Dynamically changing an icon

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

Code:

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

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but I get this error:

Quote:

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

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Have you tried to typecast the icon pointer to a long?

SetClassLong(hwnd, GCL_HICON, (long)hIcon);

nope, that just doesn't do anything

This code works for me:

Code:

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

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(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?