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...
Main Topics
Browse All Topics
Loading Advertisement...
Question
Beginner: sharing information between classes
win32, Visual C++6 , beginner (i mean real beginner :)
Sorry for this question but i really dont know. I am getting the time in one class and i am trying to access it in another class. But how do i do that ?
void CW1Dlg::SetData(float* newnndata, float* newppdata)
{
chart3.SetData(newnndata);
chart2.SetData(newppdata);
CTime lastTime;
lastTime = CTime::GetCurrentTime();
}
now i would like to access lastTime elsewhere. For example in another class
CTimeSpan MinutesX15 = CTimeSpan(0,0,1,0);
CString display_time;
CTimeSpan Minutesmin15 = CTimeSpan(0,0,15,0);
lastTime -= Minutesmin15;
like this.
Can you give me some tips with sharing information in a program. I know its really basic but it would help me understand.
thanks...
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Subscribe now for full access to Experts Exchange and get
Instant Access to this Solution
- Plus...
- 30 Day FREE access, no risk, no obligation
- Collaborate with the world's top tech experts
- Unlimited access to our exclusive solution database
- Never be left without tech help again
Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.
- "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
- "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
- "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.
See what Experts Exchange can do for you.
Got a question?
We've got the answer.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
Need individual assistance?
Our experts are ready to help.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Want to learn from the best?
Read articles from industry experts.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Working on a long term project?
Store your work and research.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
What Makes Experts Exchange Unique?
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Trusted by the world's most respected brands.
Faithfully serving IT professionals since 1996.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Free Tech Articles
-
WARNING: 5 Reasons why you should NEVER fix a computer for free.
It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
-
SCCM OSD Basic troubleshooting
SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
-
Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
-
Create a Win7 Gadget
This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
-
Outlook continually prompting for username and password
There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
-
Backup Exchange 2010 Information Store using Windows Backup
There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...
Cloud Class Webinars
- Avoiding Bugs in Microsoft Access
Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
- Top 10 Best New Features in Visio 2010
Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
- IT Consultant Business Secrets Revealed
Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
- Disaster Recovery and Business Continuity
Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
- Organize Your Visio Diagrams with Containers and Lists
Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
- How to Us Objects, Properties, Events and Methods in Microsoft Access
Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...
Join the Community
Give a Little. Get a Lot.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
Answers
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(CTimeS
{
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(dtT
Try this
All the Best
-Vasudev
Hi,
Vasu: Ur solution may work but is not exactly the right way to implement.
I think forza is right. Since peter has 2 different classes it is better to go by the "friend" approach. His alternate approach though should be avoided.
Another alternative: again not the best but easy is:
Have a static member variable in CW1Dlg say m_stcTime and 2 member functions CW1Dlg::SetTime(..) and CW1Dlg::GetTime(..)
..
To set time call SetTime() and to get it anywhere call GetTime.
The limitation is that only one time can exist at any time. For example if there is a CW1Dlg dlg1 and dlg2, and both try to do set get the time the whole thing will definately be a mess. It is good if and only if one and only one instance of CW1Dlg class exists.
Hope this helps,
All the best,
bye
BYW: Is ch_vasu from Kshema Tech, Blr????
Bye
Abdij
"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
3 Ways to Join
Business Accounts
- Perfect for organizations
- Multiple users
- Save over 36%
- Create a Business Account
Answer for Membership
- Earn free access
- Showcase your knowledge
- No credit card required
- Sign Up to Answer
Loading Advertisement...
by: CJ_SPosted on 2000-05-05 at 01:22:14ID: 2779883
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.