Beginner: sharing information between classes

How about having one function in the CW1Dlg which returns you the address of lastTime. Then you send that address to the other class which then can use that address. Only a few changes have to be made (ie, pointers and references), but you can do that on your own.

Use the "friend" keyword to let the CW1Dlg class and the other class communicate.
Alternatively you could make lastTime global, it will work, but normally I try to avoid this...

Declare one more member function in CW1Dlg class as
public:
CTimeSpan GetLastTime();
void SetLastTime(CTimeSpan cTime);

then define as given below

CTimeSpan CW1Dlg::GetLastTime()
{
      return lastTime;
}
void CW1Dlg::SetLastTime(CTimeSpan cTime )
{
      lastTime = cTime;
}

To get/read the Last time use

CW1Dlg cW1DlgTemp;
CTimeSpan dtTempTime = cW1DlgTemp.GetLastTime();

To Set/Update the Last time use

CTimeSpan MinutesX15 = CTimeSpan(0,0,1,0);
CTimeSpan Minutesmin15 = CTimeSpan(0,0,15,0);

CTimeSpan dtTempTime = cW1DlgTemp.GetLastTime();

dtTempTime -= Minutesmin15;

cW1DlgTemp.SetLastTime(dtTempTime);

Try this
All the Best
-Vasudev

 

thanks for the many solutions i like  abdij´s proposal most . How is "friend" working ? Can you give little example ?

Just a thought: Friend is a bad programming practice when trying to program in an object-oriented language, that should be avoided.  Providing a getTime and setTime method is the best way to go about it to maintain code that's easy to use and maintain.

Laminamia :)

Adjusted points from 50 to 70

"Have a static member variable in CW1Dlg say m_stcTime and 2 member functions CW1Dlg::SetTime(..) and CW1Dlg::GetTime(..) "

could you write down an example please. I come from Java. Beginner there too and i really dont understand the syntax of those ::

i am adjusting the points for some extra lesson if you dont mind ?
thanks...

If you have a class with all kinds of functions in it. You have to somehow fill in the functions (what they should do), thus you write out the functions like

void GetTime(void)
{
   ...
}

but how will the compiler know that it belongs to that certain class? It knows by using the double :
First you write the returntype, then the class and then you write the function name.

CJ

Hi Peter,

Could u pl. explain more on the context of usage of your variable 'lastTime'. Because the implementation depends upon the life time of the object and the security of data.
1. If the variable is used to store the Last time of any object of CW1Dlg then you can make use of getTime() and setTime(). But if each object of the class has its own lastdate (usaully)storage then the static usage will be wrong.
2. The usage the friend function almost voilates the O.O.Concept. Before using friend function think twise whether that context suggests that?. (i am worried about the security of lastTime)

Ans1:
if you need only static variable m_stcTime you need not have to have member function to use it. U can
1) Get the Last Date by  
CTimeSpan dtTempTime  = CW1Dlg::m_stcTime and
2) Set the Last Date by  CW1Dlg::m_stcTime = dtTempTime  and

Ans2:
if you need static variable and 2 static member functions then,

Example:
Declare members in CW1Dlg class as
public:
static m_stcTime;
static CTimeSpan GetLastTime();
static void SetLastTime(CTimeSpan cTime);

rest of the  code remains same as commented lasttime.

Try this out
bye
-Vasudev