Get Icon from other application.

HICON LoadIcon(
HINSTANCE hInstance, // handle to application instance
LPCTSTR lpIconName // icon-name string or icon resource
// identifier
);

Hi, I want to use LoadIcon function to get the icon from other application, I can provide the hInstance, but how can I know the icon's name?
Thank you!

How can taskmgr.exe retrieve those running application's icon?

Search the MSDN for ExtractIcon.

Quote:

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Get Icon from other application.
...LoadIcon(...)

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LoadIcon(...) worked good for your purpose in Win NT, but in 2000 you could get some problems using it.
The best way to "Get Icon from other application", as Marc G already wrote, is to use ExtractIcon (or ExtractIconEx if you want to get a small icon, not only large one).

Victor

Thank you very much! But I want to grab the window's handle on the fly and display it, just like that in taskmgr.exe. I hope you can give me more info and help! Best regards!

If you have a window handle, you can get the icon as follows:

Code:

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HICON hIcon = (HICON)::SendMessage(hwnd, WM_GETICON, ICON_BIG, 0);

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If you really want to get the EXE icon of the exe that created the window, you first need to get the exe from the hwnd as follows:

Code:

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        DWORD dwProcessID = 0;
        DWORD dwThreadID = GetWindowThreadProcessId(hWnd, &dwProcessID);
        TCHAR pszModuleFileName[MAX_PATH+1] = {0};
        HANDLE hProcessSnap = NULL;
        PROCESSENTRY32 pe32 = {0};

        //  Take a snapshot of all processes in the system.
        hProcessSnap = NuonSoftShellEnhancer::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);

        if (hProcessSnap == INVALID_HANDLE_VALUE)
                return;

        //  Fill in the size of the structure before using it.
        pe32.dwSize = sizeof(PROCESSENTRY32);

        //  Walk the snapshot of the processes, and for each process,
        //  display information.
        if (NuonSoftShellEnhancer::Process32First(hProcessSnap, &pe32))
        {
                do
                {
                        if (pe32.th32ProcessID == dwProcessID)
                        {
                                _tcscpy(pszModuleFileName, pe32.szExeFile);
                                break;
                        }
                }
                while (NuonSoftShellEnhancer::Process32Next(hProcessSnap, &pe32));
        }
        else
        {
                CloseHandle (hProcessSnap);
                return;    // could not walk the list of processes
        }

        // Do not forget to clean up the snapshot object.
        CloseHandle (hProcessSnap);

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Now pszModuleFileName should contain the module name that created the window.

But ::SendMessage(hWnd, WM_GETICON, ...) doesn't work with every window. I still wonder how can taskmgr.exe retrieve the correct icons from the open windows.

PROCESSENTRY32 + ExtractIconEx also not effective all the time, since one process can open multiple windows at the same time.
I really want to know how can Task Manager -- taskmgr.exe in windows 2000 -- list those icon correctly. Can somebody give me further help? Thanks!