Data member passing

Hi there,

Could somebody please guide me with the procedure to pass the value of:

a) A data member, defined in one class, into another class
b) A data member, defined in a function of a class, into another function of the same class

Would gr8ly appreciate advise here.

Best,
wirefree101

I would say that depends on about a zillion different things. What exactly are you trying to achieve here? have you got an example of why you want to pass data around like that?

Most commonly, passing individual data members around from one class to another is a symptom of bad design (Not always, but alot can start to go wrong when a member function begins directly reading & modifying members of a different class)

There's almost certainly an alternative approach - if you give us details of what you're trying to do, someone may be able to suggest something.

>A data member, defined in one class, into another class

Interherence. You can define a data member as protected in a form of a 'base' class and use it in another class.

Interherence.

Err... do you mean "inheritance"?

Yes, sorry it was late when i typed that and I didnt notice.

Appreciate the responses.

Following are the specifics:

- IDE generates 5 errors related, essentially, with the non-transferability/usage of:

a) ‘bLocStr’ (defined in WrUAppUi.cpp) being referred to in MTMSExampleEngine.cpp.

defined here...

Code:

File: WrUAppUi.cpp

CWrUAppUi::HandleSessionEventL(TMsvSessionEvent aEvent, TAny* aArg1, TAny* aArg2, TAny* /*aArg3*/)
    {
    switch (aEvent)
...
...
TBuf16<128> bLocStr;
...

used here...

Code:

File: CMtmsExampleEngine.cpp

void CMtmsExampleEngine::CreateDraftSMSL(const TDesC& aAddress)
    {
...
...
body.InsertL(0, bLocStr);
...

b) ‘address’ (defined, & used, earlier in the same class) being referred to in HandleSessionEventL() of WrUAppUi.cpp

defined here...

Code:

File: WrUAppUi.cpp

void CWrUAppUi::HandleCommandL(TInt aCommand)
    {
...
...
TBuf<30> address;
GetNumber(address);
iEngine->CreateDraftSMSL(address);
...

used here...

Code:

File: WrUAppUi.cpp

void CWrUAppUi::HandleSessionEventL(TMsvSessionEvent aEvent, TAny* aArg1, TAny* aArg2, TAny* /*aArg3*/)
    {
    switch (aEvent)
...
...
iEngine->CreateDraftNewSMSL(address);
...

Would appreciate a prompt response.


Best,
wirefree101

You cannot access local variables of one (member) function in another function.
Make them class members or pass them as parameters.
Kurt

Thx for the response.

Issue (b) has resolved by declaring 'address' as 'public' in WrUAppUi.h.

However, with reference to issue (a) above, can you please advise me on how to pass value to other classes and use them there. (Note: TBuf16<128> bLocStr is defined in WruAppUi.cpp & assigned a value there. Now it needs to be used in CMtmsExampleEngine.cpp)

Thx in advance,
wirefree101