Solved

UpdateAllViews - OnDraw Lags

Posted on 2006-11-02
1
304 Views
Last Modified: 2013-11-20
Hi Experts,

Developing an application for grabbing data off a bus and displaying it (similiar to Ethereal but for a different protocol). Have the code below in my Doc class. The problem is when I do an updateallviews - my OnDraw() function is putting up a lot of text up on the screen (using a BitMap to avoid flicker) but theres tons of data coming in on the bus and the delay from the time I receive the data to the time it gets drawn on the screen is a few seconds.

Is there an obvious reason why the lag/delay is occuring - is there a simple solution to speed up the time from when I receive data to get it drawn up on the screen?

void MyDoc::OnCommandStop()
{
     stop_recv_flag = 1;
}

void MyDoc::DoEvents()
{  
     MSG msg;  
     while ( ::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE ) )
     {  
          ::TranslateMessage(&msg);
          ::DispatchMessage(&msg);
     }
}

void MyDoc::OnCommandRun()
{
     while(!stop_recv_flag)
     {
          status = read_bus (data);
          if (status == GOTDATA)
          {
               UpdateAllViews(NULL);    
          }  
          DoEvents();              
     }

     stop_recv_flag = 0;
}

Thanks!
0
Comment
Question by:DizZzM
1 Comment
 
LVL 22

Accepted Solution

by:
mahesh1402 earned 500 total points
ID: 17864301
May be you can have a worker thread to receive / read bus data and from your thread function you may send message to your main application to update other views / information to display..

-MAHESH
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
format the code in java 6 93
withoutTen challenge 14 120
Thin secure Windows 10 5 95
Trying to run powershell  in a batch file. How do I do this? 8 90
Introduction: Finishing the grid – keyboard support for arrow keys to manoeuvre, entering the numbers.  The PreTranslateMessage function is to be used to intercept and respond to keyboard events. Continuing from the fourth article about sudoku. …
Introduction: Hints for the grid button.  Nested classes, templated collections.  Squash that darned bug! Continuing from the sixth article about sudoku.   Open the project in visual studio. First we will finish with the SUD_SETVALUE messa…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

776 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