examples/Base/IPC/pubsub/publishspec.cpp

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/*
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Description: Demonstrates the speculative publishing pattern of a byte-array property  
*/



#include "publish.h"

LOCAL_D CConsoleBase* console;

void PublishL(RProperty& aProperty,TDes16& aBuf)
        {
        TInt bufLength = aBuf.Length();
        console->Printf(KTxtPublish);

        // Publish the property and handle the value returned appropriately
        // Ignore the KErrNotFound error
        TInt err = aProperty.Set(aBuf);
        switch(err)
                {
                // No error, property is defined
                case KErrNone:
                        {
                        // Print array elements
                        console->Printf(KTxtArray);
                        for(TInt ix = 0; ix < bufLength; ix++)
                                {
                                console->Printf(KTxtArrayElement,aBuf[ix]);
                                }
                        console->Printf(KTxtNewLine);
                        }
                        break;
                // Property is not defined, ignore this error
                case KErrNotFound:
                        {
                        console->Printf(KTxtNotFound);
                        }
                        break;
                // Leave if any other errors are returned
                default:
                        {
                        User::LeaveIfError(err);
                        }
                }
        }

void DoExampleL()
        {
        console->Printf(KTxtSpecPublish);

        RProperty myProperty;
        console->Printf(KTxtCreateHandle);
        // Create a handle to the property
        User::LeaveIfError(myProperty.Attach(KMyPropertyCat,KMyPropertyName,EOwnerThread));

        // Byte-Array to be published
        TUint16 array[KArraySize] = {10,20,30,40};

        // Descriptor that the array contents are copied into
        TBuf16<KBufSize> buf;

        // Copy array contents into the descriptor
        buf.Copy(&array[0],sizeof(array));
        buf.SetLength(KArraySize);

        // Publish the property
        PublishL(myProperty,buf);

        // Change the array contents
        array[0] = 0x00ab;
        array[1] = 0x00bc;
        array[2] = 0x00cd;
        array[3] = 0x00de;
        array[4] = 0x00ef;
        array[5] = 0x00fa;

        // Copy array contents into the descriptor
        buf.Copy(&array[0],sizeof(array));
        buf.SetLength(KArraySize);
        console->Printf(KTxtEnter);

        // Wait for a key press
        while(console->Getch()!= EKeyEnter)
                {
                console->Printf(KTxtEnter);
                }

        // Publish the property
        PublishL(myProperty,buf);

        // Indicate the publisher will not publish any more values
        buf.Copy(KStop);
        console->Printf(KTxtEnter);

        // Wait for a key press
        while(console->Getch()!= EKeyEnter)
                {
                console->Printf(KTxtEnter);
                }

        // Publish the property
        PublishL(myProperty,buf);

        // Close the handle
        myProperty.Close();
        }

GLDEF_C TInt E32Main()
        {
        __UHEAP_MARK;
        CTrapCleanup* cleanup = CTrapCleanup::New();

        TRAPD(createError, console = Console::NewL(KTextConsoleTitle, TSize(KConsFullScreen,KConsFullScreen)));
        if (createError)
                return createError;

        TRAPD(mainError, DoExampleL());
        if (mainError)
                console->Printf(KTextFailed, mainError);
        console->Printf(KTextPressAnyKey);
        console->Getch();

        delete console;
        delete cleanup;
        __UHEAP_MARKEND;
        return KErrNone;
        }

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