Windows 7 - Taskbar - Pin or Unpin Program Links

Question

As in title, is there any Win32 API to do that?

Answer 1

It works, but not for all OS, e.g. Windows 10:

    [DllImport("kernel32.dll")]
    private static extern IntPtr LoadLibrary(string dllName);
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern int LoadString(IntPtr hInstance, uint uID, StringBuilder lpBuffer, int nBufferMax);

    private static void PinUnpinTaskBar(string filePath, bool pin)
    {
        if (!File.Exists(filePath))
            throw new FileNotFoundException(filePath + " not exists!");

        int MAX_PATH = 255;
        var actionIndex = pin ? 5386 : 5387; // 5386 is the DLL index for"Pin to Tas&kbar", ref. http://www.win7dll.info/shell32_dll.html
        StringBuilder szPinToStartLocalized = new StringBuilder(MAX_PATH);
        IntPtr hShell32 = LoadLibrary("Shell32.dll");
        LoadString(hShell32, (uint)actionIndex, szPinToStartLocalized, MAX_PATH);
        string localizedVerb = szPinToStartLocalized.ToString();

        // create the shell application object
        dynamic shellApplication = Activator.CreateInstance(Type.GetTypeFromProgID("Shell.Application"));

        string path = Path.GetDirectoryName(filePath);
        string fileName = Path.GetFileName(filePath);

        dynamic directory = shellApplication.NameSpace(path);
        dynamic link = directory.ParseName(fileName);

        dynamic verbs = link.Verbs();
        for (int i = 0; i < verbs.Count(); i++)
        {
            dynamic verb = verbs.Item(i);

            if ((pin && verb.Name.Equals(localizedVerb)) || (!pin && verb.Name.Contains(localizedVerb)))
            {
                verb.DoIt();
                break;
            }
        }
    }

Answer 2

Don't do this.

I'm 99% sure there isn't an official API for it, for exactly the same reason that there wasn't programmatic access to the old Start Menu's pin list.

In short, most users don't want programs putting junk in their favorites, quick launch, taskbar, etc. so Windows doesn't support you doing as such.