[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
?
Solved

Visual Basic "DoEvents" C++ equivalent...

Posted on 2000-04-15
9
Medium Priority
?
2,633 Views
Last Modified: 2013-11-25
Hi...

In the Visual Basic, have the
"Doevents" command...

What the equivalent in C++ ?

thanks...
0
Comment
Question by:masvmasv
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
9 Comments
 
LVL 1

Expert Comment

by:Toad224
ID: 2719421
while(action)
{
}
0
 

Author Comment

by:masvmasv
ID: 2719472
Thanks man...

Looking my code:

   for x = 1 to 10
       doevents
   next

in Borland C++ Builder:

   for( int x = 1; x <= 10; x++ )
        Application->ProcessMessages();

and in C/C++ (Visual C++) ?

Thanks
0
 
LVL 7

Expert Comment

by:KangaRoo
ID: 2719486
There is no real equivalent to that in C++. There may be equivalents in specific frameworks, like masvmasv showed for BC Builder, or others for, lets say, MFC or OWL.
It would be usefull if you specified which frameworks you are using.
0
Get your Disaster Recovery as a Service basics

Disaster Recovery as a Service is one go-to solution that revolutionizes DR planning. Implementing DRaaS could be an efficient process, easily accessible to non-DR experts. Learn about monitoring, testing, executing failovers and failbacks to ensure a "healthy" DR environment.

 

Author Comment

by:masvmasv
ID: 2719522
ok...

thanks

But if I have a infinit loop:

   while( true )
   {
   }

crash Windows ?
0
 

Expert Comment

by:nimrodh
ID: 2720178
if you are using multithreading, you can use the SleepEx function.
The SleepEx function causes the current thread to enter a wait state until one of the following occurs:
An I/O completion callback function is called.
An asynchronous procedure call (APC) is queued to the thread.
The time-out interval elapses.
0
 

Author Comment

by:masvmasv
ID: 2720450
Do you dont understand...

I need force Windows execute events, if I have a infinite loop...

thanks
0
 
LVL 32

Expert Comment

by:jhance
ID: 2720841
There is no equivalent to the VB DoEvents call in VC++.  So you need to do it some other way.

No window in your application will process any Windows messages while your application is busy processing in a long running or infinite loop.  The best course of action is to code you app so that there are no long procedures in the main app's thread.  Any long or "forever" loops should be coded in a separate thread.  That way, Windows messages will still be processed even though your function is running for a long time.

If you cannot do it this way, a possible work around is to interrupt your loop periodically, setup a timer to signal you to restart the loop, and save some status information to permit you to restart the loop where you left off.  Then you can return to Windows.  When the timer fires, you can pick up where you left off for a specified time interval.
0
 

Accepted Solution

by:
zealsoft earned 150 total points
ID: 2721276
Use following function.

BOOL DoEvents()
{
        MSG msg;
       
        while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){
                if(msg.message==WM_QUIT)
                        return FALSE;
                TranslateMessage(&msg);
                DispatchMessage(&msg);
        }
        return TRUE;
}
0
 

Author Comment

by:masvmasv
ID: 2735521
Thanks...
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

649 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question