceFile.OpenL(fsSession, KCSystemDataRsc);
        #endif
        
                // Read the first resource & construct a resource reader
        HBufC8* res = resourceFile.AllocReadLC(FIRST);

        TResourceReader theReader;
        theReader.SetBuffer(res);

                // construct a CResData object to contain
                // the simple resource of type DATA.
        CResData* resData = CResData::NewLC(theReader);

                // Can now remove resData from the cleanup stack
        CleanupStack::Pop();

                // finished with res
        CleanupStack::PopAndDestroy(); 

                // display data
        resData->ShowData();

                // destroy the CResData 
        delete resData;

                // finished with resource file, so close it.
        resourceFile.Close();
        }
         

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