Thread: Dynamically changing an icon

How do I dynamically change an applications icon with only the window's handle. I've tried the following:

Code:

LoadIcon(NULL, MAKEINTRESOURCE(IDI_ICON1));
SetClassLong(hwnd, GCL_HICON, hIcon);

but I get this error:

SetClassLongA' : cannot convert parameter 3 from 'struct HICON__ *' to 'long'

nope, that just doesn't do anything

This code works for me:

Code:

SetClassLong(MainWindow, GCL_HICON, (LONG)LoadIcon(CurInst, MAKEINTRESOURCE(ProgramIcon)));
ShowWindow(MainWindow, SW_HIDE);
ShowWindow(MainWindow, SW_SHOW);

(You have to hide then show the window again, or the icon will be misplaced, appearing inside the window caption)

I noticed that, when you load the icon, you don't handle the return-value from LoadIcon. Is this a typo?