dynamically set the IDR_MAINFRAME icon

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Does anyone know how to set the program icon dynamically in a VC6 doc-view application? The icon in the upper left of the title bar is the 16x16 IDR_MAINFRAME icon, and the icon shown for the executable on the desktop is the 32x32 IDR_MAINFRAME icon. Also any file shown on the desktop opened with that program will have the icon displayed with that file. I have an application where I want to let the user select an icon, then I want to show that icon in the upper left of the title bar, and also set the icon associated with any generated files on the desktop to the selected icon. So it sounds like dynamically changing the IDR_MAINFRAME icon to another icon would have the behavior I'm trying to implement. I have all the icons the user can select in my resource (IDI_ICON1, IDI_ICON2, etc). Thanks.

Posted 10-Jun-11 5:16am

genush

Updated 10-Jun-11 6:51am

v2

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strogg · Answer 1 · 2011-06-12T08:14:00

You're asking 3 different things

I'll explain how to change the application window's icon.
(I'm not used to working with MFC, so i'll use some API)

Load the icon from your resource using

HICON icn = ::LoadIcon(::GetModuleHandle(NULL),MAKEINTRESOURCE(IDI_ICONx))

You may set the icon using SetClassLong

::SetClassLong(hWnd,GCL_HICON,(LONG)icn);

You must use the Shell Links api to set your desktop shortcut's icon. Check msdn for some examples

To set your application's documents' icons, modify the registry
(assuming your document's extension is .abc)
Set icons in this path
HKEY_CLASSES_ROOT\.abc\DefaultIcon
The value will be the path to your executable file, followed by a number
Eg: C:\YourApp.exe,0
where the number 0 (or 1,2) is the order number of the icon resources in your executable.
Just check out some registry keys to understand