c++ - How to set the Windows taskbar icon during runtime?

Question

normally the icon that belongs to a application's taskbar-button is the same icon that is contained in the EXE and shown for the program. Now within my application I want to change this icon dynamically, means a configuration is read where a (PNG) image is specified. Now the application loads this image and has to set it as new taskbar icon.

But: how can this last step be done? How do I set the icon in taskbar (not in tray!) during runtime?

Thanks!

Answer 1

Send a WM_SETICON message to your window, passing the size (either ICON_BIG or ICON_SMALL) in the wParam and the handle to the new icon in the lParam.

SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)hIcon);