Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

MFC,C++: Updating a view without calling its documents UpdateAllViews

Posted on 2007-12-05
4
Medium Priority
?
1,070 Views
Last Modified: 2013-12-14
I would like to update an MFC view when it is about to be displayed. I can only do this though a generic CView pointer, so the only functions of my own I can call are overloaded functions. I essentially want to call OnUpdate(), but cannot, as it is private. Only the framework may call OnUpdate(). That being the case, how can I update a single view, without calling my document's UpdateAllViews()?

Regards,
Sternocera
0
Comment
Question by:sternocera
  • 2
  • 2
4 Comments
 
LVL 45

Expert Comment

by:AndyAinscow
ID: 20411306
Two ways.
Use the UpdateAllViews and use lHint / pHint to stop views being pdated that you don't want updating.
Or in the OnUpdate call a public function eg. UpdateThisView, then for just updating one view call this directly pView->UpdateThisView();
0
 

Author Comment

by:sternocera
ID: 20411372
Andy,

I cannot know in advance exactly what sort of object my generic CView* will point to, which is why it is just a generic CView* , so I can't call anything that is not a CView member function. A bunch of views exist on the heap, and my generic CView* points to the currently viewed one.

I guess that just leaves the Hint method.

0
 
LVL 45

Accepted Solution

by:
AndyAinscow earned 2000 total points
ID: 20411460
Nope - you can use a custom message eg WM_APP+123.  Pass it to the view in a SendMessage (or PostMessage) and it will be handled if the view knows how to respond to that message else it will end up in the great bit bucket in the bowels of windows.
0
 

Author Comment

by:sternocera
ID: 20411549
You're right - I should just send a custom message to have the view update,

very colourful analogy :-)

Thanks
0

Featured Post

Get free NFR key for Veeam Availability Suite 9.5

Veeam is happy to provide a free NFR license (1 year, 2 sockets) to all certified IT Pros. The license allows for the non-production use of Veeam Availability Suite v9.5 in your home lab, without any feature limitations. It works for both VMware and Hyper-V environments

Question has a verified solution.

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

Entering time in Microsoft Access can be difficult. An input mask often bothers users more than helping them and won't catch all typing errors. This article shows how to create a textbox for 24-hour time input with full validation politely catching …
Ready to get certified? Check out some courses that help you prepare for third-party exams.
The viewer will learn how to use and create keystrokes in Netbeans IDE 8.0 for Windows.
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

581 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