Why I am not able to refresh dialog box with WM_NCPAINT, but working fine with WM_SIZE?

Question

0.00/5 (No votes)

See more:

I am having dialog box application in MFC. To refresh view on dialog box we are using WM_NCPAINT, it does call OnNCPaint, but sometimes view is not getting refreshed. Behaviour is not always reproducible. Same behaviour is happening with WM_PAINT also.

When we use SendMessage(WM_SIZE), behaviour is not reproducible, and working as expected.

Before checking in the code, I wanted to make sure, should I use WM_SIZE instead of WM_NCPAINT or WM_PAINT, because it is working fine with it.

Posted 13-Jan-15 1:06am

kpranit

Add a Solution

Comments

Kornfeld Eliyahu Peter 13-Jan-15 7:18am

WM_NCPAINT is for painting the none-client (NC!) part of the window (means frame) so it is different from WM_PAINT...
I should advise to check your code...

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Answer 1 · 2015-01-13T01:47:00

Solution 1

From the WM_PAINT[^] MSDN page:

Quote:
The WM_PAINT message is generated by the system and should not be sent by an application

To update or redraw a window use the UpdateWindow[^] and RedrawWindow[^] functions.

Posted 13-Jan-15 1:47am

Jochen Arndt