Solved

Changing the application icon on the fly

Posted on 2002-07-22
7
398 Views
Last Modified: 2008-02-01
I'm writing a simple SDI MFC application. The application is loading in the InitApplication (loading IDR_MAINFRAME by default) when registering the window class. I would like to change that icon later in the execution because I don't have it at that time. Later, in the InitInstance(), I load a resource DLL and then I would be ready to change the icon of my application.

How can I change the icon of my application after the InitApplication()?
0
Comment
Question by:mahtieubrault
[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
  • 3
  • 2
  • 2
7 Comments
 
LVL 9

Expert Comment

by:BeyondWu
ID: 7170859
HICON hNewIcon = LoadIcon(...);
::SetClassLong(m_hYourWnd, GCL_HICON, (LONG)hNewIcon);
0
 
LVL 8

Expert Comment

by:fl0yd
ID: 7171552
Since you are using MFC you could also use:

AfxGetMainWnd()->SetIcon( ::LoadIcon(...), FALSE );
0
 

Author Comment

by:mahtieubrault
ID: 7171713
Thanks guys but there is one last thing. The icon I use has a lot of formats (16x16,32x32,48x48,64x64). If I put the icon as the regular MyApp.ico in the res directory, the icon is displayed fine (the 16x16 version in the taskbar). But if I use one of your calls, it seems like it uses a bigger icon and shrinks it. That looks ugly.

I tried
AfxGetMainWnd()->SetIcon( ::LoadIcon(...), FALSE )
AfxGetMainWnd()->SetIcon( ::LoadIcon(...), TRUE )
but it doesn't change anything.

btw, it workd fine for a SDI app, the icon glitch is only with my dialog-based application.
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 9

Expert Comment

by:BeyondWu
ID: 7173182
Make another call,
::SetClassLong(m_hYourWnd, GCL_HICONSM, (LONG)hNewIcon);
0
 

Author Comment

by:mahtieubrault
ID: 7174123
Doing the two calls with SetIcon (big and small) or the two calls with SetClassLong (big and small) don't change anything. The application icon in the taskbar is still blurry like it was srunk from another format that 16x16. In my SDI application it works fine!
0
 
LVL 8

Accepted Solution

by:
fl0yd earned 200 total points
ID: 7174236
I guess I found a solution: Use ::LoadImage(...) instead of ::LoadIcon(...). With ::LoadImage(...) you can specified the desired width and height of the icon to load. You can find further information here:
http://search.microsoft.com/gomsuri.asp?n=4&c=rp_Results&siteid=us/dev&target=http://msdn.microsoft.com/library/en-us/winui/winui/windowsuserinterface/resources/introductiontoresources/resourcereference/resourcefunctions/loadimage.asp
0
 

Author Comment

by:mahtieubrault
ID: 7174293
Thanks it works good. I have to do one LoadImage (16x16) for the icon in the taskbar and one LoadImage (32x32) for when I do ALT-Tab.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Introduction This article is the first in a series of articles about the C/C++ Visual Studio Express debugger.  It provides a quick start guide in using the debugger. Part 2 focuses on additional topics in breakpoints.  Lastly, Part 3 focuses on th…
What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

695 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